Inhibition of cancer cell growth by GRP78 siRNA lipoplex via activation of unfolded protein response.

Abstract:

:Proteasome inhibitors are a novel class of molecular-targeted anti-cancer drugs that suppress the degradation of malfolded proteins, trigger endoplasmic reticulum (ER) stress, and activate apoptosis signals. Glucose-regulated protein 78 (GRP78), a major ER chaperone, is one of the most important molecules for transduction of unfolded protein response (UPR) signals. In accordance with past findings that expression of GRP78 is elevated in cancer cells and helps to resist stress-induced apoptosis, GRP78 knockdown could be effective in anticancer therapy. We tested this hypothesis and found that transfection of small interfering RNA (siRNA) targeting GRP78 inhibited the growth of RENCA renal carcinoma cells, in association with elevated gene expression of UPR downstream signaling molecules (CHOP, EDEM1, and ERdj4 mRNA). In addition, the combinatorial effect of GRP78 siRNA with ER stress inducers (tunicamycin, MG132, and 2-deoxyglucose) on survival was measured. Combination of GRP78 siRNA and the ER stress inducers more extensively reduced cell viability than combination with scrambled siRNA. Besides RENCA, B16BL6 melanoma cells were also shown to be sensitive to GRP78 siRNA. These results suggest that GRP78 knockdown might be an effective strategy for cancer therapy targeting UPR-induced apoptosis.

journal_name

Biol Pharm Bull

authors

Matsumura K,Sakai C,Kawakami S,Yamashita F,Hashida M

doi

10.1248/bpb.b13-00930

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

648-53

issue

4

eissn

0918-6158

issn

1347-5215

pii

DN/JST.JSTAGE/bpb/b13-00930

journal_volume

37

pub_type

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