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Melatonin Rescues Human Dental Pulp Cells from Premature Senescence Induced by H2O2
박세라,박광제,옥창엽,박현주,장혜옥,배문경,배문경,배수경 대한구강생물학회 2017 International Journal of Oral Biology Vol.42 No.3
Although anti-aging activities of melatonin, a hormone secreted by the pineal gland, have been reported in senescence-accelerated mouse models and several types of cells, its impact and mechanism on the senescence of human dental pulp cells (HDPCs) remains unknown. In this study, we examined the impact of melatonin on cellular premature senescence of HDPCs. Here, we found that melatonin markedly inhibited senescent characteristics of HDPCs after exposure to hydrogen peroxide (H2O2), including the increase in senescence-associated β-galactosidase (SA-β -gal)-positive HDPCs and the upregulation of p21 protein, an indicator for senescence. In addition, as melatonin attenuated H2O2-stimulated phosphorylation of c-Jun N-terminal kinase (JNK), while selective inhibition of JNK activity with SP600125 significantly attenuated H2O2-induced increase in SA-beta-gal activity. Results reveal that melatonin antagonizes premature senescence of HDPCs via JNK pathway. Thus, melatonin may have therapeutic potential to prevent stress-induced premature senescence, possibly correlated with development of dental pulp diseases, and to maintain oral health across the life span.
유방암세포 성장과 Bmi-1 발현에 대한 레스베라트롤의 억제 효과
박현주(Hyun-Joo Park),박광제(Kwang Je Bak),옥창엽(Chang Youp Ok),장혜옥(Hye-Ock Jang),배문경(Moon-Kyoung Bae),배수경(Soo-Kyung Bae) 한국생물공학회 2017 KSBB Journal Vol.32 No.3
Resveratrol has been actively investigated as an anticancer drug since it induces cell growth inhibition and apoptosis in many cancer cells. Resveratrol acts through modulation of multiple pathways and genes. In this study, we found resveratrol reduced cell growth and mammosphere formation in MDA-MB-231 triple-negative human breast cancer cells. This suppressive effect of resveratrol is accompanied by a reduction in Bmi-1 gene expression. We also observed that knockdown of Bmi-1 gene by small interfering RNA effectively sensitizes breast cancer cells to resveratrol treatment. Our data demonstrate, for the first time, that resveratrol down-regulates Bmi-1 expression in human breast cancer cells and suggest that specific molecular targeting of Bmi-1 can be combined with a chemotherapeutic strategy to improve the response of breast cancer cells to resveratrol.