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J Allergy Clin Immunol. 2011 Apr;127(4):1038-45.e1-3. doi: 10.1016/j.jaci.2011.02.006.

Circadian clock gene Period2 regulates a time-of-day-dependent variation in cutaneous anaphylactic reaction.

Author information

1
Department of Immunology, University of Yamanashi Faculty of Medicine, Yamanashi, Japan.

Abstract

BACKGROUND:

IgE-mediated immediate-type skin reaction shows a diurnal rhythm, although the precise mechanisms remain uncertain. Period2 (Per2) is a key circadian gene that is essential for endogenous clockworks in mammals.

OBJECTIVE:

This study investigated whether Per2 regulates a time-of-day-dependent variation in IgE-mediated immediate-type skin reaction.

METHODS:

The kinetics of a passive cutaneous anaphylactic reaction were compared between wild-type mice and mice with a loss-of-function mutation of Per2 (mPer2(m/m) mice). The effects of adrenalectomy, aging, and dexamethasone on the kinetics of a passive cutaneous anaphylactic reaction were also examined. In addition, the extent of IgE-mediated degranulation in bone marrow-derived mast cells (BMMCs) was compared between wild-type and mPer2(m/m) mice.

RESULTS:

A time-of-day-dependent variation in a passive cutaneous anaphylactic reaction observed in wild-type mice was absent in mPer2(m/m) mice and in adrenalectomized and aged mice associated with the loss of rhythmic secretion of corticosterone. In addition, mPer2(m/m) mice showed decreased sensitivity to the inhibitory effects of dexamethasone on the passive cutaneous anaphylactic reactions. IgE-mediated degranulation in BMMCs was comparable between wild-type and mPer2(m/m) mice, but Per2 mutation decreased sensitivity to the inhibitory effects of dexamethasone on IgE-mediated degranulation in BMMCs.

CONCLUSION:

A circadian oscillator, Per2, regulates a time-of-day-dependent variation in a passive cutaneous anaphylactic reaction in mice. Per2 may do so by controlling the rhythmic secretion of glucocorticoid from adrenal glands and/or by gating the glucocorticoid responses of mast cells to certain times of the day (possibly when Per2 levels are high in mast cells).

PMID:
21458659
DOI:
10.1016/j.jaci.2011.02.006
[Indexed for MEDLINE]

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