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Am J Physiol Heart Circ Physiol 279: H58-H66, 2000;
0363-6135/00 $5.00
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Vol. 279, Issue 1, H58-H66, July 2000

SHR Y chromosome enhances the nocturnal blood pressure in socially interacting rats

Ann Caplea, Darcie Seachrist, Gail Dunphy, and Daniel Ely

Department of Biology, The University of Akron, Akron, Ohio 44325-3908

Our objective was to test the hypothesis that nocturnal mean arterial pressure (MAP), heart rate (HR), and activity would be increased in 1) colony over individually caged rats and 2) the spontaneously hypertensive rat (SHR) Y chromosome strain (SHR/y colony) compared with Wistar-Kyoto (WKY) rats. MAP, HR, and activity were monitored using radiotelemetry. The nocturnal MAP rise expressed as the percentage change in MAP from light to dark was increased (P < 0.05) in the SHR/y colony. The SHR Y chromosome increased MAP in both the colony and caged groups compared with WKY (P < 0.001). The SHR/y colony animals spent 23% of a 24-h period at a MAP >120 mmHg, whereas the WKY colony animals spent 2% of a 24-h period in this range. The MAP of the SHR/y colony on clonidine was reduced (P < 0.001) to WKY baseline values. Activity but not HR was increased (P < 0.01) in the WKY and SHR/y colonies compared with caged animals. In conclusion, colony housing and the SHR Y chromosome increased MAP compared with individually caged housing.

colony; clonidine; sympathetic nervous system


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A. Caplea, D. Seachrist, G. Dunphy, and D. Ely
Sodium-induced rise in blood pressure is suppressed by androgen receptor blockade
Am J Physiol Heart Circ Physiol, April 1, 2001; 280(4): H1793 - H1801.
[Abstract] [Full Text] [PDF]


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