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PMID |
Sentence |
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24478392
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Synergistic effect of interferon-gamma and tumor necrosis factor-alpha on coxsackievirus and adenovirus receptor expression: an explanation of cell sloughing during testicular inflammation in mice.
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24478392
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Interferon-gamma (IFNG) and tumor necrosis factor alpha (TNF) are two major cytokines that are elevated during testicular inflammation and cause reduced fertility.
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24478392
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We investigated the mechanism by which IFNG and TNF exert their disruptive effects on testicular cell adhesion.
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24478392
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We have demonstrated that combined treatment with IFNG and TNF (IFNG+TNF) exerts a synergistic effect by downregulating CAR mRNA and protein levels.
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24478392
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Immunofluorescence staining revealed that IFNG+TNF treatment effectively removes CAR from the site of cell-cell contact.
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24478392
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Using inhibitor and co-immunoprecipitation, we confirmed that IFNG+TNF mediates CAR protein degradation via ubiquitin-proteasome and NFKB pathways.
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24478392
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Blockage of ubiquitin-proteasome pathway significantly inhibits CAR degradation, as indicated by the reappearance of CAR at the site of cell-cell contact.
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24478392
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Additionally, IFNG+TNF reduces CAR mRNA via transcriptional regulation.
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24478392
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Mutational studies have shown that IFNG+TNF-induced CAR repression is achieved by suppression of the basal transcription.
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24478392
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Electrophoretic mobility shift assay and chromatin immunoprecipitation assays further confirmed that IFNG+TNF treament not only inhibits binding of the basal transcription factors but also promotes binding of NFKB subunits and Sp1 (negative regulators) to the CAR promoter region.
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24478392
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Taken together, IFNG+TNF treatment significantly downregulates CAR expression, which provides an explanation of how cell sloughing in the epithelium mediates, by loss of CAR-based cell adhesion, during testicular inflammation.
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