著者は、材料の彼らの現物出資のためのアレッサンドラ・モレッティとデニス・シャーデに感謝しています。私たちは、実験薬理学およびUKEの毒性の部門でのiPSとEHTワーキンググループの素晴らしいサポートを認めます。著者の作品はDZHK（循環器病研究のためのドイツ語センター）と教育のドイツの研究省（BMBF）、ドイツの研究財団（DFGエス88 / 12-1、HA 3423 / 5-1からの助成金によってサポートされています）、研究中の動物の交換洗練＆リダクション（NC3Rsクラック-ITの助成金35911から259146）のために英国のナショナルセンター、英国心臓財団RM / 30157分の13、欧州研究評議会（アドバンスト・グラントIndivuHeart）、ドイツ心臓財団そしてFreieウントHansestadtハンブルク。

<ol>
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W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chemically+defined+generation+of+human+cardiomyocytes.">Chemically defined generation of human cardiomyocytes.</a> Nat Methods. 11 (8), 855-860 (2014).</li><li>Kempf, H., Kropp, C., Olmer, R., Martin, U., Zweigerdt, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cardiac+differentiation+of+human+pluripotent+stem+cells+in+scalable+suspension+culture.">Cardiac differentiation of human pluripotent stem cells in scalable suspension culture.</a> Nat Protoc. 10 (9), 1345-1361 (2015).</li><li>Yang, X., Pabon, L., Murry, C. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Engineering+adolescence:+maturation+of+human+pluripotent+stem+cell-derived+cardiomyocytes.">Engineering adolescence: maturation of human pluripotent stem cell-derived cardiomyocytes.</a> Circ Res. 114 (3), 511-523 (2014).</li><li>Mannhardt, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+Engineered+Heart+Tissue:+Analysis+of+Contractile+Force.">Human Engineered Heart Tissue: Analysis of Contractile Force.</a> Stem Cell Reports. 7 (1), 29-42 (2016).</li><li>Eder, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+proarrhythmic+drugs+on+relaxation+time+and+beating+pattern+in+rat+engineered+heart+tissue.">Effects of proarrhythmic drugs on relaxation time and beating pattern in rat engineered heart tissue.</a> Bas Res Cardiol. 109 (6), 436 (2014).</li><li>St&#246;hr, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Contractile+abnormalities+and+altered+drug+response+in+engineered+heart+tissue+from+Mybpc3-targeted+knock-in+mice.">Contractile abnormalities and altered drug response in engineered heart tissue from Mybpc3-targeted knock-in mice.</a> J Mol Cell Cardiol. 63, 189-198 (2013).</li><li>Schaaf, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+Engineered+Heart+Tissue+as+a+Versatile+Tool+in+Basic+Research+and+Preclinical+Toxicology.">Human Engineered Heart Tissue as a Versatile Tool in Basic Research and Preclinical Toxicology.</a> PLoS One. 6 (10), e26397 (2011).</li><li>Hansen, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+a+drug+screening+platform+based+on+engineered+heart+tissue.">Development of a drug screening platform based on engineered heart tissue.</a> Circ Res. 107 (1), 35-44 (2010).</li><li>Frank, S., Zhang, M., Sch&#246;ler, H. 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N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Increased+afterload+induces+pathological+cardiac+hypertrophy:+a+new+in+vitro+model.">Increased afterload induces pathological cardiac hypertrophy: a new in vitro model.</a> Bas Res Cardiol. 107 (6), 307-323 (2012).</li><li>Jacob, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+Tyrosine+Kinase+Inhibitor-Mediated+Decline+in+Contractile+Force+in+Rat+Engineered+Heart+Tissue.">Analysis of Tyrosine Kinase Inhibitor-Mediated Decline in Contractile Force in Rat Engineered Heart Tissue.</a> PLoS One. 11 (2), e0145937 (2016).</li><li>Friedrich, F. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Evidence+for+FHL1+as+a+novel+disease+gene+for+isolated+hypertrophic+cardiomyopathy.">Evidence for FHL1 as a novel disease gene for isolated hypertrophic cardiomyopathy.</a> Hum Mol Genet. 21 (14), 3237-3254 (2012).</li><li>Crocini, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impact+of+ANKRD1+mutations+associated+with+hypertrophic+cardiomyopathy+on+contraction+parameters+of+engineered+heart+tissue.">Impact of ANKRD1 mutations associated with hypertrophic cardiomyopathy on contraction parameters of engineered heart tissue.</a> Bas Res Cardiol. 108 (3), 349 (2013).</li><li>Fiedler, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+Long+Noncoding+RNA-Based+Strategies+to+Modulate+Tissue+Vascularization.">Development of Long Noncoding RNA-Based Strategies to Modulate Tissue Vascularization.</a> J Am Coll Cardiol. 66 (18), 2005-2015 (2015).</li><li>van Meer, B. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Small+molecule+absorption+by+PDMS+in+the+context+of+drug+response+bioassays.">Small molecule absorption by PDMS in the context of drug response bioassays.</a> Biochem Biophysl Res Commun. , (2016).</li><li>Godier-Furn&#233;mont, A. F. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Physiologic+force-frequency+response+in+engineered+heart+muscle+by+electromechanical+stimulation.">Physiologic force-frequency response in engineered heart muscle by electromechanical stimulation.</a> Biomaterials. 60, 82-91 (2015).</li><li>Eng, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autonomous+beating+rate+adaptation+in+human+stem+cell-derived+cardiomyocytes.">Autonomous beating rate adaptation in human stem cell-derived cardiomyocytes.</a> Nat Commun. 7, 10312 (2016).</li><li>Huebsch, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Miniaturized+iPS-Cell-Derived+Cardiac+Muscles+for+Physiologically+Relevant+Drug+Response+Analyses.">Miniaturized iPS-Cell-Derived Cardiac Muscles for Physiologically Relevant Drug Response Analyses.</a> Sci Rep. 6 (24726), 1-12 (2016).</li><li>Masumoto, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+myocardial+regenerative+potential+of+three-dimensional+engineered+cardiac+tissues+composed+of+multiple+human+iPS+cell-derived+cardiovascular+cell+lineages.">The myocardial regenerative potential of three-dimensional engineered cardiac tissues composed of multiple human iPS cell-derived cardiovascular cell lineages.</a> Sci Rep. 6 (29933), 1-10 (2016).</li><li>Ravenscroft, S. M., Pointon, A., Williams, A. W., Cross, M. J., Sidaway, J. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cardiac+Non-myocyte+Cells+Show+Enhanced+Pharmacological+Function+Suggestive+of+Contractile+Maturity+in+Stem+Cell+Derived+Cardiomyocyte+Microtissues.">Cardiac Non-myocyte Cells Show Enhanced Pharmacological Function Suggestive of Contractile Maturity in Stem Cell Derived Cardiomyocyte Microtissues.</a> Toxicol Sci. 152 (1), 99-112 (2016).</li><li>Zhang, J. H., Chung, T. D. Y., Oldenbutg, K. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+Simple+Statistical+Parameter+for+Use+in+Evaluation+and+Validation+of+High+Throughput+Screening+Assays.">A Simple Statistical Parameter for Use in Evaluation and Validation of High Throughput Screening Assays.</a> J Biomol Screen. 4 (2), 67-73 (1999).</li><li>Vandenburgh, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Durg-screening+platform+based+on+the+contractility+of+tissue-engineered+muscle.">Durg-screening platform based on the contractility of tissue-engineered muscle.</a> Muscle Nerve. 37 (4), 438-447 (2008).</li></ol>

IM、TEとAHはEHT Technologies GmbH社、ドイツの共同設立者です。

エンジニア心臓組織は、心血管研究のツールボックスに貴重なオプションを提供しています。 24ウェルフォーマットにおけるEHTsは、疾患のモデリング8、14、薬剤の安全性スクリーニング7、8、10、11、15、または基本的な心臓血...

例えば、薬物誘発性QT延長症候群のような心臓の副作用は、過去数年間にわたり、市場の撤退につながっています。統計は、すべての引き出しの約45％が心血管系1上の不要な影響によるものであることを示しています。高価な発達過程および承認した後に、この薬の失敗は、製薬会社にとって最悪のシナリオです。研究開発部門は、したがって、早期に不要な心血管系への影響の検出に焦点を当てています。経済的、倫理的な問題、動物実験を削減し、新しいin vitroスクリーニングアッセイでそれらを置き換えるための努力のために進行中です。 確立されたアッセイのセットは、米国食品医薬品局（FDA）と欧州医薬品庁（EMA）催不整脈薬の効果2の前臨床評価のためのガイドラインに含まれています。の分化に続いて体細胞を再プログラミングする技術人間の人工多能性幹細胞（hiPSC）は、この研究分野3を押し上げました。現在では、 インビトロでヒト心筋細胞の新薬候補をスクリーニングする可能性を提供し、種間の違いの問題を回避できます。最近の心臓分化プロトコル4、 図5は、倫理的な懸念せずに心筋細胞の無制限の供給を提供します。しかし、収縮力の測定は、心筋細胞の生体パラメータの中で最も重要かつ最も特徴付けられ、十分に確立されていません。これは、成人心筋細胞と比較して、ヒト人工多能性幹細胞由来の心筋細胞（hiPSC-CM）の相対的な未熟6に関連しています。可能な進歩は、単一のセル7（操作心臓組織、EHT）から3次元心臓組織を操作することです。 EHTプロトコルは単一のマウスまたはヒト心筋8を埋め込むことに基づいています</SUP&gt;、2つの可撓性ポリジメチルシロキサン（PDMS）ポスト24ウェル形式で11の間にフィブリンヒドロゲル9、10。数日以内に心筋細胞を単一細胞として自発的に収縮し始めると、セルラーネットワークを形成し始めます。 7-10日後、組織全体の巨視的収縮が表示されます。このプロセスの間に細胞外マトリックスは、直径と長さの減少につながる、改造されています。 PDMSの曲げEHT結果の短縮は、連続負荷に開発EHTで心筋細胞を施す、残りの間にも投稿してください。 EHTsは数週間にわたってauxotonic筋肉の収縮を実行し続けます。ヒトEHTsは、薬物スクリーニングおよび疾患モデリング7のためのそれらの適合性を示す生理学的および薬理学的刺激に対する応答を示します。 本稿では、我々はgeneratiための堅牢かつ簡単なプロトコルを提示します人間EHT、およびhERGチャネル阻害剤の存在下での収縮パターンの濃度依存性の変化を自動的に収縮分析の上。

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>EHT analysis intrument</td>
			<td>EHT Technologies GmbH</td>
			<td>A0001</td>
			<td>Software is included</td>
		</tr>
		<tr>
			<td>EHT PDMS rack</td>
			<td>EHT Technologies GmbH</td>
			<td>C0001</td>
			<td></td>
		</tr>
		<tr>
			<td>EHT PTFE spacer</td>
			<td>EHT Technologies GmbH</td>
			<td>C0002</td>
			<td></td>
		</tr>
		<tr>
			<td>EHT electrode</td>
			<td>EHT Technologies GmbH</td>
			<td>P0001</td>
			<td></td>
		</tr>
		<tr>
			<td>EHT pacing adapter/cable</td>
			<td>EHT Technologies GmbH</td>
			<td>P0002</td>
			<td></td>
		</tr>
		<tr>
			<td>24-well-plate</td>
			<td>Nunc</td>
			<td>144530</td>
			<td></td>
		</tr>
		<tr>
			<td>6 well-cell culture plate</td>
			<td>Nunc</td>
			<td>140675</td>
			<td></td>
		</tr>
		<tr>
			<td>15 ml falcon tube, graduated&#160;</td>
			<td>Sarstedt</td>
			<td>62,554,502</td>
			<td></td>
		</tr>
		<tr>
			<td>Cell scraper</td>
			<td>Sarstedt</td>
			<td>831,830</td>
			<td></td>
		</tr>
		<tr>
			<td>Spinner flask</td>
			<td>Integra</td>
			<td>182 101</td>
			<td></td>
		</tr>
		<tr>
			<td>Stirrer Variomag/ Cimarec Biosystem Direct&#160;</td>
			<td>Thermo scientific</td>
			<td>70101</td>
			<td>Adjust rotor speed to 40 rpm</td>
		</tr>
		<tr>
			<td>T175 cell culture flask&#160;</td>
			<td>Sarstedt&#160;</td>
			<td>831,812,002</td>
			<td></td>
		</tr>
		<tr>
			<td>V-shaped sedimentation rack&#160;</td>
			<td>Custom made at UKE Hamburg</td>
			<td>na</td>
			<td></td>
		</tr>
		<tr>
			<td>10&#215; DMEM</td>
			<td>Gibco</td>
			<td>52100</td>
			<td></td>
		</tr>
		<tr>
			<td>1-Thioglycerol&#160;</td>
			<td>Sigma Aldrich</td>
			<td>M6145</td>
			<td></td>
		</tr>
		<tr>
			<td>2-Phospho-L-ascorbic acid trisodium salt</td>
			<td>Sigma Aldrich</td>
			<td>49752</td>
			<td></td>
		</tr>
		<tr>
			<td>Activin-A&#160;</td>
			<td>R&#38;D systems</td>
			<td>338-AC</td>
			<td></td>
		</tr>
		<tr>
			<td>Agarose&#160;</td>
			<td>Invitrogen</td>
			<td>15510-019</td>
			<td></td>
		</tr>
		<tr>
			<td>Aprotinin</td>
			<td>Sigma Aldrich</td>
			<td>A1153</td>
			<td></td>
		</tr>
		<tr>
			<td>Aqua ad injectabilia</td>
			<td>Baxter GmbH</td>
			<td>1428</td>
			<td></td>
		</tr>
		<tr>
			<td>B27 PLUS insulin&#160;</td>
			<td>Gibco</td>
			<td>17504-044</td>
			<td></td>
		</tr>
		<tr>
			<td>BMP-4</td>
			<td>R&#38;D systems</td>
			<td>314-BP</td>
			<td></td>
		</tr>
		<tr>
			<td>Collagenase II&#160;</td>
			<td>Worthington</td>
			<td>LS004176</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM</td>
			<td>Biochrom</td>
			<td>F0415</td>
			<td></td>
		</tr>
		<tr>
			<td>DMSO&#160;</td>
			<td>Sigma Aldrich</td>
			<td>D4540</td>
			<td></td>
		</tr>
		<tr>
			<td>DNase II, type V (from bovine spleen)</td>
			<td>Sigma&#160;</td>
			<td>D8764</td>
			<td></td>
		</tr>
		<tr>
			<td>Dorsomorphin&#160;</td>
			<td>abcam</td>
			<td>ab120843</td>
			<td></td>
		</tr>
		<tr>
			<td>EDTA&#160;</td>
			<td>Roth</td>
			<td>8043.2</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal calf serum</td>
			<td>Gibco</td>
			<td>10437028</td>
			<td></td>
		</tr>
		<tr>
			<td>FGF2</td>
			<td>Miltenyi Biotec</td>
			<td>130-104-921</td>
			<td></td>
		</tr>
		<tr>
			<td>Fibrinogen (bovine)</td>
			<td>Sigma Aldrich</td>
			<td>F8630</td>
			<td></td>
		</tr>
		<tr>
			<td>Geltrex&#160;</td>
			<td>Gibco</td>
			<td>A1413302</td>
			<td>For coating: 1:200 dilution</td>
		</tr>
		<tr>
			<td>HBSS w/o Ca2+/Mg2+&#160;</td>
			<td>Gibco</td>
			<td>14175-053</td>
			<td></td>
		</tr>
		<tr>
			<td>HEPES&#160;</td>
			<td>Roth</td>
			<td>9105.4</td>
			<td></td>
		</tr>
		<tr>
			<td>Horse serum</td>
			<td>Life technologies</td>
			<td>26050088</td>
			<td></td>
		</tr>
		<tr>
			<td>Human serum albumin&#160;</td>
			<td>Biological Industries</td>
			<td>05-720-1B</td>
			<td></td>
		</tr>
		<tr>
			<td>Insulin, human</td>
			<td>Sigma Aldrich</td>
			<td>I9278</td>
			<td></td>
		</tr>
		<tr>
			<td>L-Glutamin</td>
			<td>Gibco</td>
			<td>25030-024</td>
			<td></td>
		</tr>
		<tr>
			<td>Lipidmix&#160;</td>
			<td>Sigma Aldrich</td>
			<td>L5146</td>
			<td></td>
		</tr>
		<tr>
			<td>Matrigel</td>
			<td>BD Biosciences</td>
			<td>354234</td>
			<td>For EHT reconsitutionmix.</td>
		</tr>
		<tr>
			<td>N-Benzyl-p-Toluenesulfonamide</td>
			<td>TCI</td>
			<td>B3082-25G</td>
			<td></td>
		</tr>
		<tr>
			<td>PBS w/o MgCl2/CaCl2</td>
			<td>Biochrom</td>
			<td>14190</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin/Streptomycin</td>
			<td>Gibco</td>
			<td>15140</td>
			<td></td>
		</tr>
		<tr>
			<td>Pluronic F-127&#160;</td>
			<td>Sigma Aldrich</td>
			<td>P2443</td>
			<td></td>
		</tr>
		<tr>
			<td>Polyvinyl alcohol&#160;</td>
			<td>Sigma Aldrich</td>
			<td>P8136</td>
			<td></td>
		</tr>
		<tr>
			<td>RPMI 1640&#160;</td>
			<td>Gibco</td>
			<td>21875</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium selenite</td>
			<td>Sigma Aldrich</td>
			<td>S5261</td>
			<td></td>
		</tr>
		<tr>
			<td>TGF&#223;1</td>
			<td>Peprotech</td>
			<td>100-21</td>
			<td></td>
		</tr>
		<tr>
			<td>Thrombin</td>
			<td>Sigma Aldrich</td>
			<td>T7513</td>
			<td></td>
		</tr>
		<tr>
			<td>Transferrin&#160;</td>
			<td>Sigma Aldrich</td>
			<td>T8158</td>
			<td></td>
		</tr>
		<tr>
			<td>Y-27632</td>
			<td>Biorbyt</td>
			<td>orb6014</td>
			<td></td>
		</tr>
		<tr>
			<td>hiPSC</td>
			<td>Custom made at UKE hamburg</td>
			<td>na</td>
			<td></td>
		</tr>
		<tr>
			<td>iCell cardiomyocytes kit</td>
			<td>Cellular Dynamics International</td>
			<td>CMC-100-010-001</td>
			<td></td>
		</tr>
		<tr>
			<td>Pluricyte cardiomyocyte kit</td>
			<td>Pluriomics</td>
			<td>PCK-1.5</td>
			<td></td>
		</tr>
		<tr>
			<td>Cor.4U - HiPSC cardiomyocytes kit</td>
			<td>Axiogenesis AG</td>
			<td>Ax-C-HC02-FR3</td>
			<td></td>
		</tr>
		<tr>
			<td>Cellartis cardiomyocytes</td>
			<td>Takara Bio USA, Inc.</td>
			<td>Y10075</td>
			<td></td>
		</tr>
	</tbody>
</table>

automated contraction analysis of human engineered heart tissue for cardiac drug safety screening

心臓組織工学は、三次元力発生工学的組織を構成する技術が記載されています。基礎研究および前臨床医薬品開発におけるこれらの手順の実装のために、標準化された条件下での自動生成および解析のためのプロトコルを開発することが重要です。ここでは、異なる種（ラット、マウス、ヒト）の心筋細胞からエンジニア心臓組織（EHT）を生成する手法を提示します。技術は、24ウェルフォーマットで弾性ポリジメチルシロキサン（PDMS）ポスト間解離、心筋細胞を含むフィブリンゲルのアセンブリに依存しています。三次元の、力発生EHTsは、鋳造後2週間以内に構成します。この手順では、週に数百EHTsの生成を可能にし、技術的に心筋細胞の利用可能性によってのみ制限される（0.4〜1.0×10 6 / EHT）。 auxotonic筋収縮の評価はmechanで変性インキュベーションチャンバーで行われますiCalの24ウェルプレートのためのインターロックと、このチャンバの上に配置カメラ。ソフトウェアは、カメラが各EHTにXYZ軸システムに移動制御します。 EHT収縮は、自動図形認識アルゴリズムによって検出され、そして力がEHTの短縮及びPDMSポストの弾性性質および形状に基づいて算出されます。この手順は、標準化された無菌条件下でEHTの高い番号の自動分析が可能になります。心筋細胞の収縮に対する薬物効果の確実な検出は、心臓薬の開発や安全性薬理のために重要です。私たちは、それが心臓の薬の安全性スクリーニングのための有望なツールであることを示す、人間EHTシステムは、人間の心臓の収縮速度で薬物応答を複製することを、hERGチャネル阻害剤E-4031の例を、示しています。

EHTの心臓分化と準備 HiPSCは、成長因子低減基底膜マトリックス上に展開EDTA、一晩スピナーフラスコに形成された胚様体（EB）を用いて解離させました。 3日間、中胚葉誘導後、心臓分化はのWnt阻害剤で開始しました。分化プロトコルの〜17日後、拍動EBをコラゲナーゼタイプII（ 図1）を用いて単一細胞に分離し?...

Watch this Scientific Journal Video about Automated Contraction Analysis of Human Engineered Heart Tissue for Cardiac Drug Safety Screening at JoVE.com

Automated Contraction Analysis of Human Engineered Heart Tissue for Cardiac Drug Safety Screening

人工多能性幹細胞（hiPSC）が心筋細胞に由来からここでは、人間工学的心臓組織の生成を示しています。我々は、hERGチャネル阻害剤E-4031によって収縮力と収縮パターンの典型的な変化を分析するための方法を提示します。この方法は、心臓薬物スクリーニングのための堅牢性と適合性の高いレベルを示しています。

心臓医薬品安全性スクリーニングのための人間エンジニア心臓組織の自動収縮分析

Cardiac tissue engineering describes techniques to constitute three dimensional force-generating engineered tissues. For the implementation of these ...

automated-contraction-analysis-human-engineered-heart-tissue-for

Research

Education

JoVE Core

JoVE Journal

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Unit 1

Cardiovascular Drugs: Antiarrhythmic and Heart Failure Drugs

SCIENTISTS IN ACTION

12.6K ビュー.  University Medical Center Hamburg-Eppendorf and DZHK (German Center for Cardiovascular Research). 人工多能性幹細胞（hiPSC）が心筋細胞に由来からここでは、人間工学的心臓組織の生成を示しています。我々は、hERGチャネル阻害剤E-4031によって収縮力と収縮パターンの典型的な変化を分析するための方法を提示します。この方法は、心臓薬物スクリーニングのための堅牢性と適合性の高いレベルを示しています。 

ビデオ: Automated Contraction Analysis of Human Engineered Heart Tissue for Cardiac Drug Safety Screening

Bioluminescence Imaging for Assessment of Immune Responses Following Implantation of Engineered Heart Tissue (EHT)

Various techniques of cardiac tissue engineering have been pursued in the past decades including scaffolding strategies using either native or bioartificial scaffold materials, entrapment of cardiac myocytes in hydrogels such as fibrin or collagen and stacking of myocyte monolayers 1. These concepts aim at restoration of compromised cardiac function (e.g. after myocardial infarction) or as experimental models (e.g. predictive toxicology and substance screening or disease modelling). Precise monitoring of cell survival after implantation of engineered heart tissue (EHT) has now become possible using in-vivo bioluminescence imaging (BLI) techniques 2. Here we describe the generation of fibrin-based EHT from a transgenic rat strain with ubiquitous expression of firefly luciferase (ROSA/luciferase-LEW Tg; 3). Implantation is performed into the greater omentum of different rat strains to assess immune responses of the recipient organism following EHT implantation. Comparison of results generated by BLI and the Enzyme Linked Immuno Spot Technique (ELISPOT) confirm the usability of BLI for the assessment of immune responses.

Bioluminescence Imaging for Assessment of Immune Responses Following Implantation of Engineered Heart Tissue EHT

This video demonstrates the use of in vivo bioluminescence imaging to study immune responses after implantation of Engineered Heart Tissue (EHT) in rats.

エンジニア心臓組織の移植後免疫反応の評価（EHT）のための生物発光イメージング

Various techniques of cardiac tissue engineering have been pursued in the past decades including scaffolding strategies using either native or ...

生物工学

Self-reporting Scaffolds for 3-Dimensional Cell Culture

Culturing cells in 3D on appropriate scaffolds is thought to better mimic the in vivo microenvironment and increase cell-cell interactions. The resulting 3D cellular construct can often be more relevant to studying the molecular events and cell-cell interactions than similar experiments studied in 2D. To create effective 3D cultures with high cell viability throughout the scaffold the culture conditions such as oxygen and pH need to be carefully controlled as gradients in analyte concentration can exist throughout the 3D construct. Here we describe the methods of preparing biocompatible pH responsive sol-gel nanosensors and their incorporation into poly(lactic-co-glycolic acid) (PLGA) electrospun scaffolds along with their subsequent preparation for the culture of mammalian cells. The pH responsive scaffolds can be used as tools to determine microenvironmental pH within a 3D cellular construct. Furthermore, we detail the delivery of pH responsive nanosensors to the intracellular environment of mammalian cells whose growth was supported by electrospun PLGA scaffolds. The cytoplasmic location of the pH responsive nanosensors can be utilized to monitor intracellular pH (pHi) during ongoing experimentation.

Biocompatible pH responsive sol-gel nanosensors can be incorporated into poly(lactic-co-glycolic acid) (PLGA) electrospun scaffolds. The produced self-reporting scaffolds can be used for in&#160;situ monitoring of microenvironmental conditions whilst culturing cells upon the scaffold. This is beneficial as the 3D cellular construct can be monitored in real-time without disturbing the experiment.

3次元細胞培養のための自己申告足場

Culturing cells in 3D on appropriate scaffolds is thought to better mimic the in vivo microenvironment and increase cell-cell interactions. The resulting ...

Analysis of Tubular Membrane Networks in Cardiac Myocytes from Atria and Ventricles

In cardiac myocytes a complex network of membrane tubules - the transverse-axial tubule system (TATS) - controls deep intracellular signaling functions. While the outer surface membrane and associated TATS membrane components appear to be continuous, there are substantial differences in lipid and protein content. In ventricular myocytes (VMs), certain TATS components are highly abundant contributing to rectilinear tubule networks and regular branching 3D architectures. It is thought that peripheral TATS components propagate action potentials from the cell surface to thousands of remote intracellular sarcoendoplasmic reticulum (SER) membrane contact domains, thereby activating intracellular Ca2+ release units (CRUs). In contrast to VMs, the organization and functional role of TATS membranes in atrial myocytes (AMs) is significantly different and much less understood. Taken together, quantitative structural characterization of TATS membrane networks in healthy and diseased myocytes is an essential prerequisite towards better understanding of functional plasticity and pathophysiological reorganization. Here, we present a strategic combination of protocols for direct quantitative analysis of TATS membrane networks in living VMs and AMs. For this, we accompany primary cell isolations of mouse VMs and/or AMs with critical quality control steps and direct membrane staining protocols for fluorescence imaging of TATS membranes. Using an optimized workflow for confocal or superresolution TATS image processing, binarized and skeletonized data are generated for quantitative analysis of the TATS network and its components. Unlike previously published indirect regional aggregate image analysis strategies, our protocols enable direct characterization of specific components and derive complex physiological properties of TATS membrane networks in living myocytes with high throughput and open access software tools. In summary, the combined protocol strategy can be readily applied for quantitative TATS network studies during physiological myocyte adaptation or disease changes, comparison of different cardiac or skeletal muscle cell types, phenotyping of transgenic models, and pharmacological or therapeutic interventions.

In cardiac myocytes, tubular membrane structures form intracellular networks. We describe optimized protocols for i) isolation of myocytes from mouse heart including quality control, ii) live cell staining for state-of-the-art fluorescence microscopy, and iii) direct image analysis to quantify the component complexity and the plasticity of intracellular membrane networks.

心房と心室から心筋細胞における管状膜ネットワークの解析

In cardiac myocytes a complex network of membrane tubules - the transverse-axial tubule system (TATS) - controls deep intracellular signaling functions. ...

Hollow Fiber Bioreactors for In Vivo-like Mammalian Tissue Culture

Tissue culture has been used for over 100 years to study cells and responses ex vivo. The convention of this technique is the growth of anchorage dependent cells on the 2-dimensional surface of tissue culture plastic. More recently, there is a growing body of data demonstrating more in vivo-like behaviors of cells grown in 3-dimensional culture systems. This manuscript describes in detail the set-up and operation of a hollow fiber bioreactor system for the in vivo-like culture of mammalian cells. The hollow fiber bioreactor system delivers media to the cells in a manner akin to the delivery of blood through the capillary networks in vivo. The system is designed to fit onto the shelf of a standard CO2 incubator and is simple enough to be set-up by any competent cell biologist with a good understanding of aseptic technique. The systems utility is demonstrated by culturing the hepatocarcinoma cell line HepG2/C3A for 7 days. Further to this and in line with other published reports on the functionality of cells grown in 3-dimensional culture systems the cells are shown to possess increased albumin production (an important hepatic function) when compared to standard 2-dimensional tissue culture.

Hollow Fiber Bioreactors for In Vivo-like Mammalian Tissue Culture

The functional behavior of cells in culture can be improved by culturing in more in vivo-like 3-dimensional culture environments16-21. This manuscript describes the set-up and operation of a hollow fiber bioreactor system for in vivo-like mammalian tissue culture.

用中空糸バイオリアクター<em&gt;インビボ</em&gt;哺乳動物の組織培養様

Tissue culture has been used for over 100 years to study cells and responses ex vivo. The convention of this technique is the growth of anchorage ...

Construction of Defined Human Engineered Cardiac Tissues to Study Mechanisms of Cardiac Cell Therapy

Human cardiac tissue engineering can fundamentally impact therapeutic discovery through the development of new species-specific screening systems that replicate the biofidelity of three-dimensional native human myocardium, while also enabling a controlled level of biological complexity, and allowing non-destructive longitudinal monitoring of tissue contractile function. Initially, human engineered cardiac tissues (hECT) were created using the entire cell population obtained from directed differentiation of human pluripotent stem cells, which typically yielded less than 50% cardiomyocytes. However, to create reliable predictive models of human myocardium, and to elucidate mechanisms of heterocellular interaction, it is essential to accurately control the biological composition in engineered tissues. 
To address this limitation, we utilize live cell sorting for the cardiac surface marker SIRP&#945; and the fibroblast marker CD90 to create tissues containing a 3:1 ratio of these cell types, respectively, that are then mixed together and added to a collagen-based matrix solution. Resulting hECTs are, thus, completely defined in both their cellular and extracellular matrix composition.
Here we describe the construction of defined hECTs as a model system to understand mechanisms of cell-cell interactions in cell therapies, using an example of human bone marrow-derived mesenchymal stem cells (hMSC) that are currently being used in human clinical trials. The defined tissue composition is imperative to understand how the hMSCs may be interacting with the endogenous cardiac cell types to enhance tissue function. A bioreactor system is also described that simultaneously cultures six hECTs in parallel, permitting more efficient use of the cells after sorting.

This manuscript describes the creation of defined engineered cardiac tissues using surface marker expression and cell sorting. The defined tissues can then be used in a multi-tissue bioreactor to investigate mechanisms of cardiac cell therapy in order to provide a functional, yet controlled, model system of the human heart.

心臓細胞療法のメカニズムを研究するために定義されたヒューマン・エンジニア心臓組織の構築

Human cardiac tissue engineering can fundamentally impact therapeutic discovery through the development of new species-specific screening systems that ...

Neonatal Cardiac Scaffolds: Novel Matrices for Regenerative Studies

The only definitive therapy for end stage heart failure is orthotopic heart transplantation. Each year, it is estimated that more than 100,000 donor hearts are needed for cardiac transplantation procedures in the United States1-2. Due to the limited numbers of donors, only approximately 2,400 transplants are performed each year in the U.S.2. Numerous approaches, from cell therapy studies to implantation of mechanical assist devices, have been undertaken, either alone or in combination, in an attempt to coax the heart to repair itself or to rest the failing heart3. In spite of these efforts, ventricular assist devices are still largely used for the purpose of bridging to transplantation and the utility of cell therapies, while they hold some curative promise, is still limited to clinical trials. Additionally, direct xenotransplantation has been attempted but success has been limited due to immune rejection. Clearly, another strategy is required to produce additional organs for transplantation and, ideally, these organs would be autologous so as to avoid the complications associated with rejection and lifetime immunosuppression. Decellularization is a process of removing resident cells from tissues to expose the native extracellular matrix (ECM) or scaffold. Perfusion decellularization offers complete preservation of the three dimensional structure of the tissue, while leaving the bulk of the mechanical properties of the tissue intact4. These scaffolds can be utilized for repopulation with healthy cells to generate research models and, possibly, much needed organs for transplantation. We have exposed the scaffolds from neonatal mice (P3), known to retain remarkable cardiac regenerative capabilities,5-8 to detergent mediated decellularization and we repopulated these scaffolds with murine cardiac cells. These studies support the feasibility of engineering a neonatal heart construct. They further allow for the investigation as to whether the ECM of early postnatal hearts may harbor cues that will result in improved recellularization strategies.

In these studies, we provide methodology for novel, neonatal, murine cardiac scaffolds for use in regenerative studies.

新生児心臓足場：再生研究のための新しい行列

The only definitive therapy for end stage heart failure is orthotopic heart transplantation.  Each year, it is estimated that more than 100,000 donor ...

Use of High-Throughput Automated Microbioreactor System for Production of Model IgG1 in CHO Cells

Automated microscale bioreactors (15 mL) can be a useful tool for cell culture engineers. They facilitate the simultaneous execution of a wide variety of experimental conditions while minimizing potential process variability. Applications of this approach include: clone screening, temperature and pH shifts,&#160;media and supplement optimization. Furthermore, the small reactor volumes are conducive to large Design of Experiments that investigate a wide range of conditions. This allows upstream processes to be significantly optimized before scale-up where experimentation is more limited in scope due to time and economic constraints. Automated microscale bioreactor systems offer various advantages over traditional small scale cell culture units, such as shake flasks or spinner flasks. However, during pilot scale process development&#160;significant care must be taken to ensure that these advantages are realized. When run with care, the system can enable high level automation, can be programmed to run DOE&#39;s with a higher number of variables&#160;and can reduce sampling time when integrated with a nutrient analyzer or cell counter. Integration of the expert-derived heuristics presented here, with current automated microscale bioreactor experiments can minimize common pitfalls that hinder meaningful results. In the extreme, failure to adhere to the principles laid out here can lead to equipment damage that requires expensive repairs. Furthermore, the microbioreactor systems have small culture volumes&#160;making characterization of cell culture conditions difficult. The number and amount of samples taken in-process in batch mode culture is limited as operating volumes cannot fall below 10 mL. This method will discuss the benefits and drawbacks of microscale bioreactor systems.

A detailed protocol for the concurrent operation of 48 parallel cell cultures under varied conditions in a microbioreactor system is presented. Cell culture process, harvest and subsequent antibody titer analysis are described.

高スループットの自動モデル IgG1 CHO 細胞での生産のための Microbioreactor システム

Automated microscale bioreactors (15 mL) can be a useful tool for cell culture engineers. They facilitate the simultaneous execution of a wide variety of ...

Preparation of Mesh-Shaped Engineered Cardiac Tissues Derived from Human iPS Cells for In Vivo Myocardial Repair

The current protocol describes methods to generate scalable, mesh-shaped engineered cardiac tissues (ECTs) composed of cardiovascular cells derived from human induced pluripotent stem cells (hiPSCs), which are developed towards the goal of clinical use. HiPSC-derived cardiomyocytes, endothelial cells, and vascular mural cells are mixed with gel matrix and then poured into a polydimethylsiloxane (PDMS) tissue mold with rectangular internal staggered posts. By culture day 14 ECTs mature into a 1.5 cm x 1.5 cm mesh structure with 0.5 mm diameter myofiber bundles. Cardiomyocytes align to the long-axis of each bundle and spontaneously beat synchronously. This approach can be scaled up to a larger (3.0 cm x 3.0 cm) mesh ECT while preserving construct maturation and function. Thus, mesh-shaped ECTs generated from hiPSC-derived cardiac cells may be feasible for cardiac regeneration paradigms.

The present protocol generates mesh-shaped engineered cardiac tissues containing cardiovascular cells derived from human induced pluripotent stem cells to allow the investigation of cell implantation therapy for heart diseases.

生体内心筋修復用ヒトiPS細胞由来のメッシュ状の設計心臓組織の調製

The current protocol describes methods to generate scalable, mesh-shaped engineered cardiac tissues (ECTs) composed of cardiovascular cells derived from ...

Cardiac Spheroids as in vitro Bioengineered Heart Tissues to Study Human Heart Pathophysiology

Despite several advances in cardiac tissue engineering, one of the major challenges to overcome remains the generation of a fully functional vascular network comprising several levels of complexity to provide oxygen and nutrients within bioengineered heart tissues. Our laboratory has developed a three-dimensional in vitro model of the human heart, known as the "cardiac spheroid" or "CS". This presents biochemical, physiological, and pharmacological features typical of the human heart and is generated by co-culturing its three major cell types, such as cardiac myocytes, endothelial cells, and fibroblasts. Human induced pluripotent stem cells-derived cardiomyocytes (hiPSC-CMs or iCMs) are co-cultured at ratios approximating the ones found in vivo with human cardiac fibroblasts (HCFs) and human coronary artery endothelial cells (HCAECs) in hanging drop culture plates for three to four days. The confocal analysis of CSs stained with antibodies against cardiac Troponin T, CD31 and vimentin (markers for cardiac myocytes, endothelial cells and fibroblasts, respectively) shows that CSs present a complex endothelial cell network, resembling the native one found in the human heart. This is confirmed by the 3D rendering analysis of these confocal images. CSs also present extracellular matrix (ECM) proteins typical of the human heart, such as collagen type IV, laminin and fibronectin. Finally, CSs present a contractile activity measured as syncytial contractility closer to the one typical of the human heart compared to CSs that contain iCMs only. When treated with a cardiotoxic anti-cancer agent, such as doxorubicin (DOX, used to treat leukemia, lymphoma and breast cancer), the viability of DOX-treated CSs is significantly reduced at 10 &#181;M genetic and chemical inhibition of endothelial nitric oxide synthase, a downstream target of DOX in HCFs and HCAECs, reduced its toxicity in CSs. Given these unique features, CSs are currently used as in vitro models to study heart biochemistry, pathophysiology, and pharmacology.

This protocol aims to fabricate 3D cardiac spheroids (CSs) by co-culturing cells in hanging drops.&#160;Collagen-embedded CSs are treated with doxorubicin (DOX, a cardiotoxic agent) at physiological concentrations to model heart failure. In vitro testing using DOX-treated CSs may be used to identify novel therapies for heart failure patients.

ヒト心臓病態生理学を研究するインビトロバイオエンジニアリング心臓組織としての心臓スフェロイド

Despite several advances in cardiac tissue engineering, one of the major challenges to overcome remains the generation of a fully functional vascular ...

Developing 3D Organized Human Cardiac Tissue within a Microfluidic Platform

The leading cause of death worldwide persists as cardiovascular disease (CVD). However, modeling the physiological and biological complexity of the heart muscle, the myocardium, is notoriously difficult to accomplish in vitro. Mainly, obstacles lie in the need for human cardiomyocytes (CMs) that are either adult or exhibit adult-like phenotypes and can successfully replicate the myocardium&#39;s cellular complexity and intricate 3D architecture. Unfortunately, due to ethical concerns and lack of available primary patient-derived human cardiac tissue, combined with the minimal proliferation of CMs, the sourcing of viable human CMs has been a limiting step for cardiac tissue engineering. To this end, most research has transitioned toward cardiac differentiation of human induced pluripotent stem cells (hiPSCs) as the primary source of human CMs, resulting in the wide incorporation of hiPSC-CMs within in vitro assays for cardiac tissue modeling.
Here in this work, we demonstrate a protocol for developing a 3D mature stem cell-derived human cardiac tissue within a microfluidic device. We specifically explain and visually demonstrate the production of a 3D in vitro anisotropic cardiac tissue-on-a-chip model from hiPSC-derived CMs. We primarily describe a purification protocol to select for CMs, the co-culture of cells with a defined ratio via mixing CMs with human CFs (hCFs), and suspension of this co-culture within the collagen-based hydrogel. We further demonstrate the injection of the cell-laden hydrogel within our well-defined microfluidic device, embedded with staggered elliptical microposts that serve as surface topography to induce a high degree of alignment of the surrounding cells and the hydrogel matrix, mimicking the architecture of the native myocardium. We envision that the proposed 3D anisotropic cardiac tissue-on-chip model is suitable for fundamental biology studies, disease modeling, and, through its use as a screening tool, pharmaceutical testing.

The goal of this protocol is to explain and demonstrate the development of a three-dimensional (3D) microfluidic model of highly aligned human cardiac tissue, composed of stem cell-derived cardiomyocytes co-cultured with cardiac fibroblasts (CFs) within a biomimetic, collagen-based hydrogel, for applications in cardiac tissue engineering, drug screening, and disease modeling.

マイクロ流体プラットフォーム内での3D組織化ヒト心臓組織の開発

The leading cause of death worldwide persists as cardiovascular disease (CVD). However, modeling the physiological and biological complexity of the heart ...