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DNA damage and endoplasmic reticulum stress mediated curcumin-induced cell cycle arrest and apoptosis in human lung carcinoma A-549 cells through the activation caspases cascade- and mitochondrial-dependent pathway.

Abstract：

:Curcumin, a major component of the Curcuma species, is known to have antioxidant, anti-inflammatory properties and induce apoptosis of cancer cells, however, the precise molecular mechanisms of apoptosis in vitro are unclear. In this study, we showed that curcumin, a plant product containing the phenolic phytochemical, caused DNA damage and endoplasmic reticulum (ER) stress and mitochondrial-dependent-induced apoptosis through the activation of caspase-3 at a treatment concentration of 30 microM in human lung cancer A-549 cells. In contrast, treatment with 5-10 microM of curcumin did not induce significant apoptosis, but rather induced G2/M-phase arrest in A-549 cells. Flow cytometric analysis indicated that curcumin directly increased intracellular oxidative stress based on the cell permeable dye, 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) acting as an indicator of reactive oxygen species (ROS) generation. GADD153 and GRP78 were increased by curcumin which was indicative of ER stress. Curcumin increased Ca(2+) levels and the mitochondrial membrane potential (DeltaPsi(m)), was decreased in A-549 cells. Overall, our results demonstrated that curcumin treatment causes cell death by activating pathways inducing G2/M-phase arrest and apoptosis.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Lin SS,Huang HP,Yang JS,Wu JY,Hsia TC,Lin CC,Lin CW,Kuo CL,Gibson Wood W,Chung JG

doi

10.1016/j.canlet.2008.06.031

subject

Has Abstract

pub_date

2008-12-08 00:00:00

pages

77-90

issue

1

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(08)00523-5

journal_volume

272

pub_type

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