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Staphylococcus aureus Cowan Strain 1 Activation of B‐Chronic Lymphocytic Leukaemia Cells Augments the Response to CD40 Stimulation
Author(s) -
Ola Söderberg,
Ulf Thunberg,
Cecilia Weigelt,
Ilse Christiansen,
Thomas H. Tötterman,
Mats Carlsson,
Johan Sällström,
Kenneth Nilsson
Publication year - 1999
Publication title -
scandinavian journal of immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.934
H-Index - 88
eISSN - 1365-3083
pISSN - 0300-9475
DOI - 10.1046/j.1365-3083.1999.00604.x
Subject(s) - cd40 , biology , stimulation , chronic lymphocytic leukemia , immunology , immune system , monoclonal antibody , cell growth , b cell , microbiology and biotechnology , antibody , cytotoxic t cell , cancer research , leukemia , in vitro , endocrinology , biochemistry , genetics
The signals involved in regulating the proliferation, differentiation and survival of B‐chronic lymphocytic leukemia (B‐CLL) cells are fully understood. B‐CLL cells have been found to respond poorly to various activation signals and only after successful Epstein–Barr virus (EBV) transformation has it been possible to maintain such cells in long‐term cultures. In this work we describe a new method to activate and induce proliferation in B‐CLL cells and to maintain such cells in long‐term culture for longer than 1 month. We used a combination of protocols in an attempt to mimic some of the signals of a thymus‐dependent immune response. The B‐CLL cells were first activated with Staphylococcus aureus Cowan strain 1 (SAC) particles plus thioredoxin (Trx), followed by stimulation with interleukin (IL)‐2 + Trx. This treatment primed the cells for further stimulation with anti‐CD40 monoclonal antibody (MoAb) presented on irradiated CD32L cells (the CD40‐system) or soluble CD40 Ligand, and a combination of Trx and cytokines (IL‐4 + IL‐10), which allowed the cells to be maintained for up to 1 month with preserved viability and a variable rate of proliferation. However, induced proliferation of the B‐CLL cells was limited to ≈ 1 month, suggesting that additional signals are required to facilitate further proliferation.