Synthesis of chiral phosphoantigens and their activity in gamma delta T cell stimulation.
Gammadelta T cells expressing Vgamma2Vdelta2 T cell receptors are activated by a broad range of phosphorus-containing small molecules, termed phosphoantigens, and are of interest in the context of the chemotherapy of B cell malignancies. Here, we report the synthesis of four pairs of chiral phosphoantigens: the bromohydrins of isopentenyl diphosphate (Phosphostim), the epoxides of isopentenyl diphosphate (EIPP); and the corresponding bromohydrin and epoxide analogs of but-3-enyl diphosphate. The ability of each compound to stimulate human Vgamma2Vdelta2 T cells was determined by TNF-alpha release and cell proliferation. In these assays, the (R)-bromohydrin diphosphates were, on average, about twice as active as the (S)-bromohydrin diphosphates. In contrast, the (S)-form of EIPP was about twice as active as (R)-EIPP. The activities of the epoxy but-3-enyl diphosphates were both very low. These results suggest that chiral phosphoantigens, as opposed to racemic mixtures, may have utility in immunotherapy.
Song
Yongcheng
Y
Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, 61801, USA.
Zhang
Yonghui
Y
Wang
Hong
H
Raker
Amy M
AM
Sanders
John M
JM
Broderick
Erin
E
Clark
Allen
A
Morita
Craig T
CT
Oldfield
Eric
E
D000438:Alcohols / Q000138:chemical synthesis* / Q000276:immunology; D000941:Antigens / Q000737:chemistry* / Q000276:immunology; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D045782:Hemiterpenes / Q000138:chemical synthesis* / Q000276:immunology; D006801:Humans; D008213:Lymphocyte Activation; D009943:Organophosphorus Compounds / Q000138:chemical synthesis* / Q000276:immunology; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000378:metabolism*; D013237:Stereoisomerism; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism*
D000438:Alcohols; D000941:Antigens; D045782:Hemiterpenes; D009943:Organophosphorus Compounds; D016692:Receptors, Antigen, T-Cell, gamma-delta; C023963:bromohydrins; C004809:isopentenyl pyrophosphate