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Functional estrogen receptor beta in colon cancer cells
G Fiorelli1, L Picariello, V Martineti
1School of Medicine, University of Florence, Florence, 50139, Italy.
Biochemical and Biophysical Research Communications
|July 30, 1999
Summary
Estrogen receptor beta (ERbeta) is expressed in colon cancer cells, but not estrogen receptor alpha (ERalpha). ERbeta influences cell proliferation differently across various colon cancer cell lines, suggesting potential therapeutic targets.
Area of Science:
- Oncology
- Endocrinology
- Molecular Biology
Background:
- Estrogen receptor beta (ERbeta) expression is known in human colonic mucosa.
- The role of estrogen receptors in colon cancer is an area of ongoing research.
Purpose of the Study:
- To investigate the expression of estrogen receptor alpha (ERalpha) and ERbeta isoforms in human colon adenocarcinoma cell lines.
- To evaluate the binding of 17beta-estradiol (17betaE(2)) and its effect on cell proliferation and progesterone receptor binding.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) and Western blot analysis for receptor expression.
- Scatchard and Hill analysis for [(3)H]17beta-estradiol binding.
- Cell proliferation assays and progesterone receptor binding studies after 17betaE(2) treatment.
Main Results:
- Colon cancer cell lines (HCT116, HCT8, DLD-1, LoVo) lacked ERalpha but expressed wild-type ERbeta (isoform 1) and other ERbeta isoforms (ERbeta2-5).
- Two classes of 17betaE(2) binding sites with high and low affinity were identified.
- 17betaE(2) differentially affected cell proliferation and progesterone receptor binding across cell lines, with some showing induction and others inhibition.
Conclusions:
- ERbeta is expressed in human colon cancer cell lines, while ERalpha is absent.
- ERbeta exhibits distinct effects on colon cancer cell proliferation and signaling pathways.
- These findings suggest ERbeta and its interacting molecules as potential targets for colon cancer therapy.