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Related Experiment Videos

Reactive oxygen species augment B-cell-activating factor expression.

Eun-Yi Moon1, Jun-Hee Lee, Su-Young Oh

  • 1Laboratory of Human Genomics, Korea Research Institute of Bioscience and Biotechnology, KRIBB, Taejeon 305-806, Korea. eunyi@kribb.re.kr

Free Radical Biology & Medicine
|June 21, 2006
PubMed
Summary

Reactive oxygen species (ROS) increase B-cell-activating factor (BAFF) production via toll-like receptor 4 (TLR4) signaling. Antioxidant enzymes like peroxiredoxin II (PrxII) control ROS, thereby regulating BAFF levels and B-cell populations.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • B-cell-activating factor (BAFF) is crucial for mature B-cell development and survival.
  • Lipopolysaccharide (LPS) triggers toll-like receptor 4 (TLR4) signaling, leading to reactive oxygen species (ROS) production.

Purpose of the Study:

  • To investigate the regulation of BAFF production by ROS.
  • To explore the role of antioxidant enzymes in controlling ROS-mediated BAFF expression.

Main Methods:

  • Investigated BAFF expression in vitro using LPS stimulation and serum deprivation.
  • Utilized antioxidants such as N-acetyl-L-cysteine (NAC) to assess ROS inhibition.
  • Examined BAFF expression in vivo in peroxiredoxin II (PrxII)-deficient mice.
  • Analyzed NF-kappaB pathway activation through IkappaBalpha degradation and p65/RelA translocation.

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Main Results:

  • LPS stimulation and serum deprivation, which induce ROS, augmented BAFF expression.
  • Antioxidants (NAC) inhibited LPS-induced BAFF expression.
  • PrxII-deficient mice exhibited higher serum BAFF levels and splenocyte BAFF transcript expression.
  • Increased BAFF levels in PrxII(-/-) mice correlated with higher splenocyte counts and B220(+) cells.
  • NF-kappaB activation was modulated by ROS levels, LPS, serum deprivation, and PrxII deficiency.

Conclusions:

  • ROS positively regulate TLR4-mediated BAFF expression.
  • PrxII, by controlling ROS, plays an inhibitory role in BAFF production.
  • These findings elucidate a novel regulatory mechanism for BAFF involving oxidative stress and antioxidant defense.