Aberrant NF-κB activity in HaCaT cells alters their response to UVB signaling

Davina A. Lewis, Simone F. Hengeltraub, Feng C. Gao, Megan A. Leivant, Dan Spandau

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The immortalized keratinocyte cell line called HaCaT has been used in experiments as a convenient substitute for cultured normal human keratinocytes. However, some molecular differences have been identified that distinguish HaCaT cells from normal human keratinocytes, including differences in the NF-κB signaling pathway and in their response to UVB irradiation. NF-κB is a widely expressed transcription factor that is activated by a cacophony of stimuli, including inflammatory mediators such as TNFα and oxidative stressors such as UVB exposure. This report delineates and further elucidates the aberrant NF-κB signaling pathway and its effect in HaCaT cells exposed to UVB radiation or inflammatory mediators. We demonstrate that NF-κB DNA binding is activated by both UVB and TNFα, but discrepancies in the activation of key upstream signaling pathway components such as AKT phosphorylation and IκBα degradation exist. Disruption of the constitutive NF-κB activity in HaCaT cells resulted in alterations in NF-κB signaling that were more consistent with the NF-κB signaling pathway in normal human keratinocytes. These studies suggest that caution should be used in extrapolating the biological responses of HaCaT cells to those of normal human keratinocytes in the absence of confirmatory experiments.

Original languageEnglish
Pages (from-to)1885-1892
Number of pages8
JournalJournal of Investigative Dermatology
Volume126
Issue number8
DOIs
StatePublished - Aug 2006

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Keratinocytes
Phosphorylation
Transcription Factors
Experiments
Chemical activation
Cells
Irradiation
Radiation
Cell Line
Degradation
DNA

ASJC Scopus subject areas

  • Dermatology

Cite this

Aberrant NF-κB activity in HaCaT cells alters their response to UVB signaling. / Lewis, Davina A.; Hengeltraub, Simone F.; Gao, Feng C.; Leivant, Megan A.; Spandau, Dan.

In: Journal of Investigative Dermatology, Vol. 126, No. 8, 08.2006, p. 1885-1892.

Research output: Contribution to journalArticle

Lewis, Davina A. ; Hengeltraub, Simone F. ; Gao, Feng C. ; Leivant, Megan A. ; Spandau, Dan. / Aberrant NF-κB activity in HaCaT cells alters their response to UVB signaling. In: Journal of Investigative Dermatology. 2006 ; Vol. 126, No. 8. pp. 1885-1892.
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