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• W224730831 abstract "The purpose of the study is to investigate the role of the serotonergic nervous system in centrally administrated angiotensin II (A-II) mediated hemodynamic as well as vasopressin (AVP) responses.Eight-week-old male SHR and age-matched Wistar Kyoto rats (WKY) were used and the experiment was performed in the conscious state. In protocol 1, after resting observation of 30 minutes 10ng of A-II was given intracerebroventricularly (i. c. v.). This was followed by i. c. v. injection of 1μg of 5-HT2 receptor antagonist, xylamidine, 50 minutes later; then 10ng of i. c. v. A-II was repeated after 10 minutes (SHR: n=7, WKY: n=10). In protocol 2, plasma vasopressin (AVP) was measured in the following groups. In one group, 1.3ml of blood was sampled from the carotid cannula after resting observation, and the same amount of blood from an age-matched donor rat of the same strain was transfused immediately. Two hours later, 10ng of A-II was given i. c. v., and blood was sampled again after 1 minute (SHR: n=7, WKY: n=12). In another group, 1μg of xylamidine was given i. c. v. and was followed by 10ng of A-II 10 minutes later; then blood was collected after 1 minute (SHR: n=8, WKY: n=13).In protocol 1, resting MAP were 144±6mmHg in SHR and 99±2mmHg in WKY. I. c. v. A-II elicited a consistent pressor response in both SHR and WKY, but the response was significantly larger in SHR than that in WKY, +45±173 and +37±1mmHg, respectively. Xylamidine had no effect on MAP, and repeated A-II produced significant pressor responses. However, the responses were significantly smaller in both SHR (+36±3mmHg) and WKY (+25±1mmHg) as compared with those to initial A-II injection. In protocol 2, resting AVP were similar in SHR (1.5±0.2pg/ml) and in WKY (1.6±0.1pg/ml). However, after i. c. v. A-II injection, AVP became higher in SHR (131±14pg/ml) than in WKY (64±6pg/ml). AVP after A-II injection with xylamidine pretreatment were similar in SHR (48±6pg/ml) and in WKY (45±4pg/ml).Since the responses of both MAP and AVP to i. c. v. A-II were larger in SHR, and the responses were effectively suppressed by S2 receptor antagonists, the central serotonergic nervous system may play an important role in the hemodynamic as well as AVP responses to i. c. v. A-II administration." @default.
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• W224730831 date "1990-01-01" @default.
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• W224730831 title "Role of the Serotonergic Nervous System in Hemodynamic and Vasopressin Responses to Centrally Administrated Angiotensin-II in Spontaneously Hypertensive Rats" @default.
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• W224730831 doi "https://doi.org/10.1507/endocrine1927.66.7_678" @default.
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