Costimulation Blockade Disrupts CD4+ T Cell Memory Pathways and Uncouples Their Link to Decline in ß-Cell Function in Type 1 Diabetes.
J Immunol
; 204(12): 3129-3138, 2020 06 15.
Article
in En
| MEDLINE
| ID: mdl-32404353
ABSTRACT
We previously reported that costimulation blockade by abatacept limits the decline of ß-cell function and the frequency of circulating CD4+ central memory T cells (TCM) (CD45RO+CD62L+) in new-onset type 1 diabetes. In human subjects receiving placebo, we found a significant association between an increase in CD4+ TCM cells and the decline of ß-cell function. To extend and refine these findings, we examined changes in human CD4+ and CD8+ naive and memory T cell subsets at greater resolution using polychromatic flow and mass cytometry. In the placebo group, we successfully reproduced the original finding of a significant association between TCM and ß-cell function and extended this to other T cell subsets. Furthermore, we show that abatacept treatment significantly alters the frequencies of a majority of CD4+ conventional and regulatory T cell subsets; in general, Ag-naive subsets increase and Ag-experienced subsets decrease, whereas CD8+ T cell subsets are relatively resistant to drug effects, indicating a lesser reliance on CD28-mediated costimulation. Importantly, abatacept uncouples the relationship between changes in T cell subsets and ß-cell function that is a component of the natural history of the disease. Although these data suggest immunological markers for predicting change in ß-cell function in type 1 diabetes, the finding that abatacept blunts this relationship renders the biomarkers nonpredictive for this type of therapy. In sum, our findings point to a novel mechanism of action for this successful immunotherapy that may guide other disease-modifying approaches for type 1 diabetes.
Full text:
1
Database:
MEDLINE
Main subject:
B-Lymphocytes
/
CD4-Positive T-Lymphocytes
/
Diabetes Mellitus, Type 1
/
Immunologic Memory
Type of study:
Clinical_trials
/
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
J Immunol
Year:
2020
Type:
Article