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250-OR: Hypoproliferative CD8 Effector Memory (EM) Subsets Are Linked to Preservation of C-Peptide in Alefacept-Treated Recent-Onset Type 1 Diabetes (T1D) Subjects

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In the ITN T1DAL trial, alefacept (LFA3-Ig fusion protein) preserved endogenous insulin production in 30% of recent onset T1D patients for two years after therapy. Although patients experienced immune alterations following treatment, including depletion of CD2hi effector T-cells and preservation of CD2lo regulatory T-cells, these effects were not predictive of overall response or outcome. However, using an unbiased approach and a combination of flow cytometry, RNA-sequencing, and CyTOF, we were able to identify a CD8 T-cell signature of response at ∼two years following treatment. Preservation of C-peptide was associated with a large transcriptional module (n= 738 genes; R= 0.4, p= 0.023) including activation and exhaustion-associated genes identified at two years following treatment using WGCNA. This module was further dissected into two distinct CD8 EM populations through correlation with hierarchically gated and clustered cytometry data. While both populations expressed multiple inhibitory receptors (IR) (TIGIT, KLRG1, T-bet, EOMES) and were hypo-responsive in in vitro proliferation assays, they were distinguished by higher expression either of markers seen in cytotoxic and terminally differentiated effector T cells (CD57+ Granzyme B+) or of PD-1. Gene expression signatures of both the CD57 and PD-1 subsets significantly overlapped with a previously identified partial exhaustion signature (p= 0.005, for both subsets). Our findings demonstrate an association of partially exhausted memory CD8 T-cells with beneficial clinical response to alefacept as we observed previously with teplizumab (anti-CD3) treatment. Our findings also demonstrate linkage of two phenotypically distinct IR-high, hypo-proliferative CD8 EM T-cell subsets with beneficial response. Together, our findings suggest that pathways regulating proliferation of EM CD8 cells may lead to successful immune interventions for T1D. Disclosure E. Serti: None. K.E. Diggins: None. V.S. Muir: None. T. Lu: None. E. Balmas: None. G.T. Nepom: None. S. Long: None. P. Linsley: Consultant; Self; Bristol-Myers Squibb. Funding National Institute of Diabetes and Digestive and Kidney Diseases/National Institute of Allergy and Infectious Diseases (UM1AI109565)

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  • Reviews in Medical Virology
  • R Mckenzie + 1 more

Reviews in Medical VirologyVolume 6, Issue 2 p. 85-96 Research Article Vaccine Therapy for Herpes Simplex Virus Infections: An Historical Perspective R. McKenzie, R. McKenzie Medical Virology Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1888, USASearch for more papers by this authorS. E. Straus, S. E. Straus Medical Virology Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1888, USASearch for more papers by this author R. McKenzie, R. McKenzie Medical Virology Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1888, USASearch for more papers by this authorS. E. Straus, S. E. Straus Medical Virology Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-1888, USASearch for more papers by this author First published: June 1996 https://doi.org/10.1002/(SICI)1099-1654(199606)6:2<85::AID-RMV167>3.0.CO;2-ECitations: 5AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume6, Issue2June 1996Pages 85-96 RelatedInformation

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