Melatonin normalizes clinical and biochemical parameters of mild inflammation in diet-induced metabolic syndrome in rats.

The objective of this study was to evaluate the efficacy of melatonin to affect mild inflammation in the metabolic syndrome (MS) induced by a high-fat diet in rats. Adult Wistar male rats were divided into four groups (n = 16/group): (i) control diet (3% fat); (ii) high-fat (35%) diet; (iii) high-fat diet + melatonin; and (iv) melatonin. Rats had free access to high-fat or control chow and one of the following drinking solutions for 10 wk: (a) tap water; (b) 25 μg/mL of melatonin. Plasma interleukin (IL)-1β, IL-4, IL-6, IL-10, tumor necrosis factor (TNF)-α, interferon (IFN)-γ, and C-reactive protein (CRP) were measured at two time intervals, that is, the middle of daylight period and the middle of the scotophase. In addition, a number of somatic and metabolic components employed clinically to monitor the MS were measured. Melatonin decreased the augmented circulating levels of IL-1β, IL-6, TNF-α, IFN-γ, and CRP seen in obese rats and restored the depressed levels of IL-4 and IL-10. Rats fed with the high-fat diet showed significantly higher body weights and augmented systolic blood pressure from the third and fourth week onwards, respectively, melatonin effectively preventing these changes. In high-fat-fed rats, circulating low-density lipoprotein-cholesterol, total cholesterol, and triglyceride concentration augmented significantly, melatonin being effective to counteract these changes. Melatonin-treated rats showed a decreased insulin resistance, the highest values of plasma high-density lipoprotein-cholesterol, and the lowest values of plasma uric acid. The results indicate that melatonin is able to normalize the altered biochemical pro-inflammatory profile seen in rats fed with a high-fat diet.
AuthorsPilar Cano Barquilla, Eleonora S Pagano, Vanesa Jiménez-Ortega, Pilar Fernández-Mateos, Ana I Esquifino, Daniel P Cardinali
JournalJournal of pineal research (J Pineal Res) Vol. 57 Issue 3 Pg. 280-90 (Oct 2014) ISSN: 1600-079X [Electronic] England
PMID25113124 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Copyright© 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Chemical References
  • Melatonin
  • Animals
  • Inflammation (metabolism, pathology)
  • Male
  • Melatonin (pharmacology)
  • Metabolic Syndrome X (metabolism, pathology)
  • Rats
  • Rats, Wistar

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