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234000 安徽 宿州, 安徽省宿州市宿州学院生物与食品工程学院
[王静,E-mail: 919706556@qq.com WANG Jing, E-mail: 919706556@qq.com
收稿:2022-04-25,
修回:2022-05-18,
纸质出版:2022-11-30
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王静, 李雪, 朱庆林, 等. 老鹳草素对LPS诱导的小鼠急性肺损伤的影响及机制研究[J]. 陆军军医大学学报, 2022,44(22):2300-2306.
Jing WANG, Xue LI, Qinglin ZHU, et al. Effect of
王静, 李雪, 朱庆林, 等. 老鹳草素对LPS诱导的小鼠急性肺损伤的影响及机制研究[J]. 陆军军医大学学报, 2022,44(22):2300-2306. DOI: 10.16016/j.2097-0927.202204188.
Jing WANG, Xue LI, Qinglin ZHU, et al. Effect of
目的
2
研究老鹳草素(
geraniin
)对脂多糖(lipopolysaccharide,LPS)诱导的小鼠急性肺损伤(acute lung injury,ALI)的保护作用机制。
方法
2
48只BALB/c小鼠(雌性,4周龄,18~22g)随机分为空白组(control组)、LPS组、地塞米松组(Dex组,2 mg/kg)、老鹳草素低剂量组(LD组,10 mg/kg)、老鹳草素中剂量组(MD组,20 mg/kg)、老鹳草素高剂量组(HD组,40 mg/kg),每组8只。空白组和LPS组灌胃生理盐水,地塞米松组灌胃地塞米松,老鹳草素各剂量组灌胃相应剂量的药物,生理盐水与各个受试药物均每日1次,连续3 d。末次给药1 h后,除空白组外的其余各组均鼻内滴注LPS(4 mg/kg)构建急性肺损伤模型。造模6 h后,检测各组小鼠肺湿干(wet-to-dry,W/D)质量比。采用HE染色法观察肺组织的病理学改变,测定血液及肺泡灌洗液(bronchoalveolar lavage fluid,BALF)中炎性细胞数;采用酶联免疫吸附法(ELISA)检测血清及BALF中白细胞介素6(IL-6)、白细胞介素-1β(IL-1β)、肿瘤坏死因子α(TNF-α)含量;采用免疫组织化学法检测磷酸化核因子-κBp65(p-NF-κBp65)的表达。
结果
2
与空白组相比,LPS组小鼠肺泡结构破坏、炎性细胞浸润,血清及BALF中IL-6、IL-1β、TNF-α含量、肺W/D比值、BALF中巨噬细胞数目及中性粒细胞数目、肺组织中p-NF-κBp65的相对表达量均显著升高(
P
<
0.01)。与LPS组比较,各给药组中的肺组织病理状态明显得到改善;血清及BALF中IL-6、IL-1β、TNF-α含量、肺W/D比值、BALF中巨噬细胞数目及中性粒细胞数目、肺组织中p-NF-κBp65的相对表达量均显著降低(
P
<
0.05)。
结论
2
老鹳草素对小鼠急性肺损伤具有保护作用,其作用机制可能与其抑制p-NF-κBp65表达、从而减少炎症因子IL-6、IL-1β、TNF-α分泌有关。
Objective
2
To explore the protective mechanism of
geraninn
on acute lung injury (ALI) induced by lipopolysaccharide (LPS) in mice.
Methods
2
Forty-eight BALB/c mice (female
4 weeks old
18~22 g) were randomly divided into 6 groups (
n
=8): the blank group(control group)
the LPS group
the dexamethasone group (Dex group
2mg/kg)
the
geraninn
low dose group (LD group
10 mg/kg)
the
geraninn
medium dose group (MD g
ruop
20 mg/kg) and the
geraninn
high dose group (HD group
40 mg/kg). The mice in blank group and LPS group were fed with normal saline
the mice in the Dex group were fed with dexamethasone and the mice in
geraniin
groups were given corresponding dose of drugs. Normal saline and all tested drugs were given once a day for 3 d. In 1 h later after the last administration
the acute lung injury model was established by using intranasal drip of LPS (4 mg/kg) in all groups except the blank group. In 6 h after modeling
the wet-to-dry (W/D) weight ratio of the lung tissues of mice in each group was collected. The pathological changes of lung tissue were observed by HE staining
and the number of inflammatory cells in broncho alveolar lavage fluid (BALF) and blood was measured; The levels of interleukin-6 (IL-6)
interleukin-1β and tumor necrosis factor α (TNF-α) in plasma and BALF were detected by ELISA. The amount of p-NF-κBp65 was detected by immunohistochemical method.
Results
2
Compared with the blank group
the alveolar structure in LPS group was destroyed
inflammatory cell infiltrated
and the contents of IL-6
IL-1β and TNF-α in serum and BALF in the LPS group increased; The W/D weight ratio of the lung tissues
the number of macrophages and neutrophils in BALF and serum
the relative expression of p-NF-κBp65 in lung tissue also increased(
P
<
0.01). Compared with the LPS group
pathological state of the lung tissues improved obviously among the groups (except the blank group); The contents of IL-6
IL-1β
TNF-α in the serum and BALF
the W/D ratio of the lung tissues
the numbers of macrophages and neutrophils in BALF and the relative expression of p-NF-κBp65 of the lung tissue decreased evidently(
P
<
0.05).
Conclusion
2
Geraninn
has a protective effect on acute lung injury in mice
and its mechanism may be related to the effect that
geraninn
lead
s to repression of p-NF-κB p65 and reduces the expression of inflammatory factors (IL-6
IL-1β and TNF-α).
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