[The role of ROS/TXNIP/NLRP3 pathway in the skin injury of trichloroethylene sensitized mice].

Objective: To explore the mechanism of reactive oxygen species/thioredoxin-interacting protein/nucleotide-binding oligomerization domain-like receptor 3 (ROS/TXNIP/NLRP3) pathway in the skin injury of trichloroethylene (TCE) sensitized mice. Methods: In August 2020, 40 female BALB/c mice were randomly divided into control group (n=5) , solvent control group (n=5) , TCE treatment group (n=15) and TCE+(2-(2, 2, 6, 6-Tetrameyhylpiperidin-1-oxyl-4-ylamino)-2-oxoethyl) triphenylphosphonium chloride (Mito TEMPO) treatment group (n=15) . The TCE sensitization model was established. Mice in the TCE treatment group and TCE+Mito TEMPO treatment group were divided into the sensitized positive group and the sensitized negative group according to the skin erythema and edema reactions on the back of the mice 24 h after the last stimulation. The mice were sacrificed 72 h after the last stimulation, the back skin of the mice was taken, and the skin lesions were observed. Immunohistochemistry (IHC) was used to detect the expression level of NLRP3, and the Western Blot was performed to detect the expression levels of NLRP3, apoptosis-associated speck-like protein containing a CARD (ASC) , cysteinyl aspartate specific proteinase 1 (Caspase 1) , Interleukin-1β (IL-1β) and TXNIP proteins in the skin of the mice, the reactive oxygen species (ROS) kit was used to detect the level of intracellular ROS in the back skin tissue. Results: The sensitization rates of TCE treatment group and TCE+Mito TEMPO treatment group were 40.0% (6/15) and 33.3% (5/15) , respectively, and there was no significant difference between the two groups (P>0.05) . The back skin of the mice in the TCE sensitized positive group was thickened and infiltrated by a large number of inflammatory cells. The number of mitochondria in the epidermis cells was significantly reduced, the mitochondrial crest disappeared and vacuolar degeneration occurred. TCE+Mito TEMPO sensitized positive group had less damage, more mitochondria and relatively normal cell structure. Compared with the solvent control group and corresponding sensitized negative groups, the expression levels of NLRP3, ASC, Caspase 1, IL-1β, TXNIP proteins and the content of ROS in the TCE sensitized positive group and TCE+Mito TEMPO sensitized positive group were significantly increased (P<0.05) . Compared with TCE sensitized positive group, the expression levels of NLRP3, ASC, Caspase 1, IL-1β, TXNIP proteins and the content of ROS in the TCE+Mito TEMPO sensitized positive group were significantly decreased (P<0.05) . Conclusion: ROS/TXNIP/NLRP3 pathway was activated and then encouraged the release of IL-1β, finally aggravated the TCE-induced skin injury.目的： 探讨活性氧/硫氧还蛋白相互作用蛋白/核苷酸结合寡聚化结构域样受体3（ROS/TXNIP/NLRP3）通路在三氯乙烯（TCE）致敏小鼠皮肤损伤中的作用机制。 方法： 于2020年8月，将40只雌性BALB/c小鼠随机分为空白对照组（5只）、溶剂对照组（5只）、TCE处理组（15只）、TCE+（2-（2, 2, 6, 6-四甲基哌啶-1-氧基4-亚胺）-2-氧乙基）三苯基氯化磷（Mito TEMPO）联合处理组（15只），建立TCE致敏小鼠模型。在末次激发后24 h根据小鼠背部皮肤红斑和水肿情况将TCE处理组和TCE+Mito TEMPO联合处理组小鼠分别分为致敏阳性组和致敏阴性组。末次激发后72 h处死小鼠，取小鼠背部皮肤，观察小鼠皮肤损伤情况，免疫组织化学法检测小鼠背部皮肤组织NLRP3的表达情况，Western Blot检测小鼠背部皮肤NLRP3、凋亡相关斑点样蛋白（ASC）、半胱氨酸天冬氨酸蛋白酶1（Caspase 1）、白介素1β（IL-1β）和TXNIP的相对表达情况，并检测背部皮肤组织细胞内ROS水平。 结果： TCE组和TCE+Mito TEMPO组小鼠致敏率分别为40.0%（6/15）和33.3%（5/15），两组间差异无统计学意义（P>0.05）。TCE致敏阳性组小鼠背部皮肤表皮明显增厚且有大量炎性细胞浸润，表皮细胞内线粒体数量明显减少，线粒体嵴消失并出现空泡变性；TCE+Mito TEMPO组损伤较之减轻，线粒体数量较多，细胞结构相对正常。TCE致敏阳性组和TCE+Mito TEMPO致敏阳性组小鼠皮肤NLRP3、ASC、Caspase 1、IL-1β和TXNIP蛋白相对表达水平以及ROS含量明显高于溶剂对照组和相应致敏阴性组（P<0.05）；TCE+Mito TEMPO致敏阳性组NLRP3、ASC、Caspase 1、IL-1β和TXNIP蛋白相对表达水平以及ROS含量明显低于TCE致敏阳性组（P<0.05）。 结论： 在TCE所致药疹样皮炎中，ROS/TXNIP/NLRP3通路激活促进IL-1β的释放，加重皮肤损伤。.