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Erschienen in: Tumor Biology 2/2015

01.02.2015 | Research Article

GRP78 mediates the therapeutic efficacy of curcumin on colon cancer

verfasst von: Yu-Jia Chang, Chien-Yu Huang, Chin-Sheng Hung, Wei-Yu Chen, Po-Li Wei

Erschienen in: Tumor Biology | Ausgabe 2/2015

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Abstract

Glucose-regulated protein 78 (GRP78) is the key regulator of endoplasmic reticular (ER) function. Expression of GRP78 was correlated with malignancy in different cancers. However, the role of GRP78 in the cytotoxic effect of curcumin on colon cancer cells is still unclear. A silencing RNA (siRNA) technique was used to knock down GRP78 expression. The anticancer effects of curcumin were assessed by a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, a flow cytometric cell cycle analysis, and a terminal dexynucleotidyl transferase-mediated nick end labeling (TUNEL) assay. HT-29 cells expressed lower GRP78 compared with DLD-1 cells. The MTT assay revealed that HT-29 cells were more resistant to curcumin treatment than DLD-1 cells. GRP78KD cells showed more resistance to curcumin treatment compared with scrambled control cells. Overexpressed GRP78 in HT-29 cells increased the sensitivity to curcumin treatment. According to the cell cycle analysis and TUNEL assay, we found that apoptosis dramatically increased in scrambled control cells compared to GRP78KD DLD-1 cells after curcumin treatment. Finally, we evaluated levels of Bcl-2, BAX, and Bad and found that an increase of Bcl-2 level was observed in GRP78KD cells treated with curcumin. Those results were consistent with the increasing of resistance to curcumin after silencing of GRP78. The levels of GRP78 expression might determine the therapeutic efficacy of curcumin against colon cancer cells.
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Metadaten
Titel
GRP78 mediates the therapeutic efficacy of curcumin on colon cancer
verfasst von
Yu-Jia Chang
Chien-Yu Huang
Chin-Sheng Hung
Wei-Yu Chen
Po-Li Wei
Publikationsdatum
01.02.2015
Verlag
Springer Netherlands
Erschienen in
Tumor Biology / Ausgabe 2/2015
Print ISSN: 1010-4283
Elektronische ISSN: 1423-0380
DOI
https://doi.org/10.1007/s13277-014-2640-3

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