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Beta cell-specific CD8+ T cells maintain stem cell memory-associated epigenetic programs during type 1 diabetes

2020; Nature Portfolio; Volume: 21; Issue: 5 Linguagem: Inglês

10.1038/s41590-020-0633-5

1529-2916

Hossam A. Abdelsamed, Caitlin C. Zebley, Hai Dang Nguyen, Rachel L. Rutishauser, Yiping Fan, Hazem E. Ghoneim, Jeremy Chase Crawford, Francesca Alfei, Shanta Alli, Susan Pereira Ribeiro, Ashley Castellaw, Maureen A. McGargill, Hongjian Jin, Shannon Boi, Cate Speake, Elisavet Serti, Laurence A. Turka, Michael Busch, Mars Stone, Steven G. Deeks, Rafick‐Pierre Sékaly, Dietmar Zehn, Eddie A. James, Gerald T. Nepom, Ben Youngblood,

Diabetes Management and Research

The pool of beta cell-specific CD8+ T cells in type 1 diabetes (T1D) sustains an autoreactive potential despite having access to a constant source of antigen. To investigate the long-lived nature of these cells, we established a DNA methylation-based T cell ‘multipotency index’ and found that beta cell-specific CD8+ T cells retained a stem-like epigenetic multipotency score. Single-cell assay for transposase-accessible chromatin using sequencing confirmed the coexistence of naive and effector-associated epigenetic programs in individual beta cell-specific CD8+ T cells. Assessment of beta cell-specific CD8+ T cell anatomical distribution and the establishment of stem-associated epigenetic programs revealed that self-reactive CD8+ T cells isolated from murine lymphoid tissue retained developmentally plastic phenotypic and epigenetic profiles relative to the same cells isolated from the pancreas. Collectively, these data provide new insight into the longevity of beta cell-specific CD8+ T cell responses and document the use of this methylation-based multipotency index for investigating human and mouse CD8+ T cell differentiation. Autoreactive T cells are subject to continuous antigenic stimulation yet sustain their autoreactive functionality. Youngblood and colleagues examine type 1 diabetes systems to show that a pool of autoreactive CD8+ T cells exhibits a stem cell–like signature that facilitates their durable activity.