特应性皮炎小鼠模型中白细胞介素-21、CC趋化因子配体20的表达分析
2020-10-09王娟郑爱义鲍海平
王娟 郑爱义 鲍海平
[摘要]目的 测定白细胞介素-21(IL-21)和CC趋化因子配体20(CCL20)在2,4-二硝基氯苯(DNCB)诱导的特应性皮炎小鼠模型中的表达情况,探讨二者在特应性皮炎发病中的作用。方法 将12只BALB/c雌性小鼠,随机分为模型组和对照组,每组6只,使用DNCB构建小鼠特应性皮炎模型。造模成功后采用酶联免疫吸附法检测小鼠血清中IL-21和CCL20的水平。结果 特应性皮炎模型组小鼠血清中IL-21和CCL20的表达水平均高于对照组,差异有统计学意义(P<0.05),并且二者表达成正相关(r=0.59,P<0.05)。结论 IL-21和CCL20在特应性皮炎小鼠模型中表达升高,且成正相关,可能协同参与了特应性皮炎的发生发展。
[关键词]特应性皮炎;白细胞介素-21;CC趋化因子配体20;小鼠模型
[中图分类号] R751 [文献标识码] A [文章编号] 1674-4721(2020)8(b)-0014-03
[Abstract] Objective To detect the expression of interleukin-21 (IL-21) and CC chemokine ligand 20 (CCL20) in 2,4-dinitrochlorobenzene (DNCB) induced mice models with atopic dermatitis and explore their roles in the pathogenesis of atopic dermatitis. Methods Twelve female BALB/c mice were randomly divided into the model group and control group(6 in each). Mice models with atopic dermatitis were established by DNCB. After successful modeling, the serum levels of IL-21 and CCL20 were detected by enzyme-linked immunosorbent assay(ELISA). Results The serum levels of IL-21 and CCL20 in the model group with atopic dermatitis were significantly higher than those in the control group (P<0.05). There was a positive correlation between the serum levels of IL-21 and CCL20 in the model group(r=0.59, P<0.05).Conclusions The expression of IL-21 and CCL20 in the mouse model of atopic dermatitis is increased and positively correlated, which may be synergistically involved in the occurrence and development of atopic dermatitis.
[Key words] Atopic dermatitis; Interleukin-21; CC chemokine ligand 20; Mouse model
特應性皮炎(AD)是由多种免疫、炎性细胞和细胞因子参与的慢性炎症性皮肤病,皮损顽固难愈,病因和发病机制较为复杂,与遗传、免疫异常、皮肤屏障受损、生存环境和感染等因素有关[1]。不同亚型CD4+T细胞介导的免疫失衡是AD发病的重要环节[2-3]。白细胞介素-21(IL-21)是IL-2家族中重要的多效能细胞因子,可调节淋巴细胞和自然杀伤(NK)细胞的增殖分化,广泛参与体内免疫应答和炎性反应。CC趋化因子配体-20(CCL20)是CC亚族的趋化因子,可趋化表达CC趋化因子受体(CCR)6的淋巴细胞和未成熟树突状细胞向抗原局部定向迁移,与多种自身免疫性疾病有关。本研究通过测定AD小鼠模型血清中IL-21和CCL20的表达变化,探讨二者在AD发病中的作用。
1材料与方法
1.1实验动物与主要试剂
无特定病原体动物(SPF)级7~8周龄健康BALB/c雌性小鼠12只,动物合格证号SCXK(京)2015-0006,由山西大同大学动物实验中心提供。2,4-二硝基氯苯(DNCB)购自美国Sigma公司,小鼠IL-21、CCL20酶联免疫吸附法(ELISA)检测试剂盒购自武汉伊莱瑞特生物科技有限公司。本研究已通过本院医学伦理委员会的审核批准。
1.2方法
1.2.1实验动物造模 12只BALB/c小鼠清洁级实验室饲养1周,适应环境后开始实验,随机分为模型组和对照组,各6只。参考文献[4-5]构建AD小鼠模型,实验前剃除小鼠背部毛发,面积约3 cm×2 cm。模型组小鼠第1~3天背部剃毛区外涂100 μl 1%DNCB溶液(采用丙酮∶橄榄油=1∶3作为基质配制),第4天继续外涂100 μl 0.1%DNCB溶液,改为每间隔1 d外涂1次,直到第28天涂抹后造模完成。造模后小鼠背部皮肤增厚,可见明显红斑、丘疹、丘疱疹、渗出、堆积大量痂屑。对照组小鼠背部剃毛区仅外涂基质,涂抹剂量、间隔时间与模型组相同。
1.2.2皮肤组织病理检查 造模后,无菌条件下两组小鼠背部剃毛区皮肤组织取材,10%甲醛溶液固定、脱水、透明、石蜡包埋、切片染色、封片,镜下观察两组小鼠皮肤组织病理改变。
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(收稿日期:2019-12-13)