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Leukemia. 2016 May;30(5):1062-70. doi: 10.1038/leu.2015.357. Epub 2015 Dec 31.

Recurrent activating mutations of CD28 in peripheral T-cell lymphomas.

Author information

1
Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA.
2
Department of Pathology, City of Hope National Medical Center, Duarte, CA, USA.
3
Department of Pathology, Xi Jing Hospital, Fourth Military Medical University, Xi'an, Shaan Xi Province, China.
4
Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
5
Internal Medicine Residency Program, Florida Atlantic University College of Medicine, Boca Raton, FL, USA.
6
School of Medicine, Shandong University, Jinan, China.
7
Department for Lymphoid Cancer Research, Centre for Lymphoid Cancer, BC Cancer Agency, Vancouver, BC, Canada.
8
Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada.
9
Institute of Pathology and Comprehensive Cancer Center Mainfranken (CCC MF), University of Wuerzburg, Wuerzburg, Germany.
10
Department of Medicine, University of Nebraska Medical Center, Omaha, NE, USA.
11
National Institutes of Health, Bethesda, MD, USA.
12
Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, Food and Drug Administration, Washington, DC, USA.
13
Eppley Institute for Cancer Research and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA.

Abstract

Peripheral T-cell lymphomas (PTCLs) comprise a heterogeneous group of mature T-cell neoplasms with a poor prognosis. Recently, mutations in TET2 and other epigenetic modifiers as well as RHOA have been identified in these diseases, particularly in angioimmunoblastic T-cell lymphoma (AITL). CD28 is the major co-stimulatory receptor in T cells which, upon binding ligand, induces sustained T-cell proliferation and cytokine production when combined with T-cell receptor stimulation. We have identified recurrent mutations in CD28 in PTCLs. Two residues-D124 and T195-were recurrently mutated in 11.3% of cases of AITL and in one case of PTCL, not otherwise specified (PTCL-NOS). Surface plasmon resonance analysis of mutations at these residues with predicted differential partner interactions showed increased affinity for ligand CD86 (residue D124) and increased affinity for intracellular adaptor proteins GRB2 and GADS/GRAP2 (residue T195). Molecular modeling studies on each of these mutations suggested how these mutants result in increased affinities. We found increased transcription of the CD28-responsive genes CD226 and TNFA in cells expressing the T195P mutant in response to CD3 and CD86 co-stimulation and increased downstream activation of NF-κB by both D124V and T195P mutants, suggesting a potential therapeutic target in CD28-mutated PTCLs.

PMID:
26719098
PMCID:
PMC5688878
DOI:
10.1038/leu.2015.357
[Indexed for MEDLINE]
Free PMC Article

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