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Original Articles

Genetic association of hypertension and vascular changes in stroke-prone spontaneously hypertensive rats.

C A Bruner, J H Myers, C F Sing, P T Jokelainen, R C Webb
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https://doi.org/10.1161/01.HYP.8.10.904
Hypertension. 1986;8:904-910
Originally published October 1, 1986
C A Bruner
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J H Myers
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C F Sing
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P T Jokelainen
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R C Webb
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Abstract

Isolated tail arteries from stroke-prone spontaneously hypertensive rats (SHRSP) exhibit oscillatory contractile activity in response to norepinephrine, whereas those from normotensive Wistar-Kyoto rats (WKY) do not. To determine whether the norepinephrine-induced oscillations are related to high blood pressure or to separable genetic differences between strains, the response to norepinephrine was studied in adult SHRSP, WKY, and progeny of genetic crosses of SHRSP and WKY (F1, F2, F1 X SHRSP, F1 X WKY). Helical tail artery strips were mounted in a tissue bath for isometric force recording. Rats were classified as responders if oscillatory activity in the presence of 1.8 X 10(-7) M norepinephrine exceeded 250 mg/10 min (milligrams of force amplitude during a 10-minute interval). The blood pressures (mm Hg +/- SEM; tail cuff method) and percentage of rats exhibiting norepinephrine-induced oscillations were as follows: WKY: 109 +/- 3, 0%; F1: 129 +/- 4, 0%; F2: 150 +/- 4, 38%; F1 X WKY: 137 +/- 3, 9%; F1 X SHRSP: 188 +/- 7, 71%; SHRSP: 207 +/- 7, 100%. The distribution of the frequency of animals with oscillatory activity among the progenies was consistent with the hypothesis that a single gene locus determines the observed difference in oscillatory activity between the WKY and SHRSP strains. The allele from the SHRSP that determines the activity phenotype is recessive to the allele contributed by the normotensive WKY strain. In the segregating F2 progeny, the blood pressure of the responders was higher than that of the nonresponders (161 +/- 6 vs 144 +/- 4 mm Hg; p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)

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Hypertension
October 1986, Volume 8, Issue 10
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    Genetic association of hypertension and vascular changes in stroke-prone spontaneously hypertensive rats.
    C A Bruner, J H Myers, C F Sing, P T Jokelainen and R C Webb
    Hypertension. 1986;8:904-910, originally published October 1, 1986
    https://doi.org/10.1161/01.HYP.8.10.904

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    Genetic association of hypertension and vascular changes in stroke-prone spontaneously hypertensive rats.
    C A Bruner, J H Myers, C F Sing, P T Jokelainen and R C Webb
    Hypertension. 1986;8:904-910, originally published October 1, 1986
    https://doi.org/10.1161/01.HYP.8.10.904
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