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Cell Rep. 2015 Jun 9;11(9):1339-49. doi: 10.1016/j.celrep.2015.04.058. Epub 2015 May 21.

The Cell-Intrinsic Circadian Clock Is Dispensable for Lymphocyte Differentiation and Function.

Author information

1
Immunology Program and Ludwig Center, Howard Hughes Medical Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
2
Immunology Program and Ludwig Center, Howard Hughes Medical Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA. Electronic address: rudenska@mskcc.org.

Abstract

Circadian rhythms regulate many aspects of physiology, ranging from sleep-wake cycles and metabolic parameters to susceptibility to infection. The molecular clock, with transcription factor BMAL1 at its core, controls both central and cell-intrinsic circadian rhythms. Using a circadian reporter, we observed dynamic regulation of clock activity in lymphocytes. However, its disruption upon conditional Bmal1 ablation did not alter T- or B-cell differentiation or function. Although the magnitude of interleukin 2 (IL-2) production was affected by the time of bacterial infection, it was independent of cell-intrinsic expression of BMAL1. The circadian gating of the IL-2 response was preserved in Bmal1-deficient T cells, despite a slight reduction in cytokine production in a competitive setting. Our results suggest that, contrary to the prevailing view, the adaptive immune response is not affected by the cell-intrinsic clock but is likely influenced by cell-extrinsic circadian cues operating across multiple cell types.

PMID:
26004187
PMCID:
PMC4464971
DOI:
10.1016/j.celrep.2015.04.058
[Indexed for MEDLINE]
Free PMC Article

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