Universität zu Köln

Jahn, Philipp, Karger, Rebecca Katharina, Khalaf, Shahab Soso, Hamad, Sarkawt ORCID: 0000-0002-5155-9467, Peinkofer, Gabriel, Sahito, Raja Ghazanfar Ali, Pieroth, Stephanie, Nitsche, Frank, Lu, Junqi, Derichsweiler, Daniel, Brockmeier, Konrad, Hescheler, Jurgen, Schmidt, Annette M. and Pfannkuche, Kurt (2022). Engineering of cardiac microtissues by microfluidic cell encapsulation in thermoshrinking non-crosslinked PNIPAAm gels. Biofabrication, 14 (3). BRISTOL: IOP Publishing Ltd. ISSN 1758-5090

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Abstract

Multicellular agglomerates in form of irregularly shaped or spherical clusters can recapitulate cell-cell interactions and are referred to as microtissues. Microtissues gain increasing attention in several fields including cardiovascular research. Cardiac microtissues are evolving as excellent model systems for drug testing in vitro (organ-on-a-chip), are used as tissue bricks in 3D printing processes and pave the way for improved cell replacement therapies in vivo. Microtissues are formed for example in hanging drop culture or specialized microwell plates; truly scalable methods are not yet available. In this study, a novel method of encapsulation of cells in poly-N-isopropylacrylamid (PNIPAAm) spheres is introduced. Murine induced pluripotent stem cell-derived cardiomyocytes and bone marrow-derived mesenchymal stem cells were encapsulated in PNIPAAm by raising the temperature of droplets formed in a microfluidics setup above the lower critical solute temperature (LCST) of 32 degrees C. PNIPAAM precipitates to a water-insoluble physically linked gel above the LCST and shrinks by the expulsion of water, thereby trapping the cells in a collapsing polymer network and increasing the cell density by one order of magnitude. Within 24 h, stable cardiac microtissues were first formed and later released from their polymer shell by washout of PNIPAAm at temperatures below the LCST. Rhythmically contracting microtissues showed homogenous cell distribution, age-dependent sarcomere organizations and action potential generation. The novel approach is applicable for microtissue formation from various cell types and can be implemented into scalable workflows.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Jahn, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Karger, Rebecca Katharina UNSPECIFIED UNSPECIFIED UNSPECIFIED Khalaf, Shahab Soso UNSPECIFIED UNSPECIFIED UNSPECIFIED Hamad, Sarkawt UNSPECIFIED orcid.org/0000-0002-5155-9467 UNSPECIFIED Peinkofer, Gabriel UNSPECIFIED UNSPECIFIED UNSPECIFIED Sahito, Raja Ghazanfar Ali UNSPECIFIED UNSPECIFIED UNSPECIFIED Pieroth, Stephanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Nitsche, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Lu, Junqi UNSPECIFIED UNSPECIFIED UNSPECIFIED Derichsweiler, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Brockmeier, Konrad UNSPECIFIED UNSPECIFIED UNSPECIFIED Hescheler, Jurgen UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pfannkuche, Kurt UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-669803
DOI:	10.1088/1758-5090/ac73b5
Journal or Publication Title:	Biofabrication
Volume:	14
Number:	3
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1758-5090
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PLURIPOTENT STEM-CELLS; DIFFERENTIATION; CARDIOMYOCYTES; MOUSE; ENGRAFTMENT Multiple languages Engineering, Biomedical; Materials Science, Biomaterials Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/66980