저자는 원고의 자신의 검토를 위해 모리스 스미스와 Marja Talikka에게 감사의 말씀을 전합니다.

<ol>
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M., 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=Quantitative+assessment+of+biological+impact+using+transcriptomic+data+and+mechanistic+network+models.">Quantitative assessment of biological impact using transcriptomic data and mechanistic network models.</a> Toxicology and applied pharmacolog. 272, 863-878 (2013).</li><li>Teff, Z., Priel, Z., Gheber, L. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+forces+applied+by+cilia+depend+linearly+on+their+frequency+due+to+constant+geometry+of+the+effective+stroke.">The forces applied by cilia depend linearly on their frequency due to constant geometry of the effective stroke.</a> Biophysical journa. 94, 298-305 (2008).</li><li>Hilgendorf, 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=Caco-2+versus+Caco-2/HT29-MTX+co-cultured+cell+lines:+permeabilities+via+diffusion,+inside-+and+outside-directed+carrier-mediated+transport.">Caco-2 versus Caco-2/HT29-MTX co-cultured cell lines: permeabilities via diffusion, inside- and outside-directed carrier-mediated transport.</a> J Pharm Sc. 89, 63-75 (2000).</li><li>Sutto, Z., Conner, G. 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이 연구는 필립 모리스 인터내셔널 (Philip Morris International)에 의해 투자되었다.

여기서는 반복 CS 노출의 영향을 평가하는 인간의 Organotypic 기관지 비강 조직 모델의 적용 가능성을 보여 주었다. 동물 실험에 대한 대안으로, 노광 시스템의 수는 (예., Vitrocell, Cultex, ALICE 등) 시험관 내에서 에어로졸 노출 독성 평가를 위해 개발되었다. 이러한 노광 모듈도 본 연구 등 공수 오염 물질, 공기 중의 입자, 나노 입자의 독성 학적 평가를 위해 이용 될 수 있고, 우리는 더 큰 규모의 실험 간의 낮은 가변성을 허용 동시에 48 가지의 다른 샘플들까지 수용 할 수 Vitrocell 시스템을 사용 치료. 시험관 내에서 모든 에어로졸 노출, 조직 배양 오염의 위험은 저감 그 실험에 걸쳐 조직 배양의 취급에주의를 요구하는 주요 위험 남아있다. E 중 미량 천칭에 실시간 입자 침착을 측정xposure 실험은 노출 시스템에서 생성 된 CS 량은 기대에 부합하는 것을 모니터링 할 수 있습니다. 설정해서 온라인 측정을 정확하게 노광 전에 것은, 예 critial 때문에 마이크로 저울 (cm 2)의 영역의 차이, 또한 0으로 스케일을 설정하고, 측정 된 입자의 증착의 정확성 조직 배양 인서트 (0.33 cm 2), 우리는 배양 인서트의 영역에 최종 계산을 조정 된 미량 천칭에 증착 단지 33 %가 배양 인서트의 실제 증착을 반영한다. 꽉 접합 장벽 기능을 확인하고 상피 층의 중단을 평가하기 위해 봉사자의 측정은 우리가 여기에보고 구현하기 비교적 쉬운 과정이다. 비강 및 기관지 조직 모델 점액 생산 산재 배 세포를 포함하기 때문에, 정점 세척 봉사자 MEAS 전에 행할 필요하여 연산. 정점 세척 중요하므로 점액층의 존재 및 CS 노출의 영향 interferring 두께 캔 바이어스 티에르의 측정 가변성. 이 개념은 Hilgendorf 및 카코-2 세포의 투과성이 점액을 생산하는 술잔 세포 라인 HT29 (23)와 공동 배양에 의해 영향을 받았다있는 동료들에 의해보고 된 것과 일치한다. 바로 노출 전에 혀끝의 세척 CS에 대한 조직 반응을 방해 할 수 있기 때문에 점액 전에 봉사자 측정에 씻어해야합니다. 따라서, 측정은 노출 3 일 전에 수행 및 노출되기 직전되지 않습니다. 우리는 활동이 완만 한 CS 증가되었지만 CYP1A1 / CYP1B1 활동이 CS 노출 다음의 Organotypic 문화 모델에서 측정 될 수 있음을 보여 주었다. 이 약한 신호는 CYP1A1 / 1B1 기판의 장기간 배양에 의해 증폭 될 수있다 (예., 루시페린 - CEE), 예컨대 대24 시간 (데이터 미기재). 본 연구에서 CYP 활성 측정의 한계 중 하나는 효소 활성에 변화가 영향을받지 않도록 CYP 단백질 수준 또는 미래 연구를 위해 고려 될 수있는 세포 수로 정규화 결석 단백질 수준 또는 세포 수의 변화 중 하나에 의하여. 우리는 CS 노출은 비강과 기관지 조직 모델을 모두 제치고 섬모를 억제 보도했다. 비슷한 관찰 다양한 포유 동물 및 비 - 포유 동물 모델 (12)에서 수행 하였다. 섬모가 측정 치는 조직을 유사한 방식으로 처리하고 처리하도록 할 변화 매체가 구현되는 경우, 모든 샘플에 적용되어야한다, 예를 들면, 중요하다. Sutto와 동료들은 pH가 주파수 (24)를 때리고 포유 동물의 섬모에 영향을 보도했다. 따라서, 다른 compunds / 혼합물의 pH로 처리 한 세포 사이의 주파수를 치고 비교할 때조정은 모양체 박동 측정의 변동을 최소화하기 위해 고려되어야한다. 모양체 고해 주파수가 감소함에 따라 온도 강하 더욱이, 측정이 수행되는 온도는 중요하다. 본 연구에서 사용 된 온도, CO 2, 조습 갖추고 이러한 변화, 탑 스테이지 배양기에 의한 변동을 최소화. 그럼에도 불구하고, 우리는 CS 노출 후 기관지 조직에 주파수를 치는 섬모는 섬모 구타 노출 후 매우 방해 권리가 있음을 시사 매우 변수 (예., 하나 삽입 증가하고 다른 삽입 감소)이라고 관찰했다. 대조적으로, 우리는 비강 조직의 반응이 더 민감하고 일관성이 있음을 시사 CS 노광 후의 비강 조직에서 측정 모양체 비팅 주파수의 유무를 관찰했다. 이 비강 조직으로 독을 제거하기 위해 낮은 용량을 가지고 있음을 보여주는 이전의 출판물과 일치한다기관지 (25)와 비교. 마지막으로, 우리는 CS에 노출의 Organotypic의 기관지와 코 조직 모델에서 프로파일 유전자 발현이 생체 이물 대사에 CS의 영향을 설명 할 수 있음을 보여 주었다. 이전 출판 (15)에 자세히 설명한 바와 같이 흥미롭게도, CS에 노출 체외 모델에서 관찰의 Organotypic의 기관지에서 생체 이물 대사 변경과 코는 흡연자의 생체 내 상황의 유사. 유전자 발현 분석을 위해, 로봇 기기를 사용하면 높은 처리량 분석을 가능하게한다. 또한, 자동 핸들링 로봇은 상기 유전자 발현 결과의 일관성 및 정확성을 증가시킨다. 그럼에도 불구하고, 조직 샘플의 신속한 수집 RNA 추출 중에 RNA의 분해를 방지하는 것이 중요했다. RNA 프로세싱 및 여기서 설명 transcriptomic 접근법은 또한 생체 조직 샘플에 적용될 수있다.

Lungs are directly and constantly exposed to inhaled air that may contain diverse toxicants such as pollutants and constituents of cigarette smoke (CS). Studying the impact of exposure to those toxicants on respiratory tissues is most informative when done in a manner that resembles in vivo exposure. Compared with the classical 2D immersed cell cultures (e.g., normal human bronchial epithelial cells (NHBE)), 3D organotypic tissue models better recapitulate the morphological, physiological, and molecular aspects of the human airway epithelium in vivo1,2: the 3D tissue models contain the diversity of the cell types observed in vivo, including differentiated epithelial cells, ciliated and non-ciliated cells, goblet cells, and basal cells. They have functional tight junctions and exhibit a mucociliary phenotype 1-3. Moreover, the cultures can be grown on a permeable porous membrane, in an air-liquid interface, allowing a direct exposure to aerosol at the apical side (whereas the basolateral side is immersed in culture medium) 3-5. Dvorak and colleagues reported that gene expression profiles of bronchial tissue models were similar to those obtained from human bronchial brushings 3. In addition, Mathis and colleagues showed that the responses of these tissue models to CS were similar to the differences observed between bronchial epithelial cells obtained from smokers and cells obtained from non-smokers 6. Finally, because the bronchial tissue models could be cultured for up to several months 4,5, they could potentially be used to examine the effects of long-term exposure of test items. 
Cytotoxicity assessments are common parameters measured following chemical insults or to assess the toxicity of specific compounds or mixtures. For instance, membrane integrity can be measured by a luminescent assay and allows the measurement of a dose-dependent cytotoxic effect on the cell culture 7. However, to assess pathophysiological effects of compounds at subtoxic concentrations, other parameters should be measured. For example, tissue integrity determined using the transepithelial electrical resistance (TEER) assay ensures the functionality of tight junctions and monitors the disruption of the epithelial layer 8,9. Ciliary beating frequency also allows the measurement of CS-related effects on respiratory tissues. A normal beating frequency for the cilia lining bordering the upper and lower respiratory tract is important to protect against airway infections 10. Each of the ciliated columnar epithelial cells of the respiratory epithelium has 200-300 cilia beating at a particular frequency to eliminate infectious agents or inhaled particulate matter trapped in the mucus released by interspersed goblet cells 11. CS contains chemicals that may inhibit ciliary beating 12, leading to a reduced protection of the respiratory tract. This work shows that ciliary beating can be measured in organotypic tissue models. This approach allows assessment of whether epithelial cells exhibit their normal function in the organotypic tissue culture. CS also activates xenobiotic metabolism responses in the respiratory tract to metabolize tobacco smoke constituents 13. The activity of the phase I xenobiotic metabolism enzymes, CYP1A1 and CYP1B1, of the tissue models can be measured. Additionally, as previously reported, global gene expression can be measured in the organotypic bronchial tissue models 6,14,15. A transcriptomic data and network-based systems biology approach is leveraged to assess the impact of CS on xenobiotic metabolism 15. 
The methodologies used to expose organotypic 3D bronchial and nasal tissue models to mainstream CS using an in vitro exposure system and to measure the tissue responses to this exposure compared to fresh air exposure (control) are detailed here.

<table border="0" cellpadding="0" cellspacing="0" width="1545">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:356px;">Name of Material/ Equipment</td>
			<td style="width:367px;">Company</td>
			<td style="width:655px;">Catalog Number</td>
			<td style="width:167px;">Comments/Description</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">MucilAir-human fibroblasts-bronchia</td>
			<td>Epithelix S&#225;rl, Geneva, Switzerland</td>
			<td>http://www.epithelix.com/content/view/122/19/lang,en/</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MucilAir Culture Medium</td>
			<td>Epithelix S&#225;rl, Geneva, Switzerland</td>
			<td>http://www.epithelix.com/content/view/84/16/lang,en/</td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;">VITROCELL</td>
			<td>VITROCELL systems GmbH, Waldkirch, Germany</td>
			<td>http://www.vitrocell.com/index.php?Nav_Nummer=2&#38;R=</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3R4F reference cigarette</td>
			<td>University of Kentucky</td>
			<td>http://www2.ca.uky.edu/refcig/</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">30-port carousel smoking machine SM2000</td>
			<td>Philip Morris, Int.</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">CiliaMetrix camera and software</td>
			<td>La Haute &#201;cole de Gestion (HESGE), Geneva, Switzlerland</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Leica DMIL microscope&#160;</td>
			<td>Leica, Heerbrugg, Switzerland</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">LED light source</td>
			<td>Titan Tool Supplies, Buffalo, NY</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Chopstick Electrode STX-2</td>
			<td>World Precision Instruments</td>
			<td>http://www.wpiinc.com/products/physiology/stx2-chopstick-electrode-set-for-evom2/</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">EVOMXTM Epithelial Voltohmmeter&#160;</td>
			<td>World Precision Instruments</td>
			<td>http://www.wpiinc.com/products/physiology/evom2-evom2-epithelial-voltohmmeter-for-teer/</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Luciferin Detection Reagent&#160;</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MagNA Lyser Instrument&#160;</td>
			<td>Roche</td>
			<td>http://www.roche.com/products/product-details.htm?region=us&#38;type=product&#38;id=66</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">chloroform&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>http://www.sigmaaldrich.com/catalog/product/sial/288306?lang=en&#38;region=</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">QIAcube&#160;</td>
			<td>Qiagen</td>
			<td align="right">9001882</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">NanoDrop</td>
			<td>Thermo Scientific</td>
			<td>http://www.nanodrop.com/</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Agilent 2100 Bioanalyzer&#160;</td>
			<td>Agilent</td>
			<td>http://www.genomics.agilent.com/en/Bioanalyzer-System/2100-Bioanalyzer-Instruments/?cid=AG-PT-106</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Affymetrix GeneChip High throughput 3&#8217;IVT Express Kit</td>
			<td>Affymetrix</td>
			<td>http://www.affymetrix.com/catalog/prod370001/AFFY/High-Throughput-(HT)-Whole-Transcript-(WT)-Kit</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Scanner 3000 7G&#160;</td>
			<td>Affymetrix</td>
			<td>http://www.affymetrix.com/catalog/131503/AFFY/Scanner-3000-7G</td>
			<td></td>
		</tr>
	</tbody>
</table>

impact assessment of repeated exposure of organotypic 3d bronchial and nasal tissue culture models to whole cigarette smoke

Cigarette smoke (CS) has a major impact on lung biology and may result in the development of lung diseases such as chronic obstructive pulmonary disease or lung cancer. To understand the underlying mechanisms of disease development, it would be important to examine the impact of CS exposure directly on lung tissues. However, this approach is difficult to implement in epidemiological studies because lung tissue sampling is complex and invasive. Alternatively, tissue culture models can facilitate the assessment of exposure impacts on the lung tissue. Submerged 2D cell cultures, such as normal human bronchial epithelial (NHBE) cell cultures, have traditionally been used for this purpose. However, they cannot be exposed directly to smoke in a similar manner to the in vivo exposure situation. Recently developed 3D tissue culture models better reflect the in vivo situation because they can be cultured at the air-liquid interface (ALI). Their basal sides are immersed in the culture medium; whereas, their apical sides are exposed to air. Moreover, organotypic tissue cultures that contain different type of cells, better represent the physiology of the tissue in vivo. In this work, the utilization of an in vitro exposure system to expose human organotypic bronchial and nasal tissue models to mainstream CS is demonstrated. Ciliary beating frequency and the activity of cytochrome P450s (CYP) 1A1/1B1 were measured to assess functional impacts of CS on the tissues. Furthermore, to examine CS-induced alterations at the molecular level, gene expression profiles were generated from the tissues following exposure. A slight increase in CYP1A1/1B1 activity was observed in CS-exposed tissues compared with air-exposed tissues. A network-and transcriptomics-based systems biology approach was sufficiently robust to demonstrate CS-induced alterations of xenobiotic metabolism that were similar to those observed in the bronchial and nasal epithelial cells obtained from smokers.

아래에 설명 된 결과에서의 Organotypic 조직 건강, 금연로부터 격리 차 인간 상피 세포, 백인 기증자이었고, 섬유 아세포 (15)를 사용하여 재구성 하였다. 3D 기관지와 코 조직 모델 체외 기관지와 코의 Organotypic 모델에서 세포 수준 인간의 호흡기 상피 세포 (그림 2)에서 유사. CS 노출 비강의 Organotypic 기관지 조직 모델 반복적 공기 - 액체 계면에서 주류 CS에 노출 될 수있다. 여기에 도시 된 결과를 사용 흡연 노출 실험 절차는도 1에 도시되어있다. 섬모 박동의 기록 속눈썹 박동이 동영상에 도시 된 바와 같이 공기에 노출 된 조직에서 기록되었다. CS 노출은 섬모 박동 주파수의 감소와 관련이 : 주위에 관찰 강한 피크를노출 노출 된 가짜 및 이전 4 Hz로는 CS 노출 (그림 3) 이후 더 이상 관찰되지 않는다. 이 감소 된 주파수는 점액과 감염원 (22)를 제거 덜 효율적 치는 속눈썹을 만들 것입니다. 봉사자 및 CYP1A1 / 1B1 활동의 측정 봉사자는 조직이 여전히 기능에 마지막 노출 후 48 시간을 측정 하였다. 도 1에 도시 된 바와 같이, CYP1A1 / 1B1 활성은 노출 종료 후 48 시간을 측정 하였다. CS에 노출 된 조직에서 티에르 값이 크게 차이가 없었다 연기의 더 큰 세포 독성 효과가 있다는 것을 확인하는 공기에 노출 된 조직에 비해 이 농도. 48 시간 후 - 노출에서, 조직의 CYP1A1 / 1B1 활동은 약간 노출 (그림 4) 다음과 같은 조직의 방어 메커니즘의 완만 한 증가를 나타내는 증가 하였다. 유전자 발현 양상 및 네트워크 기반 시스템 양방향ology 접근법 생체이 대사의 변화에​​ CS 노출의 영향을 연구 조직을 48 시간 노출 후 시점에서 수집 하였다. 이어서, 마이크로 어레이 분석은 유전자 발현 프로필 및 CS- 공기에 노출 된 조직을 생성하기 위해 수행 하였다. 생체 이물 대사에 CS 노출의 영향은 유전자 발현 양상에서 활용 네트워크 기반 시스템 생물학 접근 방식을 사용하여 조사하고로 이전 (15) 보도했다. 네트워크 기반 시스템 생물학 접근 방식을 사용하여 생체 이물 대사 네트워크 모델의 백본 노드의 수준에서 CS 노출에 영향을 멋지게 (그림 5) 시험 관내 사이 및 생체 데이터 세트의 상관 관계를 보여줍니다. 대조적으로, 각각의 유전자 발현 변화의 차원에서, 열악한 상관 관계 관내 (대 비 흡연자가 흡연) 및 생체 내 (공기에 노출 된 노출 대 CS) 사이에서 관찰되었다. 의 Organotypic 기관지 조직 모델 CS의 반복 노출의 그림 1. 도식 절차 약어 :. CYP, 사이토 크롬 P450s; CS, 담배 연기, 봉사자, transepithelial 전기 저항. <img alt="그림 2" src="/files/ftp_upload/52325/52325fig2.jpg" /> 도 2의 Organotypic 비강 기관지 상피 조직 배양 모델. 만화 공기 - 액체 계면에서 기관지 (A)와 코 (B) 조직 배양 삽입물을 도시. 이전 15보고 체외 모델은 헤 마톡 실린 및 에오신 염색 된 세포의 꼭대기 층에 표시된 섬 모세포 (기관지에 대한 C, 비강 용 D)를 포함. 모델은 중요 아세포와 공동 배양 하였다<html> 성장 및 상피 세포의 분화를 위해 (화살표로 표시). 기도 혈통 마커의 얼룩 : 이전에 15보고 P63 (코 기관지에 대한 E, F)와 MUC5AC (기관지에 대한 G는 코에 대한 H)가 표시됩니다. <a href="https://www.jove.com/files/ftp_upload/52325/52325fig2large.jpg" target="_blank">이 그림의 더 큰 버전을 보려면 여기를 클릭하십시오.</a> <img alt="그림 3" src="/files/ftp_upload/52325/52325fig3.jpg" /> 그림 3. 섬모 치는 주파수. 섬모 박동 주파수 (CBF)는 전 및 노출 후 공기에 노출과 문화 측정 하였다. CBF는 CS 노출 후 본 낮게 나타났다 (두 삽입 대표 결과가 복제 1 (R1로 표시) 및 복제되는 2 (R2)). 광고 / 52325 / 52325fig4.jpg &quot;/&gt; 그림 4. CYP1A1 / CYP1B1 활동과 봉사자의 측정. 왼쪽 pannels는 기관지 (A)과 코 (B) 조직 모델에서 CYP1A1 / CYP1B1 활동을 나타냅니다. 오른쪽 패널은 기관지 (C)과 코 (D) 조직 모델 티에르 측정을 나타낸다. SD ± 수단이 표시됩니다. 요약 : CS, 담배 연기, CYP 시토크롬 P450; 봉사자, transepithelial 전기 저항; RLU, 상대 luminescense 장치. <img alt="그림 5" src="/files/ftp_upload/52325/52325fig5.jpg" /> 생체이 대사의 맥락에서 CS 노출의 영향 평가 그림 5. 네트워크 기반 시스템 생물학 방법. 유전자 발현 수준의 변화는 생체이 대사 네트워크 모델의 백본 노드의 활성화 (A)를 계산하는 데 사용 된 </<html> 강한&gt; 이전 게시 (15)에보고. 오른쪽 그림은 NPA 방식을 사용하여 &quot;차동 네트워크 백본 값」라고도 백본 노드의 정량의 개념을 도시한다. 청색 타원은 백본 노드의 활성을 나타낸다 (예., 기능 층) 및 녹색 공은 유전자의 발현을 나타낸다 (예., 전사 층). 의 Organotypic 기관지 조직에서 CS 노출의 영향 GSE16008 (노출 후의 48 시간에서 하 비갑개를 burshing에 의해 기관지와 코 점막 상피에 의해 수집 된 인간 기관지 상피에 흡연의 것과 비교 하였다 (체외은 공기에 노출이 대 CS는 노출) ) (생체, 흡연자 대 비 흡연자의) (B). 인 세트는, 유전자 발현의 상관 관계는 시험 관내 및 생체 내 사이에 데이터 셋 변경한다. 요약 : CS, 담배 연기, NPA 네트워크 교란 진폭.ove.com/files/ftp_upload/52325/52325fig5large.jpg &quot;대상 =&quot;_ 빈 &quot;&gt;이 그림의 더 큰 버전을 보려면 여기를 클릭하십시오.

Watch this Scientific Journal Video about Impact Assessment of Repeated Exposure of Organotypic 3D Bronchial and Nasal Tissue Culture Models to Whole Cigarette Smoke at JoVE.com

Impact Assessment of Repeated Exposure of Organotypic 3D Bronchial and Nasal Tissue Culture Models to Whole Cigarette Smoke

The aim of this protocol is to expose human organotypic 3D bronchial and nasal tissue models to mainstream cigarette smoke (CS) at the air-liquid interface. The impact of CS on the tissues is then investigated using a cytochrome P450 activity assay, a cilia beating measurement, and a systems biology approach.

전체 담배 연기에의 Organotypic 3D 기관지와 코 조직 문화 모델의 반복 노출의 영향 평가

Cigarette smoke (CS) has a major impact on lung biology and may result in the development of lung diseases such as chronic obstructive pulmonary disease ...

impact-assessment-repeated-exposure-organotypic-3d-bronchial-nasal

Nanyang Technological University

Research

JoVE Journal

Bioengineering

11.1K 조회수.  Philip Morris Products S.A.. The aim of this protocol is to expose human organotypic 3D bronchial and nasal tissue models to mainstream cigarette smoke (CS) at the air-liquid interface. The impact of CS on the tissues is then investigated using a cytochrome P450 activity assay, a cilia beating measurement, and a systems biology approach.

비디오: Impact Assessment of Repeated Exposure of Organotypic 3D Bronchial and Nasal Tissue Culture Models to Whole Cigarette Smoke

A Protocol for Detecting and Scavenging Gas-phase Free Radicals in Mainstream Cigarette Smoke

Cigarette smoking is associated with human cancers. It has been reported that most of the lung cancer deaths are caused by cigarette smoking 5,6,7,12. Although tobacco tars and related products in the particle phase of cigarette smoke are major causes of carcinogenic and mutagenic related diseases, cigarette smoke contains significant amounts of free radicals that are also considered as an important group of carcinogens9,10. Free radicals attack cell constituents by damaging protein structure, lipids and DNA sequences and increase the risks of developing various types of cancers. Inhaled radicals produce adducts that contribute to many of the negative health effects of tobacco smoke in the lung3. Studies have been conducted to reduce free radicals in cigarette smoke to decrease risks of the smoking-induced damage. It has been reported that haemoglobin and heme-containing compounds could partially scavenge nitric oxide, reactive oxidants and carcinogenic volatile nitrosocompounds of cigarette smoke4. A 'bio-filter' consisted of haemoglobin and activated carbon was used to scavenge the free radicals and to remove up to 90% of the free radicals from cigarette smoke14. However, due to the cost-ineffectiveness, it has not been successfully commercialized. Another study showed good scavenging efficiency of shikonin, a component of Chinese herbal medicine8. In the present study, we report a protocol for introducing common natural antioxidant extracts into the cigarette filter for scavenging gas phase free radicals in cigarette smoke and measurement of the scavenge effect on gas phase free radicals in mainstream cigarette smoke (MCS) using spin-trapping Electron Spin Resonance (ESR) Spectroscopy1,2,14. We showed high scavenging capacity of lycopene and grape seed extract which could point to their future application in cigarette filters. An important advantage of these prospective scavengers is that they can be obtained in large quantities from byproducts of tomato or wine industry respectively11,13

Spin-trapping ESR spectroscopy was used to study the effect of plant antioxidants lycopene, pycnogenol and grape seed extract on scavenging gas-phase free radicals in cigarette smoke.

메인 스트림 담배 연기에 자유 래디 칼을 감지하고 가스 단계 청소를위한 프로토콜

Cigarette smoking is associated with human cancers. It has been reported that most of the lung cancer deaths are caused by cigarette smoking 5,6,7,12.  ...

연구

생체공학

Electric Field-controlled Directed Migration of Neural Progenitor Cells in 2D and 3D Environments

Endogenous electric fields (EFs) occur naturally in vivo and play a critical role during tissue/organ development and regeneration, including that of the central nervous system1,2. These endogenous EFs are generated by cellular regulation of ionic transport combined with the electrical resistance of cells and tissues. It has been reported that applied EF treatment can promote functional repair of spinal cord injuries in animals and humans3,4. In particular, EF-directed cell migration has been demonstrated in a wide variety of cell types5,6, including neural progenitor cells (NPCs)7,8. Application of direct current (DC) EFs is not a commonly available technique in most laboratories. We have described detailed protocols for the application of DC EFs to cell and tissue cultures previously5,11. Here we present a video demonstration of standard methods based on a calculated field strength to set up 2D and 3D environments for NPCs, and to investigate cellular responses to EF stimulation in both single cell growth conditions in 2D, and the organotypic spinal cord slice in 3D. The spinal cordslice is an ideal recipient tissue for studying NPC ex vivo behaviours, post-transplantation, because the cytoarchitectonic tissue organization is well preserved within these cultures9,10. Additionally, this ex vivo model also allows procedures that are not technically feasible to track cells in vivo using time-lapse recording at the single cell level. It is critically essential to evaluate cell behaviours in not only a 2D environment, but also in a 3D organotypic condition which mimicks the in vivo environment. This system will allow high-resolution imaging using cover glass-based dishes in tissue or organ culture with 3D tracking of single cell migration in vitro and ex vivo and can be an intermediate step before moving onto in vivo paradigms.

This protocol demonstrates methods used to establish 2D and 3D environments in custom-designed electrotactic chambers, which can track cells in vivo/ex vivo using time-lapse recording at the single cell level, in order to investigate galvanotaxis/electrotaxis and other cellular responses to direct current (DC) electric fields (EFs).

2D 및 3D 환경에서 신경 전구 세포의 전기장 제어 감독 마이 그 레이션

Endogenous electric fields (EFs) occur naturally in vivo and play a critical role during tissue/organ development and regeneration, including that of the ...

Protocol for Relative Hydrodynamic Assessment of Tri-leaflet Polymer Valves

Limitations of currently available prosthetic valves, xenografts, and homografts have prompted a recent resurgence of developments in the area of tri-leaflet polymer valve prostheses. However, identification of a protocol for initial assessment of polymer valve hydrodynamic functionality is paramount during the early stages of the design process. Traditional in vitro pulse duplicator systems are not configured to accommodate flexible tri-leaflet materials; in addition, assessment of polymer valve functionality needs to be made in a relative context to native and prosthetic heart valves under identical test conditions so that variability in measurements from different instruments can be avoided. Accordingly, we conducted hydrodynamic assessment of i) native (n = 4, mean diameter, D = 20 mm), ii) bi-leaflet mechanical (n= 2, D = 23 mm) and iii) polymer valves (n = 5, D = 22 mm) via the use of a commercially available pulse duplicator system (ViVitro Labs Inc, Victoria, BC) that was modified to accommodate tri-leaflet valve geometries. Tri-leaflet silicone valves developed at the University of Florida comprised the polymer valve group. A mixture in the ratio of 35:65 glycerin to water was used to mimic blood physical properties. Instantaneous flow rate was measured at the interface of the left ventricle and aortic units while pressure was recorded at the ventricular and aortic positions. Bi-leaflet and native valve data from the literature was used to validate flow and pressure readings. The following hydrodynamic metrics were reported: forward flow pressure drop, aortic root mean square forward flow rate, aortic closing, leakage&#160;and regurgitant volume, transaortic closing, leakage, and total energy losses. Representative results indicated that hydrodynamic metrics from the three valve groups could be successfully obtained by incorporating a custom-built assembly into a commercially available pulse duplicator system and subsequently, objectively compared to provide insights on functional aspects of polymer valve design.

There has been renewed interest in developing polymer valves. Here, the objectives are to demonstrate the feasibility of modifying a commercial pulse duplicator to accommodate tri-leaflet geometries and to define a protocol to present polymer valve hydrodynamic data in comparison to native and prosthetic valve data collected under near-identical conditions.

트라이 전단지 폴리머 밸브의 상대 유체 역학 평가를위한 프로토콜

Limitations of currently available prosthetic valves, xenografts, and homografts have prompted a recent resurgence of developments in the area of ...

Tissue Engineering of a Human 3D in vitro Tumor Test System

Cancer is one of the leading causes of death worldwide. Current therapeutic strategies are predominantly developed in 2D culture systems, which inadequately reflect physiological conditions in vivo. Biological 3D matrices provide cells an environment in which cells can self-organize, allowing the study of tissue organization and cell differentiation. Such scaffolds can be seeded with a mixture of different cell types to study direct 3D cell-cell-interactions. To mimic the 3D complexity of cancer tumors, our group has developed a 3D in vitro tumor test system.	
	Our 3D tissue test system models the in vivo situation of malignant peripheral nerve sheath tumors (MPNSTs), which we established with our decellularized porcine jejunal segment derived biological vascularized scaffold (BioVaSc). In our model, we reseeded a modified BioVaSc matrix with primary fibroblasts, microvascular endothelial cells (mvECs) and the S462 tumor cell line. For static culture, the vascular structure of the BioVaSc is removed and the remaining scaffold is cut open on one side (Small Intestinal Submucosa SIS-Muc). The resulting matrix is then fixed between two metal rings (cell crowns).	
	Another option is to culture the cell-seeded SIS-Muc in a flow bioreactor system that exposes the cells to shear stress. Here, the bioreactor is connected to a peristaltic pump in a self-constructed incubator. A computer regulates the arterial oxygen and nutrient supply via parameters such as blood pressure, temperature, and flow rate. This setup allows for a dynamic culture with either pressure-regulated pulsatile or constant flow.	
	In this study, we could successfully establish both a static and dynamic 3D culture system for MPNSTs. The ability to model cancer tumors in a more natural 3D environment will enable the discovery, testing, and validation of future pharmaceuticals in a human-like model.

Tissue Engineering of a Human 3D in vitro Tumor Test System

Methods to create human 3D tumor tissues as test systems are described. These technologies are based on a decellularized Biological Vascularized Scaffold (BioVaSc), primary human cells and a tumor cell line, which can be cultured under static as well as under dynamic conditions in a flow bioreactor.

인간의 3 차원의 조직 공학<em&gt; 시험관</em&gt; 종양 테스트 시스템

Cancer is one of the leading causes of death worldwide.  Current therapeutic strategies are predominantly developed in 2D culture  systems, which ...

Sample Preparation Strategies for Mass Spectrometry Imaging of 3D Cell Culture Models

Three dimensional cell cultures are attractive models for biological research. They combine the flexibility and cost-effectiveness of cell culture with some of the spatial and molecular complexity of tissue. For example, many cell lines form 3D structures given appropriate in vitro conditions. Colon cancer cell lines form 3D cell culture spheroids, in vitro mimics of avascular tumor nodules. While immunohistochemistry and other classical imaging methods are popular for monitoring the distribution of specific analytes, mass spectrometric imaging examines the distribution of classes of molecules in an unbiased fashion. While MALDI mass spectrometric imaging was originally developed to interrogate samples obtained from humans or animal models, this report describes the analysis of in vitro three dimensional cell cultures, including improvements in sample preparation strategies. Herein is described methods for growth, harvesting, sectioning, washing, and analysis of 3D cell cultures via matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) imaging. Using colon carcinoma 3D cell cultures as a model system, this protocol demonstrates the ability to monitor analytes in an unbiased fashion across the 3D cell culture system with MALDI-MSI.

Immortalized cancer cell lines can be grown as 3D cell cultures, a valuable model for biological research. This protocol describes mass spectrometry imaging of 3D cell cultures, including improvements in the sample preparation platform. The goal of this protocol is to instruct users to prepare 3D cell cultures for mass spectrometry imaging analysis.

3 차원 세포 배양 모델의 질량 분석 이미징을위한 준비 전략 샘플

Three dimensional cell cultures are attractive models for biological research. They combine the flexibility and cost-effectiveness of cell culture with ...

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

The glycoprotein family of collagens represents the main structural proteins in the human body, and are key components of biomaterials used in modern tissue engineering. A technical bottleneck is the deposition of collagen in vitro, as it is notoriously slow, resulting in sub-optimal formation of connective tissue and subsequent tissue cohesion, particularly in skin models. Here, we describe a method which involves the addition of differentially-sized sucrose co-polymers to skin cultures to generate macromolecular crowding (MMC), which results in a dramatic enhancement of collagen deposition. Particularly, dermal fibroblasts deposited a significant amount of collagen I/IV/VII and fibronectin under MMC in comparison to controls.
The protocol also describes a method to decellularize crowded cell layers, exposing significant amounts of extracellular matrix (ECM) which were retained on the culture surface as evidenced by immunocytochemistry. Total matrix mass and distribution pattern was studied using interference reflection microscopy. Interestingly, fibroblasts, keratinocytes and co-cultures produced cell-derived matrices (CDM) of varying composition and morphology. CDM could be used as &#34;bio-scaffolds&#34; for secondary cell seeding, where the current use of coatings or scaffolds, typically from xenogenic animal sources, can be avoided, thus moving towards more clinically relevant applications.
In addition, this protocol describes the application of MMC during the submerged phase of a 3D-organotypic skin co-culture model which was sufficient to enhance ECM deposition in the dermo-epidermal junction (DEJ), in particular, collagen VII, the major component of anchoring fibrils. Electron microscopy confirmed the presence of anchoring fibrils in cultures developed with MMC, as compared to controls. This is significant as anchoring fibrils tether the dermis to the epidermis, hence, having a pre-formed mature DEJ may benefit skin graft recipients in terms of graft stability and overall wound healing. Furthermore, culture time was condensed from 5 weeks to 3 weeks to obtain a mature construct, when using MMC, reducing costs.

Improving 2D and 3D Skin In Vitro Models Using Macromolecular Crowding

We present a protocol to obtain cell-derived matrices rich in extracellular matrix proteins, using macromolecular crowders (MMC). In addition, we present a protocol which incorporates MMC in 3D organotypic skin co-culture generation, which reduces culture time while maintaining maturity of construct.

개선 2D 및 3D 스킨<em&gt; 체외</em거대 분자의 크라우 딩 사용&gt; 모델

The glycoprotein family of collagens represents the main structural proteins in the human body, and are key components of biomaterials used in modern ...

A Microfluidic Platform for High-throughput Single-cell Isolation and Culture

Studying the heterogeneity of single cells is crucial for many biological questions, but is technically difficult. Thus, there is a need for a simple, yet high-throughput, method to perform single-cell culture experiments. Here, we report a microfluidic chip-based strategy for high-efficiency single-cell isolation (~77%) and demonstrate its capability of performing long-term single-cell culture (up to 7 d) and cellular heterogeneity analysis using clonogenic assay. These applications were demonstrated with KT98 mouse neural stem cells, and A549 and MDA-MB-435 human cancer cells. High single-cell isolation efficiency and long-term culture capability are achieved by using different sizes of microwells on the top and bottom of the microfluidic channel. The small microwell array is designed for precisely isolating single-cells, and the large microwell array is used for single-cell clonal culture in the microfluidic chip. This microfluidic platform constitutes an attractive approach for single-cell culture applications, due to its flexibility of adjustable cell culture spaces for different culture strategies, without decreasing isolation efficiency.

Here, we present a protocol for isolating and culturing single cells with a microfluidic platform, which utilizes a new microwell design concept to allow for high-efficiency single cell isolation and long-term clonal culture.

높은 처리량 단일 세포의 분리 및 문화를위한 미세 유체 플랫폼

Studying the heterogeneity of single cells is crucial for many biological questions, but is technically difficult. Thus, there is a need for a simple, yet ...

Bioprinting of Cartilage and Skin Tissue Analogs Utilizing a Novel Passive Mixing Unit Technique for Bioink Precellularization

Bioprinting is a powerful technique for the rapid and reproducible fabrication of constructs for tissue engineering applications. In this study, both cartilage and skin analogs were fabricated after bioink pre-cellularization utilizing a novel passive mixing unit technique. This technique was developed with the aim to simplify the steps involved in the mixing of a cell suspension into a highly viscous bioink. The resolution of filaments deposited through bioprinting necessitates the assurance of uniformity in cell distribution prior to printing to avoid the deposition of regions without cells or retention of large cell clumps that can clog the needle. We demonstrate the ability to rapidly blend a cell suspension with a bioink prior to bioprinting of both cartilage and skin analogs. Both tissue analogs could be cultured for up to 4 weeks. Histological analysis demonstrated both cell viability and deposition of tissue specific extracellular matrix (ECM) markers such as glycosaminoglycans (GAGs) and collagen I respectively.

Cartilage and skin analogs were bioprinted using a nanocellulose-alginate based bioink. The bioinks were cellularized prior to printing via a single step passive mixing unit. The constructs were demonstrated to be uniformly cellularized, have high viability, and exhibit favorable markers of differentiation.

연골과 피부 조직 아날로그 소설 수동 Bioink Precellularization에 대 한 단위 기술 혼합을 이용 하 여 Bioprinting

Bioprinting is a powerful technique for the rapid and reproducible fabrication of constructs for tissue engineering applications. In this study, both ...

A Microcontroller Operated Device for the Generation of Liquid Extracts from Conventional Cigarette Smoke and Electronic Cigarette Aerosol

Electronic cigarettes are the most popular tobacco product among middle and high schoolers and are the most popular alternative tobacco product among adults. High quality, reproducible research on the consequences of electronic cigarette use is essential for understanding emerging public health concerns and crafting evidence based regulatory policy. While a growing number of papers discuss electronic cigarettes, there is little consistency in methods across groups and very little consensus on results. Here, we describe a programmable laboratory device that can be used to create extracts of conventional cigarette smoke and electronic cigarette aerosol. This protocol details instructions for the assembly and operation of said device, and demonstrates the use of the generated extract in two sample applications: an in vitro cell viability assay and gas-chromatography mass-spectrometry. This method provides a tool for making direct comparisons between conventional cigarettes and electronic cigarettes, and is an accessible entry point into electronic cigarette research.

Here, we describe a programmable laboratory device that can be used to create extracts of conventional cigarette smoke and electronic cigarette aerosol. This method provides a useful tool for making direct comparisons between conventional cigarettes and electronic cigarettes, and is an accessible entry point into electronic cigarette research.

전통적인 담배 연기와 전자 담배 연 무질에서 액체 추출의 세대에 대 한 장치를 운영 하는 마이크로컨트롤러

Electronic cigarettes are the most popular tobacco product among middle and high schoolers and are the most popular alternative tobacco product among ...

Handling and Assessment of Human Primary Prostate Organoid Culture

This paper describes a detailed protocol for three-dimensional (3D) culturing, handling, and evaluation of human primary prostate organoids. The process involves seeding of epithelial cells sparsely in a 3D matrix gel on a 96-well microplate with media changes to cultivate expansion into organoids. Morphology is then assessed by whole-well capturing of z-stack images. Compression of z-stacks creates a single in-focus image from which organoids are measured to quantify a variety of outputs, including circularity, roundness, and area.DNA, RNA, and protein can be collected from organoids recovered from the matrix gel. Cell populations of interest can be assessed by organoid dissociation and flow cytometry. Formalin-fixation-paraffin-embedding (FFPE) followed by sectioning is used for the histological assessment and antibody staining. Whole-mount immunofluorescent staining preserves organoid morphology and facilitates observation of protein localization in organoids in situ. Commercial assays that are traditionally used for 2D monolayer cells can be modified for 3D organoids. Used together, the techniques in this protocol provide a robust toolbox to quantify prostate organoid growth, morphologic characteristics, and expression of differentiation markers.

Here, we present a protocol to guide human primary prostate organoid handling then suggest endpoints to assess phenotype. Seeding, culture maintenance, recovery from matrix gel, morphologic quantification, embedding and sectioning, FFPE sectioning, whole-mount staining, and application of commercial assays are described.

처리 및 인간의 기본 전립선 Organoid 문화에 대 한 평가

This paper describes a detailed protocol for three-dimensional (3D) culturing, handling, and evaluation of human primary prostate organoids. The process ...

전체 담배 연기에의 Organotypic 3D 기관지와 코 조직 문화 모델의 반복 노출의 영향 평가

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