Pre-administration of L-tryptophan improved ADR-induced early renal failure in mice

Yuko Arioka, Yasuko Yamamoto, Masato Hoshi, Keishi Matsumoto, Manabu Takamatsu, Akira Hara, Mitsuru Seishima, Kuniaki Saito

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Aims: The aim of this study was to determine the localization of the rate-limiting enzyme indoleamine 2, 3-dioxygenase (IDO) and its metabolite in mice kidneys after adriamycin (ADR)-induced renal failure. We also examined the effect of l-tryptophan (Trp) administration on this model. Main methods: BALB/c mice were treated with 15 mg/kg ADR to induce renal failure. The change of IDO and l-kynurenine (Kyn) following ADR-induced renal failure was examined by immunostaining combined with hematoxylin and eosin (HE) and Periodic acid-Schiff (PAS) staining for morphological analysis, and the concentration of l-Kyn was measured by HPLC. The effect of l-Trp administration on ADR-induced renal failure was also investigated. Key findings: Time-dependent increase of IDO immunostaining was observed in tubular cells from Day 4 after ADR injection. It was found that mice fed with l-Trp had less chance of renal failure at four days after ADR injection than mice untreated with l-Trp, but not at seven days. Further, l-Trp treatment significantly suppressed an increased level of TNF-alpha mRNA, but not of TGF-beta and IL1-beta after renal injury. Significance: Local IDO expression in tubules was induced markedly after ADR- induced renal failure. l-Trp administration can be effective in suppressing ADR-induced renal failure at an early stage.

Original languageEnglish
Pages (from-to)100-106
Number of pages7
JournalLife Sciences
Issue number3-4
Publication statusPublished - 21-08-2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)


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