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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Inhibition of MEK blocks GRP78 up-regulation and enhances apoptosis induced by ER stress in gastric cancer cells.
Cancer Letters 2009 Februrary 9
We studied potential interactions between the endoplasmic reticulum (ER) stress response and the MEK/ERK pathway. Induction of ER stress did not trigger significant apoptosis, but caused rapid activation of ERK1/2 in gastric cancer cells. Inhibition of MEK enhanced ER stress-induced apoptosis via a caspase-dependent, mitochondria-mediated mechanism. This was associated with blockage of ER stress-mediated up-regulation of GRP78. The latter appeared to be critical in antagonizing the apoptosis-inducing potential of ER stress. Thus, activation of MEK/ERK by ER stress is necessary for induction of GRP78 that protects against apoptosis in gastric cancer cells submitted to ER stress.
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