Cell cycle regulation of BRCA1 messenger RNA in human breast epithelial cells

Jean M. Gudas, Tao Li, Hoang Nguyen, David Jensen, Frank J. Rauscher, Kenneth H. Cowan

Research output: Contribution to journalArticle

145 Citations (Scopus)

Abstract

BRCA1 was originally isolated as a gene that conferred susceptibility to early-onset familial breast and ovarian cancers. The function and regulation of this gene is presently unknown. Northern blot analyses using probes that recognize different regions of the BRCA1 cDNA revealed the presence of at least two distinct mRNA species. In synchronized normal and immortalized human mammary epithelial cells, BRCA1 mRNA levels were high in exponentially growing populations, decreased upon growth factor withdrawal, and subsequently increased again in late G1 just prior to S-phase entry. BRCA1 mRNA levels were found to be dramatically reduced in senescent normal human mammary epithelial cells and in normal human mammary epithelial cells treated with transforming growth factor β1. When considered together, these data indicate that expression of BRCA1 mRNA is highly sensitive to changes in growth conditions in vitro. BRCA1 proteins with apparent molecular weights of M(r) 210,000, 185,000, 160,000, 135,000, and 85,000, respectively, were detected at varying levels in all breast epithelial cells examined. Further molecular characterization of the nature and function of the different BRCA1 mRNAs and proteins should increase our understanding of this gene in the etiology of human breast cancers.

Original languageEnglish (US)
Pages (from-to)717-723
Number of pages7
JournalCell Growth and Differentiation
Volume7
Issue number6
StatePublished - Nov 7 1996

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Cell Cycle
Breast
Epithelial Cells
Messenger RNA
BRCA1 Protein
Genes
Transforming Growth Factors
S Phase
Northern Blotting
Ovarian Neoplasms
Intercellular Signaling Peptides and Proteins
Complementary DNA
Molecular Weight
Breast Neoplasms
Growth
Population

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Cite this

Gudas, J. M., Li, T., Nguyen, H., Jensen, D., Rauscher, F. J., & Cowan, K. H. (1996). Cell cycle regulation of BRCA1 messenger RNA in human breast epithelial cells. Cell Growth and Differentiation, 7(6), 717-723.

Cell cycle regulation of BRCA1 messenger RNA in human breast epithelial cells. / Gudas, Jean M.; Li, Tao; Nguyen, Hoang; Jensen, David; Rauscher, Frank J.; Cowan, Kenneth H.

In: Cell Growth and Differentiation, Vol. 7, No. 6, 07.11.1996, p. 717-723.

Research output: Contribution to journalArticle

Gudas, JM, Li, T, Nguyen, H, Jensen, D, Rauscher, FJ & Cowan, KH 1996, 'Cell cycle regulation of BRCA1 messenger RNA in human breast epithelial cells', Cell Growth and Differentiation, vol. 7, no. 6, pp. 717-723.
Gudas, Jean M. ; Li, Tao ; Nguyen, Hoang ; Jensen, David ; Rauscher, Frank J. ; Cowan, Kenneth H. / Cell cycle regulation of BRCA1 messenger RNA in human breast epithelial cells. In: Cell Growth and Differentiation. 1996 ; Vol. 7, No. 6. pp. 717-723.
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