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Updated: Sep 29, 2025
A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro
Published on: June 2, 2022
Kv1.3 Channel Inhibition Limits Uremia-Induced Calcification in Mouse and Human Vascular Smooth Muscle
Violeta Cazaña-Pérez1,2, Pilar Cidad3, Juan F Navarro-González2
1Departamento de Ciencias Médicas Básicas (Fisiología), Instituto de Tecnologías Biomédicas, Universidad de La Laguna, Spain.
Abstract:
Chronic kidney disease (CKD) significantly increases cardiovascular risk. In advanced CKD stages, accumulation of toxic circulating metabolites and mineral metabolism alterations triggers vascular calcification, characterized by vascular smooth muscle cell (VSMC) transdifferentiation and loss of the contractile phenotype. Phenotypic modulation of VSMC occurs with significant changes in gene expression. Even though ion channels are an integral component of VSMC function, the effects of uremia on ion channel remodeling has not been explored. We used an in vitro model of uremia-induced calcification of human aorta smooth muscle cells (HASMCs) to study the expression of 92 ion channel subunit genes. Uremic serum-induced extensive remodeling of ion channel expression consistent with loss of excitability but different from the one previously associated with transition from contractile to proliferative phenotypes. Among the ion channels tested, we found increased abundance and activity of voltage-dependent K+ channel Kv1.3. Enhanced Kv1.3 expression was also detected in aorta from a mouse model of CKD. Pharmacological inhibition or genetic ablation of Kv1.3 decreased the amount of calcium phosphate deposition induced by uremia, supporting an important role for this channel on uremia-induced VSMC calcification.
Insights
Chronic kidney disease (CKD) causes vascular calcification by altering ion channels in smooth muscle cells. Targeting Kv1.3 channels may prevent this dangerous complication.
Area of Science:
- Cardiovascular Biology
- Nephrology
- Molecular Biology
Background:
- Chronic kidney disease (CKD) elevates cardiovascular disease risk.
- Uremia in advanced CKD leads to vascular calcification via smooth muscle cell (VSMC) transdifferentiation.
- Ion channel remodeling in VSMC during uremia is not well understood.
Purpose of the Study:
- To investigate the impact of uremia on ion channel expression in human aorta smooth muscle cells (HASMCs).
- To identify specific ion channels involved in uremia-induced VSMC calcification.
Main Methods:
- Utilized an in vitro model of uremia-induced calcification using HASMCs.
- Analyzed the expression of 92 ion channel subunit genes.
- Validated findings in a mouse model of CKD and through pharmacological/genetic inhibition of Kv1.3.
Main Results:
- Uremic serum induced significant ion channel expression remodeling in HASMCs, indicating altered excitability.
- Increased abundance and activity of voltage-dependent K+ channel Kv1.3 were observed.
- Enhanced Kv1.3 expression was confirmed in CKD mouse aortas.
- Inhibiting or ablating Kv1.3 reduced uremia-induced calcium phosphate deposition in VSMCs.
Conclusions:
- Uremia profoundly alters ion channel expression in VSMCs, distinct from other phenotypic changes.
- Kv1.3 channel activity is a key contributor to uremia-induced vascular calcification.
- Targeting Kv1.3 presents a potential therapeutic strategy for vascular complications in CKD.
