Vasostatin-2 associates with coronary collateral vessel formation in diabetic patients and promotes angiogenesis via angiotensin-converting enzyme 2.

AIMS Members of the chromogranin family play a role in angiogenesis. One such biologically active peptide, generated through the processing of chromogranin A, is vasostatin-2. This study aimed at assessing the association of serum vasostatin-2 levels with coronary collateral vessels (CCV) in diabetic patients with chronic total occlusions (CTO) and the effects of vasostatin-2 on angiogenesis in diabetic mice with hindlimb or myocardial ischemia. METHODS AND RESULTS Serum levels of vasostatin-2 in 452 diabetic CTO patients were evaluated. The status of CCV was categorized according to the Rentrop score. Vasostatin-2 recombinant protein or phosphate-buffered saline were then injected intraperitoneally in diabetic mouse models of hindlimb or myocardial ischemia, followed by laser Doppler imaging and molecular biology examinations. The effects of vasostatin-2 were also ascertained in endothelial cells and macrophages, with mechanisms clarified using ribonucleic acid (RNA) sequencing. Serum levels of vasostatin-2 were significantly different and progressively higher across Rentrop score 0, 1, 2, and 3 groups (P < .001), with significantly lower levels in patients with poor CCV (Rentrop score 0 and 1) than in those with good CCV (Rentrop score 2 and 3) (P < .05). Vasostatin-2 significantly promoted angiogenesis in diabetic mice with hindlimb or myocardial ischemia. RNA-seq analyzes verified an angiotensin-converting enzyme 2 (ACE2)-mediated vasostatin-2-induction of angiogenesis in ischemic tissues. CONCLUSION Lower serum levels of vasostatin-2 are associated with poor CCV in diabetic CTO patients compared with patients with good CCV. Vasostatin-2 significantly promotes angiogenesis in diabetic mice with hindlimb or myocardial ischemia. Such effects are mediated by ACE2.

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