MicroRNA-141 inhibits vascular smooth muscle cell proliferation through targeting PAPP-A

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• RNA Biology

Background:

• Atherosclerosis involves vascular smooth muscle cell (VSMC) proliferation, often induced by oxidized low-density lipoprotein (ox-LDL).
• MicroRNAs (miRNAs) are regulators of cell proliferation in various conditions, but their specific role in ox-LDL-induced VSMC proliferation remains unclear.

Purpose of the Study:

• To investigate the role and function of specific miRNAs in ox-LDL-induced VSMC proliferation.
• To identify potential molecular targets of these miRNAs in the context of atherosclerosis.

Main Methods:

• Quantitative real-time PCR to measure miR-141 expression.
• Cell proliferation assays to assess VSMC growth.
• Western blotting to detect PAPPA protein levels.
• Luciferase reporter assays to confirm direct targeting of PAPPA by miR-141.

Main Results:

• Ox-LDL treatment significantly suppressed miR-141 expression in VSMCs.
• Inhibition of miR-141 led to increased VSMC proliferation.
• PAPPA was identified as a direct target gene of miR-141.
• Overexpression of PAPPA partially reversed the inhibitory effect of miR-141 on VSMC proliferation.

Conclusions:

• miR-141 plays a critical role in regulating VSMC proliferation under ox-LDL stimulation.
• The miR-141/PAPPA axis is implicated in the pathogenesis of ox-LDL-induced VSMC proliferation.
• Targeting miR-141 or its downstream effectors may represent a novel therapeutic approach for atherosclerosis.