Ccr5 Deficiency Impairscd4(+)T-Cell Memory Responses And Antigenic Sensitivity Through Increased Ceramide Synthesis
EMBO JOURNAL(2020)
Abstract
CCR5 is not only a coreceptor forHIV-1 infection inCD4(+)T cells, but also contributes to their functional fitness. Here, we show that by limiting transcription of specific ceramide synthases,CCR5 signaling reduces ceramide levels and thereby increases T-cell antigen receptor (TCR) nanoclustering in antigen-experienced mouse and humanCD4(+)T cells. This activity isCCR5-specific and independent ofCCR5 co-stimulatory activity.CCR5-deficient mice showed reduced production of high-affinity class-switched antibodies, but only after antigen rechallenge, which implies an impaired memoryCD4(+)T-cell response. This study identifies aCCR5 function in the generation ofCD4(+)T-cell memory responses and establishes an antigen-independent mechanism that regulatesTCRnanoclustering by altering specific lipid species.
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Key words
ccr5[delta]32,humoral response,membrane phase,sphingolipid,T-cell receptor
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