视力保健研究网络 - 这项工作是由卫生研究所（178918），全宗德RECHERCHE连接桑特魁北克的加拿大学院资助。

注:雄性C57BL / 6小鼠（5-7周龄）从查尔斯河实验室国际公司（ST-恒，魁北克，加拿大），并根据批准的朱圣 - 海宁动物护理委员会的协议操作。小鼠支气管组织的外植体用于研究的LMP的上皮细胞上的促凋亡效应提供初级支气管上皮细胞的良好来源。这个协议描述了在体外产生的LMP的，以及用于检测对LMP的治疗支气管组织的外植体凋亡的上皮细胞的方法。该协议包括3个部分。 1.生产的LMP与表征注意:为防止污染，确保在这个实验中使用的所有材料是无菌的或高压灭菌。执行所有的步骤，在RT在生物安全柜无菌条件下，除非另有说明。 1.1）刺激和收集的国会议员9 <ol><li>解冻千万CEM T细胞等分在37℃水浴。稀释在10ml预热的无血清造血介质如X-VIVO，在15ml无菌管中并离心，在200 GX 5分钟。吸在5ml预热的培养基上清液和重悬细胞。 </li><li>转移细胞到T75组织培养瓶（对于悬浮细胞）用15ml预热的造血介质如X-VIVO并在湿润的培养箱中孵育4天，在37℃，5％的CO 2。 </li><li> 4天后，转移所有的培养基和细胞分化成含有100ml新鲜培养基一个T175组织培养瓶。继续孵育细胞在相同的条件下约72小时，直到它们长到200万个细胞/ ml的密度。 </li><li>均匀4 T175瓶中各含有150ml新鲜培养基，并继续培养细胞直到细胞已经生长（约48小时温育），以200万/ ml的密度之间分裂的细胞。 </li><li&gt;通过离心，在200×g离心收集从每个烧瓶中的细胞5分钟，并悬浮300×10 6细胞到含有150ml新鲜培养基的新T175烧瓶中，以维持2000000 / ml的细胞密度。 </li><li>加入放线菌素D（溶解在DMSO中，在2毫克/毫升）的培养基中以0.5微克/ ml的终浓度，并培育24小时。 </li><li>传送所有的培养基到50ml锥形管中，并降速细胞在750×g离心5分钟。转移上清液入50ml锥形管中并离心，在1500×g离心15分钟以除去大细胞碎片。 </li><li>转移上清液到250ml瓶中，超速离心机在12,000×g离心50分钟。弃去上清液，并收集颗粒。 </li><li>洗的LMP富集粒料用40ml无菌PBS在50ml管离心12000×g离心50分钟。重复此步骤两次。 </li><li>收集最后一次洗涤上清液;它将被用来作为载体对照。暂停的LMP颗粒1毫升的PBS并转移到1.5毫升无菌微型管。分装和储存孤立的LMP在-80°C（避免多重自由解冻周期）。 </li></ol>国会议员1.2），通过流式细胞仪分析4表征<ol><li>制备2个样品的膜联蛋白缓冲液中，用1和另一无CaCl 2:的Hepes的10mM，NaCl的140mM的，加或减5毫米氯化钙2。 </li><li>用0.22微米的过滤器以除去颗粒过滤膜联蛋白缓冲液和FACS流动鞘液。 </li><li>稀释1微升的LMP在44微升膜联蛋白缓冲液用5mM的CaCl 2成在FACS管中。准备另一管1微升的LMP中44微升膜联蛋白缓冲液无CaCl 2（阴性对照）。 </li><li>添加5微升annexinV-Cy5的在每个管拌匀。孵育在室温下15分钟，在黑暗中。停止反应稀释用400μl的FACS流动鞘液在每个管中混合。 </li><li>加入的7微米计BEA 10微升（200,000珠）DS悬浮在每个管内标，以获得绝对计数。 </li><li>建立相对大小门（FSC-H，PMT E00，对数刻度）和相对粒度（SSC-H，PMT 325，对数刻度）点图上用流式细胞仪的尺寸校准荧光珠流1微米（1号门）和算珠门7微米（2号门）。 </li><li>分析利用已建立的门和FL-4通道的膜联蛋白FSC-H / SSC-H情节的LMP样品（PMT 765，对数刻度）点图，通过收购一个信号，直到20000计数珠在2号门的到达。 </li><li>确定在含有氯化钙的膜联蛋白缓冲液的LMP的正annexinV事件，然后减去的LMP中的膜联蛋白缓冲液中的事件无CaCl 2（阴性对照）。 </li><li>计算根据下列方程式国会议员的绝对数量: <img alt="式（1）" fo:content-width="4in" src="/files/ftp_upload/52651/52651eq1.jpg" /></li></ol> 1.3）测定MP P的rotein浓度（Bradford法） <ol><li>制备从1.25至20微克/毫升的蛋白质标准的5系列稀释。吸移管800微升的每个标准和样品溶液注入一式两份一个干净的试管中。加入200μl布拉德福德染料试剂到每个管中。拌匀，然后在室温下孵育5分钟。 </li><li>测定吸光度在595nm处。确定的LMP使用标准曲线的线性回归中的蛋白质浓度。 </li></ol> 2.支气管组织植和治疗的LMP 注:要特别注意无菌的工作​​环境，无菌准备在下面的实验中使用的解决方案和媒介。准备完全愈合中，加入1毫升组织愈合中补充与血清（解冻冰）至100毫升组织愈合中拌匀。 2.1）准备支气管组织植<ol><li>培养之前，划伤1厘米2 6区每个在每100mm组织培养皿用手术刀叶片的表面的边缘。涂层的每个刮擦100mm组织培养皿用2ml培养皿涂布溶液，并孵化培养皿中的潮湿的 CO 2培养箱中O / N在37℃。真空吸出多余的解决方案，填补了菜用15毫升组织清洗介质。 </li><li>根据批准的动物护理伦理委员会的协议由CO安乐死C57BL / 6小鼠（5〜7周龄）2吸入。 </li><li>无菌解剖肺组织手术刀，杜蒙超细镊子和手术剪。小心地取出实质和血管。放置肺组织入冰冷的组织洗涤培养基运输到实验室，如果适用的话。 </li><li>进一步解剖支气管浸没在组织培养基洗涤并分离支气管直径为1到2.5mm，从外周肺组织。切片支气管组织成约5毫米厚的支气管环用手术刀。 </li&gt; <li>使用的无菌弯microdissecting镊子掏挖的议案，拿起支气管片段并将其放置到的菜划伤的地方。 </li><li>取出组织洗涤培养基，孵育所述片段在RT〜5分钟，以使它们附着在菜肴。 </li><li>加入10 mL完全愈合中的每道菜，并放置在一个可控气氛模块化孵化室。冲洗具有高的 O 2的混合气体（70％O 2，25％N 2和5％的CO 2，）的腔室。放置室在台式轨道培养箱，在37℃下摇晃。摇动室放置24小时以每分钟10个循环，以允许介质流间歇以上的片段。 </li><li>经过24小时培养后，观察在相差倒置显微镜下的组织外植体。选择支气管外植体完整，汗毛运动与活泼的支气管上皮细胞进行后续的LMP治疗。 </li></ol>2.2）的LMP治疗<ol><li>制备完全生长培养基如下:解冻生长培养基补充剂在冰上血清和成纤维细胞抑制剂。加入1毫升的生长培养基补充有血清和200μl的成纤维细胞抑制剂至100ml生长培养基;调匀。升温，在37℃的完全生长培养基在使用前10分钟。 </li><li>稀分离的LMP在一个新的无菌微量离心管中，用PBS以制备的LMP股票以800微克/毫升的浓度。 </li><li>加入0.5毫升完全生长培养基中以12孔组织培养板的各孔中。 </li><li>传送与从先前的协议（第2.1节），以在组织培养板的各孔的弯曲microdissecting钳子所选支气管植。 </li><li>适当标记培养板，以确定的LMP处理井和控制井。添加25微升的LMP库存入每个的LMP处理井（对于40微克/ ml的终浓度）和25μl的对照载体（见LMP<html>的生产），以对照孔。 </li><li>继续温育在受控气氛模块化培养箱室中于37℃轻轻摇动。 </li><li> 24小时后，洗涤外植体3次，用PBS中并继续进行下一步骤（4％多聚甲醛[PFA]的固定）。 </li></ol> 3.组织病理学检查 3.1）准备了以下解决方案之前，进行下一个步骤<ol><li>通过混合137 mM氯化钠，2.7 mM的氯化钾，10毫的Na 2 HPO 4，1.76毫KH 2 PO 4，pH 7.4中制备的1×PBS缓冲液中。 </li><li>以制备4％PFA，溶解在400ml水中，在60℃下加热搅拌20克煤灰;加入几滴10 M氢氧化钠以清除溶液。接下来添加1X PBS缓冲和调节音量到500毫升pH值至7.4。筛选和分装;储存在-20℃。 </li><li>准备以下脱水或补液试剂; 100％，90％，70％，50％的乙醇和二甲苯。 </li></ol>e_step"&gt; 3.2）外植体固定，并组织部分脱蜡<ol><li>放置在一个标记的离心管中每一个外植体用1.5ml 4％的PFA和孵化O / N在4℃。与1X PBS冲洗两次植。 </li><li>通过醇系列脱水外植体（70％乙醇:每3次30分钟; 90％乙醇:每2次30分钟; 100％乙醇:3次每次30分钟;然后二甲苯:3次，每次20分钟，每一个）。执行在通风橱中的所有步骤，在RT。 </li><li>在烘箱中嵌入组织外植体中的石蜡在58℃。用旋转切片机准备5微米厚的组织切片。 </li><li>漂浮在56℃水浴的部分，然后装入部分标上组织幻灯片。放置在手动染色机架和干燥载玻片在65℃下1小时。允许滑动以冷却在RT。 </li><li>浸在含有二甲苯，每次10分钟，以去除石蜡连续4次污点菜架。浸齿条在乙醇系列以去除二甲苯:100％，然后95％，第烯80％，然后70％，然后50％乙醇（5分钟，每步）。用自来水冲洗齿条5分钟，以除去乙醇。 </li></ol> 3.3），HE染色（H＆E）染色<ol><li>继续与固定的组织切片工作;齿条放入一个染色皿填充用Mayer氏苏木素15分钟。冲洗齿条用自来水以除去苏木20分钟。 </li><li>放置在蒸馏水中进行30 sec.Place在95％乙醇中30秒。放置在曙红Y溶液染色皿1分钟。脱水，通过对每个2分钟2的变化的95％乙醇，100％乙醇和二甲苯。 </li><li>在显微镜下进行快速检查，以确保剩余的曙红被除去。放置2〜3滴封固剂（费希尔SP15-100）的到每个滑动，然后盖上盖玻璃。 </li></ol> 3.4） 原位细胞凋亡检测:TUNEL法<ol><li>在开始之前，请准备蛋白酶K工作液:20微克/毫升10毫米的Tris /盐酸，pH值7.4。 </li><li>重复步骤1至5节3.2（植固定，组织切片脱蜡）的。冲洗用去离子H 2 O的幻灯片</li><li>浸入用1×PBS的幻灯片10分钟。沥干多余的PBS。孵育组织切片30分钟，在RT下用蛋白酶K工作溶液。冲洗1X PBS滑两次。 </li><li>细胞死亡检测试剂盒的使用说明书中所述进行TUNEL法。安装使用安装介质中，并与盖玻片盖玻片手动。 </li><li>在光学显微镜下分析样品。使用图像Pro的4.5来分析细胞凋亡褐色。 </li></ol>

<ol>
	<li>Tushuizen, M. E., Diamant, M., Sturk, A., Nieuwland, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell-derived+microparticles+in+the+pathogenesis+of+cardiovascular+disease:+friend+or+foe.">Cell-derived microparticles in the pathogenesis of cardiovascular disease: friend or foe.</a> Arterioscler Thromb Vasc Biol. 31 (1), 4-9 (2011).</li><li>Martinez, M. C., Tual-Chalot, S., Leonetti, D., Andriantsitohaina, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microparticles:+targets+and+tools+in+cardiovascular+disease.">Microparticles: targets and tools in cardiovascular disease.</a> Trends Pharmacol Sci. 32 (11), 659-665 (2011).</li><li>Benameur, T., Andriantsitohaina, R., Martinez, M. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Therapeutic+potential+of+plasma+membrane-derived+microparticles.">Therapeutic potential of plasma membrane-derived microparticles.</a> Pharmacol Rep. 61 (1), 49-57 (2009).</li><li>Yang, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lymphocytic+microparticles+inhibit+angiogenesis+by+stimulating+oxidative+stress+and+negatively+regulating+VEGF-induced+pathways.">Lymphocytic microparticles inhibit angiogenesis by stimulating oxidative stress and negatively regulating VEGF-induced pathways.</a> Am J Physiol Regul Integr Comp Physiol. 294 (2), 467-476 (2008).</li><li>Yang, C., Gagnon, C., Hou, X., Hardy, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Low+density+lipoprotein+receptor+mediates+anti-VEGF+effect+of+lymphocyte+T-derived+microparticles+in+Lewis+lung+carcinoma+cells.">Low density lipoprotein receptor mediates anti-VEGF effect of lymphocyte T-derived microparticles in Lewis lung carcinoma cells.</a> Cancer Biol Ther. 10 (5), 448-456 (2010).</li><li>Angelillo-Scherrer, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Leukocyte-derived+microparticles+in+vascular+homeostasis.">Leukocyte-derived microparticles in vascular homeostasis.</a> Circ Res. 110 (2), 356-369 (2012).</li><li>Maeno, T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CD8++T+Cells+are+required+for+inflammation+and+destruction+in+cigarette+smoke-induced+emphysema+in+mice.">CD8+ T Cells are required for inflammation and destruction in cigarette smoke-induced emphysema in mice.</a> J Immunol. 178 (12), 8090-8096 (2007).</li><li>Qiu, Q., Xiong, W., Yang, C., Gagnon, C., Hardy, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lymphocyte-derived+microparticles+induce+bronchial+epithelial+cells'+pro-inflammatory+cytokine+production+and+apoptosis.">Lymphocyte-derived microparticles induce bronchial epithelial cells' pro-inflammatory cytokine production and apoptosis.</a> Mol Immunol. 55 (3-4), 220-230 (2013).</li><li>Martin, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Shed+membrane+particles+from+T+lymphocytes+impair+endothelial+function+and+regulate+endothelial+protein+expression.">Shed membrane particles from T lymphocytes impair endothelial function and regulate endothelial protein expression.</a> Circulation. 109 (13), 1653-1659 (2004).</li><li>Shet, A. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sickle+blood+contains+tissue+factor-positive+microparticles+derived+from+endothelial+cells+and+monocytes.">Sickle blood contains tissue factor-positive microparticles derived from endothelial cells and monocytes.</a> Blood. 102 (7), 2678-2683 (2003).</li><li>Mause, S. F., Weber, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microparticles:+protagonists+of+a+novel+communication+network+for+intercellular+information+exchange.">Microparticles: protagonists of a novel communication network for intercellular information exchange.</a> Circ Res. 107 (9), 1047-1057 (2010).</li><li>Yang, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Anti-proliferative+and+anti-tumour+effects+of+lymphocyte-derived+microparticles+are+neither+species-+nor+tumour-type+specific.">Anti-proliferative and anti-tumour effects of lymphocyte-derived microparticles are neither species- nor tumour-type specific.</a> J Extracell Vesicles. 3, (2014).</li><li>Soleti, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microparticles+harboring+Sonic+Hedgehog+promote+angiogenesis+through+the+upregulation+of+adhesion+proteins+and+proangiogenic+factors.">Microparticles harboring Sonic Hedgehog promote angiogenesis through the upregulation of adhesion proteins and proangiogenic factors.</a> Carcinogenesis. 30 (4), 580-588 (2009).</li></ol>

作者什么都没有透露。

国会议员是细胞间串扰活性介质和他们的研究是有希望在科学的许多领域。11本研究中提出的体外大规模发电的LMP从凋亡T细胞系衍生的详细协议。这些国会议员表达细胞分子的大型剧目，并且生物牵连的细胞和组织稳态的调节。然而，LMP的源于不同来源可能是生物学上不同。4,9,12,13 的LMP显示根据用于生成它们在体外刺激和从它们所衍生自的细胞?...

Microparticles (MPs) are biologically active submicron membrane vesicles released following cell activation or apoptosis. MPs are derived from both healthy and damaged cells and are implicated in many physiological and pathological processes.1 MPs have been detected not only in human plasma, but also in inflammatory and apoptotic tissue. The biological utility of cell membrane&#8211;derived MPs has been demonstrated in various settings, including cell signalling models and as pharmacological tools.2,3 We previously demonstrated that LMPs derived from T lymphocytes following actinomycin D stimulation (to induce apoptosis) suppress angiogenesis and inhibit endothelial cell survival and proliferation.4,5 The antiangiogenic effects of LMPs may vary significantly depending on the stimuli used to activate T lymphocytes in vitro.6
The airway epithelium functions as a protective physical and functional barrier. Increased numbers of T lymphocytes in the airway can contribute to cell damage and airway inflammation.7 We have shown that LMPs induce apoptosis of human bronchial epithelial cells,8 which indicated LMPs may change barrier function of bronchial epithelium in vivo. Apoptotic cells can be identified using the TUNEL method, which detects in situ DNA fragmentation. 
The overall goal of this protocol is to illustrate the in vitro production of LMPs from a T lymphocyte cell line, and to demonstrate their proapoptotic effect on airway epithelial cells. In situ cell death detection demonstrated that LMPs strongly induce airway bronchial epithelial cell death, suggesting that LMPs-mediated injury to the airway epithelium may impact barrier function of the damaged epithelium.

<table border="0" cellpadding="0" cellspacing="0" width="828">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">LMPs production and characterization</td>
			<td style="width:231px;"></td>
			<td style="width:124px;"></td>
			<td style="width:171px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">CEM T cells&#160;</td>
			<td style="width:231px;">ATCC&#160;</td>
			<td style="width:124px;">CCL-119</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">X-VIVO 15 medium&#160;</td>
			<td style="width:231px;">Cambrex, Walkersville</td>
			<td>04-744Q</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Flask T75</td>
			<td style="width:231px;">Sarstedt</td>
			<td style="width:124px;">83.1813.502</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Flask T175</td>
			<td style="width:231px;">Sarstedt</td>
			<td style="width:124px;">83.1812.502</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Actinomycin&#160;D&#160;</td>
			<td style="width:231px;">Sigma Chemical Co.</td>
			<td style="width:124px;">A9415-2mg</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">PBS</td>
			<td style="width:231px;">Lifetechnologies</td>
			<td>14190-144</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">0.22&#181;m filter</td>
			<td style="width:231px;">Sarstedt</td>
			<td style="width:124px;">83.1826.001</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Annexin-VCy5</td>
			<td style="width:231px;">BD Pharmagen&#160;</td>
			<td>559933</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">FACS flow solution</td>
			<td>BD Bio-sciences</td>
			<td style="width:124px;">342003</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Fluorescent microbeads (1 um)</td>
			<td style="width:231px;">Molecular Probes&#160;</td>
			<td style="width:124px;">T8880</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Polysterene counting beads (7 um)</td>
			<td style="width:231px;">Bangs laboratories</td>
			<td style="width:124px;">PS06N/6994</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Polypropylene FACS tubes</td>
			<td>Falcon</td>
			<td style="width:124px;">352058</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">1 ml pipet</td>
			<td style="width:231px;">Fisher</td>
			<td style="width:124px;">13-678-11B</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">5 ml pipet</td>
			<td style="width:231px;">Falcon</td>
			<td style="width:124px;">357543</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">25 ml pipet</td>
			<td style="width:231px;">Ultident</td>
			<td style="width:124px;">DL-357551</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">1,5 ml conical polypropylene micro tube</td>
			<td style="width:231px;">Sarstedt</td>
			<td style="width:124px;">72.690</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">15 ml conical polypropylene tube</td>
			<td style="width:231px;">Sarstedt</td>
			<td style="width:124px;">62.554.205</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">50 ml conical polypropylene tube</td>
			<td style="width:231px;">Sarstedt</td>
			<td style="width:124px;">62.547.205</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:303px;">50 ml high speed polypropylene copolymer tube</td>
			<td style="width:231px;">Nalgene</td>
			<td style="width:124px;">3119-0050</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">250 ml high speed polypropylene bottle</td>
			<td style="width:231px;">Beckman</td>
			<td style="width:124px;">356011</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Protein assay (Bradford assay)</td>
			<td>Bio-Rad Laboratories</td>
			<td>500-0006</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Protein assay standard II</td>
			<td>Bio-Rad Laboratories</td>
			<td>500-0007</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Test tube 16x100</td>
			<td>VWR</td>
			<td>47729-576</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Test tube 12x75</td>
			<td>Ultident</td>
			<td>170-14100005B</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Cell incubator&#160;</td>
			<td style="width:231px;">Mandel</td>
			<td style="width:124px;">Heracell 150</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Low speed centrifuge</td>
			<td style="width:231px;">IEC</td>
			<td style="width:124px;">Centra8R</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:303px;">High speed centrifuge</td>
			<td style="width:231px;">Beckman</td>
			<td style="width:124px;">Avanti J8</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">High speed rotor for 250ml bottle</td>
			<td style="width:231px;">Beckman</td>
			<td style="width:124px;">JLA16.250</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">High speed rotor for 50ml tube</td>
			<td style="width:231px;">Beckman</td>
			<td style="width:124px;">JA30.50</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Fow cytometry&#160;</td>
			<td>BD Bio-sciences</td>
			<td style="width:124px;">FACS Calibur</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Spectrophotometer</td>
			<td style="width:231px;">Beckman</td>
			<td style="width:124px;">Series 600</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;"></td>
			<td style="width:231px;"></td>
			<td style="width:124px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Bronchial tissue explants and sections&#160;</td>
			<td style="width:231px;"></td>
			<td style="width:124px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">C57BL/6 mice (5-7 weeks old)&#160;&#160;</td>
			<td style="width:231px;">Charles River Laboratories, Inc.&#160;</td>
			<td style="width:124px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mouse Airway PrimaCell&#8482; System:</td>
			<td style="width:231px;">CHI Scientific, Inc.</td>
			<td style="width:124px;">2-82001</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">&#160;Rib-Back Carbon Steel Scalpel Blades</td>
			<td style="width:231px;">Becton Dickinson AcuteCare</td>
			<td style="width:124px;">371310</td>
			<td>#10</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Scalpel Handle</td>
			<td style="width:231px;">Fine Science Tools Inc.&#160;</td>
			<td style="width:124px;">10003-12</td>
			<td>#7</td>
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		<tr height="21">
			<td height="21" style="height:21px;">phase-contrast inverted microscope</td>
			<td style="width:231px;">Olympus Optical CO., LTD.&#160;&#160;&#160;</td>
			<td style="width:124px;">CK2</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">high O2 gas mixture&#160;</td>
			<td>VitalAire Canada Inc.</td>
			<td style="width:124px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">modular incubator chamber</td>
			<td style="width:231px;">Billups-Rothenberg Inc.</td>
			<td style="width:124px;">MIC-101</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MaxQ 4000 incubated orbital shaker</td>
			<td style="width:231px;">Barnstead Lab-Line,&#160;</td>
			<td style="width:124px;">SHKA4000-7</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">12-well tissue culture plate</td>
			<td style="width:231px;">Becton Dickinson and Company</td>
			<td style="width:124px;">353043</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Plastic tissue culture dishes (100 mm)</td>
			<td style="width:231px;">Sarstedt, Inc.</td>
			<td style="width:124px;">83.1802</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:303px;">Surgical scissors</td>
			<td style="width:231px;">Fine Science Tools Inc.&#160;</td>
			<td style="width:124px;">14060-09</td>
			<td style="width:171px;">Straight, sharp, 9cm longth</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">Half-curved Graefe forceps</td>
			<td style="width:231px;">Fine Science Tools Inc.&#160;</td>
			<td style="width:124px;">11052-10</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">humidified CO2 incubator</td>
			<td style="width:231px;">Mandel Scientific Company Inc.&#160;</td>
			<td style="width:124px;">SVH-51023421</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;"></td>
			<td style="width:231px;"></td>
			<td style="width:124px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">&#160;Histopathological examination&#160;</td>
			<td style="width:231px;"></td>
			<td style="width:124px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">formalin formaldehyde</td>
			<td style="width:231px;">Sigma-Aldrich, Inc.&#160;</td>
			<td style="width:124px;">HT5011</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">paraffin</td>
			<td style="width:231px;">Fisher scientific&#160; International, Inc.</td>
			<td style="width:124px;">T555</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">ethyl alcohol</td>
			<td style="width:231px;">Merck KGaA, Darmstadt</td>
			<td style="width:124px;">EX0278-1</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">&#160;glutaraldehyde&#160;</td>
			<td style="width:231px;">Sigma-Aldrich, Inc.&#160;</td>
			<td style="width:124px;">G6403</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Cacodylate</td>
			<td style="width:231px;">Sigma-Aldrich, Inc.&#160;</td>
			<td style="width:124px;">31533</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">microscope slides</td>
			<td style="width:231px;">VWR Scientific Inc.&#160;</td>
			<td style="width:124px;">48300-025</td>
			<td>25x75mm</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Xylene</td>
			<td style="width:231px;">Fisher scientific&#160; International, Inc.</td>
			<td style="width:124px;">X5-4</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mayer&#39;s hematoxylin</td>
			<td style="width:231px;">Sigma-Aldrich, Inc.&#160;</td>
			<td style="width:124px;">MHS16</td>
			<td>Funnel with filter paper&#160;&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">HCl&#160;</td>
			<td style="width:231px;">Fisher scientific&#160; International, Inc.&#160;&#160;</td>
			<td style="width:124px;">A144s-500</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">eosin&#160;</td>
			<td style="width:231px;">Sigma-Aldrich, Inc.&#160;</td>
			<td style="width:124px;">HT110116</td>
			<td>Funnel with filter paper&#160;&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Permount&#8482; Mounting Medium</td>
			<td style="width:231px;">Thermo Fisher Scientific Inc.&#160;</td>
			<td>SP15-100</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">glass coverslip</td>
			<td style="width:231px;">surgipath medical industries, Inc.</td>
			<td style="width:124px;">84503</td>
			<td>24&#215;24&#160;#1&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">TUNEL detection kit</td>
			<td style="width:231px;">In Situ Cell Death Detection, POD</td>
			<td style="width:124px;">11 684 817 910</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">oven</td>
			<td style="width:231px;">Despatch Industries Inc.</td>
			<td style="width:124px;">LEB-1-20</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">rotary Microtome</td>
			<td style="width:231px;">Leica Microsystems Inc.</td>
			<td style="width:124px;">RM2145</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">filter paper</td>
			<td style="width:231px;">Whatman International Ltd.</td>
			<td style="width:124px;">1003150</td>
			<td>#3</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Microscope</td>
			<td style="width:231px;">Nikon Imaging Japan Inc.</td>
			<td style="width:124px;">E800</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">staining dish complete</td>
			<td style="width:231px;">Wheaton Industries, Inc.</td>
			<td>900200</td>
			<td>including dish, rack, cover</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:303px;">1.5 ml eppendorf tube</td>
			<td style="width:231px;">Sarstedt Inc.&#160;</td>
			<td style="width:124px;">72.69</td>
			<td>39x10mm</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Orbital and Reciprocating Water Bath</td>
			<td style="width:231px;">ExpotechUSA</td>
			<td style="width:124px;">ORS200</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">phosphate buffered saline&#160;&#160;</td>
			<td style="width:231px;">GIBCO</td>
			<td style="width:124px;">14190-144</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">fume hood</td>
			<td>Nicram RD Service</td>
			<td>3707E</td>
			<td></td>
		</tr>
	</tbody>
</table>

generation of lymphocytic microparticles and detection of their proapoptotic effect on airway epithelial cells

在细胞 - 细胞通讯细胞膜衍生囊泡的生物角色的兴趣，近年来已增加。微粒（MPS）是一种这样的类型的小泡，直径范围为0.1微米至1微米，并且通常从真核细胞进行活化或凋亡的质膜棚。在这里，我们描述了从凋亡的CEM T细胞与放线菌素D的LMP是通过一个多步差速离心处理分离和表征使用流式细胞术刺激的T淋巴细胞衍生的微粒（的LMP）的生成。该协议也为展示的LMP对小鼠原发性呼吸支气管组织植源性支气管上皮细胞凋亡的作用原位细胞死亡检测方法。本文描述的方法在体外分离量的LMP丰富的淋巴细胞凋亡提供了可重复的过程。 LMP的派生以这种方式可以用来评价各种疾病模型的特征，并为药理学和毒理学试验。鉴于气道上皮提供外部环境和下面的组织之间的保护物理和功能障碍，使用支气管组织的外植体，而不是永生化上皮细胞系提供了有效的模型用于要求气道组织的调查。

通过荧光激活细胞分选（FACS）分析，并使用1微米的小珠，其中国会议员（≤1微米）的97％的人膜联蛋白-V-Cy5的阳性门控的LMP进行表征与膜联蛋白V染色10（ 图1A和1B）。通常情况下，的LMP为约2.5毫克，得到下列该协议。从C57BL支气管组织的外植体/ 6小鼠进行车辆和的LMP治疗。支气管切片的组织病理学分析揭示的LMP对支气管上皮细胞的结构完整性的影响。在对照外植体，细支气管...

Watch this Scientific Journal Video about Generation of Lymphocytic Microparticles and Detection of their Proapoptotic Effect on Airway Epithelial Cells at JoVE.com

Generation of Lymphocytic Microparticles and Detection of their Proapoptotic Effect on Airway Epithelial Cells

细胞膜棚微粒（MPS）是活性生物囊泡可以分离和它们的病理生理作用研究了各种模型。在这里，我们描述了从生成T淋巴细胞（的LMP）得出国会议员和展示他们对气道上皮细胞凋亡作用的方法。

淋巴细胞微粒和检测其促凋亡作用的气道上皮细胞产生

Interest in the biological roles of cell membrane&#8211;derived vesicles in cell&#8211;cell communication has increased in recent years. Microparticles ...

generation-lymphocytic-microparticles-detection-their-proapoptotic

Research

JoVE Journal

Immunology and Infection

8.9K 次观看.  University of Montréal. 细胞膜棚微粒（MPS）是活性生物囊泡可以分离和它们的病理生理作用研究了各种模型。在这里，我们描述了从生成T淋巴细胞（的LMP）得出国会议员和展示他们对气道上皮细胞凋亡作用的方法。 

视频: Generation of Lymphocytic Microparticles and Detection of their Proapoptotic Effect on Airway Epithelial Cells

Co-culture Models of Pseudomonas aeruginosa Biofilms Grown on Live Human Airway Cells

Bacterial biofilms have been associated with a number of different human diseases, but biofilm development has generally been studied on non-living surfaces. In this paper, we describe protocols for forming Pseudomonas aeruginosa biofilms on human airway epithelial cells (CFBE cells) grown in culture. In the first method (termed the Static Co-culture Biofilm Model), P. aeruginosa is incubated with CFBE cells grown as confluent monolayers on standard tissue culture plates. Although the bacterium is quite toxic to epithelial cells, the addition of arginine delays the destruction of the monolayer long enough for biofilms to form on the CFBE cells. The second method (termed the Flow Cell Co-culture Biofilm Model), involves adaptation of a biofilm flow cell apparatus, which is often used in biofilm research, to accommodate a glass coverslip supporting a confluent monolayer of CFBE cells. This monolayer is inoculated with P. aeruginosa and a peristaltic pump then flows fresh medium across the cells. In both systems, bacterial biofilms form within 6-8 hours after inoculation. Visualization of the biofilm is enhanced by the use of P. aeruginosa strains constitutively expressing green fluorescent protein (GFP). The Static and Flow Cell Co-culture Biofilm assays are model systems for early P. aeruginosa infection of the Cystic Fibrosis (CF) lung, and these techniques allow different aspects of P. aeruginosa biofilm formation and virulence to be studied, including biofilm cytotoxicity, measurement of biofilm CFU, and staining and visualizing the biofilm.

Co-culture Models of Pseudomonas aeruginosa Biofilms Grown on Live Human Airway Cells

This paper describes different methods of growing Pseudomonas aeruginosa biofilms on cultured human airway epithelial cells. These protocols can be adapted to study different aspects of biofilm formation, including visualization of the biofilm, staining of the biofilm, measuring the colony forming units (CFU) of the biofilm, and studying biofilm cytotoxicity.

共培养模型绿脓杆菌现场人类呼吸道细胞生长的生物膜

Bacterial biofilms have been associated with a number of different human diseases, but biofilm development has generally been studied on non-living ...

科研

免疫与感染

Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce

This protocol describes a simple approach for adhesive-tape-based sampling of tomato and other fresh produce surfaces, followed by on-tape fluorescence in situ hybridization (FISH) for rapid culture-independent detection of Salmonella spp. Cell-charged tapes can also be placed face-down on selective agar for solid-phase enrichment prior to detection. Alternatively, low-volume liquid enrichments (liquid surface miniculture) can be performed on the surface of the tape in non-selective broth, followed by FISH and analysis via flow cytometry. To begin, sterile adhesive tape is brought into contact with fresh produce, gentle pressure is applied, and the tape is removed, physically extracting microbes present on these surfaces. Tapes are mounted sticky-side up onto glass microscope slides and the sampled cells are fixed with 10% formalin (30 min) and dehydrated using a graded ethanol series (50, 80, and 95%; 3 min each concentration). Next, cell-charged tapes are spotted with buffer containing a Salmonella-targeted DNA probe cocktail and hybridized for 15 - 30 min at 55&deg;C, followed by a brief rinse in a washing buffer to remove unbound probe. Adherent, FISH-labeled cells are then counterstained with the DNA dye 4',6-diamidino-2-phenylindole (DAPI) and results are viewed using fluorescence microscopy. For solid-phase enrichment, cell-charged tapes are placed face-down on a suitable selective agar surface and incubated to allow in situ growth of Salmonella microcolonies, followed by FISH and microscopy as described above. For liquid surface miniculture, cell-charged tapes are placed sticky side up and a silicone perfusion chamber is applied so that the tape and microscope slide form the bottom of a water-tight chamber into which a small volume (&le; 500 &mu;L) of Trypticase Soy Broth (TSB) is introduced. The inlet ports are sealed and the chambers are incubated at 35 - 37&deg;C, allowing growth-based amplification of tape-extracted microbes. Following incubation, inlet ports are unsealed, cells are detached and mixed with vigorous back and forth pipetting, harvested via centrifugation and fixed in 10% neutral buffered formalin. Finally, samples are hybridized and examined via flow cytometry to reveal the presence of Salmonella spp. As described here, our "tape-FISH" approach can provide simple and rapid sampling and detection of Salmonella on tomato surfaces. We have also used this approach for sampling other types of fresh produce, including spinach and jalape&ntilde;o peppers.

Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce

This protocol describes a simple adhesive-tape-based approach for sampling of tomato and other fresh produce surfaces, followed by rapid whole cell detection of Salmonella using fluorescence in situ hybridization (FISH).

胶粘剂基于磁带的采样和荧光组合原位杂交快速检测沙门氏菌新鲜农产品

This protocol describes a simple approach for adhesive-tape-based sampling of tomato and other fresh produce surfaces, followed by on-tape fluorescence in ...

In Vitro Assay of Bacterial Adhesion onto Mammalian Epithelial Cells

To cause infections, bacteria must colonize their host. Bacterial pathogens express various molecules or structures able to promote attachment to host cells1. These adhesins rely on interactions with host cell surface receptors or soluble proteins acting as a bridge between bacteria and host. Adhesion is a critical first step prior to invasion and/or secretion of toxins, thus it is a key event to be studied in bacterial pathogenesis. Furthermore, adhered bacteria often induce exquisitely fine-tuned cellular responses, the studies of which have given birth to the field of 'cellular microbiology'2. Robust assays for bacterial adhesion on host cells and their invasion therefore play key roles in bacterial pathogenesis studies and have long been used in many pioneer laboratories3,4. These assays are now practiced by most laboratories working on bacterial pathogenesis.
Here, we describe a standard adherence assay illustrating the contribution of a specific adhesin. We use the Escherichia coli strain 27875, a human pathogenic strain expressing the autotransporter Adhesin Involved in Diffuse Adherence (AIDA). As a control, we use a mutant strain lacking the aidA gene, 2787&Delta;aidA (F. Berthiaume and M. Mourez, unpublished), and a commercial laboratory strain of E. coli, C600 (New England Biolabs). The bacteria are left to adhere to the cells from the commonly used HEp-2 human epithelial cell line. This assay has been less extensively described before6.

In Vitro Assay of Bacterial Adhesion onto Mammalian Epithelial Cells

This protocol is a simple bacterial adhesion assay consisting in counting the numbers of bacterial colony forming units that are adhered onto cultured cells. The assay is robust, independent of the adhesin studied, and numerous variations are used in most laboratories working on bacterial pathogenesis.

到哺乳动物的上皮细胞在体外细菌粘附的含量

To cause infections, bacteria must colonize their host. Bacterial pathogens express various molecules or structures able to promote attachment to host ...

Application of a Mouse Ligated Peyer&#x2019;s Patch Intestinal Loop Assay to Evaluate Bacterial Uptake by M cells

The inside of our gut is inhabited with enormous number of commensal bacteria. The mucosal surface of the gastrointestinal tract is continuously exposed to them and occasionally to pathogens. The gut-associated lymphoid tissue (GALT) play a key role for induction of the mucosal immune response to these microbes1, 2. To initiate the mucosal immune response, the mucosal antigens must be transported from the gut lumen across the epithelial barrier into organized lymphoid follicles such as Peyer's patches. This antigen transcytosis is mediated by specialized epithelial M cells3, 4. M cells are atypical epithelial cells that actively phagocytose macromolecules and microbes. Unlike dendritic cells (DCs) and macrophages, which target antigens to lysosomes for degradation, M cells mainly transcytose the internalized antigens. This vigorous macromolecular transcytosis through M cells delivers antigen to the underlying organized lymphoid follicles and is believed to be essential for initiating antigen-specific mucosal immune responses. However, the molecular mechanisms promoting this antigen uptake by M cells are largely unknown. We have previously reported that glycoprotein 2 (Gp2), specifically expressed on the apical plasma membrane of M cells among enterocytes, serves as a transcytotic receptor for a subset of commensal and pathogenic enterobacteria, including Escherichia coli and Salmonella enterica serovar Typhimurium (S. Typhimurium), by recognizing FimH, a component of type I pili on the bacterial outer membrane 5. Here, we present a method for the application of a mouse Peyer's patch intestinal loop assay to evaluate bacterial uptake by M cells. This method is an improved version of the mouse intestinal loop assay previously described 6, 7. The improved points are as follows: 1. Isoflurane was used as an anesthetic agent. 2. Approximately 1 cm ligated intestinal loop including Peyer's patch was set up. 3. Bacteria taken up by M cells were fluorescently labeled by fluorescence labeling reagent or by overexpressing fluorescent protein such as green fluorescent protein (GFP). 4. M cells in the follicle-associated epithelium covering Peyer's patch were detected by whole-mount immunostainig with anti Gp2 antibody. 5. Fluorescent bacterial transcytosis by M cells were observed by confocal microscopic analysis. The mouse Peyer's patch intestinal loop assay could supply the answer what kind of commensal or pathogenic bacteria transcytosed by M cells, and may lead us to understand the molecular mechanism of how to stimulate mucosal immune system through M cells.

Application of a Mouse Ligated Peyer&#8217;s Patch Intestinal Loop Assay to Evaluate Bacterial Uptake by M cells

M cells in a specialized follicle-associated epithelium covering Peyer&#x2019;s patches play an important role for the mucosal immunosurveillance in gut-associated lymphoid tissue. Here we described the evaluation method for bacterial transcytosis by M cells in vivo. This method provides a method to understand M-cell function in the immune system.

鼠标应用结扎Peyer氏修补肠袢含量评价M细胞的细菌吸收

The inside of our gut is inhabited with enormous number of commensal bacteria. The mucosal surface of the gastrointestinal tract is continuously exposed ...

The Synergistic Effect of Visible Light and Gentamycin on Pseudomona aeruginosa Microorganisms

Recently there were several publications on the bactericidal effect of visible light, most of them claiming that blue part of the spectrum (400 nm-500 nm) is responsible for killing various pathogens1-5. The phototoxic effect of blue light was suggested to be a result of light-induced reactive oxygen species (ROS) formation by endogenous bacterial photosensitizers which mostly absorb light in the blue region4,6,7. There are also reports of biocidal effect of red and near infra red8 as well as green light9.
In the present study, we developed a method that allowed us to characterize the effect of high power green (wavelength of 532 nm) continuous (CW) and pulsed Q-switched (Q-S) light on Pseudomonas aeruginosa. Using this method we also studied the effect of green light combined with antibiotic treatment (gentamycin) on the bacteria viability. P. aeruginosa is a common noscomial opportunistic pathogen causing various diseases. The strain is fairly resistant to various antibiotics and contains many predicted AcrB/Mex-type RND multidrug efflux systems10.
The method utilized free-living stationary phase Gram-negative bacteria (P. aeruginosa strain PAO1), grown in Luria Broth (LB) medium exposed to Q-switched and/or CW lasers with and without the addition of the antibiotic gentamycin. Cell viability was determined at different time points. The obtained results showed that laser treatment alone did not reduce cell viability compared to untreated control and that gentamycin treatment alone only resulted in a 0.5 log reduction in the viable count for P. aeruginosa. The combined laser and gentamycin treatment, however, resulted in a synergistic effect and the viability of P. aeruginosa was reduced by 8 log's.
The proposed method can further be implemented via the development of catheter like device capable of injecting an antibiotic solution into the infected organ while simultaneously illuminating the area with light.

The Synergistic Effect of Visible Light and Gentamycin on Pseudomona aeruginosa Microorganisms

We show that a developed biomedical device involving continuous or pulsed visible laser based treatment that is combined with antibiotic treatment (gentamycin), results in a statistically significant synergistic effect leading to a reduction in the viability of P. aeruginosa PAO1, by 8 log's compared to antibiotic treatment alone.

可见光和庆大霉素的协同作用<em&gt;假单胞菌假单胞菌</em&gt;微生物

Recently there were several publications on the  bactericidal effect of visible light, most of them claiming that blue part of  the spectrum (400 nm-500 ...

Establishing a Liquid-covered Culture of Polarized Human Airway Epithelial Calu-3 Cells to Study Host Cell Response to Respiratory Pathogens In vitro

The apical and basolateral surfaces of airway epithelial cells demonstrate directional responses to pathogen exposure in vivo. Thus, ideal in vitro models for examining cellular responses to respiratory pathogens polarize, forming apical and basolateral surfaces. One such model is differentiated normal human bronchial epithelial cells (NHBE). However, this system requires lung tissue samples, expertise isolating and culturing epithelial cells from tissue, and time to generate an air-liquid interface culture.
Calu-3 cells, derived from a human bronchial adenocarcinoma, are an alternative model for examining the response of proximal airway epithelial cells to respiratory insult1, pharmacological compounds2-6, and bacterial7-9 and viral pathogens, including influenza virus, rhinovirus and severe acute respiratory syndrome - associated coronavirus10-14. Recently, we demonstrated that Calu-3 cells are susceptible to respiratory syncytial virus (RSV) infection in a manner consistent with NHBE15,16 . Here, we detail the establishment of a polarized, liquid-covered culture (LCC) of Calu-3 cells, focusing on the technical details of growing and culturing Calu-3 cells, maintaining cells that have been cultured into LCC, and we present the method for performing respiratory virus infection of polarized Calu-3 cells.
To consistently obtain polarized Calu-3 LCC, Calu-3 cells must be carefully subcultured before culturing in Transwell inserts. Calu-3 monolayer cultures should remain below 90% confluence, should be subcultured fewer than 10 times from frozen stock, and should regularly be supplied with fresh medium. Once cultured in Transwells, Calu-3 LCC must be handled with care. Irregular media changes and mechanical or physical disruption of the cell layers or plates negatively impact polarization for several hours or days. Polarization is monitored by evaluating trans-epithelial electrical resistance (TEER) and is verified by evaluating the passive equilibration of sodium fluorescein between the apical and basolateral compartments17,18 . Once TEER plateaus at or above 1,000 &Omega;&times;cm2, Calu-3 LCC are ready to use to examine cellular responses to respiratory pathogens.

Establishing a Liquid-covered Culture of Polarized Human Airway Epithelial Calu-3 Cells to Study Host Cell Response to Respiratory Pathogens In vitro

The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.

建立的液体覆盖的文化偏光人类呼吸道上皮的CALU-3细胞研究呼吸系统病原宿主细胞的反应<em在体外</em

The  apical and basolateral surfaces of airway epithelial cells demonstrate  directional responses to pathogen exposure in  vivo. Thus, ideal in vitro ...

Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus

In this protocol we provide a method to isolate dendritic cells (DC) and epithelial cells (TEC) from the human thymus. DC and TEC are the major antigen presenting cell (APC) types found in a normal thymus and it is well established that they play distinct roles during thymic selection. These cells are localized in distinct microenvironments in the thymus and each APC type makes up only a minor population of cells. To further understand the biology of these cell types, characterization of these cell populations is highly desirable but due to their low frequency, isolation of any of these cell types requires an efficient and reproducible procedure. This protocol details a method to obtain cells suitable for characterization of diverse cellular properties. Thymic tissue is mechanically disrupted and after different steps of enzymatic digestion, the resulting cell suspension is enriched using a Percoll density centrifugation step. For isolation of myeloid DC (CD11c+), cells from the low-density fraction (LDF) are immunoselected by magnetic cell sorting. Enrichment of TEC populations (mTEC, cTEC) is achieved by depletion of hematopoietic (CD45hi) cells from the low-density Percoll cell fraction allowing their subsequent isolation via fluorescence activated cell sorting (FACS) using specific cell markers. The isolated cells can be used for different downstream applications.

This protocol details a method to isolate antigen presenting cells from human thymus via different steps of enzymatic digestion of the tissue followed by density centrifugation of the single cell suspension and finally magnetic and/or FACS sorting of the cell populations of interest.

从人类胸腺髓样树突状细胞和上皮细胞的分离

In this protocol we provide a method to isolate dendritic cells (DC) and epithelial cells (TEC) from the human thymus. DC and TEC are the major antigen ...

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Antibodies against red blood cells (RBCs) can lead to complement activation resulting in an accelerated clearance via complement receptors in the liver (extravascular hemolysis) or leading to intravascular lysis of RBCs. Alloantibodies (e.g. ABO) or autoantibodies to RBC antigens (as seen in autoimmune hemolytic anemia, AIHA) leading to complement activation are potentially harmful and can be - especially when leading to intravascular lysis - fatal1. Currently, complement activation due to (auto)-antibodies on RBCs is assessed in vitro by using the Coombs test reflecting complement deposition on RBC or by a nonquantitative hemolytic assay reflecting RBC lysis1-4. However, to assess the efficacy of complement inhibitors, it is mandatory to have quantitative techniques. Here we describe two such techniques. First, an assay to detect C3 and C4 deposition on red blood cells that is induced by antibodies in patient serum is presented. For this, FACS analysis is used with fluorescently labeled anti-C3 or anti-C4 antibodies. Next, a quantitative hemolytic assay is described. In this assay, complement-mediated hemolysis induced by patient serum is measured making use of spectrophotometric&#160;detection of the released hemoglobin. Both of these assays are very reproducible and quantitative, facilitating studies of antibody-induced complement activation.

Here we describe two assays for measuring complement activation induced by antibodies against red blood cells. The major advantage over the current assays is their quantitative and easy-to-interpret nature.

定量检测抗体诱导补体激活的方法对红血细胞

Antibodies against red blood cells (RBCs) can lead to complement activation resulting in an accelerated clearance via complement receptors in the liver ...

Isolation, Identification, and Purification of Murine Thymic Epithelial Cells

The thymus is a vital organ for T lymphocyte development. Of thymic stromal cells, thymic epithelial cells (TECs) are particularly crucial at multiple stages of T cell development: T cell commitment, positive selection and negative selection. However, the function of TECs in the thymus remains incompletely understood. In the article, we provide a method to isolate TEC subsets from fresh mouse thymus using a combination of mechanical disruption and enzymatic digestion. The method allows thymic stromal cells and thymocytes to be efficiently released from cell-cell and cell-extracellular matrix connections and to form a single-cell suspension. Using the isolated cells, multiparameter flow cytometry can be applied to identification and characterization of TECs and dendritic cells. Because TECs are a rare cell population in the thymus, we also describe an effective way to enrich and purify TECs by depleting thymocytes, the most abundant cell type in the thymus. Following the enrichment, cell sorting time can be decreased so that loss of cell viability can be minimized during purification of TECs. Purified cells are suitable for various downstream analyses like Real Time-PCR, Western blot and gene expression profiling. The protocol will promote research of TEC function and as well as the development of in vitro T cell reconstitution.

Here we describe an efficient method for isolation, identification, and purification of mouse thymic epithelial cells (TECs). The protocol can be utilized for studies of thymus function for normal T cell development, thymus dysfunction, and T cell reconstitution.

分离，鉴定和小鼠胸腺上皮细胞的分离纯化

The thymus is a vital organ for T lymphocyte development. Of thymic stromal cells, thymic epithelial cells (TECs) are particularly crucial at multiple ...

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels

This protocol describes noninvasive sampling of undisturbed upper airway mucosal lining fluid. It also details the extraction procedure used prior to the analysis of immune mediators in fluid eluates for the study of the airway topical immune signature, without the need for stimulation procedures (often used by other techniques). The mucosal lining fluid is sampled on a strip of filter paper placed at the anterior part of the inferior turbinate and left for 2 min of absorption. Analytes are eluted from the filter papers, and the extracted protein-based eluates are analyzed by an electrochemiluminescence-based immunoassay, allowing for the high-sensitivity quantification of low- and high-level analytes in the same sample. We measured the in vivo levels of 20 preselected immune mediators related to specific immune signaling pathways in the upper airway mucosa, but the technique is not limited to that specific panel or sampling site. The technique was first implemented in 7-year-old children from the Copenhagen Prospective Studies on Asthma in Childhood2000 (COPSAC2000) cohort with allergic rhinitis. It was thereafter used in the longitudinal COPSAC2010 birth cohort, sampled at 1 month, 2 years, and 6 years of age and at instances of acute respiratory symptoms. We successfully obtained and analyzed samples from 620 (89%) of 700 1-month-old children; a few samples were below the assay detection limit (reported as the median (Inter-Quartile Range (IQR)). The number of samples below the detection limit (i.e.&#160;from 0 to the set point for the lower limit of detection) for each mediator was 29 (7.25 - 119.5). This technique enables the quantification of the in vivo airway mucosal immune profile from birth, can be applied longitudinally, and can be applied to studies on the effect of genetics and early-life environmental exposures, pathophysiology, endotyping, and monitoring of respiratory diseases, and development and evaluation of novel therapeutics.

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels

This protocol describes a noninvasive technique for the sampling of undisturbed mucosal lining fluid from the upper airways. It can be used to perform the quantification of in vivo levels of protein mediators, such as cytokines and chemokines, in subjects of all ages.

黏膜衬里流体为体内上呼吸道免疫介质水平量化的无创性取样

This protocol describes noninvasive sampling of undisturbed upper airway mucosal lining fluid. It also details the extraction procedure used prior to the ...