Disrupted Regulation of Ghrelin Production Under Antihypertensive Treatment in Spontaneously Hypertensive Rats

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  • Hamada Naokazu
    Department of Digestive and Life-Style Related Disease, Health Research Course, Human and Environmental Sciences, Kagoshima University Graduate School of Medicine and Dental Sciences
  • Nishi Yoshihiro
    Department of Physiology, Kurume University School of Medicine
  • Tajiri Yuji
    Division of Endocrinology and Metabolism, Kurume University School of Medicine
  • Setoyama Kentaro
    Frontier Science Research Center, Kagoshima University
  • Kamimura Ryozo
    Frontier Science Research Center, Kagoshima University
  • Miyahara Kenkichi
    Division of Cardiology, Shinkyo Hospital
  • Nuruki Norihito
    Department of Digestive and Life-Style Related Disease, Health Research Course, Human and Environmental Sciences, Kagoshima University Graduate School of Medicine and Dental Sciences
  • Hosoda Hiroshi
    Department of Biochemistry, National Cerebral and Cardiovascular Center Research Institute
  • Kangawa Kenji
    Department of Biochemistry, National Cerebral and Cardiovascular Center Research Institute
  • Kojima Masayasu
    Institute of Life Science, Kurume University
  • Mifune Hiroharu
    Institute of Animal Experimentation, Kurume University School of Medicine

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Abstract

Background: Ghrelin is an acylated peptide hormone mainly secreted from the stomach. When administrated externally it modulates vascular tone mainly through the regulation of autonomic nerve activity. However, the effects of blood pressure (BP) on the production and secretion of ghrelin remain to be clarified. Methods and Results: We examined the stomach and plasma levels of ghrelin in spontaneously hypertensive (SHR) and Wistar-Kyoto (WKY) rats after a 4-week-intervention with antihypertensive agents (candesartan-cilexetil [ARB], doxazosin [DZN], metoprolol [MP], reserpine [RES]) to clarify the influence of BP on the secretion of ghrelin. The effect of these agents on ghrelin production and secretion were examined by comparing vehicle-treated controls (WKY-Intact, SHR-Intact). Treatment with the 4 antihypertensive drugs all yielded a significant decline in systolic BP in both SHR and WKY. Under these conditions, significantly lower levels of stomach and plasma ghrelin were detected in WKY treated with ARB (P<0.05), DZN (P<0.05), MP (P<0.05) and RES (P<0.05) compared with WKY-Intact, whereas no significant change in the ghrelin levels in the stomach and plasma were detected in SHR under the same treatments. Conclusions: The findings imply that the production and secretion of ghrelin are controlled by the ambient vascular tone and vice versa in normotensive WKY. This inter-relationship between ghrelin and BP seems to be disrupted in SHR. (Circ J 2012; 76: 1423-1429)<br>

Journal

  • Circulation Journal

    Circulation Journal 76 (6), 1423-1429, 2012

    The Japanese Circulation Society

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