Abstract
The effect of increased serum levels of thyroid hormone (triiodothyronine, T3) on young rat testis spermatogenesis was studied by analysing molecular and morphological parameters. Hyperthyroidism was induced by either T3-treatment or 2- and 10-day cold exposure. The poly(ADP-ribosyl)ation of proteins catalysed by poly(ADP-ribose) polymerase, which is particularly active at specific stages of rat spermatogenesis, was analysed as molecular index of DNA damage and cell stress. Poly(ADP-ribose) polymerase activity rose after both T3-treatment and 2- and 10-day cold exposure, with a trend of 10-day cold-exposed rats towards control values. In all hyperthyroid rats poly(ADP-ribose) turnover, as a contribution of both poly(ADP-ribose) polymerase and poly(ADP-ribose) glycohydrolase), was enhanced with respect to euthyroid animals. Poly(ADP-ribosyl)ation of proteins occurred with long and branched polymers suggesting an increased involvement of the modification system in DNA repair. Morphological changes of germ tissue were observed in hyperthyroid rats, mainly a high reduction of mature cells in the seminiferous tubule, and evidence of germ cell apoptosis was obtained by TUNEL method. In control animals germ cell apoptosis was within physiological levels. Conversely, in hyperthyroid rats a dramatic increase in the number of TUNEL-positive cells (some spermatogonia and numerous primary spermatocytes) was found, even though the increase was lower in 10-day than in 2-day cold-exposed animals.
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Acknowledgments
This work was financially supported by Ministero Istruzione, Universita’ e Ricerca (MIUR; Progetti di Rilevante Interesse Nazionale, PRIN 2003/2005). We wish to thank Dr Elena Porzio for technical assistance.
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Faraone-Mennella, M.R., Ferone, A., Marino, L. et al. Poly(ADP-ribosyl)ation of proteins and germ cell development in hyperthyroid rat testes. Mol Cell Biochem 323, 119–129 (2009). https://doi.org/10.1007/s11010-008-9970-7
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DOI: https://doi.org/10.1007/s11010-008-9970-7