Document Detail

Inhibition of T-cell proliferation by a MYB antisense oligomer is accompanied by selective down-regulation of DNA polymerase alpha expression.
MedLine Citation:
PMID:  1696013     Owner:  NLM     Status:  MEDLINE    
We recently found that inhibition of MYB protein synthesis in human peripheral blood mononuclear cells (PBMC) exposed to human c-myb (designated MYB) antisense oligodeoxynucleotides prevents entry into S phase and cell proliferation. To determine the mechanism(s) by which down-regulation of human c-myb protein (MYB) synthesis interferes with DNA synthesis, we analyzed mRNA levels of DNA polymerase alpha and proliferating cell nuclear antigen (PCNA), transcripts of two genes required for DNA synthesis, in normal and leukemic T lymphocytes exposed to MYB antisense oligodeoxynucleotides. Expression of DNA polymerase alpha was inhibited both in normal T lymphocytes progressing from G0 to S phase and in exponentially growing CCRF-CEM leukemic cells, whereas expression of PCNA was inhibited only in mitogen-stimulated PBMC and remained essentially unaffected in the leukemia T-cell line. The functional link between expression of MYB and DNA polymerase alpha mRNAs was further demonstrated by analyzing DNA polymerase alpha mRNA levels in a temperature-sensitive (ts) fibroblast cell line (TK-ts13; TK is thymidine kinase) constitutively expressing human MYB mRNA driven by the simian virus 40 (SV40) promoter. In the MYB-expressing TK-ts13 cells, DNA polymerase alpha mRNA levels were unaffected following shift to the nonpermissive temperature of 39.6 degrees C, whereas in the parental line, DNA polymerase alpha mRNA levels were readily down-regulated. These findings indicate that the expression of MYB is related to that of DNA polymerase alpha in cells expressing MYB at high levels and suggest that there is a functional link between c-myb and DNA polymerase alpha mRNA expression during cell cycle progression of normal T lymphocytes.
D Venturelli; S Travali; B Calabretta
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  87     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  1990 Aug 
Date Detail:
Created Date:  1990-09-04     Completed Date:  1990-09-04     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  5963-7     Citation Subset:  IM    
Department of Pathology, Temple University Medical School, Philadelphia, PA 19140.
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MeSH Terms
Cell Division
Cell Line
Cells, Cultured
DNA Polymerase II / genetics*
DNA Replication
Dactinomycin / pharmacology
Nuclear Proteins / genetics
Oligodeoxyribonucleotides / pharmacology*
Polymerase Chain Reaction
Proliferating Cell Nuclear Antigen
Protein-Tyrosine Kinases / genetics
Proto-Oncogene Proteins / genetics*
Proto-Oncogene Proteins c-myb
RNA / genetics
RNA, Antisense
RNA, Messenger / antagonists & inhibitors,  genetics*
T-Lymphocytes / cytology*,  enzymology
Transcription, Genetic
Tumor Cells, Cultured / cytology,  drug effects,  enzymology
Grant Support
Reg. No./Substance:
0/Nuclear Proteins; 0/Oligodeoxyribonucleotides; 0/Proliferating Cell Nuclear Antigen; 0/Proto-Oncogene Proteins; 0/Proto-Oncogene Proteins c-myb; 0/RNA, Antisense; 0/RNA, Messenger; 50-76-0/Dactinomycin; 63231-63-0/RNA; EC Kinases; EC 2.7.7.-/DNA Polymerase II

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