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Published on: July 11, 2017
Interaction Between Pannexin 1 and Caveolin-1 in Smooth Muscle Can Regulate Blood Pressure
Leon J DeLalio1,2, Alexander S Keller1,2, Jiwang Chen3
1From the Robert M. Berne Cardiovascular Research Center (L.J.D., A.S.K., H.R.A.-P., T.C.S.K., S.R.J., R.B.W., M.E.G., S.A.M., A.K.B., B.E.I.).
Caveolin-1 (Cav1) in vascular smooth muscle cells (VSMCs) is crucial for pannexin-1 (Panx1) channel function, regulating blood pressure through adrenergic vasoconstriction. Disrupting this interaction impairs blood pressure homeostasis.
Area of Science:
- Cardiovascular Physiology
- Cell Biology
- Molecular Medicine
Background:
- Sympathetic nerve activity regulates blood pressure via vasoconstriction of arterioles.
- Pannexin-1 (Panx1) channels release ATP, mediating adrenergic responses in vascular smooth muscle cells (VSMCs).
- Adrenergic signaling and Panx1 function require localization to membrane caveolae, rich in caveolin-1 (Cav1).
Purpose of the Study:
- To investigate if Panx1 localization to Cav1-enriched caveolae enhances channel function.
- To determine the role of the Panx1-Cav1 interaction in adrenergic vasoconstriction.
- To assess the importance of this interaction for blood pressure homeostasis.
Main Methods:
- In vitro VSMC culture models.
- Ex vivo studies using resistance arteries.
- Development and utilization of a novel inducible VSMC-specific Cav1 knockout mouse model.
Main Results:
- Panx1 and Cav1 colocalized in VSMCs of resistance arteries in an adrenergic stimulus-dependent manner.
- Genetic deletion of Cav1 significantly reduced adrenergic-stimulated ATP release and vasoconstriction.
- Mice lacking VSMC Cav1 exhibited reduced mean arterial pressure and resistance to Panx1 inhibition.
Conclusions:
- Translocalization of Panx1 to Cav1-enriched caveolae in VSMCs enhances purinergic signaling.
- This interaction is essential for adrenergic-mediated vasoconstriction.
- The Panx1-Cav1 complex plays a critical role in maintaining blood pressure homeostasis.
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