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Cyclosporine-A induces endoplasmic reticulum stress and influences pro-apoptotic factors in human gingival fibroblasts.
Molecular and Cellular Biochemistry 2017 May
Cyclosporine-A (CsA) induces gingival overgrowth. Cyclosporine's anti-apoptotic activity in human gingival fibroblast is due to desensitization of mitochondrial permeability transition pore (MPTP) and augmentation of anti-apoptotic, Bcl2. Alternative mechanisms of apoptosis exist involving enzymes like calcium-dependent Calpain and signaling events related to apoptosis, like Glycogen synthase kinase 3β (GSK3β) and protein kinase A (PKA). Cyclosporine-A in renal tubular cells induces endoplasmic reticulum stress (ER stress) which has not been explored in gingival overgrowth. Hence, this study was carried out to assess the influence of Cyclosporine-on ER stress and on the alternate anti-apoptotic mechanisms. Human gingival fibroblasts were treated with CsA, and expression of ER stress markers, such as binding immunoglobulin protein and CCAAT/enhancer-binding protein homologous protein (CHOP), MPTP, and expression of Calpain & GSK3β /PKA were estimated. The results showed CsA-added fibroblast significantly increasing the expression of Endoplasmic reticulum stress markers. Contrary to usual ER stress outcome of apoptosis, we observed Cyclosporine's anti-apoptotic action in spite of augmented ER stress markers. We conclude that CsA's independent action on different organelles may alter the conventional outcome of ER stress.
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