T47D breast cancer cell growth is inhibited by expression of VACM-1, a cul-5 gene

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Maria A Burnatowska-Hledin1, Jennifer B Kossoris, Christa J Van Dort

  • 1Department of Biology, Peale Science Center, Hope College, Holland, MI 49422-9000, USA. hledin@hope.edu

Biochemical and Biophysical Research Communications
|June 9, 2004
PubMed

Insights

Vasopressin-activated calcium-mobilizing (VACM-1) gene expression attenuated breast cancer cell proliferation and altered specific gene expression. VACM-1 plays a role in regulating cellular growth.

Area of Science:

  • Molecular biology
  • Genetics
  • Cancer research

Background:

  • Vasopressin-activated calcium-mobilizing (VACM-1) is a cul-5 gene located on chromosome 11q22-23.
  • This chromosomal region shows loss of heterozygosity in breast cancer samples, suggesting a potential role in tumorigenesis.

Purpose of the Study:

  • To investigate the biological role of VACM-1 in breast cancer.
  • To examine the effects of VACM-1 expression on cellular growth and gene expression in T47D breast cancer cells.

Main Methods:

  • Immunocytochemistry to determine VACM-1 expression and localization in T47D cells.
  • Overexpression of VACM-1 in T47D cells.
  • Analysis of cellular proliferation, MAPK phosphorylation, and mRNA levels of egr-1 and Fas-L.
  • Western blot analysis of egr-1 protein levels in nuclear fractions.

Main Results:

  • VACM-1 was detected in a small percentage of T47D cells, localizing to the nucleus of mitotic cells.
  • Overexpression of VACM-1 significantly reduced cellular proliferation and MAPK phosphorylation.
  • VACM-1 modulated gene expression by decreasing egr-1 mRNA and increasing Fas-L mRNA levels.
  • Nuclear egr-1 protein levels were significantly lower in VACM-1 transfected cells.

Conclusions:

  • VACM-1 expression is associated with reduced proliferation in T47D breast cancer cells.
  • VACM-1 influences cellular growth regulation through modulation of specific gene expression, including egr-1 and Fas-L.

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