Abstract
Interplay between CXCR7 and other CXC receptors, namely CXCR4 or CXCR3, binding such ligands as SDF-1 or ITAC, was shown to regulate multiple cellular processes. The developmental role of signaling pathways mediated by these receptors was proven by the phenotypes of mice lacking either functional CXCR4, or CXCR7, or SDF-1, showing that formation of certain lineages relies on these factors. In this study, using in vitro differentiating mouse embryonic stem cells that lacked the function of CXCR7, we asked the question about the role of CXCR mediated signaling during early steps of differentiation. Our analysis showed that interaction of SDF-1 or ITAC with CXC receptors is necessary for the regulation of crucial developmental regulators expression and that CXCR7 is involved in the control of ESC pluripotency and differentiation into mesodermal lineages.
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