H19 Promotes Osteoblastic Transition by Acting as ceRNA of miR-140-5p in Vascular Smooth Muscle Cells

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• Cellular Biology

Background:

• Arterial medial calcification is a prevalent complication in type 2 diabetes, end-stage renal disease, and hypertension, contributing to cardiovascular events.
• The long non-coding RNA H19 is implicated in cardiovascular diseases, but its role in arterial medial calcification is not well understood.

Purpose of the Study:

• To investigate the role and underlying mechanism of H19 in arterial medial calcification.
• To elucidate the interaction between H19, miR-140-5p, and Satb2 in vascular smooth muscle cell (VSMC) osteogenic differentiation.

Main Methods:

• Utilized beta-glycerophosphate (β-GP) to induce VSMC calcification in vitro.
• Assessed H19 expression, osteogenic gene markers (Runx2, ALP), and ALP activity.
• Performed luciferase reporter assays and RIP analysis to confirm H19-miR-140-5p interaction.
• Investigated the effects of H19, miR-140-5p, and Satb2 on VSMC differentiation and MAPK signaling (ERK1/2, p38MAPK).

Main Results:

• H19 expression was upregulated in β-GP-induced VSMCs.
• H19 overexpression enhanced, while knockdown inhibited, VSMC osteogenic differentiation.
• H19 directly interacted with miR-140-5p.
• miR-140-5p targeted Satb2, and its overexpression counteracted H19-induced effects.
• Satb2 overexpression activated ERK1/2 and p38MAPK signaling.

Conclusions:

• H19 promotes VSMC calcification by functioning as a competing endogenous RNA for miR-140-5p.
• This process involves the Satb2-mediated activation of ERK1/2 and p38MAPK signaling pathways.
• H19 represents a potential therapeutic target for arterial medial calcification.