The aim of this study was to verify the hypothesis that beta-carotene may prevent 7-ketocholesterol (7-KC)-induced apoptosis in human macrophages. Therefore, THP-1 macrophages were exposed to 7-KC (5-50 microM) alone and in combination with beta-carotene (0.25-1 microM). 7-KC inhibited the growth of macrophages in a dose- and a time-dependent manner by inducing an arrest of cell cycle progression in the G0/G1 phase and apoptosis. Concomitantly, p53, p21, and Bax expressions were increased by 7-KC, whereas the levels of AKT, Bcl-2, and Bcl-xL were decreased. beta-Carotene prevented the growth-inhibitory effects of 7-KC in a dose- and time-dependent manner as well as the effects of 7-KC on the expression of cell cycle- and apoptosis-related proteins. 7-KC also enhanced reactive oxygen species (ROS) production through an increased expression of NAD(P)H oxidase (NOX-4). The effects of 7-KC were counteracted by the addition of the NAD(P)H oxidase inhibitor DPI or by cotransfection of siNOX-4 mRNA. beta-Carotene prevented 7-KC-induced increase in ROS production and in NOX-4 expression, as well as the phosphorylation of p38, JNK, and ERK1/2 induced by 7-KC. These data suggest a possible antiatherogenic role of beta-carotene through the prevention of 7-KC toxicity in human macrophages

Palozza, P., Serini, S., Verdecchia, S., Ameruso, M., Trombino, S., Picci, N., Monego, G., Ranelletti, F. O., Redox regulation of 7-ketocholesterol-induced apoptosis by beta-carotene in human macrophages, <<FREE RADICAL BIOLOGY & MEDICINE>>, 2007; (42): 1579-1590 [http://hdl.handle.net/10807/5547]

Redox regulation of 7-ketocholesterol-induced apoptosis by beta-carotene in human macrophages

Palozza, Paola;Serini, Simona;Verdecchia, Sara;Monego, Giovanni;Ranelletti, Franco Oreste
2007

Abstract

The aim of this study was to verify the hypothesis that beta-carotene may prevent 7-ketocholesterol (7-KC)-induced apoptosis in human macrophages. Therefore, THP-1 macrophages were exposed to 7-KC (5-50 microM) alone and in combination with beta-carotene (0.25-1 microM). 7-KC inhibited the growth of macrophages in a dose- and a time-dependent manner by inducing an arrest of cell cycle progression in the G0/G1 phase and apoptosis. Concomitantly, p53, p21, and Bax expressions were increased by 7-KC, whereas the levels of AKT, Bcl-2, and Bcl-xL were decreased. beta-Carotene prevented the growth-inhibitory effects of 7-KC in a dose- and time-dependent manner as well as the effects of 7-KC on the expression of cell cycle- and apoptosis-related proteins. 7-KC also enhanced reactive oxygen species (ROS) production through an increased expression of NAD(P)H oxidase (NOX-4). The effects of 7-KC were counteracted by the addition of the NAD(P)H oxidase inhibitor DPI or by cotransfection of siNOX-4 mRNA. beta-Carotene prevented 7-KC-induced increase in ROS production and in NOX-4 expression, as well as the phosphorylation of p38, JNK, and ERK1/2 induced by 7-KC. These data suggest a possible antiatherogenic role of beta-carotene through the prevention of 7-KC toxicity in human macrophages
Inglese
Palozza, P., Serini, S., Verdecchia, S., Ameruso, M., Trombino, S., Picci, N., Monego, G., Ranelletti, F. O., Redox regulation of 7-ketocholesterol-induced apoptosis by beta-carotene in human macrophages, <<FREE RADICAL BIOLOGY & MEDICINE>>, 2007; (42): 1579-1590 [http://hdl.handle.net/10807/5547]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/5547
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