免疫耐受型树突状细胞对变应性鼻炎小鼠的调控作用

目的　探讨免疫耐受型树突状细胞（tolerogenic dendritic cells，TolDC）在变应性鼻炎（AR）模型小鼠中的免疫调控作用。方法　SPF级Balb/c小鼠24只，按每组6只随机分成4组，即生理盐水对照组、卵清蛋白致敏的AR小鼠模型组、过继回输TolDC治疗组以及TGF-β/IL-10中和抗体组。分别比较四组间，AR小鼠鼻部症状评分、肺部炎症细胞浸润情况、肺泡灌洗液Th1/Th2炎症因子的表达情况、血清卵清蛋白（OVA）特异性IgE的含量以及肺调节性T细胞（regulatory T cell，Treg）的表达情况。结果　AR小鼠模型建立成功；相较AR模型组，过继回输TolDC治疗组中小鼠鼻部症状显著减轻，肺嗜酸性粒细胞等炎症细胞浸润减轻，肺泡灌洗液Th1/Th2炎症因子的表达下降，血清OVA特异性IgE表达下降，以及肺Treg表达上调；TGF-β/IL-10中和抗体能够逆转TolDC的免疫调控作用。结论　TolDC能够通过TGF-β/IL-10依赖性信号诱导CD4+Foxp3+Treg生成，抑制AR模型小鼠上呼吸道炎症。

Immunoregulatory role of tolerogenic dendritic cells in allergic rhinitis in mice

OBJECTIVE To investigate the immunoregulatory role of tolerogenic dendritic cells(TolDC) in allergic airway inflammation in mouse model of allergic rhinitis(AR).METHODS A total of 24 Balb/c mice were equally and randomly divided into 4 groups with 6 mice in each group. AR group was established with oval bumin(OVA) sensitization and challenge, meanwhile the physiological saline(PBS) sensitization and challenge as the control group. AR group were treated by adoptive transfer of TolDC as treatment group. And treatment group were injected intraperitoneally with TGF-β/IL-10R neutralizing antibody as blockade group. In each group, allergic nasal symptoms score, inflammatory cell infiltration in lung, the expression of Th1/Th2-derived cytokines in the bronchoalveolar lavage fluid(BALF) and nasal lavage fluid(NALF), the expression of OVA-specific serum IgE and the expression of Treg in lung were measured.RESULTS The mouse model of OVA-induced AR was successfully developed. Compared with AR group, treatment group exhibited lower allergic nasal symptoms score, a decrease in inflammatory cell infiltration in lung, lower expression of Th1/Th2-derived cytokines in BALF and NALF and OVA-specific serum IgE, as well as up-regulation of Treg in lung, which were abolished by TGF-β/IL-10 neutralizing antibody shown in blockade group.CONCLUSION TolDC suppress airway inflammation in AR by inducing regulatory T cells through TGF-β/IL-10-dependent mechanisms.