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  • Title: Expression of cysteine sulfinate decarboxylase (CSD) in male reproductive organs of mice.
    Author: Li JH, Ling YQ, Fan JJ, Zhang XP, Cui S.
    Journal: Histochem Cell Biol; 2006 Jun; 125(6):607-13. PubMed ID: 16252094.
    Abstract:
    Cysteine sulfinate decarboxylase (CSD) is the rate-limiting biosynthetic enzyme of taurine, but it is still controversial whether the male reproductive organs have the function to synthesize taurine through CSD pathway. The present study was thus undertaken to detect CSD expression in male mouse reproductive organs by RT-PCR, Western blot and immunohistochemistry. The results show that CSD is expressed both at the mRNA and protein levels in the testis, epididymis and ductus deferens. The relative levels of both CSD mRNA and protein increase from the testis to the epididymis and to the ductus deferens. Immunohistochemical results demonstrate that the main cell types containing CSD are Leydig cells of testis, epithelial cells and some stromal cells throughout the efferent ducts, epididymis and ductus deferens. These results suggest that male genital organs have the function to produce taurine through the CSD pathway, although quantifying the relation of CSD expression to taurine synthesis and the exact functions of taurine in male genital organs still need to be elucidated in future studies.
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