Acute stress response in calorie-restricted rats to lipopolysaccharide- induced inflammation

Tomoshi Tsuchiya, Yoshikazu Higami, Toshimitsu Komatsu, Kenji Tanaka, Sumihisa Honda, Haruyoshi Yamaza, Takuya Chiba, Hiroyoshi Ayabe, Isao Shimokawa*

*この研究の対応する著者

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Calorie restriction (CR) reduces morbidity and mortality in a wide range of organisms, possibly through the stress response machinery. We analyzed the acute phase response of CR rats to lipopolysaccharide (LPS)-induced inflammatory challenge. Six-month-old male F344 rats, fed ad libitum (AL) or a 30% calorie-restricted diet from 6 weeks of age, received an intravenous LPS injection and were then sacrificed between 0 and 8 h. CR attenuated liver injury without reduction in the plasma concentrations of proinflammatory cytokines or nitric oxide (NO). Western blotting analysis of liver tissue demonstrated that CR did not affect the degradation of cytoplasmic I-κB and subsequent nuclear translocation of NF-κB, a key transcription factor after inflammatory challenge. We also analyzed the liver gene expression profiles at 0, 1 and 4 h with DNA arrays and cluster analysis. Compared with the AL group, CR upregulated the expression of several genes for inflammatory mediators or their related molecules at 0 h, but not at 1 or 4 h. CR downregulated genes for energy or xenobiotic metabolism and stress response proteins at 0 h. At 1 h, the relatively downregulated genes by CR were those for proteases and the ubiquitin-proteasome pathway. The present results suggest that CR attenuates liver injury without suppression of the proinflammatory response, and that the protective effect emerges from constitutively, rather than inductively, expressed gene products.

本文言語English
ページ(範囲)568-579
ページ数12
ジャーナルMechanisms of Ageing and Development
126
5
DOI
出版ステータスPublished - 2005 5
外部発表はい

ASJC Scopus subject areas

  • 加齢科学
  • 発生生物学

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