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Document 0969
DOCN M9460969
TI Characterization of a transcriptional activator in the envelope gene of
mouse mammary tumor virus.
DT 9406
AU Miller CL; Univ. of Alberta, Canada
SO Diss Abstr Int [B]; 54(3):1387 1993. Unique Identifier : AIDSLINE
ICDB/94697102
AB Mouse mammary tumor virus (MMTV) is the causative agent of mammary
carcinomas in certain mouse strains. There is also evidence indicating
that it may be associated with the development of T lymphomas.
Transcription of the complete MMTV proviral genome in mouse cells is
controlled by a strong promoter in its long terminal repeat (LTR). In
the mouse T lymphoma cell line EL4.E1, there is a second,
activation-dependent, transcriptional activator sequence within the MMTV
envelope (env) gene. Phorbol ester treatment of EL4.E1 cells generates a
transcript initiating within the env gene, which includes the open
reading frame gene of the 3' LTR. I have isolated and characterized a
segment of the MMTV env gene (called META for MMTV env transcriptional
activator). META was linked to the chloramphenicol acetyltransferase
(CAT) gene for use in transient-expression assays. META induced
activation-dependent, T lymphocyte-specific expression of the CAT gene.
It was active in mouse and human T helper cell lines but not in other
cell types. META activity was dependent on activation of the T helper
cell line with the same stimuli which induced cytokine production and
its activity was suppressible by the immunosuppressive drug, Cyclosporin
A. META has been isolated from EL4.E1 cells, from a T cell hybridoma,
and from BALB/c spleen cells. It was also demonstrated that a portion of
META acts as an inducible, orientation-independent, CsA-sensitive
enhancer when linked to a heterologous promoter. A model for the
potential involvement of META in MMTV-induced T lymphomagenesis is
presented. (Full text available from University Microfilms
International, Ann Arbor, MI, as Order No. AADNN-77372)
DE Animal Chloramphenicol Acetyltransferase/GENETICS
Cyclosporine/PHARMACOLOGY Gene Expression Gene Products, env/*GENETICS
Lymphocyte Transformation Lymphoma, T-Cell/*GENETICS Mammary Tumor
Viruses, Mouse/DRUG EFFECTS/*GENETICS Mice Promoter Regions (Genetics)
Repetitive Sequences, Nucleic Acid T-Lymphocytes,
Helper-Inducer/IMMUNOLOGY *Trans-Activation (Genetics) THESIS
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).