Background: Retinoic acid-regulated nuclear matrix-associated protein (RAMP) is a WD40 repeat-containing protein that is involved in various biological functions, but little is known about its role in human cancer. This study aims to delineate the oncogenic role of RAMP in gastric carcinogenesis

A Chavez-Reyes

C Y P Wong

CL Liu

CM Pfleger

D Banks

DL Rimm

DM Parkin

DW Nicholson

E K O Ng

E Yonish-Rouach

F K L Chan

FJ Oliver

G Callagy

H Jin

H Yokozaki

HW Pan

J J Y Sung

J Li

J Tong

J Yu

K F To

LA Higa

M P A Ebert

M Y Y Go

N Y Ip

P K F Cheung

PP McKenzie

RM Peek

S Angers

SW Lowe

T Matozaki

T Ueki

U Kurzik-Dumke

UM Moll

V Y Y Cheng

W K Leung

WM Cheung

XH Jiang

Y Jing

Y P Ng

Y Wang

YP Tsao

English

PubMed

Crossref

Identification of retinoic acid-regulated nuclear matrix-associated protein as a novel regulator of gastric cancer

Background: Retinoic acid-regulated nuclear matrix-associated protein (RAMP) is a WD40 repeat-containing protein that is involved in various biological functions, but little is known about its role in human cancer. This study aims to delineate the oncogenic role of RAMP in gastric carcinogenesis.Methods: RAMP expression was examined by real-time quantitative RT-PCR, immunohistochemistry and western blotting. Inhibition of RAMP expression was performed by siRNA-mediated knockdown. The functional effects of RAMP on cell kinetics were measured by cell viability assay, colony formation assay and flow cytometry. Cell lines stably expressing RAMP were established to investigate the oncogenic effects of RAMP in vitro.Results: Ramp was readily expressed in all seven gastric cancer cell lines and was significantly increased in human gastric cancer tissues when compared with their adjacent non-cancerous tissues (P0.001). In keeping with this, expression of RAMP protein was higher in gastric cancer tissues compared with their adjacent non-cancerous tissues, whereas moderate protein expression were noted in intestinal metaplasia. Knockdown of RAMP in gastric cancer cells significantly reduced cell proliferation (P0.01) and soft agar colony formation (P0.001), but induced apoptosis and G 2 /M arrest. In additional, knockdown RAMP induced cell apoptosis is dependent on functional accumulation of p53 and p21 and induction of cleaved caspases-9, caspases-3 and PARP. Strikingly, overexpression of RAMP promoted anchorage-independent cell growth in soft agar.Conclusion: Our findings demonstrate that RAMP plays an oncogenic role in gastric carcinogenesis. Inhibition of RAMP may be a promising approach for gastric cancer therapy. © 2009 Cancer Research UK.published_or_final_versio

Li, J

Ng, EKO

Ng, YP

Wong, CYP

Yu, J

Jin, H

Cheng, VYY

Go, MYY

Cheung, PKF

Ebert, MPA

Tong, J

To, KF

Chan, FKL

Sung, JJY

Ip, NY

Leung, WK

HKU Scholars Hub

British Journal of Cancer

BACKGROUND: Retinoic acid-regulated nuclear matrix-associated protein (RAMP) is a WD40 repeat-containing protein that is involved in various biological functions, but little is known about its role in human cancer. This study aims to delineate the oncogenic role of RAMP in gastric carcinogenesis. METHODS: RAMP expression was examined by real-time quantitative RT-PCR, immunohistochemistry and western blotting. Inhibition of RAMP expression was performed by siRNA-mediated knockdown. The functional effects of RAMP on cell kinetics were measured by cell viability assay, colony formation assay and flow cytometry. Cell lines stably expressing RAMP were established to investigate the oncogenic effects of RAMP in vitro. RESULTS: Ramp was readily expressed in all seven gastric cancer cell lines and was significantly increased in human gastric cancer tissues when compared with their adjacent non-cancerous tissues (P < 0.001). In keeping with this, expression of RAMP protein was higher in gastric cancer tissues compared with their adjacent non-cancerous tissues, whereas moderate protein expression were noted in intestinal metaplasia. Knockdown of RAMP in gastric cancer cells significantly reduced cell proliferation (P < 0.01) and soft agar colony formation (P < 0.001), but induced apoptosis and G(2)/M arrest. In additional, knockdown RAMP induced cell apoptosis is dependent on functional accumulation of p53 and p21 and induction of cleaved caspases-9, caspases-3 and PARP. Strikingly, overexpression of RAMP promoted anchorage-independent cell growth in soft agar. CONCLUSION: Our findings demonstrate that RAMP plays an oncogenic role in gastric carcinogenesis. Inhibition of RAMP may be a promising approach for gastric cancer therapy. British Journal of Cancer (2009) 101, 691-698. doi: 10.1038/sj.bjc.6605202 www.bjcancer.com (C) 2009 Cancer Research U

Li, J.

Ng, E.K.O.

Ng, Yu Pong

Wong, C.Y.P.

Yu, J.

Jin, H.

Cheng, V.Y.Y.

Go, M.Y.Y.

Cheung, P.K.F.

Ebert, M.P.A.

Tong, J.

To, K.F.

Chan, F.K.L.

Sung, J.J.Y.

Ip, Nancy Yuk-Yu

Leung, W.K.

Hong Kong University of Science and Technology Institutional Repository

Molecular architecture and assembly of the DDB1-CUL4A ubiquitin ligase machinery.

p53 is required for radiation induced apoptosis in mouse thymocytes.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2736823

Identification of retinoic acid-regulated nuclear matrix-associated protein as a novel regulator of gastric cancer

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HKU Scholars Hub

Hong Kong University of Science and Technology Institutional Repository