SUPPRESSION OF THE RENIN-ANGIOTENSIN SYSTEM INDUCED BY STREPTOZOTOCIN TREATMENT IN NEONATAL SPONTANEOUSLY HYPERTENSIVE RATS
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概要
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We studied whether or not neonatal streptozotocin (STZ) treatment would alter mean arterial pressure (MAP) and blood pressure regulating factors in conscious and unrestrained spontaneously hypertensive rats (SHR). Neonatal STZ administration to SHR resulted in type 2 diabetes mellitus with reduced MAP and heart rate. Plasma glucose was markedly increased in these diabetic animals and was inversely correlated with MAP. In the diabetic SHR, the hypotensive responses to captopril (SQ) or enalapril, administered intravenously, were diminished, regardless of preceding administrations of vasopressin V_1-antagonist (AVPA) or hexamethonium (C_6), when compared to findings in control rats. In contrast, the C_6-induced hypotension was similar in rats with diabetes and control animals. AVPA led to no decrease in MAP in either group. Hypotensive responses to SQ following AVPA and C_6 inversely correlated with the plasma levels of glucose in the diabetic group. The combined blockade of the renin-angiotensin system (RAS), sympathetic nervous system and vasoconstrictive action of vasopressin (AVP) abolished the differences in MAP between the groups. Pressor and bradycardic responses to intravenous noradrenaline, angiotensin II and AVP were practically identical in the diabetic and control SHR. Urinary aldosterone excretion rate was not altered by neonatal STZ treatment. In conclusion, a decrease in MAP in SHR with neonatal STZ treatment may be attributed to the suppressed pressor activity of RAS.
- 社団法人日本循環器学会の論文
- 1990-02-20
著者
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Tsuchihashi Takuya
Department Of Internal Medicine Kyushu Dental College
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Fujishima Masatoshi
Translational Research Center Kyoto University Hospital
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Fujishima Masatoshi
The Department Of Medicine And Clinical Science Graduate School Of Medical Sciences Kyushu Universit
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FUJISHIMA Masatoshi
Second Department of Internal Medicine, Faculty of Medicine, Kyushu University
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Takata Yutaka
Second Department Of Internal Medicine Faculty Of Medicine Kyushu University
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Takata Yutaka
Department Of Internal Medicine Kyushu Dental College
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Tomita Yuji
Second Department Of Internal Medicine Faculty Of Medicine Kyushu University
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Tomita Y
Kyushu Inst. Technology Kitakyushu Jpn
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Sadoshima Seizo
Second Department Of Internal Medicine Faculty Of Medicine Kyushu University
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TSUCHIHASHI TAKUYA
Second Department of Internal Medicine, Faculty of Medicine, Kyushu University
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NAKAO YAE
Second Department of Internal Medicine, Faculty of Medicine, Kyushu University
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YAMASHITA YOSHIAKI
Second Department of Internal Medicine, Faculty of Medicine, Kyushu University
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TAKISHITA SHUICHHI
Second Department of Internal Medicine, Faculty of Medicine, Kyushu University
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IWASE MASANORI
Second Department of Internal Medicine, Faculty of Medicine, Kyushu University
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Fujishima Masatoshi
Second Department Of Internal Medicine Faculty Of Medicine Kushu University
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Nakao Yae
Second Department Of Internal Medicine Faculty Of Medicine Kyushu University
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Iwase Masanori
Second Department Of Internal Medicine Faculty Of Medicine Kyushu University
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Yazaki Yoshio
The Third Dept. Of Medicine University Of Tokyo
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Yamashita Yoshiaki
Second Department Of Internal Medicine Faculty Of Medicine Kyushu University
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Fujishima Masatoshi
Medicine And Clinical Science. Graduate School Of Medical Sciences Kyushu University
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Fujishima Masatoshi
Second Departemnt of Internal Medicine, Kyushu University
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