Related Experiment Videos
Oestrogen receptors and microsatellite instability in colorectal carcinoma patients
M Notarnicola1, R Gristina, C Messa
1Laboratory of Biochemistry, IRCCS Scientific Institute for Digestive Diseases S. de Bellis, Via della Resistenza, 70013 (BA), Castellana G., Italy.
Abstract:
About 10-15% of sporadic colorectal cancers show microsatellite instability (MIN), a mutator phenotype of mismatch repair genes. It seems that oestrogens may inhibit the pathway to colorectal carcinoma which involves a mismatch repair deficiency. Oestrogen receptorial status was evaluated in the neoplastic tissue and uninvolved surrounding mucosa of 17 MIN-positive and 33 MIN-negative tumours using an immunoenzymatic assay. MIN status was examined using the polymerase chain reaction and specific microsatellite markers. MIN was significantly associated with very low levels of oestrogen receptor in tumour tissue. Our findings suggest that MIN-positive tumours might lose a possible oestrogenic modulation mechanism.
Insights
Microsatellite instability (MIN) in colorectal cancer is linked to low estrogen receptor levels. This suggests MIN-positive tumors may lack estrogen
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Sporadic colorectal cancers (CRCs) exhibit microsatellite instability (MIN) in 10-15% of cases, indicating a mismatch repair gene defect.
- Estrogens may play a protective role against colorectal carcinoma development, particularly in pathways involving mismatch repair deficiency.
Purpose of the Study:
- To investigate the association between microsatellite instability (MIN) status and estrogen receptor (ER) expression in colorectal tumor tissues.
- To explore whether MIN-positive colorectal tumors exhibit altered ER status compared to MIN-negative tumors.
Main Methods:
- Evaluated estrogen receptor status in neoplastic and surrounding mucosal tissues from 17 MIN-positive and 33 MIN-negative colorectal tumors using an immunoenzymatic assay.
- Determined MIN status through polymerase chain reaction (PCR) analysis with specific microsatellite markers.
Main Results:
- A significant inverse correlation was observed between MIN status and estrogen receptor levels in colorectal tumor tissue.
- MIN-positive tumors were characterized by markedly lower levels of estrogen receptor expression compared to MIN-negative tumors.
Conclusions:
- Microsatellite instability in colorectal cancer is strongly associated with very low estrogen receptor expression.
- MIN-positive colorectal tumors may have lost a crucial mechanism of estrogen-mediated modulation, potentially impacting tumor development or progression.