miR-126 contributes to the epigenetic signature of diabetic vascular smooth muscle and enhances antirestenosis effects of Kv1.3 blockers.
Mol Metab 2021;
53:101306. [PMID:
34298200 PMCID:
PMC8363881 DOI:
10.1016/j.molmet.2021.101306]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/09/2021] [Accepted: 07/15/2021] [Indexed: 11/22/2022] Open
Abstract
Objectives
Restenosis after vessel angioplasty due to dedifferentiation of the vascular smooth muscle cells (VSMCs) limits the success of surgical treatment of vascular occlusions. Type 2 diabetes (T2DM) has a major impact on restenosis, with patients exhibiting more aggressive forms of vascular disease and poorer outcomes after surgery. Kv1.3 channels are critical players in VSMC proliferation. Kv1.3 blockers inhibit VSMCs MEK/ERK signalling and prevent vessel restenosis. We hypothesize that dysregulation of microRNAs (miR) play critical roles in adverse remodelling, contributing to Kv1.3 blockers efficacy in T2DM VSMCs.
Methods and results
We used clinically relevant in vivo models of vascular risk factors (VRF) and vessels and VSMCs from T2DM patients.
Resukts
Human T2DM vessels showed increased remodelling, and changes persisted in culture, with augmented VSMCs migration and proliferation. Moreover, there were downregulation of PI3K/AKT/mTOR and upregulation of MEK/ERK pathways, with increased miR-126 expression. The inhibitory effects of Kv1.3 blockers on remodelling were significantly enhanced in T2DM VSMCs and in VRF model. Finally, miR-126 overexpression confered “diabetic” phenotype to non-T2DM VSMCs by downregulating PI3K/AKT axis.
Conclusions
miR-126 plays crucial roles in T2DM VSMC metabolic memory through activation of MEK/ERK pathway, enhancing the efficacy of Kv1.3 blockers in the prevention of restenosis in T2DM patients.
Type 2 diabetes (T2DM) vessels show exacerbated remodeling in organ culture and increased Kv1.3 expression.
The inhibition of vessel remodeling with Kv1.3 blockers is increased in T2DM vessels.
VSMCs from T2DM patients retain epigenetic changes in primary cultures.
Upregulation of miR-126 contributes to the metabolic memory of T2DM VSMCs.
Upregulation of miR-126 potentiates Kv1.3-dependent mechanisms in T2DM VSMCs.
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