NDLI: Functional identification of distinct sets of antitumor activities mediated by the FKBP gene family

Content Provider	PubMed Central
Author	Fong, Sylvia Mounkes, Leslie Liu, Yong Maibaum, Michael Alonzo, Eric Desprez, Pierre-yves Thor, Ann D. Kashani-sabet, Md Debs, Robert J.
Copyright Year	2003
Abstract	Assigning biologic function to the many sequenced but still uncharacterized genes remains the greatest obstacle confronting the human genome project. Differential gene expression profiling routinely detects uncharacterized genes aberrantly expressed in conditions such as cancer but cannot determine which genes are functionally involved in such complex phenotypes. Integrating gene expression profiling with specific modulation of gene expression in relevant disease models can identify complex biologic functions controlled by currently uncharacterized genes. Here, we used systemic gene transfer in tumor-bearing mice to identify novel antiinvasive and antimetastatic functions for Fkbp8, and subsequently for Fkbp1a. Fkbp8 is a previously uncharacterized member of the FK-506-binding protein (FKBP) gene family down-regulated in aggressive tumors. Antitumor effects produced by Fkbp1a gene expression are mediated by cellular pathways entirely distinct from those responsible for antitumor effects produced by Fkbp1a binding to its bacterially derived ligand, rapamycin. We then used gene expression profiling to identify syndecan 1 (Sdc1) and matrix metalloproteinase 9 (MMP9) as genes directly regulated by Fkbp1a and Fkbp8. FKBP gene expression coordinately induces the expression of the antiinvasive Sdc1 gene and suppresses the proinvasive MMP9 gene. Conversely, short interfering RNA-mediated suppression of Fkbp1a increases tumor cell invasion and MMP9 levels, while down-regulating Sdc1. Thus, syndecan 1 and MMP9 appear to mediate the antiinvasive and antimetastatic effects produced by FKBP gene expression. These studies show that uncharacterized genes differentially expressed in metastatic cancers can play important functional roles in the metastatic phenotype. Furthermore, identifying gene regulatory networks that function to control tumor progression may permit more accurate modeling of the complex molecular mechanisms of this disease.
Related Links	http://dx.doi.org/10.1073/pnas.2332307100
Ending Page	14258
Page Count	6
Starting Page	14253
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	24
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-11-25
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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