The authors thank the Fraunhofer ISC for the collaboration concerning the construction of the automated wounding device. The project was founded by Fraunhofer internal project &#8220;M&#228;rkte von &#220;bermorgen&#8221; (SkinHeal).

注：该协议被设计为生产24全层皮肤等同物。人皮肤成纤维细胞和表皮角质形成细胞从皮肤活检根据此前公布的协议隔离。21,22知情同意书事先获得的研究是通过对人体的朱利叶斯-马克西米利-维尔茨堡大学的研究机构伦理委员会（投182 / 10）。 1.生产真皮组件的<ol><li>溶解的胶原蛋白与0.1％乙酸至6毫克/毫升的最终浓度。用于凝胶和溶液，混合232.5毫升的2×DMEM，7.5毫升胎牛血清，7.5毫升的3M HEPES 2.5毫升硫酸软骨素（5毫克/毫升）。保持凝胶中和溶液和胶原溶液在冰上。计算500微升每个刀片/皮肤替代物凝胶。 注：由于凝胶和溶液将与胶原溶液编写，J两部分混合重新胶原蛋白双倍金额。 </li><li>将24插入到24孔板。 </li><li>在10毫升的DMEM，离心5分钟，在270×g离心悬浮的人真皮成纤维细胞（HDF），并计数细胞。在270中提取5分钟HDF的所需量（每500微升胶原凝胶5×10 4个细胞），并离心将细胞×g下。 </li><li>除去上清液，小心悬浮HDF 4毫升冷凝胶和溶液不会产生气泡。从该步骤中做出肯定的工作尽可能快，以避免胶原凝胶的过早凝固。 </li><li>悬浮用8ml的胶原溶液的溶液中。 </li><li>取胶原细胞混合物与多步移液器和在每个插入填迅速加入500μl混合物。孵育凝胶进行20分钟，在培养箱（37℃，5％的CO 2），以果冻的凝胶。 </li><li>浸没凝胶的2ml Dulbecco氏改良的Eagle培养基（DMEM）+ 10％胎牛血清每孔血清（FCS）的孵育它24小时在恒温箱（37℃，5％的CO 2）。 </li></ol> 2.加人表皮角化（HEK） <ol><li> 24小时后取出媒介。溶解用超纯水纤连蛋白的人类蛋白质为50微克/毫升的最终浓度。每张真皮相当于25微升的纤维连接蛋白的解决方案。孵育凝胶进行30分钟，在培养箱（37℃，5％的CO 2）。 </li><li>在此期间，悬浮HEK在10毫升KGM-2，并设置细胞浓度为1×10 6个细胞/ ml用KGM-2准备+ 5％FCS中。种子1×10 5个HEK每个凝胶。孵育凝胶在孵化45分钟（37℃，5％的CO 2），以使细胞粘附。 </li><li>浸没凝胶与KGM-2准备+ 5％FCS和培养他们在培养箱中（37℃，5％的CO 2）。 </li></ol> 3.文化的全层皮肤当量（FTSE） <ol><li>文化FTSE 6-7天降序FCS的浓度（5％，2％和0％FCS）中。与下一个较低的FCS浓度改变介质每2-3天。对于这一点，完全除去介质并加入1.6毫升新鲜培养基。 </li><li>第7天，彻底清除中。 注意：不要触摸FTSE表面吸管尖，而这样做。 </li><li>将每插入1井6孔板用无菌镊子。添加1.5毫升空运中每孔，保证不弄湿FTSE表面。改变培养基每2-3天为14天。 注意：介质的填充水平达到富时的弯液面。 </li></ol> 4.组织学分析<ol><li>固定和石蜡包埋的金融时报指数<ol><li>除去培养基，在新鲜的24孔板在RT传送插入和通过加入1.6毫升％多聚甲醛的4至每个孔固定组织孵育组织2小时。注意！多聚甲醛是有毒的，操纵下通风柜。转让富时到组织包埋盒。通过水洗除去残留固定剂和使用升序的乙醇浓度进行脱水的组织。 </li><li>划分皮肤相当于在中间垂直切割。将两片的石蜡填充金属底座模具切割面向下。添加组织盒上的模具作为背衬的顶部。 </li><li>切3-5微米片，它们漂浮在40℃水浴矫直，安装滑动到适合显微镜载玻片。干片彻底。 </li></ol></li><li>苏木精 - 伊红（H＆E）和免疫​​组织化学（IHC）染色<ol><li>地方滑进齿条和孵育1小时，在60℃。确保石蜡熔化。染色再水化H＆E片作为一个标准化的概述染色。 </li><li>对于H＆E染色准备4倍玻璃染色用试管二甲苯，3乙醇96％，2倍与70％乙醇，1个乙醇50％，4倍去离子水，1个苏木，1个盐酸-Ethanol（13.7毫升1M的HCl广告200毫升50％乙醇），1个标签的水，1×曙红和2x 2-丙醇（100毫升去离子水1克曙红）。 </li><li>地方滑入二甲苯I 10分钟和10分钟的二甲苯二deparaffinize和补充水分的幻灯片。浸滑动3倍的乙醇96％I，3倍于乙醇96％的二，3倍的乙醇为70％和3倍的乙醇50％。旋转在去离子水滑梯。为了区分苏木染料，在盐酸乙醇浸2倍。用去离子水冲洗。对于发蓝，地方滑5分钟，卡水。对于伊红染色，地点在滑伊红1分钟和去离子水清洗之后。进行脱水，浸幻灯片​​2倍的乙醇70％，2倍的乙醇96％，并放置5分钟在2-丙醇中我，5分钟在2-丙醇二，5分钟，二甲苯I和5分钟，二甲苯二。 H＆E染色后，细胞核被染成蓝色，细胞质和细胞外基质被染成红色。 </li><li>对于抗原修复，取出石蜡与二甲苯和补充水分切片进行染色。地方片在蒸汽烹调器，煮脱蜡和再水合的切片20分钟在预先加热的10mM柠檬酸盐缓冲液（pH 6）。 </li><li>在洗涤液的地方幻灯片（PBS缓冲液+ 0.5％吐温20）和圆形切片与液体驱蚊幻灯片记号笔或钻石笔。 </li><li>将幻灯片中的水分室。阻断内源性过氧化物酶，通过添加100微升3％的过氧化氢溶液在每个切片。注意！非常危险的情况下接触皮肤和眼睛。处理与个人防护装备。洗涤滑动在洗涤缓冲液中。 </li><li>应用第一抗体孵育1小时，在室温。洗涤滑动三次以洗涤缓冲液。从这里开始，样品应保持在黑暗中。 </li><li>用生物素 - 链霉检测系统用于检测特异性抗原 - 抗体结合的。 </li><li>对细胞核用苏木1分钟。脱水和安装幻灯片。 </li><li>使用逆显微镜图像样本。 </li></ol></li></ol> &lt;P类=“j​​ove_title”&gt; 5。损伤使用自动伤人设备的（AWD） <ol><li>通过消毒用70％乙醇及紫外线的工作区域准备AWD。确保所需大小的钻探头（ 例如，1毫米）附连。 </li><li>将皮肤替代物成为使用无菌镊子蒸压样品载板的指定区域。将样品承载板到下面的钻削头部的插座。 </li><li>使用控制软件如下设置伤人参数：旋转速度：15000转;穿透1.5毫米;推进：100赫兹。这些参数需要为每个样品类型单独定义。转移伤人参数的AWD。 </li><li>开始伤人的过程。从插槽中取出样品载板。转印负伤富回用于使用无菌镊子培养插入。 </li><li>继续受伤富时在培养箱培养（37℃，5％CO 2）的用于再生的调查。阿尔替换地，可使用的模型进行组织学分析在任何时间。 </li></ol>

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The authors have nothing to disclose.

体外细胞通常扩展在二维的细胞培养物，其中细胞粘附到塑料表面。然而，这些培养条件没有反映在其中细胞在体内生长的生理立体条件。根据三维的条件下，细胞可以形成天然的细胞 - 细胞和细胞 - 基质的附件和迁移在三维空间。特别是在皮肤伤口愈合的体内状况的相似性枢转以生成有意义数据，细 ​​胞迁移和基质产生的伤口愈合的关键要素。 为了...

皮肤是身体的最大器官。它创建的外部环境和内部器官之间的屏障。此外，在皮肤保护身体免受流体损失，环境影响，伤害和感染和有助于调节体温1。由于其暴露的位置，皮肤往往受机械，热或化学损伤。虽然皮肤通常能够自我修复，多个本地因素如感染，氧合，和静脉充分可导致受损的伤口愈合。伤口愈合也可以通过全身性因素，如肥胖，酒精中毒，吸烟，药物，营养和疾病，如糖 ​​尿病干扰。2 伤口愈合的过程中，可分为3个阶段：（i）该炎性阶段，（ii）所述增殖性和（ⅲ）重塑期。时伤害皮肤，复信号级联开始，从而导致伤口的闭合。3伤后，伤口出血并形成血块。成纤维细胞进入血液凝块并将其与随后被改造多年来新组织取代。 的生物学过程底层皮肤修复的当前理解是有限的。小动物及猪的模型已被用于研究伤口愈合。然而，这些结果不能被直接转移到由于物种特异性差异人类。除了 ​​这些体内模型中 ，伤口愈合的某些方面可以通过经由在体外单层培养的基础上永生化细胞系或原代细胞刮擦模拟伤口的情况进行研究。4这些刮擦模型高度标准化，但不充分反映复合体内生理学5除了二维模型，三维人体皮肤等同物已经开发了用于皮肤病学研究。这些车型的真皮部分是GEnerated使用各种支架包括脱细胞真皮，6胶原水凝胶，7,8-糖胺9或合成材料10采用这些皮肤当量的上皮-间充质相互作用11的作用下，再上皮，成纤维细胞和角化细胞并且所述的蜂窝串扰的不同生长因子的影响进行研究。此外，这些模型是有用的，以获得有关如何成纤维细胞迁移到受伤区域，以及如何趋化因子影响的组织再生的新知识。12 不仅产生的伤口愈合模型本身的是具有挑战性的，而且还建立了高度标准化伤口模型中是有问题的。常见的技巧，营造出伤口划痕试验，13烫伤，14纸带耐磨，15热损伤，吸16水泡，17液氮，18激光器，19 </SUP&gt;手术刀，18 meshers 6和活检拳。20这些方法大多有同样的缺陷。手动实施伤害是难以标准化和多次测试的重现。大小，形状和伤口的深入研究之间变化，从而削弱研究的数据的质量。利用激光对皮肤定义伤人可以比较容易地标准化，但导致一种情况模仿烧伤创面。由激光所施加的热可引起蛋白质变性，血小板聚集或血管收缩，这可导致坏死组织。 在另一种方法，我们开发了一个自动装置伤人（AWD），这使我们能够产生无菌条件下定义和精确的皮肤伤口。伤人的参数，如穿透深度和速度以及钻头的转速可以调节。在这项研究中，我们结合在内部开发的全层皮肤替代物的AWD（英尺SE），其是相当于由Gangatirkar 等人发表的协议。8皮肤等效的真皮层由人真皮成纤维细胞（HDF），它被嵌入在一个I型胶原凝胶。在真皮层，人表皮角化细胞（HEK）是种子。两周内，在空气-液体界面的HEK建立几个重要的细胞层和角质层组成的表皮。除了这种模式的产生，这项研究显示使用AWD的在富时创建定义和精确的伤口。

<table border="0" cellpadding="0" cellspacing="0" width="750">
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Name of Material/ Equipment</td>
			<td style="width:135px;">Company</td>
			<td style="width:119px;">Catalog Number</td>
			<td style="width:167px;">Comments/Description</td>
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			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
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			<td height="21" style="height:21px;width:329px;">Trypsin EDTA (1:250) 0.5 % in DPBS&#160;</td>
			<td style="width:135px;">PAA</td>
			<td style="width:119px;">L11-003</td>
			<td align="right">0.05%</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Dulbecco&#8217;s Phosphate Buffered Saline</td>
			<td style="width:135px;">Sigma</td>
			<td style="width:119px;">D8537</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Collagen (6 mg/ml in 0,1 % acetic acid)</td>
			<td style="width:135px;">Produced in house</td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Fibronectin Human Protein, Plasma (50 &#181;g/ml)</td>
			<td style="width:135px;">Life Technologies</td>
			<td style="width:119px;">33016-015</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Inserts</td>
			<td style="width:135px;">Nunc</td>
			<td align="right" style="width:119px;">140627</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">6 well plate&#160;</td>
			<td style="width:135px;">Nunc</td>
			<td align="right" style="width:119px;">140685</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">24 well plate</td>
			<td style="width:135px;">Nunc</td>
			<td align="right" style="width:119px;">142485</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Microscope slides</td>
			<td style="width:135px;">R. Langenbrinck</td>
			<td style="width:119px;">03-0070</td>
			<td></td>
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			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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			<td height="21" style="height:21px;width:329px;">Fibroblasts culturing (500 ml):</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">DMEM, high glucose</td>
			<td style="width:135px;">Life Technologies</td>
			<td style="width:119px;">11965-092</td>
			<td>89% (445 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Fetal bovine serum</td>
			<td style="width:135px;">Bio &#38; Sell</td>
			<td style="width:119px;">FCS.ADD.0500</td>
			<td>10% (50 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Penicillin-Streptomycin (10,000 U/mL)</td>
			<td style="width:135px;">Life Technologies</td>
			<td style="width:119px;">15140-122</td>
			<td>1% (5 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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			<td height="21" style="height:21px;width:329px;">Keratinozyten culture medium (500 ml):&#160;</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Keratinocyte Growth Medium 2</td>
			<td style="width:135px;">Promocell&#160;</td>
			<td style="width:119px;">C-20111</td>
			<td>89% (445 ml)</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Keratinocyte Growth Medium 2 SupplementPack</td>
			<td style="width:135px;">Promocell&#160;</td>
			<td style="width:119px;">C-39011</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Penicillin-Streptomycin (10,000 U/mL)</td>
			<td style="width:135px;">Life Technologies</td>
			<td style="width:119px;">15140-122</td>
			<td>1% (5 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Gel neutralization solution (250 ml):</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:329px;">Dulbecco&#8217;s Modified Eagle Medium, high Glucose Powder with L-Glutamine</td>
			<td style="width:135px;">PAA</td>
			<td style="width:119px;">G0001,3010</td>
			<td>93% (232,5 ml)</td>
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		<tr height="42">
			<td height="42" style="height:42px;width:329px;">Chondroitin sulfate sodium salt from shark cartilage</td>
			<td style="width:135px;">Sigma</td>
			<td style="width:119px;">C4384-1g</td>
			<td>1% (2,5 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Fetal bovine serum</td>
			<td style="width:135px;">Bio &#38; Sell</td>
			<td style="width:119px;">FCS.ADD.0500</td>
			<td>3% (7,5 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">HEPES</td>
			<td style="width:135px;">Sigma&#160;</td>
			<td style="width:119px;">H3375-1kg</td>
			<td>3% (7,5 ml)</td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
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			<td height="21" style="height:21px;width:329px;">Skin model submers medium (500ml):&#160;</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Keratinocyte Growth Medium 2</td>
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			<td style="width:119px;">C-20111</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Keratinocyte Growth Medium 2 SupplementPack</td>
			<td style="width:135px;">Promocell&#160;</td>
			<td style="width:119px;">C-39011</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Fetal calf serum</td>
			<td style="width:135px;">Bio &#38; Sell</td>
			<td style="width:119px;">FCS.ADD.0500</td>
			<td>5%-2% (25 ml-10 ml)&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Penicillin-Streptomycin (10,000 U/mL)</td>
			<td style="width:135px;">Life Technologies</td>
			<td style="width:119px;">15140-122</td>
			<td>1% (5 ml)</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Skin model air-liquid interface medium (500 ml):&#160;</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Keratinocyte Growth Medium 2</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:329px;">Keratinocyte Growth Medium 2 Supplement Pack</td>
			<td style="width:135px;">Promocell&#160;</td>
			<td style="width:119px;">C-39011</td>
			<td>adding only supplements: Insulin, Hydrocortisone, Epinephrine, Transferrin, CaCl2</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Penicillin-Streptomycin (10,000 U/mL)</td>
			<td style="width:135px;">Life Technologies</td>
			<td style="width:119px;">15140-122</td>
			<td>1% (5 ml)</td>
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		<tr height="25">
			<td height="25" style="height:25px;width:329px;">CaCl2 (300 mM)</td>
			<td style="width:135px;">Sigma&#160;</td>
			<td style="width:119px;">C7902-500g</td>
			<td>&#160;0,62% (3,1 ml)</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Histology:</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">IHC-Kit DCS SuperVision 2 HRP</td>
			<td style="width:135px;">DCS</td>
			<td style="width:119px;">PD000KIT</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Vimentin antibody</td>
			<td style="width:135px;">Abcam</td>
			<td>ab92547</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">CK14 antibody</td>
			<td style="width:135px;">Sigma&#160;</td>
			<td>HPA023040-100&#181;l</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">CK10 antibody</td>
			<td style="width:135px;">Dako</td>
			<td style="width:119px;">M7002</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Filaggrin antibody</td>
			<td style="width:135px;">Abcam</td>
			<td>ab81468</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;"></td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">H&#38;E staining</td>
			<td style="width:135px;"></td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Mayer&#180;s Haemalaun</td>
			<td style="width:135px;">AppliChem</td>
			<td style="width:119px;">A0884,2500</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Xylol</td>
			<td style="width:135px;">Sigma Aldrich</td>
			<td>296325-4X2L</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Ethanol</td>
			<td style="width:135px;">Sigma Aldrich</td>
			<td>32205-4X2.5L</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">HCl</td>
			<td style="width:135px;">Sigma Aldrich</td>
			<td>H1758-500ML</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Eosin</td>
			<td style="width:135px;">Sigma Aldrich</td>
			<td>E4009-5G</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">2-Propanolol</td>
			<td style="width:135px;">Sigma Aldrich</td>
			<td>I9516-500ML</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:329px;">Mounting Medium</td>
			<td style="width:135px;">Sigma Aldrich</td>
			<td>M1289-10ML</td>
			<td></td>
		</tr>
	</tbody>
</table>

generation of a three-dimensional full thickness skin equivalent and automated wounding

In vitro models are a cost effective and ethical alternative to study cutaneous wound healing processes. Moreover, by using human cells, these models reflect the human wound situation better than animal models. Although two-dimensional models are widely used to investigate processes such as cellular migration and proliferation, models that are more complex are required to gain a deeper knowledge about wound healing. Besides a suitable model system, the generation of precise and reproducible wounds is crucial to ensure comparable results between different test runs. In this study, the generation of a three-dimensional full thickness skin equivalent to study wound healing is shown. The dermal part of the models is comprised of human dermal fibroblast embedded in a rat-tail collagen type I hydrogel. Following the inoculation with human epidermal keratinocytes and consequent culture at the air-liquid interface, a multilayered epidermis is formed on top of the models. To study the wound healing process, we additionally developed an automated wounding device, which generates standardized wounds in a sterile atmosphere.

分离的HDF和HEK无论在形态和在典型的标记物的表达不同。高密度板呈现典型的梭形形态，而HEK形态可以由鹅卵石形态加以说明。使用它们对富时之前的细胞进行表征通过免疫组织化学染色（ 图1）。高密度板是积极的波形（ 图1A），标记为成纤维细胞。初级HEK高度表达早期分化蛋白细胞角蛋白14（ 图1B），但几乎没有迟到角质细胞分化蛋白细胞角蛋白10（ <stron...

Watch this Scientific Journal Video about Generation of a Three-dimensional Full Thickness Skin Equivalent and Automated Wounding at JoVE.com

Generation of a Three-dimensional Full Thickness Skin Equivalent and Automated Wounding

The goal of this protocol is to build up a three-dimensional full thickness skin equivalent, which resembles natural skin. With a specifically constructed automated wounding device, precise and reproducible wounds can be generated under maintenance of sterility.

三维全层皮肤的生成等效和自动伤人

In vitro models are a cost effective and ethical alternative to study cutaneous wound healing processes. Moreover, by using human cells, these models ...

generation-three-dimensional-full-thickness-skin-equivalent-automated

Research

JoVE Journal

Bioengineering

18.4K 次观看.  University Hospital Würzburg. The goal of this protocol is to build up a three-dimensional full thickness skin equivalent, which resembles natural skin. With a specifically constructed automated wounding device, precise and reproducible wounds can be generated under maintenance of sterility. 

视频: Generation of a Three-dimensional Full Thickness Skin Equivalent and Automated Wounding

The Three-Dimensional Human Skin Reconstruct Model: a Tool to Study Normal  Skin and Melanoma Progression

Most in vitro studies in experimental skin biology have been done in 2-dimensional (2D) monocultures, while accumulating evidence suggests that cells behave differently when they are grown within a 3D extra-cellular matrix and also interact with other cells (1-5). Mouse models have been broadly utilized to study tissue morphogenesis in vivo. However mouse and human skin have significant differences in cellular architecture and physiology, which makes it difficult to extrapolate mouse studies to humans. Since melanocytes in mouse skin are mostly localized in hair follicles, they have distinct biological properties from those of humans, which locate primarily at the basal layer of the epidermis. The recent development of 3D human skin reconstruct models has enabled the field to investigate cell-matrix and cell-cell interactions between different cell types. The reconstructs consist of a "dermis" with fibroblasts embedded in a collagen I matrix, an "epidermis", which is comprised of stratified, differentiated keratinocytes and a functional basement membrane, which separates epidermis from dermis. Collagen provides scaffolding, nutrient delivery, and potential for cell-to-cell interaction. The 3D skin models incorporating melanocytic cells recapitulate natural features of melanocyte homeostasis and melanoma progression in human skin. As in vivo, melanocytes in reconstructed skin are localized at the basement membrane interspersed with basal layer keratinocytes. Melanoma cells exhibit the same characteristics reflecting the original tumor stage (RGP, VGP and metastatic melanoma cells) in vivo. Recently, dermal stem cells have been identified in the human dermis (6). These multi-potent stem cells can migrate to the epidermis and differentiate to melanocytes.

In this report, we describe the three-dimensional skin reconstruct model which mimics human skin in architecture and composition. Melanocyte physiology, melanoma progression and the fate of dermal stem cells have been investigated using the skin reconstruct model. The model is also useful as a preclinical tool for drug assessment.

三维人体皮肤重建模型：一种工具来研究正常皮肤恶性黑色素瘤进展

Most in vitro studies in experimental skin biology have been done in 2-dimensional (2D) monocultures, while accumulating evidence suggests that cells ...

科研

生物工程

Planar and Three-Dimensional Printing of Conductive Inks

Printed electronics rely on low-cost, large-area fabrication routes to create flexible or multidimensional electronic, optoelectronic, and biomedical devices1-3. In this paper, we focus on one- (1D), two- (2D), and three-dimensional (3D) printing of conductive metallic inks in the form of flexible, stretchable, and spanning microelectrodes.
Direct-write assembly4,5 is a 1-to-3D printing technique that enables the fabrication of features ranging from simple lines to complex structures by the deposition of concentrated inks through fine nozzles (~0.1 - 250 &mu;m). This printing method consists of a computer-controlled 3-axis translation stage, an ink reservoir and nozzle, and 10x telescopic lens for visualization. Unlike inkjet printing, a droplet-based process, direct-write assembly involves the extrusion of ink filaments either in- or out-of-plane. The printed filaments typically conform to the nozzle size. Hence, microscale features (&lt; 1 &mu;m) can be patterned and assembled into larger arrays and multidimensional architectures.
In this paper, we first synthesize a highly concentrated silver nanoparticle ink for planar and 3D printing via direct-write assembly. Next, a standard protocol for printing microelectrodes in multidimensional motifs is demonstrated. Finally, applications of printed microelectrodes for electrically small antennas, solar cells, and light-emitting diodes are highlighted.

Planar and three-dimensional printing of conductive metallic inks is described. Our approach provides new avenues for fabricating printed electronic, optoelectronic, and biomedical devices in unusual layouts at the microscale.

平面和立体印刷的导电油墨

Printed electronics rely on low-cost, large-area fabrication routes to create flexible or multidimensional electronic, optoelectronic, and biomedical ...

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

The fluid-structure energy exchange process for normal speech has been studied extensively, but it is not well understood for pathological conditions. Polyps and nodules, which are geometric abnormalities that form on the medial surface of the vocal folds, can disrupt vocal fold dynamics and thus can have devastating consequences on a patient&#39;s ability to communicate. Our laboratory has reported particle image velocimetry (PIV) measurements, within an investigation of a model polyp located on the medial surface of an in&#160;vitro driven vocal fold model, which show that such a geometric abnormality considerably disrupts the glottal jet behavior. This flow field adjustment is a likely reason for the severe degradation of the vocal quality in patients with polyps. A more complete understanding of the formation and propagation of vortical structures from a geometric protuberance, such as a vocal fold polyp, and the resulting influence on the aerodynamic loadings that drive the vocal fold dynamics, is necessary for advancing the treatment of this pathological condition. The present investigation concerns the three-dimensional flow separation induced by a wall-mounted prolate hemispheroid with a 2:1 aspect ratio in cross flow, i.e. a model vocal fold polyp, using an oil-film visualization technique. Unsteady, three-dimensional flow separation and its impact of the wall pressure loading are examined using skin friction line visualization and wall pressure measurements.

Vocal fold polyps can disrupt vocal fold dynamics and thus can have devastating consequences on a patient&#39;s ability to communicate. Three-dimensional flow separation induced by a wall-mounted model polyp and its impact on the wall pressure loading are examined using particle image velocimetry, skin friction line visualization, and wall pressure measurements.

研究模型声乐折叠聚合物引起的三维流量分离

The fluid-structure energy exchange process for normal speech has been studied extensively, but it is not well understood for pathological conditions. ...

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo

Insufficient vascularization is considered to be one of the main factors limiting the clinical success of tissue-engineered constructs. In order to evaluate new strategies that aim at improving vascularization, reliable methods are required to make the in-growth of new blood vessels into bio-artificial scaffolds visible and quantify the results. Over the past couple of years, our group has introduced a full skin defect model that enables the direct visualization of blood vessels by transillumination and provides the possibility of quantification through digital segmentation. In this model, one surgically creates full skin defects in the back of mice and replaces them with the material tested. Molecules or cells of interest can also be incorporated in such materials to study their potential effect. After an observation time of one&#8217;s own choice, materials are explanted for evaluation. Bilateral wounds provide the possibility of making internal comparisons that minimize artifacts among individuals as well as of decreasing the number of animals needed for the study. In comparison to other approaches, our method offers a simple, reliable and cost effective analysis. We have implemented this model as a routine tool to perform high-resolution screening when testing vascularization of different biomaterials and bio-activation approaches.

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo

Vascularization is key to approaches in successful tissue engineering. Therefore, reliable technologies are required to evaluate the development of vascular networks in tissue-constructs. Here we present a simple and cost-effective method to visualize and quantify vascularization in vivo.

一个完整的皮肤缺损模型，以评估生物材料的血管化<em&gt;体内</em

Insufficient vascularization is considered to be one of the main factors limiting the clinical success of tissue-engineered constructs. In order to ...

Analysis of Cell Migration within a Three-dimensional Collagen Matrix

The ability to migrate is a hallmark of various cell types and plays a crucial role in several physiological processes, including&#160;embryonic development, wound healing, and immune responses. However, cell migration is also a key mechanism in cancer enabling these cancer cells to detach from the primary tumor to start metastatic spreading. Within the past years various cell migration assays have been developed to analyze the migratory behavior of different cell types. Because the locomotory behavior of cells markedly differs between a two-dimensional (2D) and three-dimensional (3D) environment it can be assumed that the analysis of the migration of cells that are embedded within a 3D environment would yield in more significant cell migration data. The advantage of the described 3D collagen matrix migration assay is that cells are embedded within a physiological 3D network of collagen fibers representing the major component of the extracellular matrix. Due to time-lapse video microscopy real cell migration is measured allowing the determination of several migration parameters as well as their alterations in response to pro-migratory factors or inhibitors. Various cell types could be analyzed using this technique, including lymphocytes/leukocytes, stem cells, and tumor cells. Likewise, also cell clusters or spheroids could be embedded within the collagen matrix concomitant with analysis of the emigration of single cells from the cell cluster/ spheroid into the collagen lattice. We conclude that the 3D collagen matrix migration assay is a versatile method to analyze the migration of cells within a physiological-like 3D environment.

Cell migration is a biological phenomenon that is involved in a plethora of physiological, such as wound healing and immune responses, and pathophysiological processes, like cancer. The 3D-collagen matrix migration assay is a versatile tool to analyze the migratory properties of different cell types within in a 3D physiological-like environment.

在一个三维胶原蛋白矩阵分析细胞迁移

The ability to migrate is a hallmark of various cell types and plays a crucial role in several physiological processes, including&#160;embryonic ...

Engineering Three-dimensional Epithelial Tissues Embedded within Extracellular Matrix

The architecture of branched organs such as the lungs, kidneys, and mammary glands arises through the developmental process of branching morphogenesis, which is regulated by a variety of soluble and physical signals in the microenvironment. Described here is a method created to study the process of branching morphogenesis by forming engineered three-dimensional (3D) epithelial tissues of defined shape and size that are completely embedded within an extracellular matrix (ECM). This method enables the formation of arrays of identical tissues and enables the control of a variety of environmental factors, including tissue geometry, spacing, and ECM composition. This method can also be combined with widely used techniques such as traction force microscopy (TFM) to gain more information about the interactions between cells and their surrounding ECM. The protocol can be used to investigate a variety of cell and tissue processes beyond branching morphogenesis, including cancer invasion.

This manuscript describes a soft lithography-based technique to engineer uniform arrays of three-dimensional (3D) epithelial tissues of defined geometry surrounded by extracellular matrix. This method is amenable to a wide variety of cell types and experimental contexts and allows for high-throughput screening of identical replicates.

工程三维上皮组织细胞外基质中嵌入

The architecture of branched organs such as the lungs, kidneys, and mammary glands arises through the developmental process of branching morphogenesis, ...

Three-dimensional Printing of Thermoplastic Materials to Create Automated Syringe Pumps with Feedback Control for Microfluidic Applications

Microfluidics has become a critical tool in research across the biological, chemical, and physical sciences. One important component of microfluidic experimentation is a stable fluid handling system capable of accurately providing an inlet flow rate or inlet pressure. Here, we have developed a syringe pump system capable of controlling and regulating the inlet fluid pressure delivered to a microfluidic device. This system was designed using low-cost materials and additive manufacturing principles, leveraging three-dimensional (3D) printing of thermoplastic materials and off-the-shelf components whenever possible. This system is composed of three main components: a syringe pump, a pressure transducer, and a programmable microcontroller. Within this paper, we detail a set of protocols for fabricating, assembling, and programming this syringe pump system. Furthermore, we have included representative results that demonstrate high-fidelity, feedback control of inlet pressure using this system. We expect this protocol will allow researchers to fabricate low-cost syringe pump systems, lowering the entry barrier for the use of microfluidics in biomedical, chemical, and materials research.

Here we present a protocol to construct a pressure-controlled syringe pump to be used in microfluidic applications. This syringe pump is made from an&#160;additively manufactured body, off-the-shelf hardware, and open-source electronics. The resulting system is low-cost, straightforward to build, and delivers well-regulated fluid flow to enable rapid microfluidic research.

三维热塑性材料的印刷, 以创建自动注射器泵的反馈控制微流控应用

Microfluidics has become a critical tool in research across the biological, chemical, and physical sciences. One important component of microfluidic ...

Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale

A three-dimensional human epidermis model reconstructed from neonatal primary keratinocytes is presented. Herein, a protocol for the cultivation process and the characterization of the model is described. Neonatal primary keratinocytes are grown submerged on permeable polycarbonate inserts and lifted to the air-liquid interface three days after seeding. After fourteen days of stimulation with defined growth factors and ascorbic acid in high calcium culture medium, the model is fully differentiated. Histological analysis revealed a completely stratified epidermis, mimicking the morphology of native human skin. To characterize the model and its barrier functions, protein levels and localization specific for early-stage keratinocyte differentiation (i.e., keratin 10), late-stage differentiation (i.e., involucrin, loricrin, and filaggrin) and tissue adhesion (i.e., desmoglein 1), were assessed by immunofluorescence. The tissue barrier integrity was further evaluated by measuring transepithelial electrical resistance. Reconstructed human epidermis was responsive to proinflammatory stimuli (i.e., lipopolysaccharide and tumor necrosis factor alpha), leading to increased cytokine release (i.e., interleukin 1 alpha and interleukin 8). This protocol represents a straightforward and reproducible in vitro method to cultivate reconstructed human epidermis as a tool to assess environmental effects and a broad range of skin-related studies.

This protocol describes a straightforward method to cultivate three-dimensional reconstituted human epidermis in a reproducible and robust manner. Additionally, it characterizes the structure-function relationship of the epidermal barrier model. The biological responses of the reconstituted human epidermis upon proinflammatory stimuli are also presented.

大规模培育三维重建人类表皮

A three-dimensional human epidermis model reconstructed from neonatal primary keratinocytes is presented. Herein, a protocol for the cultivation process ...

Generation of a Simplified Three-Dimensional Skin-on-a-chip Model in a Micromachined Microfluidic Platform

This work presents a new, cost-effective, and reliable microfluidic platform with the potential to generate complex multilayered tissues. As a proof of concept, a simplified and undifferentiated human skin containing a dermal (stromal) and an epidermal (epithelial) compartment has been modelled. To accomplish this, a versatile and robust, vinyl-based device divided into two chambers has been developed, overcoming some of the drawbacks present in microfluidic devices based on polydimethylsiloxane (PDMS) for biomedical applications, such as the use of expensive and specialized equipment or the absorption of small, hydrophobic molecules and proteins. Moreover, a new method based on parallel flow was developed, enabling the in situ deposition of both the dermal and epidermal compartments. The skin construct consists of a fibrin matrix containing human primary fibroblasts and a monolayer of immortalized keratinocytes seeded on top, which is subsequently maintained under dynamic culture conditions. This new microfluidic platform opens the possibility to model human skin diseases and extrapolate the method to generate other complex tissues.

Here, we present a protocol to generate a three-dimensional simplified and undifferentiated skin model using a micromachined microfluidic platform. A parallel flow approach allows the in situ deposition of a dermal compartment for the seeding of epithelial cells on top, all controlled by syringe pumps.

在微加工微流体平台中生成简化的三维芯片皮肤模型

This work presents a new, cost-effective, and reliable microfluidic platform with the potential to generate complex multilayered tissues. As a proof of ...

Generation of Multicue Cellular Microenvironments by UV-Photopatterning of Three-Dimensional Cell Culture Substrates

The extracellular matrix is an important regulator of cell function. Environmental cues existing in the cellular microenvironment, such as ligand distribution and tissue geometry, have been increasingly shown to play critical roles in governing cell phenotype and behavior. However, these environmental cues and their effects on cells are often studied separately using in vitro platforms that isolate individual cues, a strategy that heavily oversimplifies the complex in vivo situation of multiple cues. Engineering approaches can be particularly useful to bridge this gap, by developing experimental setups that capture the complexity of the in vivo microenvironment, yet retain the degree of precision and manipulability of in vitro systems.
This study highlights an approach combining ultraviolet (UV)-based protein patterning and lithography-based substrate microfabrication, which together enable high-throughput investigation into cell behaviors in multicue environments. By means of maskless UV-photopatterning, it is possible to create complex, adhesive protein distributions on three-dimensional (3D) cell culture substrates on chips that contain a variety of well-defined geometrical cues. The proposed technique can be employed for culture substrates made from different polymeric materials and combined with adhesive patterned areas of a broad range of proteins. With this approach, single cells, as well as monolayers, can be subjected to combinations of geometrical cues and contact guidance cues presented by the patterned substrates. Systematic research using combinations of chip materials, protein patterns, and cell types can thus provide fundamental insights into cellular responses to multicue environments.

Traditionally, cell culture is performed on planar substrates that poorly mimic the natural environment of cells in vivo. Here we describe a method to produce cell culture substrates with physiologically relevant curved geometries and micropatterned extracellular proteins, allowing systematic investigations into cellular sensing of these extracellular cues.