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• W2077025410 abstract "To investigate the role of Ca2+ in lipofuscin formation in human retinal pigment epithelial (RPE) cells that phagocytize bovine photoreceptor outer segments (POSs). Cultured human RPE cells fed with 2 × 107 per l bovine POS were treated with flunarizine, an antagonist of Ca2+ channel, or/and centrophenoxine, a lipofuscin scavenger. The Ca2+ changes and lipofuscin formation were measured with fluoresence dye Fluo-3/AM ester, laser scanning confocal microscopy (LSCM) and flow cytometry (FCM). The activity of RPE cells was measured by methyl thiazolyl tetrazolium (MTT) assay and argyrophilic nucleolar organizer regions (AgNORs) assay. The Ca2+ fluorescence intensity (CFI) of RPE cells fed with POS was significantly increased compared with the controls (165.36±29.92 U). It reached a peak with 777.33±63.86 U (P<0.01) at 12 h, and then decreased but still maintained a high level of 316.90±36.07 U (P<0.01) for 4 days. Flunarizine and centrophenoxine significantly decreased the Ca2+ overload to 227.18±14.00 U at 12 h and 211.06±20.45 U at 4 days. FCM confirmed these changes. The drugs also showed an inhibitory effect on the lipofuscin formation. The proliferation rate of the cells fed with POS increased significantly. Both drugs had inhibitory effects on the activity of the cultured cells. This tendency was confirmed by AgNORs assay. The Ca2+ inflow initiated lipofuscin accumulation in RPE cells fed with POS. Flunarizine and centrophenoxine can decrease Ca2+ overload and lipofuscin formation in RPE cells, accompanied by maintaining cellular vitality." @default.
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• W2077025410 date "2011-02-11" @default.
• W2077025410 modified "2023-10-18" @default.
• W2077025410 title "Calcium overload is associated with lipofuscin formation in human retinal pigment epithelial cells fed with photoreceptor outer segments" @default.
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• W2077025410 doi "https://doi.org/10.1038/eye.2011.7" @default.
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