Carcinogenesis Advance Access published online on April 8, 2004
Carcinogenesis, doi:10.1093/carcin/bgh142
© 2004 by Oxford University Press
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CANCER BIOLOGY
1 Institute of General Pathology, Catholic University, Rome, Italy
* Corresponding author. E-mail: p.palozza{at}rm.unicatt.it.
Received 15 October 2003
; revised 3 March 2004
; accepted 7 March 2004
Human intervention trials have shown that supplemental
-carotene exacerbates DNA oxidative damage and modifies p53-related pathways of cell proliferation and apoptosis in cultured cells exposed to tobacco smoke condensate
2 Centro di Ricerche Oncologiche Giovanni XXIII
3 Institute of Pathology, Catholic University, Rome, Italy
4 Institute of Histology, Catholic University, Rome, Italy
-carotene increases cancer risk in smokers, but the mechanism(s) underlying this effect is still unknown. The aim of this study was to evaluate the effects of an association of cigarette smoke condensate (TAR) and -carotene on DNA oxidative damage and molecular pathways involved in cell cycle progression and apoptosis in cultured cells. In RAT-1 fibroblasts, TAR caused increased levels of 8-OHdG and this effect was enhanced by the concomitant presence of -carotene (0.5-4.0 µM) in a dose- and time-dependent manner. In contrast, -carotene alone did not significantly modify it. Fibroblasts treated with TAR alone decreased their cell growth with respect to control cells through an arrest of cell cycle progression in the G0/G1 phase and an induction of apoptosis. These effects were accompanied by an increased expression of p53, p21 and Bax and by a decreased expression of cyclin D1. In contrast, fibroblasts treated with TAR and -carotene, after an initial arrest of cell growth at 12 h, re-entered in cell cycle and were unable to undergo apoptosis at 36 h. Concomitantly, their p53 expression, after an initial increase at 12 h, progressively returned at basal levels at 36 h by a mechanism independent of Mdm2. Such a decrease was followed by a decrease in p21 and Bax expression and by an increase in cyclin D1 expression. Moreover, the presence of the carotenoid remarkable enhanced COX-2 expression induced by TAR. During TAR treatment, a strong depletion of -carotene was observed in fibroblasts. The effects of TAR and -carotene on 8-OHdG levels, cell growth and apoptosis were also observed in Mv1Lu lung, MCF-7 mammary, Hep-2 larynx and LS-174 colon cancer cells. This study supports the evidence for a potential detrimental effect of an association between -carotene and cigarette smoke.
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