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. 2005 Dec 21;245(1-2):111-20.
doi: 10.1016/j.mce.2005.11.004. Epub 2005 Dec 15.

The regulated expression of c-IAP1 and c-IAP2 during the rat seminiferous epithelial cycle plays a role in the protection of germ cells from Fas-mediated apoptosis

Yangyang Wang  1 , Janne S Suominen, Martti Parvinen, Adolfo Rivero-Muller, Sanne Kiiveri, Markku Heikinheimo, Ian Robbins, Jorma Toppari
Affiliations

The regulated expression of c-IAP1 and c-IAP2 during the rat seminiferous epithelial cycle plays a role in the protection of germ cells from Fas-mediated apoptosis

Yangyang Wang et al. Mol Cell Endocrinol. .

Abstract

The inhibitor of apoptosis proteins, c-IAP1 and c-IAP2, are highly expressed in rat testis and potentially play a regulatory role in testicular apoptosis. To better understand their functions during spermatogenesis, we have analyzed their spatio-temporal distribution in rat testis, how their expression is controlled by the paracrine stem-cell factor (SCF) and how they affect Fas-mediated apoptosis. Both c-IAP1 and c-IAP2 showed cycles of transcriptional expression, throughout the seminiferous epithelial cycle. c-IAP1 protein showed a diffuse nuclear distribution in type B spermatogonia, preleptotene, leptotene, and zygotene spermatocytes. In pachytene spermatocytes, c-IAP1 colocalized with SUMO-1 in the XY-body. c-IAP2 protein was cytoplasmic in spermatocytes, from stage VI pachytene onwards, round spermatids, elongated spermatids and Leydig cells. Its expression was upregulated by SCF. Inhibition of IAP activity resulted in a greater sensitivity of germ cells to Fas-mediated apoptosis. These results suggest an important role for IAPs in the regulation of spermatogenic apoptosis.

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