Effects of toxoplasmosis infection on the levels of IL-18 and anti-ds-DNA antibodies in SLE patients

Abstract

The present study was set to demonstrate the prevalence of toxoplasmosis infection and its effects on patients with systemic lupus erythematosus (SLE) through determining their serum levels of anti-dsDNA and IL-18 antibodies. For this purpose, the sera from 132 SLE and/or toxoplasmosis patients and 30 healthy women, were collected. The study sample was divided into four groups of SLE, toxoplasmosis, SLE coinfected with toxoplasmosis, and healthy control. Anti-Toxoplasma IgG antibodies were examined for all the samples using ELISA kit. The results showed a high mean level of anti-Toxoplasma IgG among SLE patients coinfected with toxoplasmosis (104.8792±12.31585pg/ml) in comparison to that in toxoplasmosis patients (91.1705±12.57746pg/ml). However, the mean value of anti-dsDNA antibodies showed significant (P≤0.01) elevation in SLE patients and SLE patients coinfected with toxoplasmosis (71.2134±9.22131pg/ml and 72.3699±9.67917 pg/ml, respectively), compared to those infected with toxoplasmosis only and healthy control. Furthermore, the IL-18 mean value in the sera of the studied patients showed significant (P≤0.01) elevation (418.4000±43.18072pg/ml) in SLE patients with toxoplasmosis in comparison to SLE patients (354.4400±35.29257pg/ml). The present investigation suggests that the levels of anti-Toxoplasma IgG antibodies seem to increase in patients with SLE.