[关键词]
[摘要]
目的 研究四逆散对胆汁淤积性肝损伤(CLI)大鼠肝组织中胆汁酸及胆汁酸转运蛋白表达的影响。 方法 将 SD 大鼠随机分为空白组、模型组、熊去氧胆酸组(60 mg·kg-1 )、四逆散高剂量组(3.78 g·kg-1 )、四逆散 低剂量组(1.89 g·kg-1 ),每组 6 只。每天灌胃给药 1 次,连续 10 d。除空白组外,其余各组于给药第 5 天一 次性灌胃 α-萘异硫氢酸酯(ANIT)橄榄油溶液(100 mg·kg-1 ·d-1 ),复制 CLI 大鼠模型。检测血清生化指标包括: 谷丙转氨酶(ALT)、谷草转氨酶(AST)、碱性磷酸酶(ALP)、总胆汁酸(TBA)、总胆红素(TBIL)、直接胆红素 (DBIL)水平;采用 HE 染色法观察肝脏组织病理变化;UHPLC-MS/MS 法检测肝组织中的胆汁酸含量; qRT-PCR 及 Western Blot 法检测肝组织中多重耐药相关蛋白 2(MRP2)、多重耐药相关蛋白 1(MDR1)、多重耐 药相关蛋白 3(MDR3)、Na+ /牛磺胆酸协同转运蛋白(NTCP)、胆盐输出泵(BSEP)、法尼醇 X 受体(FXR) mRNA 及蛋白表达情况。结果 与空白组比较,模型组大鼠体质量明显降低(P<0.05);血清 ALT、AST、ALP、 TBA、TBIL、DBIL 水平均显著升高(P<0.01);肝组织病理评分显著升高(P<0.01);肝组织中 TCA、 T-β-MCA、T-ω-MCA 的含量明显升高(P<0.05),UDCA、ɑ-MCA、β-MCA 的含量明显降低(P<0.05,P< 0.01);肝组织中 FXR、MRP2、BSEP、NTCP、MDR1 mRNA 表达水平均显著降低(P<0.01),MDR3 mRNA 表 达水平明显升高(P<0.05);肝组织中 BSEP、NTCP、MDR3、MDR1、MRP2、FXR 蛋白表达水平均明显降低 (P<0.05,P<0.01)。与模型组比较,(1)各给药组大鼠体质量明显升高(P<0.05),血清 ALT、AST、ALP、 TBA、TBIL、DBIL 水平均显著降低(P<0.01),肝组织病理评分显著降低(P<0.01);(2)各给药组大鼠肝组织 中 TCA、T-β-MCA 的含量均明显下降(P<0.05),四逆散高、低剂量组大鼠肝组织中 T-ω-MCA 含量明显下降 (P<0.05),四逆散低剂量组大鼠肝组织中 GLCA、ɑ-MCA 的含量明显升高(P<0.05,P<0.01);(3)各给药组 大鼠肝组织 MRP2、NTCP、MDR1 mRNA 表达水平均显著升高(P<0.01),四逆散高、低剂量组大鼠肝组织 FXR mRNA 表达水平显著升高(P<0.01),四逆散低剂量组大鼠肝组织 BSEP mRNA 表达水平显著升高(P< 0.01),熊去氧胆酸组及四逆散高剂量组大鼠肝组织 MDR3 mRNA 表达水平明显降低(P<0.05);(4)各给药组 大鼠肝组织 BSEP、MDR1、MRP2、FXR 蛋白表达水平均明显升高(P<0.05,P<0.01),熊去氧胆酸组及四逆 散低剂量组大鼠肝组织 NTCP 蛋白表达水平均显著升高(P<0.01),四逆散高、低剂量组大鼠肝组织 MDR3 蛋 白表达水平均显著升高(P<0.01)。结论 四逆散可以改善 CLI 大鼠的肝脏组织病理损伤及肝功能指标,促进 胆汁酸排泄,具有保肝利胆作用,其作用机制可能与调控胆汁酸转运蛋白表达,降低胆汁酸水平有关。
[Key word]
[Abstract]
Objective To investigate the effects of Sini San on bile acids and the expression of bile acid transport proteins in liver tissues of rats with cholestatic liver injury (CLI). Methods SD rats were randomly divided into a blank group,a model group,a ursodeoxycholic acid group (60 mg·kg-1 ),a high-dose Sini San group (3.78 g·kg-1 ),and a low-dose Sini San group (1.89 g·kg-1 ),with 6 rats in each group. The rats were orally administered once daily for 10 consecutive days. Except for the blank group,all other groups were orally administered α-naphthylisothiocyanate (ANIT) olive oil solution (100 mg·kg-1 ·d-1 ) on the fifth day to establish the CLI rat model. Serum biochemical indicators, including alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), total bile acid (TBA), total bilirubin (TBIL), and direct bilirubin (DBIL), were measured. Liver histopathological changes were observed using HE staining. Bile acid content was detected by UHPLC-MS/MS. The mRNA and protein expression levels of multidrug resistance-associated protein 2(MRP2), multidrug resistanceassociated protein 1(MDR1), multidrug resistance-associated protein 3(MDR3), Na+ /taurocholate cotransporting polypeptide (NTCP),bile salt export pump (BSEP),and farnesoid X receptor (FXR) in liver tissues were detected by qRT-PCR and Western Blot. Results Compared with the blank group, the body mass of the model group rats significantly decreased (P<0.05); serum levels of ALT, AST, ALP, TBA, TBIL, and DBIL significantly increased (P<0.01); liver histopathological scores significantly increased (P<0.01); the contents of TCA, T-β-MCA,and T-ω-MCA in liver tissues significantly increased (P<0.05),while the contents of UDCA,ɑ-MCA, and β -MCA significantly decreased (P<0.05, P<0.01); the mRNA expression levels of FXR, MRP2, BSEP, NTCP, and MDR1 in liver tissues significantly decreased (P<0.01), while the mRNA expression level of MDR3 significantly increased (P<0.05);the protein expression levels of BSEP,NTCP,MDR3,MDR1,MRP2,and FXR in liver tissues significantly decreased (P<0.05,P<0.01). Compared with the model group,(1) the body mass of rats in all treatment groups significantly increased (P<0.05),serum levels of ALT,AST,ALP,TBA,TBIL,and DBIL significantly decreased (P<0.01), and liver histopathological scores significantly decreased (P<0.01); (2)the contents of TCA and T-β-MCA in liver tissues of rats in all treatment groups significantly decreased (P<0.05), the content of T-ω-MCA in liver tissues of rats in the high- and low-dose Sini San groups significantly decreased (P< 0.05), and the content of GLCA and ɑ -MCA in liver tissues of rats in the low-dose Sini San group significantly increased (P<0.05,P<0.01);(3) the mRNA expression levels of MRP2,NTCP,and MDR1 in liver tissues of rats in all treatment groups significantly increased (P<0.01),the mRNA expression level of FXR in liver tissues of rats in the high- and low-dose Sini San groups significantly increased (P<0.01),the mRNA expression level of BSEP in liver tissues of rats in the low-dose Sini San group significantly increased (P<0.01),and the mRNA expression level of MDR3 in liver tissues of rats in the ursodeoxycholic acid group and the high-dose Sini San group significantly decreased (P<0.05);(4) the protein expression levels of BSEP, MDR1, MRP2, and FXR in liver tissues of rats in all treatment groups significantly increased (P<0.05,P<0.01),the protein expression level of NTCP in liver tissues of rats in the ursodeoxycholic acid group and the low-dose Sini San group significantly increased (P<0.01),and the protein expression level of MDR3 in liver tissues of rats in the high- and low-dose Sini San groups significantly increased (P<0.01). Conclusion Sini San can improve liver histopathological damage and liver function indicators in CLI rats,promote bile acid excretion,and exert hepatoprotective and choleretic effects. Its mechanism may be related to regulating the expression of bile acid transport proteins and reducing bile acid levels.
[中图分类号]
R285.5
[基金项目]
河北省自然科学基金中医药联合基金项目(H2022423305)