Embryonic stem cells utilize reactive oxygen species as transducers of mechanical strain-induced cardiovascular differentiation

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Maike SchmelterHeinrich Sauer

Abstract

Growing stem cells are subjected to mechanical forces, which may initiate differentiation programs. Mechanical strain stimulated cardiovascular differentiation of mouse embryonic stem (ES) cells as evaluated by quantification of contracting cardiac foci and capillary areas, respectively. Mechanical strain rapidly elevated intracellular reactive oxygen species (ROS). After 24 h up-regulation of NADPH oxidase subunits p22-phox, p47-phox, p67-phox, and Nox-4 as well as Nox-1 and Nox-4 mRNA was observed. In parallel, mechanical strain increased hypoxia-inducible factor-1alpha (HIF-1alpha) and vascular endothelial growth factor (VEGF) mRNA and protein as well as MEF2C and GATA-4 mRNA, which are involved in cardiovascular development. Furthermore, phosphorylation of extracellular-regulated kinase 1,2 (ERK1,2), p38, and c-jun N-terminal kinase (c-Jun NH2-terminal kinase (JNK)) was observed. Stimulation of cardiovascular commitment, HIF-1alpha, VEGF, and MEF2C expression as well as MAPK activation were abolished by free radical scavengers, whereas GATA-4 expression was increased. Cardiomyogenesis was inhibited by the p38 inhibitor SB203580, the ERK1,2 inhibitor UO126, and the JNK inhibitor SP600125. Vasculogenesis/angiogenesis was blun...Continue Reading

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