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Elife. 2018 Dec 4;7. pii: e42628. doi: 10.7554/eLife.42628.

Arterial smooth muscle cell PKD2 (TRPP1) channels regulate systemic blood pressure.

Author information

1
Department of Physiology, University of Tennessee Health Science Center, Memphis, United States.
#
Contributed equally

Abstract

Systemic blood pressure is determined, in part, by arterial smooth muscle cells (myocytes). Several Transient Receptor Potential (TRP) channels are proposed to be expressed in arterial myocytes, but it is unclear if these proteins control physiological blood pressure and contribute to hypertension in vivo. We generated the first inducible, smooth muscle-specific knockout mice for a TRP channel, namely for PKD2 (TRPP1), to investigate arterial myocyte and blood pressure regulation by this protein. Using this model, we show that intravascular pressure and α1-adrenoceptors activate PKD2 channels in arterial myocytes of different systemic organs. PKD2 channel activation in arterial myocytes leads to an inward Na+ current, membrane depolarization and vasoconstriction. Inducible, smooth muscle cell-specific PKD2 knockout lowers both physiological blood pressure and hypertension and prevents pathological arterial remodeling during hypertension. Thus, arterial myocyte PKD2 controls systemic blood pressure and targeting this TRP channel reduces high blood pressure.

KEYWORDS:

PKD2; blood pressure; hypertension; mouse; neuroscience; physics of living systems; smooth muscle

PMID:
30511640
PMCID:
PMC6281320
DOI:
10.7554/eLife.42628
[Indexed for MEDLINE]
Free PMC Article

Conflict of interest statement

SB, CF, RH, ML, PM, CM, KE, LM, AM, SB, QW, KK, JJ No competing interests declared

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