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B-CLL

Role of B-cell antigen receptor-associated molecules and lipid rafts in CD5-induced apoptosis of B CLL cells

Leukemia volume 19, pages 223–229 (2005)Cite this article

Abstract

A total of 40 patients with B-CLL were investigated for CD5-triggered apoptosis and categorized as 20 resistant (group I) and 20 sensitive patients (group II). The densities of surface IgM (sIgM) and CD5 were lower in group I than group II, as were the percentages of CD79b+, CD38+, and Zap70-expressing B cells. CD5 signaling was mediated through the BCR in group II B cells, as established by coimmunoprecipitation of CD5 and CD79a and tyrosine phosphorylation of CD79a. Following colocalization of CD5 and sIgM in membrane lipid rafts (LRs), Syk became associated with these molecules, whereas SHP-1 was uncoupled from CD5. Nonresponsiveness to CD5 cross-linking in group I was ascribed to three possible abnormalities, and defined as three subgroups of patients. In subgroups Ia and Ib, CD5 and sIgM colocalized within the LRs. SHP-1 remained attached to the BCR in subgroup Ia, but not in subgroup Ib, where signal transduction was associated with an excess of truncated CD79b. In subgroup Ic, CD5 and sIgM segregated into different LRs, resulting in no signaling of apoptosis.

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Acknowledgements

This study was supported by the Académie Nationale Française de Médecine, the Conseil Régional de Bretagne, and the Communauté Urbaine de Brest, France. We thank Professor P Beverley, London, UK for providing reagents, and appreciate the secretarial assistance of C Séné and S Forest.

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Authors and Affiliations

  1. Laboratory of Immunology, Brest University Medical School, Brest, France

    Y Renaudineau, S Nédellec, P Youinou & J-O Pers

  2. Department of Hematology, Brest University Medical School, Brest, France

    C Berthou

  3. Department of Immunology and Molecular Pathology, Royal Free and University College Medical School, London, UK

    P M Lydyard

Authors
  1. Y Renaudineau
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  2. S Nédellec
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  3. C Berthou
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  4. P M Lydyard
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  5. P Youinou
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  6. J-O Pers
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Corresponding author

Correspondence to P Youinou.

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Supplementary Information accompanies the paper on the Leukemia website (http://www.nature.com/leu).

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Renaudineau, Y., Nédellec, S., Berthou, C. et al. Role of B-cell antigen receptor-associated molecules and lipid rafts in CD5-induced apoptosis of B CLL cells. Leukemia 19, 223–229 (2005). https://doi.org/10.1038/sj.leu.2403601

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