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Journal Article
Review
Lessons from CTLA-4 deficiency and checkpoint inhibition.
Current Opinion in Immunology 2017 December
CTLA-4 is a crucial negative regulator of immune responses. Absence of CTLA-4 in mice causes autoimmunity and lethal multiorgan lymphocytic infiltration and tissue destruction. Recently, heterozygous CTLA4 or biallelic LRBA mutations leading to functional CTLA-4 deficiency and autoimmunity have been discovered. LRBA was identified as a novel regulator of steady-state CTLA-4 protein levels in Tregs and activated T cells. CTLA-4 deficiency due to checkpoint blockade cancer immunotherapy has also been found to lead to autoimmune reactions. Studies investigating the variable efficacy and adverse autoimmune responses to checkpoint therapy elucidated a role of the microbiota in promoting antitumor and autoreactive immune responses that are regulated by CTLA-4.
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