Nrf2-dependent protection from LPS induced inflammatory response and mortality by CDDO-Imidazolide

Rajesh K. Thimmulappa, Catherine Scollick, Kassim Traore, Melinda Yates, Michael A. Trush, Karen T. Liby, Michael B. Sporn, Masayuki Yamamoto, Thomas W. Kensler, Shyam Biswal

研究成果: Article査読

247 被引用数 (Scopus)

抄録

Sepsis induced lethality is characterized by amplified host innate immune response. Nrf2, a bZIP transcription factor, regulates a battery of cellular antioxidative genes and maintains cellular redox homeostasis. This study demonstrates that increasing Nrf2 activity by a potent small molecule activator, CDDO-Im (1-[2-cyano-3-,12-dioxooleana-1,9(11)-dien-28-oyl]imidazole), protects from deregulation of lipopolysaccharide (LPS) induced innate immune response. In response to LPS stimuli, nrf2-deficient (nrf2 -/-) peritoneal neutrophils showed increased NADPH oxidase-dependent ROS generation, proinflammatory cytokines (Tnf-α and Il-6) and chemokines (Mip2 and Mcp-1) relative to wild-type (nrf2 +/+) cells. Pretreatment of peritoneal neutrophils with CDDO-Im induced antioxidative genes (Ho-1, Gclc, Gclm, and Nqo1) and attenuated LPS induced ROS generation as well as expression of proinflammatory cytokines exclusively in nrf2 +/+ neutrophils but not in nrf2 -/- cells. In corroboration with in vitro studies, pretreatment with CDDO-Im induced Nrf2-dependent antioxidative genes, attenuated LPS induced proinflammatory cytokine expression, and decreased mortality specifically in the nrf2 +/+ mice. In conclusion, the results suggest that Nrf2 is associated with oxidative regulation of LPS induced innate immune response in neutrophils. Activation of Nrf2-dependent compensatory antioxidative pathways by CDDO-Im protects from LPS induced inflammatory response and mortality.

本文言語English
ページ(範囲)883-889
ページ数7
ジャーナルBiochemical and biophysical research communications
351
4
DOI
出版ステータスPublished - 2006 12 29
外部発表はい

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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