title: Butyrophilin 3A (BTN3A, CD277)-specific antibody 20.1 differentially activates Vγ9Vδ2 TCR clonotypes and interferes with phosphoantigen activation.
abstract: Phosphoantigens (PAgs)-like HMBPP ((E)-4-hydroxy-3-methyl-but-2-enyl diphosphate) and butyrophilin 3 (BTN3A, CD277)-specific monoclonal antibody 20.1 induce TCR-mediated activation of Vγ9Vδ2 T cells. Here, we compared murine reporter cells transduced with Vγ9Vδ2 TCRs G115, D1C55, and MOP for the activation in culture with human RAJI cells and PAgs or mAb 20.1 and its single-chain (sc) derivative. All transductants responded readily to PAg but only TCR MOP γ-chain-expressing cells responded to mAb/sc 20.1. Furthermore, both antagonist and agonist mAb and sc of the agonist mAb inhibited the PAg response of TCR-transduced murine reporter cells. These findings suggest that, in contrast to stimulation by physiological stimulators (PAg), the responsiveness to mAb 20.1 depends strongly on CDR3 sequences of the TCR, and that mAb 20.1 can interfere with the PAg-response. Mouse or human origin of reporter cells might affect the mAb 20.1 response since all three TCR-mediated mAb 20.1-induced activation of TCR-transduced Jurkat cells. The pronounced differences between PAg and mAb 20.1-induced activation observed here help to understand the often contradictory published data. This study provides novel perspectives on the physiological mechanism of Vγ9Vδ2 T-cell activation, and highlights the complex mode of action of BTN3A-specific antibodies as agents in cancer immunotherapy.
authors.affiliation: Institute for Virology and Immunbiology, University of Würzburg, Würzburg, Germany.
authors.forename: Lisa
authors.initials: L
authors.lastname: Starick
authors.affiliation: Institute for Virology and Immunbiology, University of Würzburg, Würzburg, Germany.
authors.forename: Felipe
authors.initials: F
authors.lastname: Riano
authors.affiliation: Institute for Virology and Immunbiology, University of Würzburg, Würzburg, Germany.
authors.forename: Mohindar M
authors.initials: MM
authors.lastname: Karunakaran
authors.affiliation: Medical Clinic and Policlinic II, University of Würzburg, Würzburg, Germany.
authors.forename: Volker
authors.initials: V
authors.lastname: Kunzmann
authors.affiliation: Institute for Virology and Immunbiology, University of Würzburg, Würzburg, Germany.
authors.forename: Jianqiang
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute for Virology and Immunbiology, University of Würzburg, Würzburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Kreiss
authors.affiliation: Institute of Organic Chemistry, University of Regensburg, Regensburg, Germany.
authors.forename: Sabine
authors.initials: S
authors.lastname: Amslinger
authors.affiliation: CRCINA, INSERM, CNRS, Université d'Angers, Université de Nantes, Nantes, France.|Labex IGO "Immunotherapy, Graft, Oncology", Nantes, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Scotet
authors.affiliation: Centre de recherche en Cancérologie de Marseille, Inserm U1068 / CNRS U7258, Aix Marseille Université.|Institut Paoli-Calmettes, Marseille, France.
authors.forename: Daniel
authors.initials: D
authors.lastname: Olive
authors.affiliation: Experimental Immunology, University of Basel, Basel, Switzerland.
authors.forename: Gennaro
authors.initials: G
authors.lastname: De Libero
authors.affiliation: Institute for Virology and Immunbiology, University of Würzburg, Würzburg, Germany.
authors.forename: Thomas
authors.identifier: 0000-0002-1093-0194
authors.initials: T
authors.lastname: Herrmann
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D015703:Antigens, CD / Q000276:immunology*; D000071797:Butyrophilins / Q000276:immunology*; D002460:Cell Line; D057809:HEK293 Cells; D006801:Humans; D008213:Lymphocyte Activation; D051379:Mice; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; C558381:BTN3A1 protein, human; D000071797:Butyrophilins; D016692:Receptors, Antigen, T-Cell, gamma-delta
keywords: Butyrophilin; Human γδ T cells; Phosphoantigen; T-cell activation; T-cell receptor