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http://dx.doi.org/10.4196/kjpp.2010.14.6.365

Melatonin Induces Apoptotic Cell Death via p53 in LNCaP Cells  

Kim, Chi-Hyun (Department of Biomedical Engineering, College of Health Science, Yonsei University)
Yoo, Yeong-Min (Department of Biomedical Engineering, College of Health Science, Yonsei University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.14, no.6, 2010 , pp. 365-369 More about this Journal
Abstract
In this study, we examined whether melatonin promotes apoptotic cell death via p53 in prostate LNCaP cells. Melatonin treatment significantly curtailed the growth of LNCaP cells in a dose- and time-dependent manner. Melatonin treatment (0 to 3 mM) induced the fragmentation of poly(ADP-ribose) polymerase (PARP) and activation of caspase-3, caspase-8, and caspase-9. Moreover, melatonin markedly activated Bax expression and decreased Bcl-2 expression in dose increments. To investigate p53 and p21 expression, LNCaP cells were treated with 0 to 3 mM melatonin. Melatonin increased the expressions of p53, p21, and p27. Treatment with mitogen-activated protein kinase (MAPK) inhibitors, PD98059 (ERK inhibitor), SP600125 (JNK inhibitor) and SB202190 (p38 inhibitor), confirmed that the melatonin-induced apoptosis was p21-dependent, but ERK-independent. With the co-treatment of PD98059 and melatonin, the expression of p-p53, p21, and MDM2 did not decrease. These effects were opposite to the expression of p-p53, p21, and MDM2 observed with SP600125 and SB202190 treatments. Together, these results suggest that p53-dependent induction of JNK/p38 MAPK directly participates in apoptosis induced by melatonin.
Keywords
Melatonin; p53; p38; JNK; LNCaP cells;
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