ABSTRACT
Objective To investigate the change of serum concentrations of IL‐17A and CXCL12 in patients with chronic ob‐structive pulmonary disease(COPD) and its correlation with illness severity and formation of lymph follicles .Methods Totally 88 cases of patients with COPD in acute phase in our hospital from 1 January 2014 to 1 January 2015 were selected as the research sub‐jects ,and were divided into mild group(n= 23) ,moderate group(n= 42) and severe group(n= 23) according to the severity of COPD ,and were divided into lymph follicles group(n=21) and non lymph follicles group(n=67) according to lymphoid follicles formation .Enzyme‐linked immunosorbent method was applied to detect the serum IL‐17A and CXCL12 concentrations of these groups in acute aggravating period and stability period ,and parameters of pulmonary function in the same period were also detected . The correlations of serum concentrations of IL‐17A and CXCL12 with illness severity ,formation of lymph follicles and lung function in patients with COPD were analysed .Results Compared with mild group ,serum concentrations of IL‐17A and CXCL12 of moder‐ate group and severe group in acute aggravating period and stable period were increased ,while FEV1 and FVC of medium group and severe group in the same period were decreased;compared with the moderate group ,serum concentrations of IL‐17A and CXCL12 of severe group in acute aggravating period and stable period were increased ,while FEV1 and FVC of severe group in the same period were decreased (P<0 .05) .Compared with non lymph follicles group ,serum concentrations of IL‐17A and CXCL12 of lymph folli‐cles group in acute aggravating period and stable period were increased ,while FEV1 and FVC of lymph follicles group in the same period were decreased (P<0 .05) .The results of correlation analysis showed that serum concentrations of IL‐17A and CXCL12 in patients with COPD were positively correlated to the illness severity and lymph follicle formation rate(IL‐17A :r=0 .728 ,0 .762 ;CXCL12 :r=0 .752 ,0 .776 ,P<0 .05) ,while were negatively correlated to FEV1 and FVC(IL‐17A :r= -0 .756 ,-0 .783 ;CXCL12 :r= -0 .743 ,-0 .767 ,P<0 .05) .Conclusion Serum concentrations of IL‐17A and CXCL12 in patients with COPD were associated with its illness severity ,pulmonary function and lymphoid follicles formation ,which may serve as a reference indexes for the assess‐ment of the illness severity ,pulmonary function and lymph follicle formation .