Effects of a Western diet versus high glucose on endothelium-dependent relaxation in murine micro- and macro-vasculature

Anthie Ellis, Zhong Jian Cheng, Yang Li, Yan Fen Jiang, Jing Yang, Malarvannan Pannirselvam, Hong Ding, Morley D. Hollenberg, Christopher Triggle

Research output: Contribution to journalArticle

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Abstract

Vascular contractility and endothelium-dependent vasodilatation were studied in mesenteric, aorta and coronary vasculature from male and female LDL receptor deficient (LDLR-/-) and wild type C57BL/6 mice fed either a high-fat Western Diet (WD) or regular animal chow (RD). Endothelium-dependent vasodilatation was also studied in small mesenteric arteries and aorta from C57BL/6 mice following a 20 h exposure in vitro to 30 mM glucose. Compared with RD-fed animals, WD-fed LDLR-/- animals had increased body weights, elevated triglycerides and total cholesterol, but not glucose. Control C57BL6 animals had elevated body weight without increased cholesterol, triglyceride or glucose levels. The contractile sensitivity to cirazoline (pD2) of small mesenteric arteries was the same for RD-fed LDLR-/- and RD-fed C57BL6 mice, but was reduced in WD-fed male LDLR-/- and WD-fed female C57BL/6 mice. Maximum mesenteric contractile values for cirazoline (Emax) were unchanged; however, the Emax for phenylephrine in the aorta from WD-fed male C57BL/6 (but not LDLR-/- or female C57BL/6) mice was reduced. The Emax for acetylcholine-mediated endothelium-dependent vasodilatation in micro- and macro vessels (small mesenteric artery, coronary artery and aorta) from WD-fed LDLR-/- and C57BL/6 mice was unaltered, in contrast to the reduction in Emax for glucose-exposed tissues. Furthermore, the component of acetylcholine-mediated vasodilatation resistant to the combination of inhibitors of nitric oxide synthase, cyclooxygenase and guanylyl cyclase (nitro L-arginine methyl ester - 100 μM; indomethacin 10 μM and 1H-[1,2,4]-oxadiazolo[4,3,-a]quinoxalin-1-one, ODQ - 10 μM, respectively) was generally greater in WD-fed mice. Thus, vasculature from WD-fed mice with short-term dyslipidaemia do not exhibit reduced endothelium-dependent vasodilatation, but the WD is associated with changes in the overall endothelial-dependent relaxation and contractile responses thus suggesting an impact of diet rather than dyslipidaemia on cellular signalling pathways in vascular tissue. In contrast, acute hyperglycaemia resulted in endothelial dysfunction in both small mesenteric arteries and thoracic aorta.

Original languageEnglish
Pages (from-to)111-117
Number of pages7
JournalEuropean Journal of Pharmacology
Volume601
Issue number1-3
DOIs
Publication statusPublished - 28 Dec 2008
Externally publishedYes

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Endothelium
LDL Receptors
Glucose
Inbred C57BL Mouse
Vasodilation
Mesenteric Arteries
Aorta
Dyslipidemias
Acetylcholine
Triglycerides
Cholesterol
Body Weight
Western Diet
Guanylate Cyclase
Vascular Endothelium
High Fat Diet
Phenylephrine
Prostaglandin-Endoperoxide Synthases
Thoracic Aorta
Nitric Oxide Synthase

Keywords

  • (Mouse)
  • Endothelium-dependent vasodilatation
  • Hyperglycaemia
  • Hyperlipidaemia
  • LDL-receptor deficient mouse
  • Western diet

ASJC Scopus subject areas

  • Pharmacology

Cite this

Effects of a Western diet versus high glucose on endothelium-dependent relaxation in murine micro- and macro-vasculature. / Ellis, Anthie; Cheng, Zhong Jian; Li, Yang; Jiang, Yan Fen; Yang, Jing; Pannirselvam, Malarvannan; Ding, Hong; Hollenberg, Morley D.; Triggle, Christopher.

In: European Journal of Pharmacology, Vol. 601, No. 1-3, 28.12.2008, p. 111-117.

Research output: Contribution to journalArticle

Ellis, Anthie ; Cheng, Zhong Jian ; Li, Yang ; Jiang, Yan Fen ; Yang, Jing ; Pannirselvam, Malarvannan ; Ding, Hong ; Hollenberg, Morley D. ; Triggle, Christopher. / Effects of a Western diet versus high glucose on endothelium-dependent relaxation in murine micro- and macro-vasculature. In: European Journal of Pharmacology. 2008 ; Vol. 601, No. 1-3. pp. 111-117.
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