| Autor: |
Santos LC; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Dos Anjos Cordeiro JM; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Cunha MCDSG; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Santos BR; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Oliveira LS; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., da Silva AL; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Barbosa EM; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Niella RV; Veterinary Hospital, Department of Agricultural and Environmental Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., de Freitas GJC; Department of Microbiology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil., Santos DA; Department of Microbiology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil., Serakides R; Department of Veterinary Clinic and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil., Ocarino NM; Department of Veterinary Clinic and Surgery, Veterinary School, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil., Borges SC; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., de Lavor MSL; Veterinary Hospital, Department of Agricultural and Environmental Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil., Silva JF; Electron Microscopy Center, Department of Biological Sciences, State University of Santa Cruz, Campus Soane Nazare de Andrade, Ilheus 45662-900, Brazil. |
| Abstrakt: |
Hypothyroidism compromises the testicular redox status and is associated with reduced sperm quality and infertility in men. In this regard, studies have demonstrated the antioxidant potential of kisspeptin in reproductive and metabolic diseases. In this study, we evaluate the effects of kisspeptin-10 (Kp10) on the testicular redox, as well as mediators of the unfolded protein response (UPR) in adult rats with hypothyroidism. Adult male Wistar rats were randomly separated into the Control ( n = 15), Hypo ( n = 13) and Hypo + Kp10 ( n = 14) groups, and hypothyroidism was induced with 6-propyl-2-thiouracil (PTU) for three months. In the last month, half of the hypothyroid animals received Kp10. Testis samples were collected for enzymatic, immunohistochemical and/or gene evaluation of mediators of oxidative stress (TBARs, lipid hydroperoxides (LOOH), ROS, peroxynitrite, SOD, CAT and GPX), endoplasmic reticulum stress (GRP78, ATF6, PERK, CHOP, HO-1 and sXBP1) and antiapoptocytes (BCL-2). Hypothyroidism increased apoptosis index, TBARS and LOOH concentrations, and reduced testicular gene expression of Sod1 , Sod2 and Gpx1 , as well as the expression of Grp78 , Atf6 , Ho1 and Chop . Treatment with Kp10, in turn, reduced testicular apoptosis and the production of peroxynitrite, while increased SOD1 and GPX ½ expression, and enzymatic activity of CAT, but did not affect the lower expression of UPR mediators caused by hypothyroidism. This study demonstrated that hypothyroidism causes oxidative stress and dysregulated the UPR pathway in rat testes and that, although Kp10 does not influence the low expression of UPR mediators, it improves the testicular redox status, configuring it as an important antioxidant factor in situations of thyroid dysfunction. |
