Expression of JAK/STAT signal pathway in collagen-induced rat rheumatoid arthritis / 中华风湿病学杂志

ABSTRACT

Objective To explore the dynamic change and meaning of JAK/STAT signal path in the invasive course of collagen-induced arthritis(CIA).Methods Forty-eight rats were divided into 6 groups ran- domly,eight rats served as the control group,the rest were for the development of CIA models.Rats were sac- rificed at the 2nd,3rd,4th,5th and 6th week after the initial immunity respectively.Then HE staining,im- munohistochemistry and immunoblotting were used to detect the pathological changes of synovium in different st ages and the expression of p-STAT1 and p-STAT3.Results On the second week after initial immunity,the rats had arthritis,and the inflammation achieved its peak at the 4th week,then gradually relieved,and a few joints developed rigidity,synovium hyperplasia and inflammatory cell infiltration could be seen at the second week of initial immunity,and pannus could be seen at the 4th week as well as cartilage destroy at the 6th week by HE staining.In the invasive course of CIA,STAT1 and STAT3 were all in activated state detected by im- munohistochemistry and immunoblotting,which were significantly different from those of control group and they had a positive correlation with arthritis index,the Pearson's value of them were 0.798 and 0.873 respectively. However,there was some difference on time.STAT3 kept at activated state and had positive correlation with pathology score of synovium,and the Pearson's value was 0.622.On the contrary,the activation of STAT1 was obviously delayed and only confined to the middle and advanced stage of the disease.Conclusion JAK/STAT signal pathway participates the pathological course of CIA,and blocking the different point of JAK/STAT path- way'activation process may reach the goal of reversing the RA's pathological course.