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von Wenserski L, Schultheiß C, Bolz S, Schliffke S, Simnica D, Willscher E, Gerull H, Wolters-Eisfeld G, Riecken K, Fehse B, Altfeld M, Nollau P, Binder M. SLAMF receptors negatively regulate B cell receptor signaling in chronic lymphocytic leukemia via recruitment of prohibitin-2. Leukemia 2020; 35:1073-1086. [PMID: 32826957 PMCID: PMC8024197 DOI: 10.1038/s41375-020-01025-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 07/30/2020] [Accepted: 08/07/2020] [Indexed: 01/25/2023]
Abstract
We identified a subset of Chronic Lymphocytic Leukemia (CLL) patients with high Signaling Lymphocytic Activation Molecule Family (SLAMF) receptor-related signaling that showed an indolent clinical course. Since SLAMF receptors play a role in NK cell biology, we reasoned that these receptors may impact NK cell-mediated CLL immunity. Indeed, our experiments showed significantly decreased degranulation capacity of primary NK cells from CLL patients expressing low levels of SLAMF1 and SLAMF7. Since the SLAMFlow signature was strongly associated with an unmutated CLL immunoglobulin heavy chain (IGHV) status in large datasets, we investigated the impact of SLAMF1 and SLAMF7 on the B cell receptor (BCR) signaling axis. Overexpression of SLAMF1 or SLAMF7 in IGHV mutated CLL cell models resulted in reduced proliferation and impaired responses to BCR ligation, whereas the knockout of both receptors showed opposing effects and increased sensitivity toward inhibition of components of the BCR pathway. Detailed molecular analyzes showed that SLAMF1 and SLAMF7 receptors mediate their BCR pathway antagonistic effects via recruitment of prohibitin-2 (PHB2) thereby impairing its role in signal transduction downstream the IGHV-mutant IgM-BCR. Together, our data indicate that SLAMF receptors are important modulators of the BCR signaling axis and may improve immune control in CLL by interference with NK cells.
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Affiliation(s)
- Lisa von Wenserski
- Department of Internal Medicine IV Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle, Saale, Germany
| | - Christoph Schultheiß
- Department of Internal Medicine IV Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle, Saale, Germany
| | - Sarah Bolz
- TU Dresden, Biotechnologisches Zentrum, Dresden, Germany
| | - Simon Schliffke
- Department of Oncology and Hematology, Bone Marrow Transplantation with Section Pneumology, Hubertus Wald Tumorzentrum-University Cancer Center Hamburg, Hamburg, Germany
| | - Donjete Simnica
- Department of Internal Medicine IV Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle, Saale, Germany
| | - Edith Willscher
- Department of Internal Medicine IV Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle, Saale, Germany
| | - Helwe Gerull
- Research Institute Children's Cancer Center and Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Gerrit Wolters-Eisfeld
- Research Institute Children's Cancer Center and Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kristoffer Riecken
- Research Department Cell and Gene Therapy, Department of Stem Cell Transplantation, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Boris Fehse
- Research Department Cell and Gene Therapy, Department of Stem Cell Transplantation, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Marcus Altfeld
- Research Department Virus Immunology, Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Peter Nollau
- Research Institute Children's Cancer Center and Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Mascha Binder
- Department of Internal Medicine IV Oncology/Hematology, Martin-Luther-University Halle-Wittenberg, Halle, Saale, Germany.
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Pal Singh S, de Bruijn MJW, Velaso Gago da Graça C, Corneth OBJ, Rip J, Stadhouders R, Meijers RWJ, Schurmans S, Kerr WG, Ter Burg J, Eldering E, Langerak AW, Pillai SY, Hendriks RW. Overexpression of SH2-Containing Inositol Phosphatase Contributes to Chronic Lymphocytic Leukemia Survival. THE JOURNAL OF IMMUNOLOGY 2019; 204:360-374. [PMID: 31836657 DOI: 10.4049/jimmunol.1900153] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 11/11/2019] [Indexed: 01/01/2023]
Abstract
Balanced activity of kinases and phosphatases downstream of the BCR is essential for B cell differentiation and function and is disturbed in chronic lymphocytic leukemia (CLL). In this study, we employed IgH.TEμ mice, which spontaneously develop CLL, and stable EMC CLL cell lines derived from these mice to explore the role of phosphatases in CLL. Genome-wide expression profiling comparing IgH.TEμ CLL cells with wild-type splenic B cells identified 96 differentially expressed phosphatase genes, including SH2-containing inositol phosphatase (Ship2). We found that B cell-specific deletion of Ship2, but not of its close homolog Ship1, significantly reduced CLL formation in IgH.TEμ mice. Treatment of EMC cell lines with Ship1/2 small molecule inhibitors resulted in the induction of caspase-dependent apoptosis. Using flow cytometry and Western blot analysis, we observed that blocking Ship1/2 abrogated EMC cell survival by exerting dual effects on the BCR signaling cascade. On one hand, specific Ship1 inhibition enhanced calcium signaling and thereby abrogated an anergic response to BCR stimulation in CLL cells. On the other hand, concomitant Ship1/Ship2 inhibition or specific Ship2 inhibition reduced constitutive activation of the mTORC1/ribosomal protein S6 pathway and downregulated constitutive expression of the antiapoptotic protein Mcl-1, in both EMC cell lines and primary IgH.TEμ CLL cells. Importantly, also in human CLL, we found overexpression of many phosphatases including SHIP2. Inhibition of SHIP1/SHIP2 reduced cellular survival and S6 phosphorylation and enhanced basal calcium levels in human CLL cells. Taken together, we provide evidence that SHIP2 contributes to CLL pathogenesis in mouse and human CLL.
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Affiliation(s)
- Simar Pal Singh
- Department of Pulmonary Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands.,Department of Immunology, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands.,Postgraduate School Molecular Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | | | | | - Odilia B J Corneth
- Department of Pulmonary Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | - Jasper Rip
- Department of Pulmonary Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | - Ralph Stadhouders
- Department of Pulmonary Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands.,Department of Cell Biology, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | - Ruud W J Meijers
- Department of Immunology, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | - Stéphane Schurmans
- Laboratoire de Génétique Fonctionnelle, GIGA-Research Centre, Université de Liège, 4000 Liège, Belgium
| | - William G Kerr
- Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, NY 13210; and
| | - Johanna Ter Burg
- Department of Experimental Immunology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - Eric Eldering
- Department of Experimental Immunology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - Anton W Langerak
- Department of Immunology, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | - Saravanan Y Pillai
- Department of Pulmonary Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands
| | - Rudi W Hendriks
- Department of Pulmonary Medicine, Erasmus MC, NL 3000 CA Rotterdam, the Netherlands;
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