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Archives of Toxicology

, Volume 85, Issue 5, pp 499–504 | Cite as

Acrolein, an I-κBα-independent downregulator of NF-κB activity, causes the decrease in nitric oxide production in human malignant keratinocytes

  • Ki-Young MoonEmail author
Molecular Toxicology

Abstract

Acrolein, a reactive electrophilic α, β-unsaturated aldehyde, is known to be an alkylating chemical carcinogen. The effect of acrolein on the activation of NF-κB in human malignant epidermal keratinocytes was examined to elucidate the molecular mechanism associated with this NF-κB-acrolein regulation and its consecutive sequence, nitric oxide (NO) production. Acrolein significantly downregulated the cellular NF-κB activity up to 60% compared with control as well as the lipopolysaccharide (LPS)-induced NO production in a dose response manner at concentrations of 10~30 μM. To investigate the regulatory mechanism associated with this NF-κB-acrolein downregulation, the relative level of phosphorylation of I-κBα (serines-32 and -36), a principle regulator of NF-κB activation, represented by acrolein, was quantified. Acrolein inhibited NF-κB activity without altering cellular levels of the phosphorylated and nonphosphorylated forms of I-κBα, implying that the downregulatory effect of acrolein on cellular NF-κB activity in human skin cells is an I-κBα-independent activation pathway. The results suggests that acrolein causes the decrease in nitric oxide production as an I-κBα-independent downregulator of NF-κB activity in human malignant keratinocytes, and acrolein-induced carcinogenesis may be associated with the modulation of cellular NF-κB activity.

Keywords

Acrolein NF-κB activity I-κB Nitric oxide Chemical carcinogenesis Human malignant keratinocytes 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Clinical PathologyGwangju Health College UniversityGwangjuKorea

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