Effects of preactivated autologous T lymphocytes on CD80, CD86 and CD95 expression by chronic lymphocytic leukemia B cells
| Autor: | Giacomo Lucivero, Bruno Rotoli, Ciro Romano, Riccardo Giunta, Liliana Dalla Mora, Federico Chiurazzi, Ausilia Sellitto, Umberto De Fanis |
|---|---|
| Přispěvatelé: | Romano, Ciro Pasquale, DE FANIS, U, Sellitto, A, DALLA MORA, Liliana, Chiurazzi, F, Giunta, Riccardo, Rotoli, B, Lucivero, Giacomo |
| Rok vydání: | 2004 |
| Předmět: |
Male
Cancer Research T cell Chronic lymphocytic leukemia T-Lymphocytes CD40 Ligand chemical and pharmacologic phenomena Apoptosis Biology Lymphocyte Activation Immunophenotyping Immune system immune system diseases Antigens CD hemic and lymphatic diseases medicine Humans fas Receptor B cell Aged CD86 Aged 80 and over B-Lymphocytes CD40 Membrane Glycoproteins Ionomycin Germinal center Hematology Middle Aged medicine.disease Leukemia Lymphocytic Chronic B-Cell Coculture Techniques Up-Regulation medicine.anatomical_structure Oncology Immunology Cancer research biology.protein B7-1 Antigen Tetradecanoylphorbol Acetate Female B7-2 Antigen CD80 |
| Zdroj: | Leukemialymphoma. 44(11) |
| ISSN: | 1042-8194 |
| Popis: | Profound immune dysfunction is a constant feature in B-cell chronic lymphocytic leukemia (B-CLL) patients. Immunological abnormalities include hypogammaglobulinemia, impaired immunoglobulin class switching and diminished germinal center formation. This state of immune suppression renders B-CLL patients highly susceptible to infections, which contribute greatly to morbidity and mortality in this disease. Impaired T cell function in B-CLL is well-documented and has been suggested to result from inhibitory effects exerted by malignant B lymphocytes. Because the presence of leukemic cells may represent a major obstacle to efficient T cell activation, T lymphocytes were separated from CLL B cells, stimulated with phorbol 12-myristate 13-acetate (PMA) and ionomycin for 4h, and then cocultured with autologous leukemic B cells both at a 1:1 ratio or at the same ratio as in vivo for 24-40 h. CLL B cell expression of CD86 and CD95 was markedly upregulated using this approach, whereas CD80 expression was augmented only in a minority of patients; these effects were partially preserved even when preactivated T cells were rechallenged with CLL B cells at the same low T/B cell ratio as that observed in vivo. Finally, CD80 upregulation on CLL B cells appeared to be mainly dependent on CD40L-mediated stimulation, whereas CD86 and CD95 expression was efficiently augmented by soluble factors released by preactivated T lymphocytes. In conclusion, efficient activation of T lymphocytes in B-CLL may be achieved which, in turn, may result in enhanced antigen-presenting capacity and susceptibility to apoptosis of leukemic cells via CD86 and CD95 upregulation, respectively. |
| Databáze: | OpenAIRE |
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