Abstract
In conclusion, B-CLL cells through their immunophenotype have the functional potential required to interact with cells in what has been called the immunological synapse, i.e. the cognate interactions between T-cells, antigen-presenting cells and B-cells during immunopoiesis. The data reviewed herein provides substantial evidence to suggest that B-CLL cells in fact can interact, not only with T-cells but also with endothelial cells and stromal cells in the bone marrow. These interactions, in particular signaling through CD40, contribute to extended survival and proliferation of B-CLL cells and, thereby, the risk of complete malignant transformation of the clone. Therefore, this review would suggest that the answers to how B-CLL is initiated may be found in molecules responsible for the normal regulation of immunopoiesis. Transformation to malignancy, by contrast, is likely to be caused by loss of control over the G1 restriction in the cell cycle in B-CLL cells.
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