Background: Toll-like receptors (TLRs) are expressed by human epidermal keratinocytes and are involved in immune responses.
Objective: The goal of this was to investigate the expression of TLR2 in response to bacterial antigens, cytokines, and different calcium concentrations.
Methods: The expression of TLR2 was assessed after stimulation by lipoteichoic acid (LTA) and streptolysin O (SLO). In addition, TLR2 expression was evaluated after treatment with IFN-gamma and TNF-alpha, and different concentrations of calcium. The expression levels of TLR2 mRNA and protein were studied using RT-PCR and Western blot analysis.
Results: Cultured human epidermal keratinocytes constitutively expressed TLR2 and the expression was stimulated by LTA and SLO; in addition, IFN-gamma and TNF-alpha upregulated TLR2 expression. However, the changes in TLR2 expression associated with the calcium concentrations were insignificant.
Conclusion: TLR2 expression increased with the concentration and duration of bacterial pathogens and this increase was amplified by several cytokines, from activated keratinocytes and other cells.
Keywords: Calcium; Cytokine; Keratinocyte; Microbacterial antigen; Toll-like receptor 2.