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Identification of a new tumor suppressor gene located at chromosome 8p21.3–22
Author(s) -
Seibold Stefan,
Rudroff Claudia,
Weber Manfred,
Galle Jan,
Wanner Christoph,
Marx Martin
Publication year - 2003
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.02-0934fje
Subject(s) - carcinogenesis , biology , tumor suppressor gene , microbiology and biotechnology , suppressor , gene expression , cell growth , gene , cell culture , immunocytochemistry , cancer research , genetics , endocrinology
Transformation of normal cells into malignant tumor cells, a process termed carcinogenesis, depends on progressive acquisition of genetic alterations. These result in activation of protooncogenes or inactivation of tumor suppressor genes responsible for the loss of proliferative control in tumor cells and the failure to undergo cellular differentiation. The aim of our study was the identification of molecular regulators of carcinogenesis by studying gene expression during induction of cellular differentiation and quiescence in a three‐dimensional (3D) cell culture model. Here, we report the discovery of a tumor suppressor gene located at chromosome 8p21.3–22 near marker D8S254. It is ubiquitously expressed in normal tissue and transiently up‐regulated during initiation of cellular differentiation and quiescence in 3D cell culture. In contrast, mRNA expression was not detectable in tissue from pancreatic tumor and the pancreatic tumor cell line MIA PaCa‐2. Recombinant expression in the tumor cell line MIA PaCa‐2 inhibited proliferation, as shown by a 30% reduction of BrdU uptake after recombinant expression. Immunocytochemistry and Western blot analysis of subcellular fractions demonstrated a mitochondrial localization for the mature protein. In conclusion, we identified a tumor suppressor gene at chromosome 8p21.3–22, encoding a mitochondrial protein, controlling cellular proliferation.