Chen J, Yu HW, Zhang ZM. Effect of store-operated Ca
2+ channels on proliferative activity of hepatoma cells.
Shijie Huaren Xiaohua Zazhi 2013;
21:1745-1749. [DOI:
10.11569/wcjd.v21.i18.1745]
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Abstract
AIM: To investigate the changes in the function of store-operated Ca2+ channels (SOCs) between human hepatoma cells and human liver cells and to dicuss the effect of SOCs on the proliferative ability of hepatoma cells.
METHODS: Cultured human hepatoma cells (SMMC7721) and human liver cells (HL7702) were used in this study. Membrant current of SOCs was detected using the patch-clamp technique. Intracellular free Ca2+ concentration was determined using laser scanning confocal microscopy. Cell proliferation was assessed by MTT assay, and cell cycle progression was detected by flow cytometry.
RESULTS: The SOC current density was significantly higher in human hepatoma cells than in human liver cells (19.36 pA/pF ± 4.99 pA/pF vs 8.90 pA/pF ± 2.78 pA/pF, P < 0.05). The increase in intracellular calcium fluorescence intensity was also significantly higher in human hepatoma cells than in human liver cells (31.81% ± 8.89% vs 21.58% ± 6.01%, P < 0.05). MTT growth curve showed that the proliferative ability of human hepatoma cells was significantly higher than that of human liver cells from the third day, and the difference was increasing with the prolongation of time. Flow cytometry analysis indicated that S-phase fraction (SPF) and proliferation index (PI) were significantly greater in human hepatoma cells than in human liver cells, suggesting that the proliferative ability of hepatoma cells is much high than that of human liver cells.
CONCLUSION: Compared to human liver cells, human hepatoma cells have significantly increased SOC current density, intracellular free Ca2+ concentration, and proliferative ability, indicating that the enhancement of proliferative ability of human hepatoma cells may be related to the enhancement of SOC function.
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