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[The significance of Fas/FasL molecular system in breast cancer]
Corina Cianga1, P Cianga, Laurette Cozma
1Universitatea de Medicină şi Farmacie Gr.T. Popa Iaşi, Facultatea de Medicină Stomatologică, Disciplina Imunologie.
Abstract:
Fas (CD95/APO-1) and its natural ligand, FasL, are molecules expressed on cellular membranes, being involved in the induction of programmed cells death or apoptosis. Recently, it has been shown that malignant cells originating from solid tumors tend to inhibit the expression of Fas, as an escape mechanism from the immune cells' attack and to express FasL, as a counterstrike mechanism against the immune effector cells. The purpose of this study was to investigate, by immunohistochemistry, the presence of Fas and FasL in 15 breast carcinomas and to establish possible associations between the expression of these molecules and the histological type and grading of the tumors. Our results showed that 7 breast tumors have lost the expression of Fas and 11 tumors were positive for the Fas-ligand expression, important arguments for the mechanisms of immune escape and tolerance induction. Furthermore, 7 of the 11 FasL+ tumors were poorly differentiated invasive ductal carcinomas, suggesting a possible association between FasL expression and tumor aggressivity.
Insights
Breast cancer cells can evade immune detection by downregulating Fas and upregulating Fas ligand (FasL). This study found Fas loss and FasL expression in most tumors, particularly aggressive types, suggesting immune evasion mechanisms in breast cancer.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Fas (CD95/APO-1) and Fas ligand (FasL) mediate apoptosis.
- Malignant cells may downregulate Fas and upregulate FasL for immune evasion.
- This study investigates Fas and FasL expression in breast carcinomas.
Purpose of the Study:
- To examine the expression of Fas and FasL in breast carcinomas using immunohistochemistry.
- To correlate Fas and FasL expression with histological type and tumor grade.
Main Methods:
- Immunohistochemistry was employed to detect Fas and FasL.
- The study analyzed 15 breast carcinoma samples.
Main Results:
- Seven out of 15 breast tumors showed a loss of Fas expression.
- Eleven tumors were positive for FasL expression.
- Seven of the FasL-positive tumors were poorly differentiated invasive ductal carcinomas.
Conclusions:
- Loss of Fas and expression of FasL are observed in breast carcinomas, supporting immune escape mechanisms.
- FasL expression may be associated with increased tumor aggressiveness in invasive ductal carcinomas.
