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Changes in Serum IGF-I and Spermatogenesis Analysed by Flow Cytometry in Growing Male Rabbit  

Lee J. H. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
Kim C. K. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
Chang Y. M. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
Ryu J. W. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
Park M. Y. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
Chung Y. C. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
Pang M. G. (Department of Animal Science & Technology, Chung-Ang University, BET Research Institute)
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Abstract
The aim of this study was to investigate the changes in insulin-like growth factor-I (IGF-I) and growth hormone (GH) in serum, the quantitation of spermato-genesis and the comparable relationships among these measurements during pubertal period in New Zealand White male rabbits. To investigate the age-related testicular changes in DNA contents of spermatogenic cells, the fine-needle testicular biopsies from males aged 10 to 28 wks were evaluated by flow cytometry(FCM). Body weight increased significantly between the ages of 12 and 20 wks (P<0.05) and reached 3.4 kg at 28 wks of age. The highest serum IGF-I level (451.3ng/mL) was observed at 20wks of age (P<0.05) and thereafter remained stable at low levels. Serum GH level at 18 wks of age was 183.3 pg/mL which was significantly higher compared to the other ages (P<0.05), and the rising time in serum GH tend to be somewhat earlier than that of IGF-I. The relative percentage of It-cells in testicular cell compartments was $48.2\%$ at the age of 18 wks which significantly increased than those of 16-wk-old (P<0.05) and thereafter increased with the advance of age to $68\%$. The percentage of 2C-cells in testis was $26.8\%$ at 18 wks of age which was significantly lower than $54.3\%$ at 16 wks old (P<0.05). The percentage of 4C-cells was constantly maintained $2\~6\%$ except the $9.9\%$ at 18 wks of age. In conclusion, the results suggest that the puberty onset occurred at about the 18 wks of age and that the IGF-I and GH in serum during the pubertal period showed the age/growth-specific changes and these changes might be related to the spermatogenesis. The DNA FCM combined with fine-needle testicular biopsy could offer a very sensitive method to monitor the quantitative spermatogenic events related to the puberty onset.
Keywords
Flow cytometry; IGF-I; Puberty; Rabbit; Spermatogenesis;
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