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Increased systolic blood pressure associated with hypertriglyceridemia in female Sprague-Dawley rats.

Authors
  • Mogane, Conrad1, 1
  • Mokotedi, Lebogang P1, 1
  • Millen, Aletta M E1, 1
  • Michel, Frederic S1, 1
  • 1 Cardiovascular Pathophysiology and Genomics Research Unit, School of Physiology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa. , (South Africa)
Type
Published Article
Journal
Canadian Journal of Physiology and Pharmacology
Publisher
Canadian Science Publishing
Publication Date
Jun 27, 2019
Pages
1–9
Identifiers
DOI: 10.1139/cjpp-2019-0121
PMID: 31247146
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The effect of hyperlipidemia on the cardiovascular system is uncertain in females. The aim of the present study was to determine whether administration of a lipogenic diet alters cardiovascular parameters in female rats. Fifty female Sprague-Dawley rats were assigned into 2 groups of rats receiving a standard or a high-fat, high-sucrose diet (HFHS) for 6 weeks (n = 25 per group). Body mass, blood lipids concentrations, triglycerides clearance, blood pressures (BPs), systolic and diastolic functions, as well as vascular reactivity were assessed at the end of the diet intervention. At termination, body mass was similar between the 2 groups. Fasting blood triglycerides concentration (BTG) was greater in the HFHS group. Triglycerides clearance was impaired in the HFHS group. High-density lipoprotein (HDL) cholesterol concentration was lower in the HFHS group. The early-to-late diastolic filling velocity ratio (E/A) was lower in the HFHS group and negatively associated with BTG. The sensitivity (EC50) of mesenteric arteries to phenylephrine was greater in HFHS and was negatively associated with BTG, but not HDL. Systolic BP was higher in the HFHS group and was positively associated with BTG and HDL. The association between systolic BP and BTG was independent of other lipids measured. In conclusion, hypertriglyceridemia may have increased resistance arteries responsiveness to alpha-agonist and systolic BP in female rats.

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