[Effect of IL-17A on levels of antiheart autoantibodies in mice with viral myocarditis].

To explore the effect of interleukin-17A (IL-17A) on the serum level of antiheart autoantibodies in mice with viral myocarditis.Male wild-type (WT) and IL-17A-deficient (IL-17A(-/-)) BALB/c mice were intraperitoneally injected with Coxsackie virus B3 (CVB3) for establishing VMC models (VMC-WT group and VMC-IL-17A(-/-) group). Meanwhile, a control group (WT group) of WT mice were established by i.p. administration of phosphate buffered saline (PBS). Paraffin sections of cardiac tissues were made 14 days after CVB3 injection. Myocardial histopathologic changes were evaluated by HE staining. The levels of anti-adenine nucleotide translocator (ANT) autoantibody, anti-β-myosin heavy chain (β-MHC) autoantibody and anti-cardiac L-type calcium channel (CACH2) autoantibody in sera were measured by ELISA.Compared with WT group, the levels of anti-ANT-autoantibody and anti-β-MHC-autoantibody significantly increased in VMC-WT group (P<0.01, P<0.05), while the concentration of anti-CACH2-autoantibody showed no significant difference between WT and VMC-WT groups (P>0.05). Compared with VMC-WT group, the level of anti-ANT-autoantibody was reduced in VMC-IL-17A(-/-) group (P<0.05), while the levels of anti-β-MHC-autoantibody and anti-CACH2-autoantibody showed no significant difference between them (P>0.05).IL-17A contributed to the secretion of anti-ANT-autoantibody of VMC mice, but had no effect on the secretion of anti-β-MHC-autoantibody and anti-CACH2-autoantibody in VMC mice.