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miR-29a-3p/Vegfa axis modulates high phosphate-induced vascular smooth muscle cell calcification
Chen Fu1, Qiaojing Liang2, Lili Ma3
1Department of Nephrology, National Center for Orthopaedics, Beijing Jishuitan Hospital, Capital Medical University, Beijing, China.
Insights
MicroRNAs, specifically miR-29a-3p, can prevent vascular calcification in chronic kidney disease by targeting vascular endothelial growth factor A (Vegfa). This finding offers a potential new therapy for cardiovascular disease.
Area of Science:
- Cardiovascular Biology
- Molecular Medicine
- Nephrology
Background:
- Vascular calcification (VC) is a significant driver of cardiovascular disease (CVD) progression, characterized by arterial stiffness and reduced blood flow.
- Chronic kidney disease (CKD) patients exhibit accelerated VC due to mineral metabolism imbalances and high phosphate levels, promoting vascular smooth muscle cell (VSMC) calcification.
- MicroRNAs (miRNAs) are emerging as critical regulators of VC, with the miR-29 family showing involvement in extracellular matrix remodeling and calcification processes.
Purpose of the Study:
- To investigate the role of the miR-29a-3p/vascular endothelial growth factor A (Vegfa) axis in the pathogenesis of VC associated with CKD.
- To determine if miR-29a-3p can modulate VSMC calcification by targeting Vegfa.
Main Methods:
- Dual-luciferase assays and bioinformatic analyses were employed to confirm the direct targeting of Vegfa by miR-29a-3p.
- VSMC calcification was assessed under high phosphate conditions using Alizarin Red staining (ARS) and intracellular calcium content (ICC) measurements.
- Experiments involved miR-29a-3p overexpression, Vegfa overexpression, and Vegfa knockdown to evaluate their effects on VSMC calcification.
Main Results:
- miR-29a-3p directly targets and downregulates Vegfa expression.
- Overexpression of miR-29a-3p significantly attenuated VSMC calcification, reducing ARS and ICC.
- Conversely, Vegfa overexpression exacerbated calcification, while Vegfa knockdown mitigated these effects; miR-29a-3p demonstrated protective effects even in the presence of Vegfa overexpression.
Conclusions:
- The miR-29a-3p/Vegfa axis plays a crucial role in regulating VSMC calcification, particularly in the context of CKD.
- Targeting the miR-29a-3p/Vegfa pathway presents a promising therapeutic strategy for managing VC in CKD patients.
- miRNA-based interventions hold potential for preventing pathological calcification and reducing CVD risk in individuals with CKD.
Abstract:
Vascular calcification (VC) is a major contributor to the progression of cardiovascular disease (CVD). The VC is characterized by arterial stiffness and impaired blood flow. This pathology is especially prevalent in chronic kidney disease (CKD), where dysregulated mineral metabolism and elevated phosphate levels accelerate calcification of vascular smooth muscle cells (VSMCs). Emerging evidence suggests that microRNAs (miRNAs) are key regulators of VC, with the miR-29 family implicated in extracellular matrix remodeling and calcification. We investigated the role of the miR-29a-3p/vascular endothelial growth factor A (Vegfa) axis in CKD-associated VC. Dual-luciferase assays and bioinformatic analysis confirmed that miR-29a-3p directly targets Vegfa, a critical regulator of vascular homeostasis. miR-29a-3p overexpression significantly attenuated VSMC calcification under high phosphate conditions, as indicated by significantly reduced Alizarin Red staining (ARS, P < 0.0001) and intracellular calcium content (ICC, P = 0.0235). Conversely, Vegfa overexpression exacerbated calcification (P = 0.0010 for ICC and P = 0.0001 for ARS). Vegfa knockdown mitigated these effects (P < 0.0001 for both ARS and ICC). Notably, miR-29a-3p counteracted calcification even in Vegfa-overexpressing cells (P < 0.0001 for ARS and P = 0.0235 for ICC), underscoring its protective role in vascular integrity. These findings highlight the therapeutic potential of targeting the miR-29a-3p/Vegfa axis for VC management in patients with CKD. miRNA-based interventions may offer a promising strategy for preventing pathological calcification and reducing the risk of CVD in affected patients.
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