Antilymphoma Effects of Anti-HLA-DR and CD20 Monoclonal Antibodies (Lym-1 and Rituximab) on Human Lymphoma Cells
| Autor: | Sally J. DeNardo, Gerald L. DeNardo, Cathy Liu, Evan Tobin |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Cancer Research
Time Factors Lymphoma Cell Survival medicine.drug_class medicine.medical_treatment Blotting Western Antineoplastic Agents Apoptosis Monoclonal antibody Antibodies Monoclonal Murine-Derived Antigen immune system diseases Cell Line Tumor hemic and lymphatic diseases Leukocytes Humans Medicine Radiology Nuclear Medicine and imaging Cell Proliferation CD20 Pharmacology Dose-Response Relationship Drug biology Caspase 3 business.industry Antibodies Monoclonal Complement System Proteins HLA-DR Antigens Immunotherapy General Medicine Antigens CD20 medicine.disease Burkitt Lymphoma Enzyme Activation Oncology Caspases Radioimmunotherapy Immunology Monoclonal biology.protein Rituximab Lymphoma Large B-Cell Diffuse Poly(ADP-ribose) Polymerases business medicine.drug |
| Zdroj: | Cancer Biotherapy and Radiopharmaceuticals. 19:545-561 |
| ISSN: | 1084-9785 |
| DOI: | 10.1089/1084978042484849 |
| Popis: | Anti-HLA-DR and anti-CD20 monoclonal antibodies (MAbs) have been effective for immunotherapy and radioimmunotherapy in non-Hodgkin's lymphoma (NHL). The aim of our study was to compare the antilymphoma effects of Lym-1 and rituximab in human lymphoma cell lines, using assays of viability, apoptosis, antibody-dependent cellular cytotoxicity (ADCC), and complement-dependent cytotoxicity (CDC), under conditions relevant to the clinic.To characterize response relationships at varied concentrations of Lym-1 and rituximab, growth inhibition and cell death were assayed over 96 hours in four NHL cell lines derived from Burkitt's or large-cell lymphoma patients. Untreated cells and cells treated with an mLym-1 isotype-matched MAb were used as negative controls for direct assays. Western blot was used to detect apoptosis through the activation of caspase-3 and cleavage of poly (ADP-ribase) polymerase (PARP). The indirect cytotoxicity of Lym-1 and rituximab was assayed at varied concentrations, using ADCC activity in the presence of purified peripheral blood leukocytes and CDC activity in the presence of human donor serum.Lym-1 and rituximab showed significant direct and indirect antilymphoma effects. Lym-1 had a substantial, and statistically greater, effect than rituximab over longer intervals of time. In Raji and B35M cells, Lym-1 induced potent growth inhibition reflected by 90% and 94% reductions in viable cells, respectively, whereas rituximab induced 63% and 56% reductions. Concurrently, Lym-1 increased nonviable cells by 372% and 153% in these cells, respectively, whereas rituximab induced 139% and 43% increases. Lym-1-induced apoptosis was greater than that of rituximab in all cell lines tested. Lym-1, both the chimeric form and the mouse parent, mediate ADCC more effectively, in the presence of a total peripheral blood leukocyte (PBL) population, than does rituximab, although the results for CDC activity were mixed.In conclusion, Lym-1 had more potent direct and indirect cytotoxic effects than rituximab in lymphoma cells under conditions achievable in patients. Because the HLA-DR target antigen of Lym-1 is enriched on most B-cell lymphomas, these results support its complementary use in patients as an alternative to CD20 for monoimmunotherapy and for combination immunotherapy with rituximab, because the HLA-DR and CD20 antigens are physically and functionally coupled on human B cells. |
| Databáze: | OpenAIRE |
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