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- W933404306 abstract "Objective: To investigate the signal transduction mechanism of gap junctional genes connexin43 in human cervical carcinogenesis. Methods: Human cervical carcinoma cell line HeLa was cultured and treated by all-trans-retinoic acid (ATRA). Flow cytometer (FCM) was employed to detect expression of Cx43 protein in HeLa cells. Fluo-3 AM loading and laser scanning confocal microscope (LSCM) were used to measure the concentrations of intracellular calcium ([Ca2+]i) in HeLa cells. Phosphorylation on tyrosine of connexin43 protein was examined by immunoblot. Results: The positive rate of Cx43 protein increased from 1.9% in untreated HeLa cells to 26.3% in RA-treated HeLa cells as shown by FCM. [Ca2+]i was 35.73 nmol/L in untreated HeLa cells which was increased to 58.16 nmol/L in ATRA-treated cells.Immunoblot showed that ATRA-treated HeLa cells had phosphorylation on tyrosine in Cx43 protein whereas untreated cells had not. Conclusions: Carcinogenesis of human cervical carcinoma is related with the abnormal expression of cx43gene and disorder of signal transduction manifested as the decrease of [Ca2+]i and post-translation phosphorylation on tyrosine of Cx43 protein. The anti-tumor effect of ATRA in HeLa cells might be due to the up-regulation of cx43 gene and its signal transduction pathway." @default.
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- W933404306 date "2001-01-01" @default.
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- W933404306 title "Effects of all-trans-retinoic acid on the expression and tyrosine phosphorylation of gap junction connexin 43 in HeLa cell line and its significance" @default.
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