Poster Presentation 6th Australian Health and Medical Research Congress 2012


Olga A Sukocheva 1 , Alfiya Ansar 2 , Chris Wee 1 , Damian J Hussey 2 , David I Watson 1
  1. Flinders University, Bedford Park, SA, Australia
  2. Surgery, Flinders Medical Centre, Bedford Park, SA, Australia

The epidemiology of esophageal adenocarcinoma demonstrates a strong gender bias with a sex ratio of 8-9:1 in favour of males. A potential explanation for this is that estrogen might protect against esophageal adenocarcinoma. Estrogen has previously been shown to stimulate apoptosis in esophageal squamous cancer cells. However, the effect of estrogen on esophageal adenocarcinoma cells has not been determined. We used immunoblotting analysis to determine the expression of estrogen receptors, cell adhesion marker E-cadherin and proliferation marker Ki-67 in cell lines derived from esophageal adenocarcinoma (OE-19, OE-33), and Barrett’s esophagus (QhTRT, ChTRT, GihTRT). Estrogen and selective estrogen receptor modulator (SERM) dependent effects on cell growth were determined by the CellTiter-96 Aqueous Proliferation Assay. Apoptosis was determined by Annexin V/Propidium Iodide cell labelling and flow cytometry. We detected that physiological and supra-physiological concentrations of 17beta-estradiol and selective estrogen receptor modulators (SERM) decreased cell growth in esophageal adenocarcinoma cells. In Barrett’s esophagus cells (QhTRT, ChTRT) decreased growth was detected in response to estrogen/SERM. The level of estrogen receptor expression in the cell lines correlated with the level of anti-growth effects induced by the receptor agonists. Flow cytometry analysis confirmed estrogen/SERM stimulated apoptosis in esophageal adenocarcinoma cells. Estrogen/SERM treatments were associated with a decrease in the expression of Ki-67 and an increase in E-cadherin expression in esophageal adenocarcinoma cells. This study suggests that esophageal adenocarcinoma and Barrett’s esophagus cells respond to treatment with selective estrogen receptor ligands, resulting in decreased cell growth and apoptosis. Further research to explore potential therapeutic applications is warranted.