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Related Experiment Video

Updated: Jul 7, 2026

Assessing Murine Resistance Artery Function Using Pressure Myography
07:25

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Smooth muscle LRRC8A knockout preserves vascular function in AngII hypertension.

Hyehun Choi, Sourav Panja, Hong-Ngan Nguyen

    Biorxiv : the Preprint Server for Biology
    |June 4, 2025
    PubMed
    Summary

    Leucine Rich Repeat Containing 8A (LRRC8A) anion channels contribute to Angiotensin II-induced hypertension and vascular inflammation. LRRC8A knockout mice showed preserved blood pressure dipping and reduced vascular dysfunction after Angiotensin II infusion.

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    Area of Science:

    • Cardiovascular Biology
    • Molecular Medicine
    • Renal Physiology

    Background:

    • Angiotensin II (AngII) induces hypertension and vascular inflammation via cytokines.
    • NADPH oxidase 1 (Nox1) and Leucine Rich Repeat Containing 8A (LRRC8A) anion channels are activated by AngII and TNFα in vascular smooth muscle cells (VSMCs).
    • LRRC8A channels modulate inflammation and contractility, and VSMC-specific LRRC8A knockout (KO) protects against TNFα-induced vascular injury.

    Purpose of the Study:

    • To investigate the role of LRRC8A in AngII-induced hypertension and vascular dysfunction.
    • To determine if LRRC8A KO preserves vascular function and reduces blood pressure (BP) in AngII-infused mice.

    Main Methods:

    • AngII infusion in wild type (WT) and LRRC8A KO mice for 14 days.
    • Measurement of systolic blood pressure and BP dipping patterns.
    • Assessment of vascular contractility and relaxation in response to various stimuli.
    • Western blotting for key signaling proteins and analysis of vascular proliferation, antioxidant enzymes, and senescence markers.

    Main Results:

    • Systolic BP was similar between groups, but KO mice exhibited preserved BP dipping after AngII infusion.
    • LRRC8A KO vessels showed less impairment in contractility and preserved relaxation after AngII exposure.
    • KO aortae displayed increased soluble guanylate cyclase alpha, reduced CPI-17, lower Rho kinase activity, and reduced phosphorylation of ERM and Cofilin.
    • AngII induced less proliferation, antioxidant enzyme induction, and senescence marker expression in KO vessels.

    Conclusions:

    • LRRC8A channels are not required for AngII-induced contraction but support the associated inflammatory response.
    • LRRC8A KO preserves vascular function and modifies blood pressure dipping patterns in response to AngII.
    • Targeting LRRC8A may offer a therapeutic strategy for hypertension-related vascular complications.