Bone marrow stromal cell-derived growth inhibitor inhibits growth and migration of breast cancer cells via induction of cell cycle arrest and apoptosis.

Abstract	Genes encoding growth-inhibitory proteins are postulated to be candidate tumor suppressors. The identification of such proteins may benefit the early diagnosis and therapy of tumors. Here we report the cloning and functional characterization of a novel human bone marrow stromal cell (BMSC)-derived growth inhibitor (BDGI) by large scale random sequencing of a human BMSC cDNA library. Human BDGI cDNA encodes a 477-amino acid residue protein that shares high homology with rat and mouse pregnancy-induced growth inhibitors. The C-terminal of BDGI is identical to a novel human pregnancy-induced growth inhibitor, OKL38. BDGI is also closely related to many other eukaryotic proteins, which together form a novel and highly conserved family of BDGI-like proteins. BDGI overexpression inhibits the proliferation, decreases anchorage-dependent growth, and reduces migration of MCF-7 human breast cancer cells, whereas down-regulation of BDGI expression promotes the proliferation of MCF-7 and HeLa cervix epitheloid carcinoma cells. Interestingly, the inhibitory effect of BDGI on MCF-7 cells is more potent than that of OKL38. We demonstrate that BDGI induces cell cycle arrest in S phase and subsequent apoptosis of MCF-7 cells, which is likely to account for the antiproliferative effects of BDGI. This process may involve up-regulation of p27Kip1 and down-regulation of cyclin A, Bcl-2, and Bcl-xL. The inhibitory effect of BDGI on cell proliferation and the induction of apoptosis were also observed in A549 lung cancer cells but not HeLa cells. These results indicate that BDGI might be a growth inhibitor for human tumor cells, especially breast cancer cells, possibly contributing to the development of new therapeutic strategies for breast cancer.
Authors	Tao Wang, Dajing Xia, Nan Li, Chunmei Wang, Taoyong Chen, Tao Wan, Guoyou Chen, Xuetao Cao
Journal	The Journal of biological chemistry (J Biol Chem) Vol. 280 Issue 6 Pg. 4374-82 (Feb 11 2005) ISSN: 0021-9258 [Print] United States
PMID	15569677 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Retracted Publication)
Chemical References	Apoptosis Regulatory Proteins BCL2L1 protein, human Cell Cycle Proteins Coloring Agents Cyclin A DNA, Complementary OSGIN1 protein, human Proteins Proto-Oncogene Proteins c-bcl-2 RNA, Messenger RNA, Small Interfering Tetrazolium Salts Thiazoles Tumor Suppressor Proteins bcl-X Protein Cyclin-Dependent Kinase Inhibitor p27 thiazolyl blue
Topics	Amino Acid Sequence Animals Apoptosis Apoptosis Regulatory Proteins Blotting, Northern Blotting, Western Bone Marrow Cells (metabolism) Breast Neoplasms (metabolism, pathology) Cell Cycle Cell Cycle Proteins (metabolism) Cell Line, Tumor Cell Movement Cell Proliferation Coloring Agents (pharmacology) Cyclin A (metabolism) Cyclin-Dependent Kinase Inhibitor p27 DNA, Complementary (metabolism) Down-Regulation Gene Library Genetic Vectors HeLa Cells Humans Molecular Sequence Data Phylogeny Proteins (genetics, metabolism, pharmacology, physiology) Proto-Oncogene Proteins c-bcl-2 (metabolism) RNA, Messenger (metabolism) RNA, Small Interfering (metabolism) Reverse Transcriptase Polymerase Chain Reaction S Phase Sequence Analysis, DNA Sequence Homology, Amino Acid Tetrazolium Salts (pharmacology) Thiazoles (pharmacology) Tissue Distribution Transfection Tumor Suppressor Proteins (metabolism) Up-Regulation Wound Healing bcl-X Protein

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