The Melanoma Differentiation Associated Gene Mda-7 Suppresses Cancer Cell Growth

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1996 Aug 20

PMID 8799171

Citations 76

Authors

H Jiang

Z Z Su

J J Lin

N I Goldstein

C S Young

P B Fisher

Affiliations

Soon will be listed here.

Abstract

Cancer is a disease characterized by defects in growth control, and tumor cells often display abnormal patterns of cellular differentiation. The combination of recombinant human fibroblast interferon and the antileukemic agent mezerein corrects these abnormalities in cultured human melanoma cells resulting in irreversible growth arrest and terminal differentiation. Subtraction hybridization identifies a melanoma differentiation associated gene (mda-7) with elevated expression in growth arrested and terminally differentiated human melanoma cells. Colony formation decreases when mda-7 is transfected into human tumor cells of diverse origin and with multiple genetic defects. In contrast, the effects of mda-7 on growth and colony formation in transient transfection assays with normal cells, including human mammary epithelial, human skin fibroblast, and rat embryo fibroblast, is quantitatively less than that found with cancer cells. Tumor cells expressing elevated mda-7 display suppression in monolayer growth and anchorage independence. Infection with a recombinant type 5 adenovirus expressing antisense mda-7 eliminates mda-7 suppression of the in vitro growth and transformed phenotype. The ability of mda-7 to suppress growth in cancer cells not expressing or containing defects in both the retinoblastoma (RB) and p53 genes indicates a lack of involvement of these critical tumor suppressor elements in mediating mda-7-induced growth inhibition. The lack of protein homology of mda-7 with previously described growth suppressing genes and the differential effect of this gene on normal versus cancer cells suggests that mda-7 may represent a new class of cancer growth suppressing genes with antitumor activity.

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