Ablation of TRPV1 Elevates Nocturnal Blood Pressure in Western Diet-fed Mice

Author(s): Beihua Zhong, Shuangtao Ma, Donna H. Wang*.

Journal Name: Current Hypertension Reviews

Volume 15 , Issue 2 , 2019

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Abstract:

Background: This study tested the hypothesis that genetically ablation of transient receptor potential vanilloid type 1 (TRPV1) exacerbates impairment of baroreflex in mice fed a western diet (WD) and leads to distinct diurnal and nocturnal blood pressure patterns.

Methods: TRPV1 gene knockout (TRPV1-/-) and wild-type (WT) mice were given a WD or normal diet (CON) for 4 months.

Results: Capsaicin, a selective TRPV1 agonist, increased ipsilateral afferent renal nerve activity in WT but not TRPV1-/- mice. The sensitivity of renal sympathetic nerve activity and heart rate responses to baroreflex were reduced in TRPV1-/--CON and WT-WD and further decreased in TRPV1-/--WD compared to the WT-CON group. Urinary norepinephrine and serum insulin and leptin at day and night were increased in WT-WD and TRPV1-/--WD, with further elevation at night in TRPV1-/--WD. WD intake increased leptin, IL-6, and TNF-α in adipose tissue, and TNF-α antagonist III, R-7050, decreased leptin in TRPV1-/--WD. The urinary albumin level was higher in TRPV1-/--WD than WT-WD. Blood pressure was not different during daytime among all groups, but increased at night in the TRPV1-/--WD group compared with other groups.

Conclusions: TRPV1 ablation leads to elevated nocturnal but not diurnal blood pressure, which is probably attributed to further enhancement of sympathetic drives at night.

Keywords: TRPV1, western diet, afferent renal nerve activity, sympathetic nerve activity, blood pressure, TNF-α.

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Article Details

VOLUME: 15
ISSUE: 2
Year: 2019
Page: [144 - 153]
Pages: 10
DOI: 10.2174/1573402114666181031141840

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