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Screening of Anti-cancer Compounds Originated from Filamentous Fungi (Monascus sp.)  

Sin, Yeong-Min (Test & Analytical Lab., Busan Regional Food & Drug Administration)
Park, Hae-Ryoun (Department of Oral Pathology, College of Dentistry, Pusan National University)
An, Won-Gun (Department of Oral Pathology, College of Dentistry, Pusan National University)
Publication Information
Journal of Physiology & Pathology in Korean Medicine / v.19, no.3, 2005 , pp. 671-676 More about this Journal
Abstract
In this study, we investigated the antioxidant effect of extract from Monascus pillosus, on the human wild-type p53 and p21 expressing A549 lung epithelial cell line and MCF-7 mammary adenocarcinoma cell line stimulated by NO. $P21^{waf/cip1}$ was identified as a gene induced in senescent cells. It is a cyclin-dependent kinase inhibitor and has been shown to cause cell cycle arrest and apoptosis. While p53-regulated stimulation of p21 appears to be central for the permanent growth-arrest, the role of p21 in p53-triggered cell death is unclear. Low dose of sodium nitroprusside (SNP) induced the development of senescence associated with increased expression of p53 and p21 in A549 cells. Inhibition of p21 transactivating activity requires high level correlates with the amount of p53 necessary to cause cell death. Association of p21 and p53 results in inhibition of p21-stimulated transcription. This requires a higher p53 level than is necessary for transcriptional activation of endogenous p53-responsive gene but correlates well with the level of p53 necessary to cause cell death. Exposure to W-1 inhibited oxidative stresses-induced senescence-like arrest, resulting in a significant reduction in p53 and p21 steady state levels. These results suggest that p53 and p21 play a central role in the onset of senescence. Thus, it is important to emphasize control of oxidative balance in tumor prevention and aging.
Keywords
Monascus sp.; antioxidant effect; apoptosis; p53; p21;
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