Objective To compare the pathogenicity of isolates of sequence type 7(ST-7)Neisseria meningitidis(N.meningitidis)belonging to four different serogroups(A,B,C,and X).Methods Four ST-7 N.meningitidis isolates serogroupe...Objective To compare the pathogenicity of isolates of sequence type 7(ST-7)Neisseria meningitidis(N.meningitidis)belonging to four different serogroups(A,B,C,and X).Methods Four ST-7 N.meningitidis isolates serogrouped as A,B,C,and X and characterized by different capsule structures,were examined for their adhesion and invasion properties,and their ability to induce cytokine release and apoptosis in the host cell(the A549 cell line).Results Among the four ST-7 N.meningitidis isolates,the serogroup A isolate possessed the strongest adhesion and invasion ability.This isolate also induced the release of the highest levels of the proinflammatory mediators interleukin-6,interleukin-1β,and interferon,and the highest apoptosis rate in the host cells.However,there was no significant difference in interleukin-8 and tumor necrosis factor-αsecretion between the four isolates.Based on the findings,the serogroup X N.meningitidis isolate had the weakest pathogenicity,whereas there was almost no difference in the pathogenicity of the isolates from serogroups B and C.Conclusions The differences in the capsular structure of the four isolates of ST-7 N.meningitidis affected their pathogenic capacities.The findings also imply that the hyperinvasive ST-7 N.meningitidis lineage may include hypoinvasive isolates.展开更多
基金supported by the grants from the National Key Program for Infectious Disease of China[No.2018ZX10101002-001-014]the National Natural Scientific Foundation[No.81602903]+1 种基金the Ministry of Science and Technology of the People’s Republic of Chinathe Sanming Project of Medicine in Shenzhen[No.SZSM201803081].
文摘Objective To compare the pathogenicity of isolates of sequence type 7(ST-7)Neisseria meningitidis(N.meningitidis)belonging to four different serogroups(A,B,C,and X).Methods Four ST-7 N.meningitidis isolates serogrouped as A,B,C,and X and characterized by different capsule structures,were examined for their adhesion and invasion properties,and their ability to induce cytokine release and apoptosis in the host cell(the A549 cell line).Results Among the four ST-7 N.meningitidis isolates,the serogroup A isolate possessed the strongest adhesion and invasion ability.This isolate also induced the release of the highest levels of the proinflammatory mediators interleukin-6,interleukin-1β,and interferon,and the highest apoptosis rate in the host cells.However,there was no significant difference in interleukin-8 and tumor necrosis factor-αsecretion between the four isolates.Based on the findings,the serogroup X N.meningitidis isolate had the weakest pathogenicity,whereas there was almost no difference in the pathogenicity of the isolates from serogroups B and C.Conclusions The differences in the capsular structure of the four isolates of ST-7 N.meningitidis affected their pathogenic capacities.The findings also imply that the hyperinvasive ST-7 N.meningitidis lineage may include hypoinvasive isolates.
