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The role of PI3K/mTOR inhibition in combination with sorafenib in hepatocellular carcinoma treatment.

Abstract：

BACKGROUND:Deregulated RAS/RAF/MAPK and PI3K/AKT/mTOR signaling pathways are found in hepatocellular carcinoma (HCC). This study aimed to test the inhibitory effects of PI-103 (a small molecule inhibitor of PI3K and mTOR) and sorafenib as single agents and in combination on HCC tumorigenesis in an in vivo xenograft model. MATERIALS AND METHODS:In vitro study: Huh7 proliferation was assayed by 3H-thymidine incorporation and by thiazolyl blue tetrazolium bromide (MTT) assay. Western blots were used to detect phosphorylation of the key enzymes in the two pathways. In vivo study: Human HCC cell line Huh7 was inoculated into nude mice s.c. and the mice were treated with sorafenib (20 mg/kg/day) and PI-103 (5 mg/kg, every 4 days). Tumor size was measured every other day. Tumors were isolated for western blot and Terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay detection of apoptosis and signaling pathway enzymes. RESULTS:Our in vitro study found that combination of sorafenib and PI-103 additively inhibited Huh7 proliferation as compared to single-agent treatment. Sorafenib and PI-103 as single agents differentially inhibited or activated key enzymes (MEK, ERK, AKT, mTOR, and S6K) in PI3K/AKT/mTOR and RAS/RAF/MAPK signaling pathways. Combination of sorafenib and PI-103 inhibited all the key enzymes in the two pathways. Our in vivo study demonstrated significant differences between control group, mono-drug groups and drug-combination group (p<0.05). Combination of Sorafenib and PI-103 more efficiently inhibited tumorigenesis as compared to mono-drug treatments (p<0.032). CONCLUSION:The combination of PI-103 and sorafenib has the advantage over mono-drug therapy on inhibition of HCC cell proliferation and tumorigenesis by inhibiting both PI3K/AKT/mTOR and RAS/RAF/MAPK signaling pathways.

journal_name

Anticancer Res

journal_title

Anticancer research

authors

Gedaly R,Angulo P,Chen C,Creasy KT,Spear BT,Hundley J,Daily MF,Shah M,Evers BM

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

2531-6

issue

7

eissn

0250-7005

issn

1791-7530

pii

32/7/2531

journal_volume

32

pub_type

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