Abstract
Apoptosis of endothelial cells may be an important risk factor contributing to the incidence of vascular complications in diabetes. In the present study, we tested the effect of 3,4,5,6-tetrahydroxyxanthone, a synthetic xanthone derivative, on apoptosis induced in human umbilical vein endothelial cells (HUVEC) by a high glucose concentration. Cell apoptosis was detected using DNA ladder formation and flow cytometric techniques. The expression of Bcl-2 protein was analysed using flow cytometric techniques. Lactate dehydrogenase (LDH) activity and malonyldialdehyde (MDA) content in the medium were measured. Cell viability was assayed by the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) method. Exposure of HUVEC to a high glucose concentration (30 mM) for 48 h markedly increased LDH release and MDA content in the medium and induced apoptosis and Bcl-2 protein expression in HUVEC. Pretreatment with 3,4,5,6-tetrahydroxyxanthone (1, 3 or 10 μM) or probucol (10 μM) significantly decreased the level of LDH and MDA in the medium, reduced apoptosis and increased the expression of Bcl-2 protein in HUVEC. These results suggest that 3,4,5,6-tetrahydroxyxanthone inhibits high-glucose-induced endothelial cell apoptosis by increasing Bcl-2 protein expression in HUVEC.
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This study was supported by a grant from the Provincial Natural Science Foundation of Hunan, China, No. 02jjy2046.
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Dai, Z., Liao, DF., Jiang, DJ. et al. 3,4,5,6-Tetrahydroxyxanthone prevents vascular endothelial cell apoptosis induced by high glucose. Naunyn-Schmiedeberg's Arch Pharmacol 370, 314–319 (2004). https://doi.org/10.1007/s00210-004-0973-y
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DOI: https://doi.org/10.1007/s00210-004-0973-y