2-Acetylaminofluorene suppresses immune response through the inhibition of nuclear factor-κB activation during the early stage of B cell development
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- 2-Acetylaminofluorene suppresses immune response through the inhibition of nuclear factor-κB activation during the early stage of B cell development
- Michael Lee; Kyu-Hwan Yang
- Bibliographic Citation
- Toxicology Letters, vol. 114, no. 1, pp. 173-180
- Publication Year
- 2-Acetylaminofluorene (AAF), an arylamide carcinogen, has been known to inhibit humoral and cell-mediated immune response by lipopolysaccharide (LPS). In the current study we demonstrate that AAF induced the down-regulation of protein kinase C (PKC) that is a key enzyme in the pathways leading to LPS-induced B-cell proliferation, while having no inhibitory effect on intracellular cAMP in spleen cells. Additionally, to identify the mechanism of action of AAF during B-cell development, we determined the effects of AAF on LPS-induced nuclear factor-κB (NF-κB) activation in 70Z/3 murine pre-B cells, CH12 murine mature B cells and S194 murine plasmacytoma cells. LPS-induced NF-κB activation, which is dependent on PKC, was inhibited by pretreatment with AAF for 2 h in the nuclei of 70Z/3 murine pre-B cells by detection of NF-κB specific DNA-protein binding. Conversely, AAF barely inhibited the constitutive NF-κB binding activity in mature B-cells, S194 and CH12. To confirm the effect of AAF on NF-κB activation, a chloramphenicol acetyl transferase (CAT) expression vector containing multiple copies of the NF-κB element (pCAT(κB)3) was transiently transfected into 70Z/3 or S194 cells, and assessed for inducible CAT activity. AAF treatment of 70Z/3 cells resulted in a significant inhibition of CAT activity induced by LPS. However, AAF exhibited no inhibitory effect on constitutive CAT activity in mature B cells, S194, indicating that AAF no longer has suppressive effects on the immune response in differentiated B cells. Taken together, these results suggest that AAF may act to suppress immune response by blocking the activation of PKC and nuclear expression of NF-κB at the early stage of B cell development.
- 2-acetylaminofluorene; protein kinase C; NF-κB; immunosuppression
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- 1. Journal Articles > Journal Articles
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