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Title: Differential regulation of surface receptor expression, proliferation, and apoptosis in HaCaT cells stimulated with interferon-y, interleukin-4, tumor necrosis factor-alpha, or muramyl dipeptide
Authors: Darazi, Emale El
Bazzi, Samer 
Daoud, Sarah
Echtay, Karim 
Bahr, George M. 
Affiliations: Department of Biology 
Faculty of Medicine 
Faculty of Medicine 
Keywords: Apoptosis
CD molecules
Muramyl dipeptide
Surface receptors
Subjects: Keratinocytes
Issue Date: 2017
Part of: International journal of immunopathology and pharmacology
Volume: 30
Issue: 2
Start page: 130
End page: 145
Keratinocytes are routinely subjected to both internal and external stimulation. This study investigates the effects of interferon gamma, interleukin-4, tumor necrosis factor alpha, and the synthetic immunomodulator muramyl dipeptide on the human keratinocyte cell line, HaCaT. Following HaCaT stimulation with cytokines or muramyl dipeptide for different time periods, changes in the expression of different cell surface receptors, cell proliferation, and cell apoptosis were evaluated by flow cytometry, tritiated thymidine uptake, and annexin-V staining, respectively. A significant decrease in the expression of CD49d was found upon treatment with interleukin-4. Interferon gamma and tumor necrosis factor alpha increased the expression of intercellular adhesion molecule 1 and major histocompatibility complex class I, whereas major histocompatibility complex class II and CD1b were only upregulated by interferon gamma. Interferon gamma and tumor necrosis factor alpha had opposite effects regarding CD119 expression, with the former downregulating, while the latter upregulating its expression. Of the stimuli tested, only interferon gamma and tumor necrosis factor alpha significantly inhibited proliferation of HaCaT cells, yet only interferon gamma played a significant role in inducing HaCaT cell apoptosis. Our data demonstrate differential effects of the three tested cytokines on keratinocytes and reveal that the absence of HaCaT cell responses to muramyl dipeptide is associated with undetectable levels of its cytoplasmic receptor, nucleotide-binding oligomerization domain–containing protein 2.
DOI: 10.1177/0394632017707611
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Biology

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