Temperature dependent expression of cdc2 and cyclin B1 in spermatogenic cells during spermatogenesis  

作　　者：KONG WEI HUA ZHENG GU JI NING LU JIA KE TSO Shanghai Institute of Planned Parenthood Research, Shanghai 200032, China College of Life Science, Shandong University, Jinan 250100, China 

出　　处：《Cell Research》2000年第4期289-302,共14页细胞研究（英文版）

基　　金：National Natural Science FOundation of China.Grant! Nos: 39770370, 39630160;We are grateful to Dr. A. Koff and Dr. J. Pines f

摘　　要：p34cdc2 and Cyclin B1 are key components of cell cycle controlling machine and are believed to play a fundamental role in gametogenesis. It is also well known that, in scrotal mammals, spermatogenesis depends greatly on the maintenance of comparatively low temperature in the scrotum. To investigate whether the expression of cdc2 and Cyclin B1 in spermatogenic cells during spermatogenesis is actually a temperature dependent event, in situ hybridization, Western blotting and immunohistochemistry analysis were used to study the expression of cdc2 and Cyclin B1 in normal and cryptorchid testis. Results showed that the abdominal temperature had no significant influence on the transcription of cdc2 and Cyclin B1 in the spermatogonia and pachytene/diplotene primary spermatocytes, but it blocked the translation of them. Due to the deficiency of p34cdc2 and Cyclin B1, the spermatogonia and pachytene/diplotene primary spermatocytes were unable to form MPF, hence, they couldn’t undergo karyokinesis. The development of primary spermatocytes was arrested at the G2 to M phase transition. We also found that testosterone could regulate the Cyclin B1 expression in spermatogenic cells. Muscular injection of testosterone could recover spermatogenesis in the unilateral scrotal testis which was influenced by the contralateral cryptorchid testis, but it could not salvage the spermatogenesis block in the cryptorchid testis.

关 键 词：TEMPERATURE SPERMATOGENESIS CDC2 cyclin B8 

分 类 号：Q25[生物学—细胞生物学]