Mechanism of penehyclidine hydrochloride alleviating endotoxin-induced lung injury in rats: relationship with Toll-like receptor 4
10.3760/cma.j.cn131073.20220420.00918
- VernacularTitle:盐酸戊乙奎醚减轻大鼠内毒素性肺损伤的机制：与Toll样受体4的关系
- Author:
Xiaoyong WEI
1
;
Tao WANG
;
Junbo ZHAO
;
Shimin GU
;
Bo LIU
;
Lijuan WANG
;
Lihua JIANG
;
Lei WEI
Author Information
1. 郑州大学第三附属医院麻醉科，郑州 450052
- Keywords:
Cholinergic antagonists;
Endotoxins;
Acute lung injury;
Toll-like receptor 4
- From:
Chinese Journal of Anesthesiology
2022;42(9):1108-1111
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the role of Toll-like receptor 4 (TLR4) in the mechanism by penehyclidine hydrochloride alleviating lipopolysaccharide (LPS)-induced acute lung injury(ALI)in rats.Methods:Twenty-four healthy male Sprague-Dawley rats, aged 10 weeks, weighing 220-250 g, were divided into 4 groups ( n=6 each) according to the random number table method: normal saline group (NS group), endotoxin-induced ALI group (ALI group), penehyclidine hydrochloride + normal saline group (PHC+ NS group) and penehyclidine hydrochloride + endotoxin-induced ALI group (PHC+ ALI group). ALI was induced by intratracheal instillation of LPS 5 mg/kg in anesthetized animals. In group PHC+ ALI, penehyclidine hydrochloride 2 mg/kg was intraperitoneally injected immediately after intratracheal instillation of LPS. The equal volume of normal saline was injected into the airway in group NS, and penehyclidine hydrochloride 2 mg/kg was intraperitoneally injected immediately after intratracheal instillation of normal saline in group PHC+ NS. The rats were sacrificed at 6 h after intratracheal instillation of LPS or normal saline, and lungs were removed. The lung was lavaged and broncho-alveolar lavage fluid (BALF) was collected for determination of concentrations of tumor necrosis factor-alpha (TNF-α) and interleukin-1beta (IL-1β) by enzyme-linked immunosorbent assay. Lung tissues were obtained for microscopic examination of the pathological changes (with a light microscope) and for determination of wet to dry lung weight ratio (W/D ratio) and TLR4 protein and mRNA expression (by immuno-histochemistry or real-time polymerase chain reaction). Results:Compared with group NS and group PHC+ NS, the W/D ratio and concentrations of TNF-α and IL-1β in BALF were significantly increased, the expression of TLR4 protein and mRNA in lung tissues was up-regulated ( P<0.01), and the pathological changes of lung tissues were aggravated in group ALI . Compared with group ALI, the W/D ratio and concentrations of TNF-α and IL-1β in BALF were significantly decreased, the expression of TLR4 protein and mRNA in lung tissues was down-regulated ( P<0.01), and the pathological changes of lung tissues were significantly mitigated in group PHC+ ALI. Conclusions:The mechanism by which penehyclidine hydrochloride reduces endotoxin-induced lung injury may be related to reduction of TLR4 activity and thus inhibition of pulmonary inflammatory responses in rats.
