Ghosh H, Rai S, Manzar MD, Pandi-Perumal SR, Brown GM, Reiter RJ, Cardinali DP. Differential expression and interaction of melatonin and thyroid hormone receptors with estrogen receptor α improve ovarian functions in letrozole-induced rat polycystic ovary syndrome.
Life Sci 2021;
295:120086. [PMID:
34710445 DOI:
10.1016/j.lfs.2021.120086]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 10/13/2021] [Accepted: 10/19/2021] [Indexed: 02/07/2023]
Abstract
AIMS
The objective of the present study was to investigate the effect of melatonin and L-thyroxine (T4) on the expression of various receptors, and some metabolic, reproductive, and gonadotropic hormones in letrozole-induced polycystic ovary syndrome (PCOS) in rats.
MATERIAL AND METHODS
Assessment of gravimetric, hormonal profile and thyroid histology and relative expression of melatonin receptors (MT1, MT2) and estrogen receptor α (Erα) in thyroid and ovary, and type II iodothyronine deiodinase (Dio2) and thyroid hormone receptor α (TRα) in ovary were done according to standard protocols.
KEY FINDINGS
A significant increase in thyroid follicles numbers was noted in the hyperthyroid rat. T4 treatment to PCOS showed the expected increment in the circulating level of triiodothyronine (T) and T4. Melatonin and T4 treatment of PCOS rats resulted in a significant decrease in the circulating level of T3 and T4. Hyperthyroid rats showed a decrement in plasma melatonin levels. However, T4 treatment to PCOS rats showed increased circulating melatonin levels, and a decrease in the circulating level of gonadotropins (LH and FSH), and testosterone. Melatonin treatment to PCOS-hyperthyroid rats resulted in the normal expression of ovarian and thyroid MT1 and ERα, receptors, which had been altered in PCOS and hyperthyroid rats, without any significant change in the MT2 receptor.
SIGNIFICANCE
The present findings suggest a fine interplay and cross-talk via melatonin and its two receptors with ERα, TRα, and Dio2 in thyroid and ovarian tissue during PCOS and hyperthyroidism pathogenicity.
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