ABSTRACT
Objective By detecting vascular cysteine-rich 61(Cyr61) related factor,connective tissue growth factor (CTGF),vascular endothelial growth factor (VEGF) and CD105 markers of microvascular density (MVD) of muscle tissue in patients with PM/DM,the role and significance of the expression of Cyr61,CTGF,VEGF and CD105 in the process of vascular lesions of dermatomyosits (DM) and polymyosits (PM) were discussed.Methods The expression of Cyr61,CTGF,VEGF and CD105 markers of micro vascular density (MVD) were detected in 10 cases of DM,10 cases of PM and 20 controls by using immunohistochemical Envision two step method.Data were analyzed using Statistical Product and Service Solutions (SPSS) statistical software.Fisher's exact probability analysis and Spearman correlation analysis were conducted.Results Compared with the control group,Cyr61,CTGF,VEGF positive expression rate in muscle tissue of patients with DM and PM group were significantly different (P＜0.01),the positive expression rates of Cyr61,CTGF,VEGF in DM group and PM group were 90％,70％,90％,80％,80％,70％,and the control group (5％,10％,5％) respectively.In the muscle tissue of patients with DM and PM group,CD105 markers of capillaries could be seen,and MVD in DM and PM group were higher than that in the control group,the difference was statistically significant (F=8.103,P=0.001).Cyr61,CTGF and VEGF protein expression levels in muscle tissueof patients with DM and PM were positively correlated with MVD.Conclusion The muscle tissue of PM/DMpatients may have new blood vessels formation.Cyr61,CTGF,VEGF may be involved in the formation of newblood vessels in the PM/DM muscle tissue.The results of this study suggest that microvascular lesion plays animportant role in the immune pathogenesis of inflammatory myopathy such as PM/DM.