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1.陕西中医药大学 基础医学院,陕西 咸阳 712046
2.陕西中医药大学 附属医院,陕西 咸阳 712000
王文霸,在读硕士,从事肺肠合治法治疗肺系疾病的实验研究,E-mail:949222779@qq.com
惠毅,博士,副教授,从事肺肠合治法治疗呼吸系统疾病的基础与临床研究,E-mail:drhy1982@126.com; *
史捷,硕士,主任医师,从事中医药治疗呼吸系统疾病的基础与临床研究,E-mail:2780067265@qq.com
收稿日期:2021-05-18,
网络出版日期:2021-08-12,
纸质出版日期:2022-04-20
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王文霸,闫曙光,李京涛等.基于VIP/cAMP/PKA/AQPs信号通路研究肺肠合治法减轻肺水肿治疗急性肺损伤的作用机制[J].中国实验方剂学杂志,2022,28(08):101-107.
WANG Wen-ba,YAN Shu-guang,LI Jing-tao,et al.Mechanism of Combined Therapy of Lung and Intestine in Alleviating Pulmonary Edema in Treatment of Acute Lung Injury Based on VIP/cAMP/PKA/AQPs Signaling Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(08):101-107.
王文霸,闫曙光,李京涛等.基于VIP/cAMP/PKA/AQPs信号通路研究肺肠合治法减轻肺水肿治疗急性肺损伤的作用机制[J].中国实验方剂学杂志,2022,28(08):101-107. DOI: 10.13422/j.cnki.syfjx.20211902.
WANG Wen-ba,YAN Shu-guang,LI Jing-tao,et al.Mechanism of Combined Therapy of Lung and Intestine in Alleviating Pulmonary Edema in Treatment of Acute Lung Injury Based on VIP/cAMP/PKA/AQPs Signaling Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(08):101-107. DOI: 10.13422/j.cnki.syfjx.20211902.
目的
2
探究肺肠合治法(麻黄汤+大承气汤)减轻脂多糖(LPS)诱导的急性肺损伤(ALI)大鼠肺水肿的作用和机制。
方法
2
Wistar大鼠随机分为正常组、模型组、肺肠合治低、中、高剂量组、地塞米松组。采用LPS(10 mg·kg
-1
)腹腔注射复制ALI大鼠模型,造模后开始灌胃给药,正常组给予生理盐水(25 mL·kg
-1
),肺肠合治低(5 g·kg
-1
)、中(7.5 g·kg
-1
)、高(10 g·kg
-1
)剂量组分别给予(麻黄汤+大承气汤)灌胃,阳性药组给予地塞米松(5 mg·kg
-1
),分别于LPS注射后0、8、16 h给药,共3次。给药结束后取肺组织及血清,肺组织苏木素-伊红(HE)染色,进行肺水肿评分;计算各组大鼠肺组织干/湿(D/W)质量比;酶联免疫吸附测定法(ELISA)检测大鼠血清血管活性肠肽(VIP)含量;蛋白免疫印迹法(Western blot)检测各组大鼠肺组织水通道蛋白1(AQP1)、水通道蛋白5(AQP5)、VIP、环磷酸腺苷(cAMP)、磷酸化蛋白激酶A(p-PKA)、蛋白激酶A(PKA)蛋白的表达量;实时荧光定量聚合酶链式反应(Real-time PCR)检测各组大鼠肺组织中VIP mRNA表达。
结果
2
与正常组比较,模型组大鼠肺损伤明显,水肿评分升高,肺组织D/W降低(
P
<
0.01),肺组织AQP1、AQP5、cAMP、p-PKA/PKA明显降低(
P
<
0.05,
P
<
0.01),VIP含量显著升高(
P
<
0.01),肺组织VIP蛋白和mRNA表达明显升高(
P
<
0.05,
P
<
0.01);与模型组比较,肺肠合治组大鼠肺损伤减轻,肺组织D/W显著升高(
P
<
0.01),肺组织AQP1、AQP5、VIP、cAMP、p-PKA/PKA升高(
P
<
0.05,
P
<
0.01),肺组织VIP表达升高(
P
<
0.05,
P
<
0.01)。
结论
2
肺肠合治法能减轻急性肺损伤造成的肺组织水肿,其机制可能通过激活VIP/cAMP/PKA信号通路,进而促进水通道蛋白AQP1、AQP5的表达,增强肺组织的水液代谢有关。
Objective
2
To explore the mechanism of the combined therapy of lung and intestine (Mahuangtang + Da Chengqitang) in alleviating pulmonary edema in rats with acute lung injury (ALI) induced by lipopolysaccharide (LPS).
Method
2
Wistar rats were randomly divided into blank group, model group, low-, medium-, and high-dose groups with combined therapy of lung and intestine, and positive control group. LPS (10 mg·kg
-1
) was given (
ip
) to induce ALI in rats. After modeling, the blank group was given normal saline (25 mL·kg
-1
), the combined therapy of lung and intestine treatment groups were given (ig) low- (5 g·kg
-1
), medium- (7.5 g·kg
-1
), and high-dose (10 g·kg
-1
) Mahuangtang and Da Chengqitang, and the positive control group was given dexamethasone (5 mg·kg
-1
). Medications were administered 0, 8, and 16 h after LPS injection for 3 times. Then lung tissue and serum were collected after administration. The lung tissues were stained with haematoxylin-eosin (HE), and the pulmonary edema score was evaluated. The dry/wet (D/W) weight ratio of lung tissues in each group was measured, and the content of serum vasoactive intestinal peptide (VIP) in rats was detected by enzyme-linked immunosorbent assay (ELISA). Western blot was used to detect the protein levels of aquaporin-1 (AQP1), AQP5, VIP, cyclic adenosine monophosphate (cAMP), phosphorylated protein kinase A (p-PKA), and PKA in lung tissues of rats in each group. The level of VIP mRNA in lung tissues of rats was detected by real-time quantitative polymerase chain reaction (Real-time PCR).
Result
2
Compared with the blank group, the model group exhibited obvious lung injury, increased edema score, decreased D/W ratio (
P
<
0.01), declined AQP1, AQP5, cAMP, and p-PKA/PKA in lung tissues (
P
<
0.05,
P
<
0.01), elevated VIP content (
P
<
0.01), and up-regulated levels of VIP protein and mRNA in lung tissues (
P
<
0.05,
P
<
0.01). Compared with the model group, combined therapy of lung and intestine treatment groups showed alleviated lung injury, increased D/W ratio (
P
<
0.01), elevated AQP1, AQP5, VIP, cAMP, and p-PKA/PKA in lung tissues (
P
<
0.05,
P
<
0.01), and up-regulated VIP levels in lung tissues (
P
<
0.05,
P
<
0.01).
Conclusion
2
The combined therapy of lung and intestine can alleviate ALI-induced lung tissue edema, and the mechanism may be related to the activation of the VIP/cAMP/PKA signaling pathway, which further promotes the expression of AQP1 and AQP5 and enhances the water metabolism of lung tissue.
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