Effects of scrotal insulation and pathological lesions on α-smooth muscle actin (SMA) and vimentin in the bull testes

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  • DEVKOTA Bhuminand
    The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Theriogenology, Department of Applied Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine Institute of Agriculture and Animal Science, Tribhuvan University
  • SASAKI Motoki
    The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Anatomy, Department of Basic Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • MATSUI Motozumi
    The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Theriogenology, Department of Applied Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • TAKAHASHI Ken-Ichi
    Genetics Hokkaido
  • MATSUZAKI Shigenori
    Genetics Hokkaido
  • KOSEKI Tsugio
    National Livestock Breeding Center
  • MIYAKE Yoh-Ichi
    The United Graduate School of Veterinary Sciences, Gifu University Laboratory of Theriogenology, Department of Applied Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine

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タイトル別名
  • Effects of Scrotal Insulation and Pathological Lesions on .ALPHA.-Smooth Muscle Actin (SMA) and Vimentin in the Bull Testes
  • Effects of scrotal insulation and pathological lesions on a smooth muscle actin SMA and vimentin in the bull testes

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抄録

The expression patterns of α-smooth muscle actin (SMA) and vimentin in the bovine testis indicate the maturation status of seminiferous tubules. The present study demonstrates the effects of impaired spermatogenesis resulting from increased testicular temperature after scrotal insulation and pathological lesions in subfertile bull testes on the changes in immunohistochemical expression of α-SMA and vimentin. Scrotal insulation induced degenerative changes of seminiferous tubules, and subfertile bull testes demonstrated characteristic mixed atrophied lesions; dysplastic lesions were seen in one bull. The increased intensity of peritubular α-SMA in the dysplastic area was distinct and indicated shrinkage of the seminiferous tubules. The mixed atrophied lesions revealed unaltered expression of peritubular α-SMA. However, considerable distortion was observed in the expression of α-SMA in severely degenerated tubules after insulation, which may indicate the heat sensitivity of peritubular α-SMA or its relation with spermatogenic activity under sudden heat stress. The vimentin expression pattern in the degenerated tubules of post-insulated testes was unaltered. However, the Sertoli cell-only tubules of mixed atrophied subfertile bull testes were characterized by an increase in vimentin of strong intensity resembling that in the transforming pattern, which may indicate the reversion of Sertoli cell maturity in such cases.<br>

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