Type I Interferons (IFNs) are the first line of defense against viral infections and play an important role in the regulation of cell proliferation. Both effects require the activation of the Jak-STAT pathway however, IFNs activate other pathways that also intervene in its antiviral and antiproliferative functions. The mechanism of the growth inhibitory action of type I IFNs is not completely clear. Moreover, depending on the context, IFNs can have either a cytostatic effect, induce apoptosis, or cells can be completely resistant. In order to discover new proteins that may intervene in the biological effects of type I IFNs, we performed a two-hybrid screening using the IFN-R chains as bait. We have cloned a gene termed BARA. BARA interacts with the betaL chain of the type I interferon receptor. The homolog of BARA in C. elegans is part of the Cyclin D-CDK4-retinoblastoma (RB) pathway (termed pathway B), which in conjunction with another redundant pathway (termed pathway A) negatively regulate cell cycle progression and vulval development. This project will focus on the role of BARA on the cell growth inhibitory effects of type I IFNs.
In Specific Aim 1 we will determine the role of BARA in IFN-induced growth inhibitory effect, apoptosis and cell senescence.
In Specific Aim 2 we will test the hypothesis that the IFN system is the mammalian equivalent to a pathway (pathways B) that in C. elegans negatively regulates EGF-RAS-MAPK pathway.
In Specific Aims 3 we will determine if mice with a homozygous deletion of the BARA gene have alterations of the IFN system. We expect that the goals to be achieved with this proposal will shed light on the understanding of the growth regulatory effects of type I IFNs.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM054709-12
Application #
7087668
Study Section
Allergy and Immunology Study Section (ALY)
Program Officer
Marino, Pamela
Project Start
1996-07-01
Project End
2008-06-30
Budget Start
2006-07-01
Budget End
2007-06-30
Support Year
12
Fiscal Year
2006
Total Cost
$329,959
Indirect Cost
Name
University of Illinois at Chicago
Department
Pharmacology
Type
Schools of Medicine
DUNS #
098987217
City
Chicago
State
IL
Country
United States
Zip Code
60612
Sandoval, Raudel; Pilkinton, Mark; Colamonici, Oscar R (2009) Deletion of the p107/p130-binding domain of Mip130/LIN-9 bypasses the requirement for CDK4 activity for the dissociation of Mip130/LIN-9 from p107/p130-E2F4 complex. Exp Cell Res 315:2914-20
Pilkinton, Mark; Sandoval, Raudel; Barrett, Kelly et al. (2007) Mip/LIN-9 can inhibit cell proliferation independent of the pocket proteins. Blood Cells Mol Dis 39:272-7
Pilkinton, Mark; Sandoval, Raudel; Song, Julie et al. (2007) Mip/LIN-9 regulates the expression of B-Myb and the induction of cyclin A, cyclin B, and CDK1. J Biol Chem 282:168-75
Pilkinton, M; Sandoval, R; Colamonici, O R (2007) Mammalian Mip/LIN-9 interacts with either the p107, p130/E2F4 repressor complex or B-Myb in a cell cycle-phase-dependent context distinct from the Drosophila dREAM complex. Oncogene 26:7535-43
Sandoval, Raudel; Xue, Jiaping; Tian, Xinyong et al. (2006) A mutant allele of BARA/LIN-9 rescues the cdk4-/- phenotype by releasing the repression on E2F-regulated genes. Exp Cell Res 312:2465-75
Datta, Abhishek; Nag, Alo; Pan, Wei et al. (2004) Myc-ARF (alternate reading frame) interaction inhibits the functions of Myc. J Biol Chem 279:36698-707
Sandoval, Raudel; Xue, Jiaping; Pilkinton, Mark et al. (2004) Different requirements for the cytostatic and apoptotic effects of type I interferons. Induction of apoptosis requires ARF but not p53 in osteosarcoma cell lines. J Biol Chem 279:32275-80
Usacheva, Anna; Tian, Xinyong; Sandoval, Raudel et al. (2003) The WD motif-containing protein RACK-1 functions as a scaffold protein within the type I IFN receptor-signaling complex. J Immunol 171:2989-94
Usacheva, Anna; Sandoval, Raudel; Domanski, Paul et al. (2002) Contribution of the Box 1 and Box 2 motifs of cytokine receptors to Jak1 association and activation. J Biol Chem 277:48220-6
Usacheva, A; Smith, R; Minshall, R et al. (2001) The WD motif-containing protein receptor for activated protein kinase C (RACK1) is required for recruitment and activation of signal transducer and activator of transcription 1 through the type I interferon receptor. J Biol Chem 276:22948-53

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