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Role of brain angiotensin II in the central mechanism of blood pressure control and its significance for hypertension.

Research Project

Project/Area Number 63570410
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Circulatory organs internal medicine
Research InstitutionWakayama Medical College

Principal Investigator

UENO Yuji  Wakayama Medical College, 医学部, 講師 (50151824)

Co-Investigator(Kenkyū-buntansha) ARITA Mikio  Wakayama Medical College, 医学部, 講師 (40168018)
SURUDA Hidetoshi  Wakayama Medical College, 医学部, 研究員 (40163068)
YAMAMOTO Katsuhiro  Wakayama Medical College, 医学部, 助手 (10191397)
Project Period (FY) 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsCentral mechanisms of blood pressure control / Hypertension / Angiotensin II / Vasopressin / Baroreceptor reflex / Cardiopulmonary baroreceptor / 迷走神経
Research Abstract

To determine the principal effects of brain angiotensin (ANG)II on the sympathetic nervous system, vasopressin (AVP), and the high and low pressure baroreceptor systems, we observed the hemodynamic and neurohumoral characteristics induced by the acute (1-hr) and chronic (1-wk) infusion or Ang II into the brain ventricle in conscious dogs, and then evaluated the hemodynamic responses to soleinnervated carotid artery occlusion (COR) after Ang II infusion and again after vagotomy in anesthetized dogs. In addition, the effects of Ang II and AVP infused into the brain ventricle on the cardiopulmonary baroreceptor reflex were examined using vagal cold block techniques. Both acute (50ng/kg/min) and chronic (15ng/kg/min) infusion of And II caused a significant rise in arterial pressure without changes in heart rate. Neither acute nor chronic Ang II treatment produced significant changes in plasma renin activity and norepinephrine in plasma and cerebrospinal fluid (CSF), while the plasma and CS … More F level of AVP was increased in the acute Ang II treatment, but not in the chronic Ang II treatment. The COR was blunted in the acute Ang II treatment compared with those obtained in the chronic Ang II or sham treatment. The blunted pressor response to carotid occlusion in the acute AngII treatment was restored by cutting the remaining vagus nerve. A significant increase in mean arterial pressure, cardiac output and vascular resistance was produced by VCB in anesthetized and sino-aortic denervated dogs. These hemodynamic responses to VCB were attenuated by Ang II (50-200ng/kg) treatment into the brain ventricle, resulting from the marked decrease in cardiac output and vascular resistance. However, a substantial change in hemodynamic responses to VCB was not observed when AVP (4-10 g/kg) was applied into CSF. These results suggest that both arterial and cardiopulmonary baroreceptor reflexes are impaired by the acute excess of Ang II in the brain, and it might be mediated through changes in the central integration of low and high pressure baroreceptors. Less

Report

(2 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Katsuhiro Yamamoto,et al.: Clin.Exp.Hypertension.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hidetoshi Suruda,et al.: Ther.Res.8. 1572-1581 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yuji Ueno,et al.: Hypertension. 11. I-172-I-177 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 山本勝広 他: 高血圧. 11. 84 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 口井正人 他: "Annual Review循環器;高血圧とカテコールアミン" 中外医学社, 388 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Katsuhiro Yamamoto; et al.: "Contributions of the sympathetic nervous system, vasopressin and baroreceptor function in brain angiotensin II excess-induced hypertension in the dog." Clin. Exp. Hypertension. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Hidetoshi Suruda; et al.: "Role of brain angiotensin II in the mechanisms for blood pressure control, expression of experimental hypertension, and sodium-water balance in sodium loaded state." Ther. Res.8. 1572-1581 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yuji Ueno; et al.: "Characteristics of hormonal and neurogenic mechanisms of DOC-induced hypertension." Hypertension. 11. 172-177 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Masato Kuchii; et al.: Annual Review Cardiology; Hypertension and catecholamine.Chugai Igaku Co. LTD., 388 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Katsuhiro Yamamoto;et al.: Clin.Exp.Hypertension.

    • Related Report
      1988 Annual Research Report
  • [Publications] Hidetoshi Suruda;et al.: Ther.Res.8. 1572-1581 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Yuji Ueno;et al.: Hypertension. 11. I-172-I-177 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 山本勝広 他: 高血圧. 11. 84 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 口井正人 他: "Annual Review循環器;高血圧とカテコールアミン" 中外医学社, 388 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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