AIM: To explore molecular mechanism of nicotinamide adenine dinucleotide (NADH) antagonization against X-ray induced L02 cells damage.METHODS: L02 liver cells were cultured in RPMI 1640,exposed to X-ray irradiation and continued to culture in the presence or absence of NADH. Cellular viability was analyzed by routine MTT methods. The percent age of apoptotic cells and positive expressions of p53, bax and bcl-2, fas, fasL proteins were determined by FCM. Level of intracellular ROS was determined by confocal microscope scanning. Morphological change was detected by scanning electron micrograph.RESULTS: The viability of L02 cells was decreased with increasing dose of X-ray irradiation. NADH could not only eliminate the apoptosis induced by X-ray irradiation, but also up-regulate expression of bcl-2 protein and down-regulate expression of p53, bax, fas and fasL proteins (P＜0.05). At the same time, NADH could reduce level of intracellular ROS in radiated L02 cells.CONCLUSION: NADH has marked anti-radiation effect, its mechanism may be associated with up-regulation of bcl-2expression and down-regulation of p53, bax fas and fasL expression, as well as decline of intracellular ROS. However,further investigation of its mechanism is worthwhile.
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