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题目:: Direct cellular interaction with activated CD4(+) T cells overcomes hyporesponsiveness of B-cell chronic lymphocytic leukemia in vitro.
作者:: Tretter(T),Schuler(M),Schneller(F),Brass(U),Esswein(M),Aman(M J),Huber(C),Peschel(C)
状态:: 发布时间1998-12-14 , 更新时间 2007-11-15
期刊:: Cell Immunol
摘要:: The proliferative response of clonal B cells from patients with chronic lymphocytic leukemia (B-CLL) is drastically reduced compared to normal B lymphocytes stimulated via the B cell antigen receptor complex or by CD40 ligation. In the present study we demonstrate that hyporesponsiveness of CLL-B cells can be overcome by stimulatory pathways mediated by activated CD4(+) T cells. In contrast to CD40 ligation, costimulation with activated T cells promotes a proliferative response in CLL-B cells identical to that in normal B cells. Furthermore, coculture with activated T cells improved survival of CLL-B cells in vitro. Differentiation of CLL-B cells into IgM producing cells was promoted, as well. However, the capacity for IgM secretion remained impaired compared to that of normal B cells. For T-cell-mediated B cell activation direct cellular contact with activated T helper cells is absolutely required. Prevention of CD40/CD40L interaction by CD40 antibody caused only partial inhibition of B cell activation, suggesting that additional signals are involved in T-B cell interaction. Whereas interruption of the ligand pairs CD11a/CD54, CD5/CD72, CD27/CD70 had no influence, the addition of CD58 antibody completely inhibited B cell activation by activated T cells. In costimulation with cellular signals the presence of B-cell-tropic cytokines, such as IL-2 and IL-4, was required to optimize B-CLL proliferation, as demonstrated by the use of neutralizing antibodies. We conclude from these results that proliferative hyporesponsiveness by CLL-B cells can be circumvented by antigen-nonspecific signals in addition to CD40 which are mediated by direct contact with activated T helper cells.
语言:: eng
DOI:: 10.1006/cimm.1998.1360

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