Cadmium exposure alters metabolomics of sulfur-containing amino acids in rat testes

Yasoo Sugiura, Misato Kashiba, Kayo Maruyama, Koichi Hoshikawa, Ryoko Sasaki, Kazuyoshi Saito, Hideo Kimura, Nobuhito Goda, Makoto Suematsu*


研究成果: Article査読

30 被引用数 (Scopus)


This study aimed to examine distribution of cystathionine β-synthase (CBS) and cystathionine γ-lyase (CSE), the hydrogen sulfide (H 2S)-generating enzymes, and metabolomic alterations in sulfur-containing amino acids in rat testes exposed to stressors. Immunohistochemistry revealed distinct distribution of the two enzymes: CBS occurred mainly in Leydig cells and was also detectable in Sertoli cells and germ cells, whereas CSE was evident in Sertoli cells and immature germ cells involving spermatogonia. The amounts of CSE and CBS in testes did not alter in response to administration of cadmium chloride, an antispermatogenic stressor leading to apoptosis. Metabolome analyses assisted by liquid chromatography equipped with mass spectrometry revealed marked alterations in sulfur-containing amino acid metabolism: amounts of methionine and cysteine were significantly elevated concurrently with a decrease in the ratio between S- adenosylhomocysteine and S-adenosylmethionine, suggesting expansion of the remethylation cycle and acceleration of methyl donation. Despite a marked increase in cysteine, amounts of H2S were unchanged, leading to a remarkable decline of the H2S/cysteine ratio in the cadmium-treated rats. Under such circumstances, oxidized glutathione (GSSG) was significantly reduced, whereas reduced glutathione (GSH) was well maintained, and the GSH/GSSG ratio was consequently elevated. These results collectively showed that cadmium induces metabolomic remodeling of sulfur-containing amino acids even when the protein expression of CBS or CSE is not evident. Although detailed mechanisms for such a remodeling event remain unknown, our study suggests that metabolomic analyses serve as a powerful tool to pinpoint a critical enzymatic reaction that regulates metabolic systems as a whole.

ジャーナルAntioxidants and Redox Signaling
出版ステータスPublished - 2005 5

ASJC Scopus subject areas

  • 生化学
  • 生理学
  • 分子生物学
  • 臨床生化学
  • 細胞生物学


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