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Oxytocin receptor within the breast: biological function and distribution
A Sapino1, P Cassoni, A Stella
1Department of Biomedical Sciences and Oncology, University of Torino, Italy.
Anticancer Research
|August 15, 1998
Summary
Oxytocin (OT) effectively inhibits breast cancer cell proliferation and tumor growth by interacting with its specific receptors (OTR). OTR expression in breast cancer correlates with progesterone but not other common tumor markers.
Area of Science:
- Endocrinology
- Oncology
- Molecular Biology
Background:
- Oxytocin (OT) has demonstrated antiproliferative effects in previous studies.
- The presence and role of oxytocin receptors (OTR) in breast cancer require further elucidation.
Purpose of the Study:
- To investigate the antiproliferative effects of oxytocin (OT) on breast cancer cell lines in vitro and in vivo.
- To determine the expression of oxytocin receptors (OTR) in normal and cancerous breast tissues and correlate it with clinical parameters.
Main Methods:
- In vitro proliferation assays using MDA-MB231 and TS/A cell lines treated with OT.
- In vivo studies assessing the effect of OT on TS/A mammary tumor growth.
- Immunohistochemistry and RT-PCR to detect OTR and OTR mRNA in breast tissues.
Main Results:
- Oxytocin (10 nM and 100 nM) significantly inhibited proliferation in both human (MDA-MB231) and mouse (TS/A) breast cancer cell lines.
- Oxytocin treatment significantly reduced the growth of TS/A mammary tumors in vivo.
- OTR and OTR mRNA were detected in normal and pathological breast tissues, with no correlation to patient age, tumor stage, estrogen receptor status, or oncogene expression.
- A positive correlation was observed between progesterone receptor expression and OTR expression in breast carcinomas.
Conclusions:
- Oxytocin exhibits direct antiproliferative effects on breast cancer cells and reduces tumor growth, mediated by OTR.
- OTR is present in breast tissue, and its expression is linked to progesterone receptor status, suggesting a potential role in breast cancer progression.