1. T cells from indolent CLL patients prevent apoptosis of leukemic B cells in vitro and have altered gene expression profile.
- Author
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Kiaii, Shahryar, Kokhaei, Parviz, Mozaffari, Fariba, Rossmann, Eva, Pak, Fatemeh, Moshfegh, Ali, Palma, Marzia, Hansson, Lotta, Mashayekhi, Kaveh, Hojjat-Farsangi, Mohammad, Österborg, Anders, Choudhury, Aniruddha, and Mellstedt, Håkan
- Subjects
T cells ,APOPTOSIS ,CHRONIC lymphocytic leukemia ,GENE expression ,CULTURES (Biology) ,INTERLEUKIN-4 ,PATIENTS - Abstract
T cells may have a role in sustaining the leukemic clone in chronic lymphocytic leukemia (CLL). In this study, we have examined the ability of T cells from CLL patients to support the survival of the leukemic B cells in vitro. Additionally, we compared global gene expression of T cells from indolent CLL patients with healthy individuals and multiple myeloma (MM) patients. Apoptosis of purified leukemic B cells was inhibited in vitro when co-cultured with increasing numbers of autologous T cells ( p < 0.01) but not autologous B and T cells of normal donors. The anti-apoptotic effect exceeded that of the anti-apoptotic cytokine IL-4 ( p = 0.002) and was greater with CD8+ cells ( p = 0.02) than with CD4+ cells ( p = 0.05). The effect was depended mainly on cell-cell contact although a significant effect was also observed in transwell experiments ( p = 0.05). About 356 genes involved in different cellular pathways were deregulated in T cells of CLL patients compared to healthy individuals and MM patients. The results of gene expression profiling were verified for 6 genes (CCL4, CCL5 (RANTES), XCL1, XCL2, KLF6, and TRAF1) using qRT-PCR and immunoblotting. Our results demonstrate that CLL-derived T cells can prevent apoptosis of leukemic B cells and have altered expression of genes that may facilitate the survival of the leukemic clone. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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