Augmented contractility to noradrenaline in femoral arteries from the otsuka long-evans tokushima fatty rat, a model of type 2 diabetes

Shota Kobayashi, Takayuki Matsumoto, Makoto Ando, Maika Iguchi, Kumiko Taguchi, Tsuneo Kobayashi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Although vasculopathies may occur systemically, there are few reports regarding femoral arteries of type 2 diabetes. Here, we investigated whether contractile response to noradrenaline in femoral arteries would change in type 2 diabetic male Otsuka Long-Evans Tokushima Fatty (OLETF) rat at the chronic stage of disease (1 year old) versus age-matched control Long-Evans Tokushima Otsuka (LETO) rat. OLETF rat exhibited hyperglycemia, hypertension, hyperlipidemia, and hypoinsulinemia compared to age-matched LETO rat. Noradrenaline-induced contraction was increased in femoral arteries in OLETF rats compared with LETO rats whereas serotonin- or phenylephrine-induced contractions were similar between these two animals. Acetylcholine- and sodium nitroprusside-induced relaxations were similar between the two groups. Very small relaxations in femoral arteries induced by clonidine and isoprenaline were obtained in LETO but not OLETF group. Noradrenaline-induced contraction was enhanced by treatment with NG-nitro-L-arginine (L-NNA), a nitric oxide synthase (NOS) inhibitor, and the between-group difference of contraction was eliminated by such treatment. Indomethacin, a non-selective cyclooxygenase (COX) inhibitor, reduced noradrenaline-induced contraction in both groups, whereas the contraction was greater in OLETF group versus LETO. Femoral arterial protein expression of endothelial NOS, COX-1, and superoxide dismutases were similar between the two groups, whereas reduction of COX-2 expression was seen in OLETF group compared with LETO. Increased contractile responsiveness to noradrenaline is seen in OLETF rat femoral artery and this may be due to reduction of suppressive effect of NO.

Original languageEnglish
Pages (from-to)2061-2067
Number of pages7
JournalBiological and Pharmaceutical Bulletin
Volume40
Issue number12
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Contraction
  • Cyclooxygenase (COX)
  • Diabetes
  • Endothelial nitric oxide synthase (NOS)
  • Femoral artery

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science

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