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Stimulation of a cultured human salivary gland (HSG) cell line by interferon (IFN)-gamma leads to HLA-DR gene expression concomitant with inflammatory cytokine genes such as IL-1 beta, tumor necrosis factor (TNF)-alpha, and IL-6 in vitro. IFN-gamma-induced HLA-DR mRNA expression was clearly detected at 2 h after the stimulation, and thereafter its level of gene expression increased until day 7 on HSG cells by reverse transcriptase (RT)-PCR. Immunofluorescence analysis revealed that cytoplasmic HLA-DR immunoreactivity was detected for the first time at 2 days after the stimulation, and its immunoreactivity increased gradually until day 7, while no immunoreactivity with HLA-DP and HLA-DQ was observed at any of the days. In addition, the expression of IL-1 beta, TNF-alpha, and IL-6 on the IFN-gamma-stimulated HSG cells was detected by immunohistochemistry and RT-PCR analysis. These results indicate that human salivary gland cells can be induced to express HLA-DR mRNA by IFN-gamma concomitant with inflammatory cytokine gene expressions such as IL-1 beta, TNF-alpha, and IL-6.
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