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Candidate Genes for Salt-Sensitive Hypertension in Young Male Tanzanians

Research Project

Project/Area Number 18614003
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 国際保健医療研究
Research InstitutionMukogawa Women's University

Principal Investigator

IKEDA Katsumi  Mukogawa Women's University, School of Pharmacy and Pharmaceutical Sciences, Professor (80273499)

Co-Investigator(Kenkyū-buntansha) MIKI Tomohiro  Mukogawa Women's University, School of Pharmacy and Pharmaceutical Sciences, Professor (30239206)
YASUI Naomi  Mukogawa Women's University, School of Pharmacy and Pharmaceutical Sciences, Assistant (70399145)
YAMORI Yukio  Mukogawa Women's University, Institute for World Health Development, Professor (80025600)
NARA Yasuo  Shujistu University, Department of Biological Pharmacy, School of Pharmacy, Professor (80116417)
NOGUCHI Takanori  Fukuoka Womens' University, Department of Nutrition and Health Science, Faculty of Human and Environmental Science, Associate Professor (50342829)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsTanzanian / Salt-sensitiyity / Gene / Hypertension / タンザニア青年 / ACE遺伝子多型
Research Abstract

We performed the screening of the candidate gene for salt-sensitive hypertension in young male normotensive Tanzanians. We evaluated the relation between angiotensin converting enzyme (ACE) insertion/deletion (VD) polymorphism and excessive salt intake. Moreover, to examine the epistatic gene-gene interaction and its effect on phenotype, we genotyped polymorphisms of the the CYP11B2 C-344T polymorphism, and examined the gene-gene interactions between ACE I/D and CYP11B2 C-344T polymorphisms in young male normotensive Tanzanians.
Two hundred male volunteers aged 25 to 35 were recruited from the Temeke District in Dar es Salaam. Informed consent for participation was obtained from all subjects. Subjects with cardiovascular diseases, renal diseases, and diabetes mellitus were excluded. Sixty-five, healthy male subjects participated in a 2-week intervention consisting of seven days of salt loading followed by diuretic treatment for a period of one week. In this protocol, subjects took 140 m … More Eq of NaC1 from consomme' and salt tablet supplements per day, and 25 mg of hydrochlorothiazide daily while maintaining their customary diet. At the baseline and on the last day of each period, blood and 24-hour urine were collected. Blood pressure (BP) was measured at the end point of each period. ACE DI polymorphism was detected by PCR.
To our knowledge, this study demonstrates for the first time the relationship between ACE gene polymorphism and salt sensitivity in Africans. Serum ACE activity in subjects with the DD genotype was significantly high compared with other genotypes after salt loading (DD; 20.2±6.9, DI; 16.4±5.2, II; 14.5±3.7 IU/L, p=0.023); however, mean blood pressure in DD, DI and II genotypes was not significantly different in the salt-loading phase.
From these results, we suggest that an interaction might exist between the ACE I/D polymorphism and ACE activity. No strong contribution was observed between blood pressure change and ACE gene polymorphism in the salt-loading phase in young male Tanzanians
To observed the interaction between the ACE I/D and the CYP11B2-C344T polymorphisms, the urinary sodium excretion in subjects with both CYPI1B2-344TC/CC and ACE DD genotypes was also notably higher than the other groups. When the CYP11B2 TC/CC genotype was present, urinary sodium excretion was significantly associated with a change of heart rate. In contrast, serum ACE activity in subjects with both CYP11B2-344TT and ACE DD genotypes was higher than in other genotype combinations. However, increases in serum ACE activity did not significantly affect blood pressure or heart rate.
Our results showed a gene-gene interaction between the ACE I/D and CYP11B2 C-344T polymorphisms in response to high salt intake, which regulates the initiation of the pressor effect of salt in essential hypertension. It provides a range of potential preventive and therapeutic approaches to hypertension. Less

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (9 results)

All 2007 2006

All Journal Article (3 results) Presentation (6 results)

  • [Journal Article] アフリカ人成人男性におけるアンギオテンシン変換酵素(ACE)多型2006

    • Author(s)
      安井 菜穂美, 池田 克巳, Njelekela M, Massesa Z, 他
    • Journal Title

      Therapeutic Research 27(9)

      Pages: 10-12

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] ACE gene I/D polymorphism in Young Africal Mails.2006

    • Author(s)
      Yasui N, Ikeda K, et. Al.
    • Journal Title

      Therapeutic Research. 27(9)

      Pages: 10-12

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] アフリカ人成人男性におけるアンギオテンシン変換酵素(ACE)多型2006

    • Author(s)
      安井菜穂美, 池田克巳, Njelekela M, Massesa Z 他
    • Journal Title

      Therapeutic Research. 27(9)

      Pages: 10-12

    • Related Report
      2006 Annual Research Report
  • [Presentation] Angiotensin-Converting Enzyme(ACE)Polymorphism in Young Normotensive Male Tanazanians2007

    • Author(s)
      Yasui N, Ikeda K, et. al.
    • Organizer
      China-Japan Joint Hypertension Symposium
    • Place of Presentation
      北京,中国
    • Year and Date
      2007-11-18
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Angiotensin-Converting Enzyme(ACE)Polymorphism in Young Normotensive Male Tanzanians2007

    • Author(s)
      Yasui N, K Ikeda, et. al.
    • Organizer
      China-Japan Joint Hypertension Symposium
    • Place of Presentation
      北京、中国
    • Year and Date
      2007-11-18
    • Related Report
      2007 Annual Research Report
  • [Presentation] アフリカ人青年における食塩摂取とアンギオテンシンI変換酵素(ACE)遺伝子,アルドステロン合成酵素(CYP11B2)遺伝子の関係2007

    • Author(s)
      安井 菜穂美, 池田 克巳, 他
    • Organizer
      第54回日本栄養改善学会学術総会
    • Place of Presentation
      長崎
    • Year and Date
      2007-09-20
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] アフリカ人青年における食塩摂取とアンギオテンシンI変換酵素(ACE)遺伝子、アルドステロン合成酵素(CYP11B2)遺伝子の関係2007

    • Author(s)
      安井 菜穂美、池田 克巳, 他
    • Organizer
      第54回日本栄養改善学会学術総会
    • Place of Presentation
      長崎
    • Year and Date
      2007-09-20
    • Related Report
      2007 Annual Research Report
  • [Presentation] Angiotensin-Converting Enzyme(ACE) Polymorphism in Young Normotensive Male Tanzanians.2007

    • Author(s)
      Yasui N, Njelekela M, Ikeda K, et. al.
    • Organizer
      China-Japan Joint Hypertension Symposium
    • Place of Presentation
      Beijin, China
    • Year and Date
      2007-09-18
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Relationship between ACE I/D and CYP11B2-C344T Polymorphisms in Young Male Tanzanians.2007

    • Author(s)
      Yasui N, Ikeda K, et. al.
    • Organizer
      The JapaneseSociety of Nutrition and dietics, 54th Annual Meeting
    • Place of Presentation
      Nagasaki, Japan
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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