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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2010.1
- 수록면
- 942 - 949 (8page)
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Morus alba L., a kind of Oriental medicinal herbs, has been traditionally used to treat pulmonary asthma and congestion. According to recent studies, extracts of M. alba L. have showed anti-inflammatory, anti-oxidant, anti-tumor and hypoglycemic effects. However, the molecular mechanisms on how it acts as a death-inducer in cancer cells have not been fully understood. In this study, we investigated the cell death effects of methylene chloride extracts of M. alba L. (MEMA) in A549 human lung carcinoma cells. It was shown that MEMA induced the apoptotic cell death proved by increased sub-G1 phase cell population, apoptotic body formation and chromatin condensation. MEMA treatment induced the expression of death receptor-related proteins such as death receptor (DR) 4, DR5, Fas and FasL, which further triggered the activation of caspase-8 and the cleavage of Bid in a concentration-dependent manner. However, MEMA reduced anti-apoptotic Bcl-2 and Bcl-xL expression which contributed to the loss of mitochondrial membrane potential (MMP), and the activations of caspase-9 and caspase-3. Meanwhile, the morphological study indicated a characteristic finding of autophagy, such as the formation of autophagosomes in MEMA-treated cells. Furthermore, markers of autophagy, namely, the increased MDC-positive cells, conversion of microtubule-associated protein light chain 3 (LC3)-I to LC3-II and increased beclin-1 accumulation, were observed. Taken together, these findings demonstrated that MEMA triggered both autophagy and apoptosis in A549 cancer cells. They might suggest that M. alba L. could be a prospective clinical application to treat human lung cancers.
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