Basal Ca(2+) signaling is particularly increased in mutated chronic lymphocytic leukemia.
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| Abstract |
On the basis of somatic hypermutation status of their B-cell antigen receptor (BCR) genes, chronic lymphocytic leukemia (CLL) patients can be divided into unmutated CLL (U-CLL) or mutated CLL (M-CLL). Approximately 30% of CLL patients express a stereotypic BCR, which may indicate that specific antigenic stimulation is driving CLL pathogenesis. Recently, it was reported that BCRs from CLL cells are capable of antigen-independent, cell-autonomous signaling, through recognition of an internal framework 2 (FR2) BCR epitope. We hypothesized that the level of cell-autonomous signaling may differ between CLL subgroups. Therefore, we analyzed Ca(2+) signaling in a series of primary stereotypic or heterogeneous U-CLL and M-CLL (n=68) and healthy controls (n=14). We confirmed that basal Ca(2+) signaling in CLL cells is higher than in normal B cells. Interestingly, we found that basal signaling was particularly increased in M-CLL. The degree of basal signaling did not correlate with membrane immunoglobulin levels, HCDR3 characteristics or FR2/FR3 sequence. We conclude that the level of basal Ca(2+) signaling is not uniformly enhanced in CLL B cells, but is associated with CLL immunoglobulin heavy chain V mutational status, reflecting a distinct cellular origin and possibly a different anergic state induced by repetitive or continuous antigen binding in vivo.
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| Authors | A F Muggen, S Y Pillai, L P Kil, M C van Zelm, J J M van Dongen, R W Hendriks, A W Langerak |
| Journal | Leukemia (Leukemia) Vol. 29 Issue 2 Pg. 321-8 (Feb 2015) ISSN: 1476-5551 [Electronic] England |
| PMID | 24917358 (Publication Type: Journal Article) |
| Chemical References |
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