Effect of postprandial hyperglycemia and hyperinsulinemia on vascular responsiveness

Yoshito Zamami, Shingo Takatori, Yukiko Iwatani, Kousuke Yamawaki, Satoko Miyashita, Nana Yabumae, Fusako Takayama, Mitsunobu Mio, Hiromu Kawasaki

Research output: Contribution to journalReview article

Abstract

Recent clinical studies demonstrated that transient postprandial hyperglycemia and hyperinsulinemia may contribute to the development of hypertension. Therefore, we investigated influence of acute hyperglycemia and/or hyperinsulinemia induced by glucose or insulin infusion on neuronal and humoral control of vascular tone in rats. Euglycemic male Wistar rats were pithed under anesthesia and arterial blood pressure was measured. Changes in vascular responses to spinal cord stimulation (SCS) and intravenous bolus injections of noradrenaline, angiotensin II, calcitonin generelated peptide (CGRP), acetylcholine and sodium nitroprusside (SNP) were studied by infusing various concentration of glucose or insulin. Continuous glucose infusion, which increased both blood glucose and serum insulin levels, significantly augmented adrenergic nerve-mediated pressor responses to SCS without affecting injection of pressor responses to noradrenaline or angiotensin II. In pithed rats with artificially increased blood pressure and blockade of autonomic outflow, glucose infusion attenuated CGRPergic nerve-depressor responses to SCS without affecting depressor responses to injection of CGRP, acetylcholine or SNP. In pithed rats treated with octreotide, which increased blood glucose without increasing serum insulin levels, glucose infusion caused only significant augmentation of adrenergic nerve-mediated pressor responses. Combined infusion of insulin and glucose, which resulted in increased serum insulin levels with euglycemic, significantly augmented adrenergic nerve-mediated pressor responses and attenuated CGRPergic nerve-mediated depressor responses. The present results suggest that acute hyperglycemia and hyperinsulinemia increases adrenergic nerve-mediated vasoconstriction, which is partly associated with the blunted CGRPergic nerve function, and that plasma insulin concentration associated with hyperglycemia may be responsible for alteration of neuronal vascular regulation.

Original languageEnglish
Pages (from-to)419-424
Number of pages6
JournalYakugaku Zasshi
Volume128
Issue number3
DOIs
Publication statusPublished - Mar 1 2008

Keywords

  • Calcitonin gene-related peptide nerve
  • Hyperglycemia
  • Hyperinsulinemia

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science

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    Zamami, Y., Takatori, S., Iwatani, Y., Yamawaki, K., Miyashita, S., Yabumae, N., Takayama, F., Mio, M., & Kawasaki, H. (2008). Effect of postprandial hyperglycemia and hyperinsulinemia on vascular responsiveness. Yakugaku Zasshi, 128(3), 419-424. https://doi.org/10.1248/yakushi.128.419