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dc.contributor.authorGuest, Ryan D
dc.contributor.authorHawkins, Robert E
dc.contributor.authorKirillova, Natalia
dc.contributor.authorCheadle, Eleanor J
dc.contributor.authorArnold, Jennifer
dc.contributor.authorO'Neill, Alison C
dc.contributor.authorIrlam, Joely J
dc.contributor.authorChester, Kerry A
dc.contributor.authorKemshead, John T
dc.contributor.authorShaw, David M
dc.contributor.authorEmbleton, Jim
dc.contributor.authorStern, Peter L
dc.contributor.authorGilham, David E
dc.date.accessioned2009-07-24T15:20:44Z
dc.date.available2009-07-24T15:20:44Z
dc.date.issued2005
dc.identifier.citationThe role of extracellular spacer regions in the optimal design of chimeric immune receptors: evaluation of four different scFvs and antigens., 28 (3):203-11 J. Immunother.en
dc.identifier.issn1524-9557
dc.identifier.pmid15838376
dc.identifier.urihttp://hdl.handle.net/10541/75654
dc.description.abstractHuman peripheral blood lymphocytes can be transduced to express antigen-dependent CD3zeta chimeric immune receptors (CIRs), which function independently of the T-cell receptor (TCR). Although the exact function of these domains is unclear, previous studies imply that an extracellular spacer region is required for optimal CIR activity. In this study, four scFvs (in the context of CIRs with or without extracellular spacer regions) were used to target the human tumor-associated antigens carcinoembryonic antigen (CEA), neural cell adhesion molecule (NCAM), the oncofetal antigen 5T4, and the B-cell antigen CD19. In all cases human T-cell populations expressing the CIRs were functionally active against their respective targets, but the anti-5T4 and anti-NCAM CIRs showed enhanced specific cytokine release and cytotoxicity only when possessing an extracellular spacer region. In contrast, the anti-CEA and anti-CD19 CIRs displayed optimal cytokine release activity only in the absence of an extracellular spacer. Interestingly, mapping of the scFv epitopes has revealed that the anti-CEA scFv binds close to the amino-terminal of CEA, which is easily accessible to the CIR. In contrast, CIRs enhanced by a spacer domain appear to bind to epitopes residing closer to the cell membrane, suggesting that a more flexible extracellular domain may be required to permit the efficient binding of such epitopes. These results show that a spacer is not necessary for optimal activity of CIRs but that the optimal design varies.
dc.language.isoenen
dc.subject.meshAntigens, CD19
dc.subject.meshAntigens, CD3
dc.subject.meshAntigens, Neoplasm
dc.subject.meshCarcinoembryonic Antigen
dc.subject.meshExtracellular Space
dc.subject.meshHumans
dc.subject.meshImmunoglobulin Variable Region
dc.subject.meshMembrane Glycoproteins
dc.subject.meshNeural Cell Adhesion Molecules
dc.subject.meshProtein Structure, Tertiary
dc.subject.meshReceptors, Antigen, T-Cell
dc.subject.meshRecombinant Fusion Proteins
dc.subject.meshT-Lymphocytes
dc.subject.meshTransfection
dc.titleThe role of extracellular spacer regions in the optimal design of chimeric immune receptors: evaluation of four different scFvs and antigens.en
dc.typeArticleen
dc.contributor.departmentCancer Research UK, Department of Medical Oncology, University of Manchester and Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester M20 4BX, UK.en
dc.identifier.journalJournal of Immunotherapyen
html.description.abstractHuman peripheral blood lymphocytes can be transduced to express antigen-dependent CD3zeta chimeric immune receptors (CIRs), which function independently of the T-cell receptor (TCR). Although the exact function of these domains is unclear, previous studies imply that an extracellular spacer region is required for optimal CIR activity. In this study, four scFvs (in the context of CIRs with or without extracellular spacer regions) were used to target the human tumor-associated antigens carcinoembryonic antigen (CEA), neural cell adhesion molecule (NCAM), the oncofetal antigen 5T4, and the B-cell antigen CD19. In all cases human T-cell populations expressing the CIRs were functionally active against their respective targets, but the anti-5T4 and anti-NCAM CIRs showed enhanced specific cytokine release and cytotoxicity only when possessing an extracellular spacer region. In contrast, the anti-CEA and anti-CD19 CIRs displayed optimal cytokine release activity only in the absence of an extracellular spacer. Interestingly, mapping of the scFv epitopes has revealed that the anti-CEA scFv binds close to the amino-terminal of CEA, which is easily accessible to the CIR. In contrast, CIRs enhanced by a spacer domain appear to bind to epitopes residing closer to the cell membrane, suggesting that a more flexible extracellular domain may be required to permit the efficient binding of such epitopes. These results show that a spacer is not necessary for optimal activity of CIRs but that the optimal design varies.


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