AUTHOR=Desjarlais Michel , Dussault Sylvie , Rivera José Carlos , Chemtob Sylvain , Rivard Alain 

TITLE=MicroRNA Expression Profiling of Bone Marrow–Derived Proangiogenic Cells (PACs) in a Mouse Model of Hindlimb Ischemia: Modulation by Classical Cardiovascular Risk Factors

JOURNAL=Frontiers in Genetics

VOLUME=Volume 11 - 2020

YEAR=2020

URL=https://www.frontiersin.org/journals/genetics/articles/10.3389/fgene.2020.00947

DOI=10.3389/fgene.2020.00947

ISSN=1664-8021

ABSTRACT=Background. Classical cardiovascular risk factors (CRF) are associated with impaired angiogenic activities of bone marrow-derived proangiogenic cells (PACs) related to peripheral artery diseases (PAD) and ischemia-induced neovascularization. microRNAs (miRs) are key regulators of gene expression, and they are involved in the modulation of PAC function and PAC paracrine activity. However, the effects of CRF on the modulation of miR expression in PACs are unknown.
Aims and Methods. We used a model of hindlimb ischemia and next generation sequencing (NGS) to perform a complete profiling of miRs in PACs isolated from the bone marrow of mice subjected to three models of CRF: aging, smoking (SMK) and hypercholesterolemia (HC).
Results.  Around 570 miRs were detected in PACs in the different CRF models. When excluding miRs with a very low expression level (˂ 100 RPM), 40-61 miRs were found to be significantly modulated by aging, SMK or HC. In each CRF condition, we identified downregulated pro-angiogenic miRs and upregulated anti-angiogenic miRs that could contribute to explain PAC dysfunction. Interestingly, several miRs were similarly downregulated (e.g. miR-542-3p, miR-29) or upregulated (e.g. miR-501, miR-92a) in all CRF conditions. In silico approaches including KEGG and cluster dendogram analyses identified predictive effects of these miRs on pathways having key roles in the modulation of angiogenesis and PAC function, including VEGF signaling, extracellular matrix (ECM) remodeling, PI3K/AKT/MAPK signaling, TGFb pathway, p53 and cell cycle progression.
Conclusion. This study describes for the first time the effects of CRF on the modulation of miR profile in PACs related to PAD and ischemia-induced neovascularization. We found that several angiogenesis-modulating miRs (angiomiRs) are similarly altered in different CRF conditions. Our findings constitute a solid framework for the identification of miRs that could be targeted in PACs in order to improve their angiogenic function, and for the future development of novel therapies to improve neovascularization and reduce tissue damage in patients with severe PAD.