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Modulation of catecholamine release by endogenous adenosine in the rat adrenal medulla

  • Original Paper
  • Published:
Journal of Biomedical Science

Abstract

Adenosine was shown to inhibit norepinephrine (NE) release from sympathetic nerve endings. The purpose of this study was to examine whether endogenous adenosine restrains NE and epinephrine release from the adrenal medulla. The effects of an adenosine receptor antagonist, 1,3-dipropyl-8-(p-sulfophenyl) xanthine (DPSPX), on epinephrine and NE release induced by intravenous administration of insulin in conscious rats were examined. Plasma catecholamines were measured by HPLC with an electrochemical detector. DPSPX significantly increased plasma catecholamine in both control rats and rats treated with insulin. The effect of DPSPX on plasma catecholamine was significantly greater in rats treated with insulin. Additional experiments were performed in adrenalectomized rats to investigate the contribution of the adrenal medulla to the effect of DPSPX on plasma catecholamine. The effect of DPSPX and insulin on epinephrine in adrenalectomized rats was significantly reduced compared with that of the controls. Finally, we tested whether endogenous adenosine restrains catecholamine secretion partially through inhibiting the renin-angiotensin system. The effect of DPSPX on plasma catecholamine in rats pretreated with captopril (an angiotensin-converting enzyme inhibitor) was reduced. These results demonstrate that under basal physiological conditions, endogenous adenosine tonically inhibits catecholamine secretion from the adrenal medulla, and this effect is augmented when the sympathetic system is stimulated. The effect of endogenous adenosine on catecholamine secretion from the adrenal medulla is achieved partially through the inhibitory effect of adenosine on the renin-angiotensin system.

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Authors and Affiliations

  1. Department of Medical Education and Research, Kaohsiung Veterans General Hospital, 386 Ta-Chung 1st Road, 813, Kaohsiung, Taiwan (ROC)

    Ching-Jiunn Tseng MD, PhD, Julie Y. H. Chan, Wan-Chen Lo & Chung-Ren Jan

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  1. Ching-Jiunn Tseng MD, PhD
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  2. Julie Y. H. Chan
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  3. Wan-Chen Lo
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  4. Chung-Ren Jan
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Tseng, CJ., Chan, J.Y.H., Lo, WC. et al. Modulation of catecholamine release by endogenous adenosine in the rat adrenal medulla. J Biomed Sci 8, 389–394 (2001). https://doi.org/10.1007/BF02255947

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  • DOI: https://doi.org/10.1007/BF02255947

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