Interferons (IFNs) are a family of multifunctional cytokines occurring in vertebrates. They have antiviral antiprotozoal, cell growth regulatory, and immunomodulatory activities. These are three kinds of IFNs: alpha, beta gamma. The alpha and beta IFNs share similar sequences. Their information can be induced in a large variety of cells by viruses, double-stranded RNA, and mitogens. The formation of gamma IFN can be induced in lymphocytes by antigens to which the cells had been sensitized and by mitogens. The IFNs produced are secreted. They interact with specific cell surface receptors on cells and alter the biological and biochemical characteristics of the cells. At least some of the alterations are mediated by proteins whose formation is induced by the IFNs. The induced proteins include enzymes, e.g., at least four (2'-5') oligoadenylate synthetase isoenzymes and eIF-2 kinase. The listed enzymes are latent unless activated by binding double-stranded RNA. They were shown to be among the mediators of the antiviral activities of IFNs. We have isolated several cDNA clones which correspond to MRNAs whose levels are increased in cells exposed to IFNs. We have also identified genes whose rate of transcription is increased by IFNs. The upstream flanking regions of these genes include sequences which are IFN-activatable enhancers. We characterized a cluster of at least six adjacent, IFN-activatable genes which is closely linked to the erythroid alpha spectrin, the serum amyloid protein, and the mixed lymphocyte-stimulatory loci on murine chromosome 1. Partial sequencing of these genes and complete sequencing of two cDNAs revealed that there is much sequence similarity between the genes in the cluster and also between the 5' flanking regions of at least three of the genes, and that the cluster arose in consequence of repeated gene multiplications. The expression of the genes in the cluster is apparently coordinately regulated by IFNs. We are planning to continue with the characterization of the cluster by (a) completing the sequencing of the cCDNAs corresponding to its genes, (b) preparing antibodies to the proteins specified and using these to determine the tissue distribution and subcellular localization of the proteins, (c) completing the cosmid mapping of the region and searching for further, adjacent, IFN- activatable genes, and (d) studying the functions of the proteins specified by transfecting into mammalian cells constitutive expression vectors and examining the growth characteristics, the antiviral state, and the immunological characteristics of the transfected cells. Other projects in the laboratory concern (a) the identification of the RNA activating the latent, IFN- inducible, (2'-5') oligoadenylate synthetase isoenzymes in various virus-infected cells and uninfected cells; (b) the determination if the inhibition of the early phase of SV40 infection by IFNs is mediated by double stranded RNA-dependent pathways, and (c) the possible role of translational control in the inhibition of cell proliferation by IFNs.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
4R37AI012320-21
Application #
2059875
Study Section
Special Emphasis Panel (NSS)
Project Start
1974-10-01
Project End
1999-11-30
Budget Start
1994-12-01
Budget End
1995-11-30
Support Year
21
Fiscal Year
1995
Total Cost
Indirect Cost
Name
Yale University
Department
Physiology
Type
Schools of Arts and Sciences
DUNS #
082359691
City
New Haven
State
CT
Country
United States
Zip Code
06520
Lengyel, Peter; Liu, C J (2010) The p200 family protein p204 as a modulator of cell proliferation and differentiation: a brief survey. Cell Mol Life Sci 67:335-40
Liu, C j; Wang, H; Zhao, Z et al. (2000) MyoD-dependent induction during myoblast differentiation of p204, a protein also inducible by interferon. Mol Cell Biol 20:7024-36
Wang, H; Liu, C; Lu, Y et al. (2000) The interferon- and differentiation-inducible p202a protein inhibits the transcriptional activity of c-Myc by blocking its association with Max. J Biol Chem 275:27377-85
Wang, H; Chatterjee, G; Meyer, J J et al. (1999) Characteristics of three homologous 202 genes (Ifi202a, Ifi202b, and Ifi202c) from the murine interferon-activatable gene 200 cluster. Genomics 60:281-94
Datta, B; Min, W; Burma, S et al. (1998) Increase in p202 expression during skeletal muscle differentiation: inhibition of MyoD protein expression and activity by p202. Mol Cell Biol 18:1074-83
Min, W; Ghosh, S; Lengyel, P (1996) The interferon-inducible p202 protein as a modulator of transcription: inhibition of NF-kappa B, c-Fos, and c-Jun activities. Mol Cell Biol 16:359-68
Datta, B; Li, B; Choubey, D et al. (1996) p202, an interferon-inducible modulator of transcription, inhibits transcriptional activation by the p53 tumor suppressor protein, and a segment from the p53-binding protein 1 that binds to p202 overcomes this inhibition. J Biol Chem 271:27544-55
Choubey, D; Li, S J; Datta, B et al. (1996) Inhibition of E2F-mediated transcription by p202. EMBO J 15:5668-78
Choubey, D; Lengyel, P (1995) Binding of an interferon-inducible protein (p202) to the retinoblastoma protein. J Biol Chem 270:6134-40
Choubey, D; Lengyel, P (1993) Interferon action: cytoplasmic and nuclear localization of the interferon-inducible 52-kD protein that is encoded by the Ifi 200 gene from the gene 200 cluster. J Interferon Res 13:43-52

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