ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (1): 71-78.doi: 10.11843/j.issn.0366-6964.2016.01.010

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Distribution of Protein Gene Product 9.5 and Neuropeptide Y in Tibetan Plateau Sheep Testis at Different Ages

YUAN Li-gang*,QU Ya-ling,LU Yu-rong,LI Cong   

  1. (College of Veterinary Medicine,Gansu Agricultural University,Lanzhou 730070,China)
  • Received:2015-06-10 Online:2016-01-23 Published:2016-01-23

Abstract:

This experiment was conducted to investigate the distribution of gene product 9.5 (PGP 9.5) and neuropeptide Y (NPY) in Tibetan Plateau sheep testis and in an attempt to explore their relationships with testicular spermatogenesis at different ages.Testis from 0.5-,2-,5-,8-,12-and 18-month-old Tibetan Plateau sheep were sectioned and immunostained with antisera to the NPY and PGP 9.5.Furthermore,IPP (Image-Pro Plus) statistics methods were used to compare the average absorbance of PGP9.5 and NPY expression in all of these testis.The testicular parenchyma did not show any NPY- and PGP9.5-containing immunoreactivity in 0.5-month-old sheep,and very scattered immunoreactivities were present within the gonocytes,but the expression of PGP9.5 in testis of 2-month-old sheep was significantly stronger than NPY at the same age (P<0.01),both of the PGP9.5 and NPY were strongly present in 18-month-old sheep(P<0.01).By contrast,no expression of NPY and PGP9.5 immunoreactivities were observed within the primary spermatocytes in 18-month-old sheep.The expression of PGP9.5 in Sertoli cells underlie age-related declines,which was poorly investigated at 12-month-old and no expression at 18-month-old,but they were obviously detected in Leydig cells and vscellum at different ages.The NPY expression in Leydig cells were also poorly investigated,and were mainly expressed in Sertoli cells in 2-month-old sheep testis,and after that,the expression of NPY in vscellum with a manner of age-related enhances.The results suggest that the PGP9.5 and NPY expression was significantly difference in Tibetan Plateau sheep testis at different ages might serve as regulators for the testicular functions,also the expression of PGP9.5 in Leydig cells in the testis reflect the functional regulates of testosterone.Namely,the distribution of NPY in the wall of testis vascular significantly stronger in a manner of age-related increase may provide new indexes for the research of plateau adaptability mechanism in testicular blood regulation,and play a role in the local microcirculation and the interactions with the Sertoli cells.

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