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Cross-talk between the dipeptidyl peptidase-4 and stromal cell-derived factor-1 in stem cell homing and myocardial repair : potential impact of dipeptidyl peptidase-4 inhibitors
Anderluh, Marko ...
Dipeptidyl peptidase-4 (DPP-4), glycyl-prolyl-naphthylamidase, is a serine protease that catalyses the hydrolysis of various proline-containing polypeptides. It is involved in the inactivation of ...glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), having in this way a profound influence on glucose metabolism. During organ damage, stromal and endothelial cells produce a chemokine known as stromal cell-derived factor-1 (SDF-1), a powerful chemoattractant of stem/progenitor cells. SDF-1 binds to a specific alpha-chemokine receptor (CXCR4) and can be degraded by proteases, including matrix DPP-4/CD26, presented in the circulation, or activated in injured tissues. DPP-4 inhibition has received considerable attention because of its significant therapeutic benefits in the regulation of insulin secretion and tissue insulin sensitivity, the regulation of tumour growth and metastasis, angiogenesis, tissue repair, especially after myocardial infarction, and regulation of endocrine function. Inhibition of circulating proteases appears to maintain the optimal endogenous SDF-1 concentration and may enhance homing of endothelial progenitor cells. In the present article, we present an overview of some basic facts about therole of DPP-4 in glucose homeostasis, the mechanism of its inhibition, and a brief summary of available DPP-4 inhibitors. Furthermore, since protection against the overactivity of proteases is important for restorating cardiac function and repair after myocardial damage, necrosis and apoptosis, we propose that administration of a DPP-4 inhibitor may also be beneficial following myocardial infarction by the prevention of cleavage of stem cell chemoattractant cytokine SDF-1.
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