Refereed journal article or data article (A1)

Kisspeptin-52 partially rescues the activity of the hypothalamus-pituitary-gonadal axis in underweight male rats dosed with an anti-obesity compound




List of Authors: Bolze F, Williams H, Bhuwania R, Egecioglu E, Bloem E, Paulsson JF, Pedersen MO, Broadmeadow A, Chesher CJ, Moore EL, Skydsgaard M, Galle PS, Dalgaard M, Wulff BS, Tena-Sempere M, Andersen LW

Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE

Publication year: 2020

Journal: Toxicology and Applied Pharmacology

Journal name in source: TOXICOLOGY AND APPLIED PHARMACOLOGY

Journal acronym: TOXICOL APPL PHARM

Volume number: 404

Number of pages: 13

ISSN: 0041-008X

DOI: http://dx.doi.org/10.1016/j.taap.2020.115152


Abstract
Energy metabolism and reproduction are closely linked and reciprocally regulated. The detrimental effect of underweight on reproduction complicates the safety evaluation of anti-obesity drugs, making it challenging to distinguish pathological changes mediated through the intended drug-induced weight loss from direct drug effects on reproductive organs. Four-weeks dosing of normal weight Sprague Dawley rats with a glucagon-like peptide 1 (GLP-1)/glucagon receptor co-agonist induced a robust weight loss, accompanied by histological findings in prostate, seminal vesicles, mammary glands, uterus/cervix and vagina. Characterization of the hypothalamus-pituitary-gonadal (HPG) axis in male rats revealed reduced hypothalamic Kiss1 mRNA levels and decreased serum luteinizing hormone (LH) and testosterone concentrations following co-agonist dosing. These alterations resemble hypogonadotropic hypogonadism typically seen in adverse energy deprived conditions, like chronic food restriction. Concomitant daily administration of kisspeptin-52 from day 21 to the end of the four-week co-agonist dosing period evoked LH and testosterone responses without normalizing histological findings. This incomplete rescue by kisspeptin-52 may be due to the rather short kisspeptin-52 treatment period combined with a desensitization observed on testosterone responses. Concomitant leptin treatment from day 21 did not reverse co-agonist induced changes in HPG axis activity. Furthermore, a single co-agonist injection in male rats slightly elevated LH levels but left testosterone unperturbed, thereby excluding a direct acute inhibitory effect on the HPG axis. Our data suggest that the reproductive phenotype after repeated co-agonist administration was driven by the intended weight loss, however, we cannot exclude a direct organ related effect in chronically treated rats.


Last updated on 2021-24-06 at 08:41