The Programmed Death-1 Receptor, Programmed Death-1 Ligand (PD-1/PD-L1) and Apoptosis in Breast Cancer Patients: A potential Mechanism of Immune Escape | ||||
| Egyptian Journal of Cancer and Biomedical Research | ||||
| Article 5, Volume 4, Issue 2, August 2020, Page 107-120 PDF (1.06 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jcbr.2020.29939.1038 | ||||
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| Authors | ||||
Samar Abdel-hamied1; Heba Elsheredy   2; Gylan Fadali3; Amal Mansour4; Amina Hussein5
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| 1Faculty of Science, Elminia University, Egypt | ||||
| 2Department of Cancer Management and Research, Medical Research Institute, Alexandria University, Alexandria, Egypt | ||||
| 3Department of Pathology, Medical Research Institute, Alexandria University, Alexandria, Egypt | ||||
| 4Department of Clinical Pathology, Faculty of medicine, Alexandria University, Alexandria, Egypt | ||||
| 5Department of immunology and Allergy, Medical Research Institute, Alexandria University, Alexandria, Egypt | ||||
| Abstract | ||||
| Background: Interaction between programmed cell death ligand-1 (PD-L1) and its receptor PD-1 is a major inhibitory pathway in maintaining an immunosuppressive tumor microenvironment. The expression of PD-L1 in various solid tumors is proposed to function in preventing T-cell mediated tumor killing and activating tumor-suppressive cell populations through different mechanisms. B-cell Lymphoma-2 (Bcl-2) is a key anti-apoptotic protein that has been described as a mediator of cancer progression. The expression of PD-L1 on the activated T-cells supports their survival. Objectives:Evaluate the expression of PD-1, PD-L1 in relation to apoptosis among patients with breast cancer. PD-1, PD-L1 and Bcl-2 l were correlated with each other and with the clinicopathological features of the disease. Patients and Methods: This study was conducted on 55 breast cancer patients with different stages of the disease.20 healthy individuals were included as a control group. Patient groups were divided into an early and advanced-stage of the disease. The percentage of PD-1 and PDL-1 were measured in blood samples using flowcytometry. Quantitative detection of Bcl-2 protein was assessed using an enzyme linked immunosorbent assay. Results: PD-L1 expression was significantly associated with tumor grade, lymph node involvement, tumor size, vascular invasion and hormonal receptors. PD-1 positivity was significantly associated with lymph node involvement. A significant negative correlation was found between serum Bcl-2 and early-stage and lymph node involvement. However, a significant positive correlation existed between serum Bcl-2 and PD-L1+. Conclusions: The correlation between PD-L1+ expression and serum Bcl-2 concentration may highlight the role of apoptotic machinery in the pathogenesis of breast cancer. | ||||
| Keywords | ||||
| Apoptosis; breast cancer; immune escape | ||||
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