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- W2049523626 abstract "High dietary salt intake activates the brain renin-angiotensin system in spontaneously hypertensive rats (SHR) and Dahl S rats, resulting in sympathetic hyperactivity and hypertension. Increases of sodium concentration in cerebrospinal fluid (CSF) and/or enhanced responses to CSF sodium are considered to be involved in the high dietary salt-induced activation of central nervous system pathways in those rats. Previously we have demonstrated that intracerebroventricular injection of hypertonic saline increases the neural activity of angiotensin II-sensitive neurons trans-synaptically via endogenous angiotensins in the anterior hypothalamic area (AHA) of rats. In the present study, we examined whether the AHA angiotensin II-sensitive neuron response to hypertonic saline would differ in SHR and Dahl S rats from those of their controls. Male 15- to 16-week-old SHR and age-matched Wistar Kyoto rats (WKY), Dahl S rats and Dahl R rats and Wistar rats were anesthetized and artificially ventilated. Extracellular potentials were recorded from single neurons in the AHA. Intracerebroventricular injection of hypertonic saline increased the firing rate of AHA angiotensin II-sensitive neurons. The threshold sodium concentration for the central sodium-induced increase of neural firing was lower in SHR than those of WKY, Dahl S rats, Dahl R rats and Wistar rats. The increase in neural firing induced by hypertonic saline (250 mM) was greater in SHR than those of other four kinds of rats. Similarly, the threshold sodium concentration was lower in Dahl S rats than those of WKY, Dahl R rats and Wistar rats and the increase in neural firing induced by hypertonic saline (250 mM) was greater in Dahl S rats than those of WKY, Dahl R rats and Wistar rats. In SHR, intracerebroventricular injection of the amiloride-sensitive sodium channel blocker benzamil abolished the hypertonic saline (250 mM)-induced increase in neural firing, but the sodium channel blocker itself did not affect the basal firing of these neurons. These findings indicate that central sodium-induced activation of AHA angiotensin II-sensitive neurons is enhanced in SHR and Dahl S rats." @default.
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- W2049523626 date "2006-01-01" @default.
- W2049523626 modified "2023-09-26" @default.
- W2049523626 title "Enhanced central hypertonic saline-induced activation of angiotensin II-sensitive neurons in the anterior hypothalamic area of spontaneously hypertensive and Dahl S rats" @default.
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- W2049523626 doi "https://doi.org/10.1016/j.brainresbull.2005.09.004" @default.
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