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- W2098125639 abstract "The midbrain periaqueductal gray (PAG) is a neural site for several physiological functions related to cardiovascular regulation, pain modulation and behavioral reactions. Recently, angiotensin-(1-7) [Ang-(1-7)] has been considered as an important biologically active component of the renin-angiotensin system in the CNS. The purpose of this study was to determine (1) existence of Ang-(1-7) receptor, Mas-R, within the dorsolateral PAG (dl-PAG), (2) the role for Ang-(1-7) in modulating activity of dl-PAG neurons, and (3) the mechanisms by which Ang-(1-7) plays a regulatory role. Western blot analysis showed that Mas-R appears within the dl-PAG. Whole cell patch-clamp recording demonstrated that the discharge rates of dl-PAG neurons were decreased from 4.35±0.32 Hz of control to 1.06±0.34 Hz (P<0.05, vs. control) by 100 nM of Ang-(1-7). With pretreatment of A-779, a Mas-R inhibitor, the discharge rate was 4.66±0.62 Hz (P>0.05, vs. control) during infusion of Ang-(1-7). Additionally, neuronal nitric oxide synthase (nNOS) was largely localized within the dl-PAG among the three isoforms. The effects of Ang-(1-7) on neuronal activity of the PAG were attenuated in the presence of S-methyl-L-thiocitrulline (SMTC), a nNOS inhibitor. The discharge rates were 4.21±0.39 Hz in control and 4.09±0⋅47 Hz (P>0.05, vs. control) when Ang-(1-7) was applied with pretreatment of SMTC. Those findings suggest that Ang-(1-7) plays an inhibitory role in the dl-PAG via a NO dependent signaling pathway. This offers the basis for the physiological role of Ang-(1-7) and Mas R in the regulation of various functions in the CNS." @default.
- W2098125639 created "2016-06-24" @default.
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- W2098125639 date "2012-08-01" @default.
- W2098125639 modified "2023-10-07" @default.
- W2098125639 title "Angiotensin-(1-7) inhibits neuronal activity of dorsolateral periaqueductal gray via a nitric oxide pathway" @default.
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- W2098125639 doi "https://doi.org/10.1016/j.neulet.2012.06.031" @default.
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