NDLI: The synthesis and role of taurine in the Japanese eel testis

Content Provider	Springer Nature Link
Author	Higuchi, Masato Celi, Fritzie T. Tamai, Ayako Miura, Chiemi Miura, Takeshi
Copyright Year	2011
Abstract	In teleost fish, the progestin 17α, 20β-dihydroxy-4-pregnen-3-one (DHP) is an essential component of the spermatogenesis pathway. In a series of investigations on the mechanisms underlying progestin-stimulated spermatogenesis, we have found that DHP up-regulates the expression of cysteine dioxygenase1 (CDO1) in the Japanese eel testis. CDO1 is one of the enzymes involved in the taurine biosynthesis pathway. To evaluate whether taurine is synthesized in the eel testis, cysteine sulfinate decarboxylase (CSD), another enzyme involved in taurine synthesis, was isolated from this species. RT-PCR and in vitro eel testicular culture revealed that although CSD was also expressed in eel testis, neither DHP nor other sex steroids affect CSD mRNA expression in a similar manner to CDO1. Using an in vitro eel testicular culture system, we further investigated the effects of DHP on taurine synthesis in the eel testis. HPLC analysis showed that DHP treatment significantly increases the taurine levels in the eel testis. These results suggest that DHP promotes taurine synthesis via the up-regulation of CDO1 mRNA expression during eel spermatogenesis. Furthermore, we observed from our analysis that although taurine does not induce complete spermatogenesis, it promotes spermatogonial DNA synthesis and the expression of Spo11, a meiosis-specific marker. These data thus suggest that taurine augments the effects of sex steroids in the promotion of spermatogonial proliferation and/or meiosis and hence that taurine plays important roles in spermatogenesis.
Starting Page	773
Ending Page	781
Page Count	9
File Format	PDF
ISSN	09394451
Journal	Amino Acids
Volume Number	43
Issue Number	2
e-ISSN	14382199
Language	English
Publisher	Springer Vienna
Publisher Date	2011-11-02
Publisher Place	Vienna
Access Restriction	Subscribed
Subject Keyword	Taurine Progestin Cysteine dioxygenase Spermatogenesis In vitro culture Analytical Chemistry Biochemical Engineering Neurobiology Biochemistry Proteomics Life Sciences
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Clinical Biochemistry

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