This study was approved by the ethics committee of University of Yamanashi Faculty of Medicine. == Results and discussion == CD203c is an activation marker upregulated by cross-linking of FcRI in human basophils4, 5. explore MAC glucuronide phenol-linked SN-38 the cellular mechanism(s) behind the daily symptomatic variations in allergic rhinitis, we determined whether allergen-specific basophil reactivity exhibited a time-of-day-dependent variation in patients with seasonal allergic rhinitis (SAR). Because the circadian clock consisting of an autoregulatory transcriptional network driven by MAC glucuronide phenol-linked SN-38 several clock genes includingClockandPeriodcontrols physiological processes that vary across the daynight cycle3, we also determined whether the circadian clock was functional in basophils and played a role in a time-of-day-dependent variation in allergen-specific basophil reactivity. == Materials and methods == Additional Supporting Information on materials and methods may be found in the online version of this article. == Patients == Eighteen volunteers diagnosed as SAR caused by Japanese cedar pollen (JCP) (a mean age of 30. 5 years) and 11 normal subjects (a mean age of 33. 27 years) were recruited at University of Yamanashi Hospital (Yamanashi, Japan) with written informed consent (Tables S1andS2). The SAR patients were diagnosed by medical doctors based on elevated serum levels of specific IgE to Japanese cedar pollen (JCP) (CAP-FEIA; SRL, Tokyo, Japan) and repeated symptoms in the pollen season without performing skin prick test or nasal provocations with pollen. None of the subjects exhibited symptoms of SAR and were treated with any medication 1 month before and during this study. This study was approved by the ethics committee of University of Yamanashi Faculty of Medicine. == Results and discussion == CD203c is an activation marker upregulated by cross-linking of FcRI in human basophils4, 5. To determine whether allergen-specific basophil reactivity exhibited a time-of-day-dependent variation in SAR, we examined allergen-induced CD203c expression on basophils obtained at AM 7: MAC glucuronide phenol-linked SN-38 00 and PM 7: 00 (19: 00) from patients with JCP pollinosis. Incubation of whole blood samples with the concentration of 0. 3 g/ml, but not 0. 03 or 0. 003 g/ml, of JCP extract significantly induced CD203c expression on basophils from all JCP pollinosis patients tested (Figs1A, B andS1). Thus, we considered this concentration of JCP extract (0. 3 g/ml) as an optimal dose for basophil stimulation in this study so that we used this dose for the following analysis. Stimulation of whole blood samples with JCP extract (0. a few g/ml) or anti-IgE antibody significantly increased the frequency of CD203c+basophils at 7: 00 compared with that at 19: 00 (Fig. 1A, B). In contrast, the frequency of CD203c+basophils stimulated with calcium ionophore A23187 was comparable between at 7: 00 and at 19: 00 (Fig. 1A, B). The time-of-day-dependent variance in JCP-induced basophil CD203 expression was reproduced on different days in individual SAR subjects (Fig. S2and data not shown). Interestingly, basophils Rabbit polyclonal to TranscriptionfactorSp1 from normal subjects also showed a time-of-day-dependent variation in CD203c expression upon stimulation with anti-IgE antibody, but showed comparable induction of CD203c by A23187 between at 7: 00 and at 19: 00 (Fig. 1C). The mRNA expression levels ofPer1andPer3, but notPer2, exhibited a time-of-day-dependent variation at 7: 00 and at 19: 00 in SAR basophils (Fig. 1D). Thus, allergen-specific basophil reactivity showed a time-of-day-dependent variance in patients with JCP pollinosis associated with temporal variations in canonical clock gene expression. Because stimulation of basophils from normal subjects with anti-IgE antibody also showed a time-of-day-dependent variance in CD203c expression, allergen/IgE-mediated basophil reactivity may generally exhibits circadian variations. == Figure 1 . == Allergen-induced upregulation of CD203c MAC glucuronide phenol-linked SN-38 expression on SAR basophils shows a time-of-day-dependent variation. (A, B) Whole blood samples collected at 7: 00 and 19: 00 from patients with SAR were analyzed quantitatively by FACS analysis for CD203c expression on basophils following stimulations with anti-IgE antibody (n= 18), JCP (n= 18), or A23187 (n= 10). Representative FACS data from one subject were shown in (A), and quantitative data were shown in (B). (C) Whole blood samples collected at 7: 00 and 19: 00 from normal subjects were quantitatively analyzed by FACS analysis for CD203c expression on basophils following stimulations with anti-IgE antibody, JCP,.
