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Skip Navigation LinksJRI > Archive > July-September 2009, Volume 10, Issue 2 > Effects of Conjugated Linoleic Acid (CLA) on Hormones and Factors Involved in Murine Ovulation



Volume 10, Issue 2, Number 39 / July-September
(pages 101-108)


Effects of Conjugated Linoleic Acid (CLA) on Hormones and Factors Involved in Murine Ovulation




 Corresponding Author
Department of Animal Physiology, Faculty of Agriculture, Islamic Azad University, Research and Science Branch, Tehran, Iran

Department of Animal Physiology, Faculty of Agriculture, Islamic Azad University, Research and Science Branch, Tehran, Iran

Department of Animal Physiology, Faculty of Agriculture, Islamic Azad University, Research and Science Branch, Tehran, Iran

Department of Parasitology, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

Received: 4/26/2009 Accepted: 6/27/2009

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Abstract
Introduction: Ovulation is a physiologic process with an inflammatory response that depends on a coordinated activity of gonadotropins and steroid hormones, as well as inflammatory mediators such as cytokines, prostaglandins, leptin, nitric oxide (NO), etc. Conjugated linoleic acid (CLA) is composed of polyunsaturated fatty acids (PUFA) found in dairy products, beef and lamb. There is strong evidence that dietary CLA affects mediators involved in ovulation. The aim of this study was to determine the effects of different doses of dietary CLA on systemic and local hormones and factors involved in ovulation.Materials and Methods: In this case-control study, 80 (50±2-day old) female mice were randomly divided into four groups (C as the controls and T1, T2 and T3 as the treatment groups). There were four replicates in each group and there were five mice in every replicate (20 mice, in total). The mice in the control group were fed with no CLA in their diet but the ones in the treatment group received 0.1, 0.3 and 0.5g/kg of CLA (replacing corn oil in the diet), respectively for 120 days. Later on, blood samples were obtained from the tails of animals that displayed estrus signs and estradiol (E2), progesterone (P4), LH, FSH, NO, leptin and TNFα were measured. Furthermore, the effects of CLA on the ovarian production of prostaglandins (PGs) and NO were investigated. The data were analyzed by SAS software. Results: CLA significantly decreased serum levels of FSH (p<0.05), LH, estradiol, NO, leptin and TNFα (p<0.01). In addition, CLA decreased progesterone levels but this effect was statistically insignificant. The significantly negative effects of CLA were seen on the ovarian production of PGE2 and PGF2α (p<0.01).

Keywords: Conjugated linoleic acid, Nitric oxide, Ovary, Ovulation, Prostaglandin, Gonadotropin


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