Engineering of cardiac microtissues by microfluidic cell encapsulation in thermoshrinking non-crosslinked PNIPAAm gels.

Autor:	Jahn P; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., Karger RK; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., Soso Khalaf S; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., Hamad S; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany.; Biology Department, Faculty of Science, Soran University, Soran, Kurdistan Region, Iraq., Peinkofer G; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., Sahito RGA; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., Pieroth S; Department of Chemistry, Physical Chemistry, University of Cologne, Cologne, Germany., Nitsche F; Cologne Biocenter, Institute of Zoology, General Ecology, University of Cologne, Cologne, Germany., Lu J; Department of Chemistry, Physical Chemistry, University of Cologne, Cologne, Germany., Derichsweiler D; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., Brockmeier K; Department of Pediatric Cardiology, University Hospital of Cologne, Cologne, Germany., Hescheler J; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany., M Schmidt A; Department of Chemistry, Physical Chemistry, University of Cologne, Cologne, Germany., Pfannkuche K; Center for Physiology and Pathophysiology, Institute for Neurophysiology, University of Cologne, Medical Faculty, Cologne, Germany.; Department of Pediatric Cardiology, University Hospital of Cologne, Cologne, Germany.; Marga-and-Walter-Boll Laboratory for Cardiac Tissue Engineering, University of Cologne, Cologne, Germany.; Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany.
Jazyk:	angličtina
Zdroj:	Biofabrication [Biofabrication] 2022 Jun 10; Vol. 14 (3). Date of Electronic Publication: 2022 Jun 10.
DOI:	10.1088/1758-5090/ac73b5
Abstrakt:	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 °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. (Creative Commons Attribution license.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu