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International Journal of Endocrinology
Volume 2012, Article ID 637825, 11 pages
http://dx.doi.org/10.1155/2012/637825
Research Article

Compromised Rat Testicular Antioxidant Defence System by Hypothyroidism before Puberty

1Departments of Zoology and Biotechnology, Utkal University, Bhubaneswar, 751004 Orissa, India
2KTRDC, College of Agriculture, University of Kentucky, Lexington, KY 40546-0236, USA

Received 25 July 2011; Accepted 10 October 2011

Academic Editor: Daniela Jezova

Copyright © 2012 Dipak K. Sahoo and Anita Roy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Altered thyroid function during early stages of development is known to affect adversely testicular growth, physiology, and antioxidant defence status at adulthood. The objective of the present study is to investigate the modulation of antioxidant defence status in neonatal persistent hypothyroid rats before their sexual maturation and also to identify the specific testicular cell populations vulnerable to degeneration during neonatal hypothyroidism in immature rats. Hypothyroidism was induced in neonates by feeding the lactating mother with 0.05% 6-n-propyl-2-thiouracil (PTU) through the drinking water. From the day of parturition till weaning (25 day postpartum), the pups received PTU through mother's milk (or) drinking water and then directly from drinking water containing PTU for the remaining period of experimentation. On the 31st day postpartum, the animals were sacrificed for the study. An altered antioxidant defence system marked by elevated SOD, CAT, and GR activities, with decreased GPx and GST activities were observed along with increased protein carbonylation, disturbed redox status in hypothyroid immature rat testis. This compromised testicular antioxidant status might have contributed to poor growth and development by affecting the spermatogenesis and steroidogenesis in rats before puberty as indicated by reduced germ cell number, complete absence of round spermatids, decreased seminiferous tubule diameter, and decreased testosterone level.