Abstract
Chromosomal abnormalities in B-cell chronic lymphocytic leukemia (B-CLL) have been shown to correlate with prognosis. Little is known about the relationship between chromosomal abnormalities and biological behavior of B-CLL cells in vitro. The present study was designed to explore the impact of chromosomal abnormalities determined by interphase fluorescence in situ hybridization (FISH) on the in vitro survival and immunogenicity of B-CLL. Considerable heterogeneity was noted in the in vitro survival and expression of costimulatory, adhesion, and antigen-presenting molecules by B-CLL cells. Spontaneous apoptosis of B-CLL cells in vitro was significantly lower in samples with good prognosis cytogenetics when compared to samples with poor prognosis cytogenetics. In contrast, B-CLL cells from samples with good prognosis cytogenetics exhibited higher basal expression of molecules involved in costimulation, cellular adhesion, and antigen presentation, and induced significantly more T-cell proliferation in mixed lymphocyte cultures. We conclude that chromosomal aberrations of B-CLL cells correlate with the in vitro biological behavior of B-CLL. Our data indicate that good prognosis cytogenetics correlates with less spontaneous apoptosis but greater in vitro immunogenicity. These findings could have significant implications on the design of future therapeutic approaches in patients with CLL, and the likelihood of response based on cytogenetics.
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Acknowledgements
We thank Justin Fishbaugh and Gene Hess from the Holden Comprehensive Cancer Center Flow Cytometry Facility for excellent technical assistance and Dr Shiva Patil from the University of Iowa Cytogenetics Laboratory for generous support with the FISH analysis.
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Supported in part by American Cancer Society Grant IRG-77-004-25 administered through the Holden Comprehensive Cancer Center and National Institutes of Health Grants R01 CA77764 and P50 CA97274
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Supplementary Information accompanies the paper on the Leukemia website (http://www.nature.com/leu).
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Jahrsdörfer, B., Wooldridge, J., Blackwell, S. et al. Good prognosis cytogenetics in B-cell chronic lymphocytic leukemia is associated in vitro with low susceptibility to apoptosis and enhanced immunogenicity. Leukemia 19, 759–766 (2005). https://doi.org/10.1038/sj.leu.2403694
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DOI: https://doi.org/10.1038/sj.leu.2403694
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