Journal of Jilin University(Medicine Edition) ›› 2020, Vol. 46 ›› Issue (6): 1227-1233.doi: 10.13481/j.1671-587x.20200619

• Research in basic medicine • Previous Articles     Next Articles

Effects of triptolide on angiogenesis and PTEN / PI3K / AKT pathway in model rats with rheumatoid arthritis

Jing LIU,Lijun YAN()   

  1. Department of Rheumatology,Affiliated Tangshan Workers’ Hospital,Hebei Medical University,Tangshan 063000,China
  • Received:2020-03-15 Online:2020-11-28 Published:2022-08-24
  • Contact: Lijun YAN E-mail:jingliujl888@163.com

Abstract:

Objective To investigate the effect of triptolide on the angiogenesis and phosphatase and tensin homolog delected on chromosome/ phosphoinositide-3-kinase / protein kinase B (PTEN / PI3K / AKT) pathway in the rats with rheumatoid arthritis,and to elucidate the possible mechanism of triptolide in the treatment of rheumatoid arthritis.

Methods

A total of 80 rats were randomly divided into control group, model group, positive drug group and treatment group;there were 20 rats in each group.The rheumatoid arthritis model was established with type Ⅱ collagen(Col Ⅱ) induction.The rats in positive drug group were treated with diclofenac sodium sustained-release tablets,and the rats in treatment group were treated with triptolide.After treatment,the body weights, paw thickness and arthritis index scores of the rats in various groups were measured;HE staining was used to determine the pathomorphology of joint synovial tissue of the rats in various groups;immunohistochemical staining was used to determine the microvessel density(MVD) of vascular endothelial growth factor (VEGF) expression level in synovial tissue of the rats in various groups; ELISA method was used to determine the serum levels of VEGF of the rats in various groups;Western blotting method was used to determine the expression levels of PTEN, PI3K, AKT and phosphorylated-AKT (p-AKT) proteins in synovial tissue of the rats in various groups.

Results

Compared with control group, the body weight of rats in model group was decreased (P<0.05), the paw thickness was increased (P<0.05), the MVD and expression level of VEGF in synovial tissue were increased (P<0.05), the expression level of PTEN protein in synovial tissue was decreased (P<0.05), and the expression levels of PI3K, AKT and p-AKT proteins were increased (P<0.05).Compared with model group, the body weights of the rats in positive drug group and treatment group were increased (P<0.05),the paw thickness was decreased (P<0.05),the MVD and the expression levels of VEGF in synovial tissue were decreased (P<0.05), the expression levels of PTEN protein were decreased (P<0.05), and the expression levels of PI3K, AKT and p-AKT proteins were decreased (P<0.05).Compared with positive drug group, the MVD and expression levels of VEGF in synovial tissue of the rats in treatment group were decreased (P<0.05), the expression level of PTEN protein in synovial tissue was increased (P<0.05), and the expression levels of PI3K, AKT and p-AKT proteins were decreased (P<0.05).The paw thickness and arthritis index of rheumatoid arthritis rats were positively correlated with VEGF(r=0.564, r =0.492) and p-AKT(r=0.561, r=0.468) (P<0.05),and negatively correlated with PTEN (r=-0.437, r=-0.521)(P<0.05);MVD was positively correlated with VEGF(r =0.587), PI3K(r =0.567), and p-AKT(r=0.601) (P<0.05), and negatively correlated with PTEN (r=-0.502)(P<0.05).

Conclusion

Triptolide can inhibit the angiogenesis and PTEN / PI3K / AKT pathway activation in the rheumatoid arthritis rats, thereby exerting its therapeutic effect on rheumatoid arthritis.

Key words: triptolide, rheumatoid arthritis, blood vessels, phosphatase and tensin homolog deleted on chromosome ten/phosphoinositide-3-kinase/protein kinase B

CLC Number: 

  • R684.3