High glucose condition limited the angiogenic/cardiogenic capacity of murine cardiac progenitor cells in in vitro and in vivo milieu.

Abstract

Murine c-kit+ cardiac cells were isolated and enriched by magnetic activated cell sorting technique. c-kit+ cells viability and colony-forming activity were evaluated by MTT and clonogenic assay. c-kit+ cells were exposed to endothelial, pericyte, and cardiomyocyte induction media containing 30mM glucose for 7days. We monitored the level of endothelial (VE-cadherin, CD31, and vWF), pericyte (NG2 , α-SMA, and PDGFR-β), and cardiomyocyte markers (cTnT) using flow cytometry, real-time Polymerase Chain Reaction (PCR), and Enzyme-Linked Immunosorbent Assay (ELISA) analyses. Ultrastructural changes were studied by transmission electron microscopy (TEM) in cells treated with 5-Azacytidine and 30mM glucose. Matrigel plug assay was performed to determine the angio/cardiogenic property of c-kit+ cells in a diabetic mouse model. Glucose of 30mM decreased c-kit+ cells viability and clonogenicity (P<0.05). The transdifferentiation capacity of c-kit+ cells into the endothelial lineage, pericytes, and cardiomyocytes were reduced through the inhibition of related genes (P<0.05). TEM analysis revealed cardiomyocyte differentiation rate in c-kit+ cells coincided with an increased intracellular lipid accumulation and reduced number of mitochondria. Similar to in vitro condition, the angiogenic capacity of c-kit+ cells was aborted in vivo indicated by reduced NG2 , α-SMA, CD31, and vWF levels. High glucose condition reduces the angio/cardiogenic capacity of cardiac c-kit+ cells in vitro and in vivo. SIGNIFICANCE OF THE STUDY: High glucose condition seen in diabetes mellitus could affect the regenerative potential of cardiac tissue. The current experiment showed that the exposure of murine cardiac progenitor cells (CD117+ cells) to condition containing 30mM glucose could decrease the differentiation properties into endothelial cells, pericytes, and mature cardiomyocytes in vitro and in vivo. Our finding confirmed that the angiogenic/cardiogenic potential cardiac progenitor cells decrease under treatment with high glucose content as seen in the diabetic condition.