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Is angiotensin II involved in dehydration-enhanced fever induced by endotoxin in rats ?

Research Project

Project/Area Number 12670060
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental physiology (including Physical medicine and Nutritional physiology)
Research InstitutionTottori University

Principal Investigator

MIYOSHI Michio  Tottori University, Faculty of Medicine, Assistant, 医学部, 助手 (20093627)

Co-Investigator(Kenkyū-buntansha) WATANABE Tatsuo  Tottori University, Faculty of Medicine, Professor, 医学部, 教授 (60182929)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsAngiotensin II / dehydration / angiotensin-converting enzyme inhibitor / Fever / interleukin-1β / interleukin-6 / mRNA / Angiotensin II type 1 receptor antagonist / ANG1型受容体拮抗薬 / インタ一ロイキン-1β / 内因性発熱物質 / ANG変換酵素阻害薬 / IL-1β
Research Abstract

It has been reported that a host develops a marked fever under dehydrated conditions compared with normally hydrated conditions. The present study was carried out to investigate whether angiotensin II (ANG II) is involved in the enhancement seen in dehydrated rats of the fever induced by lipopolysaccharide (LPS). The results showed that intravenous injection of LPS produced a fever in dehydrated rats that was significantly greater than that seen in normally hydrated rats. Under dehydrated conditions, the enhanced LPS-induced fever was significantly inhibited by the angiotensin-converting enzyme (ACE) inhibitor. From the above results, it seems highly likely that ANG II is involved in the LPS-induced production of proinflammatory cytokines under dehydrated conditions. To test this possibility, we next examined the effect of an ACE inhibitor and of an antagonist of the type 1 ANG II receptor (AT_1-receptor) on the LPS-induced production of the proinflammatory cytokines interleukin-1 (IL-1) and IL-6 in dehydrated rats. An injection of LPS induced a marked increase in the expression ofIL-1β mRNA in the liver, an effect that was significantly attenuated by pre-treatment with the ACE inhibitor. The ACE inhibitor reduced the LPS-induced increase in the hepatic concentration of IL-1β protein. When the AT_1-receptor antagonist was given before the LPS, the increase in the hepatic concentration of IL-1β was significantly reduced. Furthermore, the ACE inhibitor reduced the LPS-induced increase in the plasma concentration of IL-6. These results suggest that ANG II and its AT_1-receptor play an important role in the production of proinflammatory cytokines that is induced by LPS, and that the enhancement of the LPS-induced fever seen in dehydrated rats is due to increased secretion of ANG II which stimulates the production of the cytokines.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Watanabe, T: "Angiotensin-converting enzyme inhibitor inhibits dehydration-enhanced fever induced by endtoxin in rats"Am J Physiol Regulatory Integrative Comp Physiol. 279. R1512-R1516 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Watanabe, T: "Role of angiotensin II and its receptors in the development of fever in euhydrated and dehydrated rodents"Journal of Thermal Biology. 26. 307-312 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Watanabe, T., Hashimoto, M., Wada, M., Imoto, T., Miyoshi, M., Sadamitsu, D. & Maekawa, T.: "Angiotensin-converting enzyme inhibitor inhibits dehydration-enhanced fever induced by endtoxin in rats"Am J Physiol Regulatory Integrative Comp Physiol. 279. R1512-R1516 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Watanabe, T: "Role of angiotensin II and its receptors in the development of fever in euhydrated and dehydrated rodents"Journal of Thermal Biology. 26. 307-312 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Watanabe, T: "Role of angiotensin II and its receptors in the development of fever in euhydrated and dehydrated rodents"Journal of Thermal Biology. 26. 307-312 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Watanabe.T.: "Angiotensin-converting enzyme inhibitor inhibits dehydration-enhanced fever induced by endotoxin in rats"Am J Physiol Regulatory Integrative Comp Physiol. 279. R1512-R1516 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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