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2016 ; 213
(12
): 2567-2574
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Adrenergic control of the adaptive immune response by diurnal lymphocyte
recirculation through lymph nodes
#MMPMID27799619
Suzuki K
; Hayano Y
; Nakai A
; Furuta F
; Noda M
J Exp Med
2016[Nov]; 213
(12
): 2567-2574
PMID27799619
show ga
Various aspects of the immune system display circadian rhythms. Although
lymphocyte trafficking has been suggested to show diurnal variations, the
mechanisms and influences on immune responses are unclear. Here, we show in mice
that inputs from adrenergic nerves contribute to the diurnal variation of
lymphocyte recirculation through lymph nodes (LNs), which is reflected in the
magnitude of the adaptive immune response. Neural inputs to ?(2)-adrenergic
receptors (?(2)ARs) expressed on lymphocytes reduced the frequency of lymphocyte
egress from LNs at night, which was accompanied by an increase of lymphocyte
numbers in LNs. Immunization during the period of lymphocyte accumulation in LNs
enhanced antibody responses. The diurnal variation of the humoral immune response
was dependent on ?(2)AR-mediated neural signals and was diminished when
lymphocyte recirculation through LNs was stopped. This study reveals the
physiological role of adrenergic control of lymphocyte trafficking in adaptive
immunity and establishes a novel mechanism that generates diurnal rhythmicity in
the immune system.