Impact of Helicobacter pylori virulence on development of autoimmune thyroid diseases

Abstract

Abstract Background: H. pylori infection has been linked in some controversial studies to the existence of extra-gastrointestinal disorders like autoimmune thyroid disease (AITD). Objective: The study aimed to investigate the impact of the H.pylori virulence factor on progression of autoimmune thyroid disease. Materials and Methods: The study carried out on 90 patients (male and female) with thyroid disorders, and 50 healthy individuals as a control group. Venous blood samples were drawn from all participants, serum obtained after centrifugation and kept in in a labeled Eppendorf tube then stored at -20°C till used in biochemical and immunological assays including: estimation of anti H.pylori IgG to investigate H.pylori infection and detection anti-cag-A IgG titer by ELISA method, while measurement of (T3), (T4), (TSH) and (ATPO) by (e601 cobas) automated immunoassay analyzer. Results: The results of the study recorded a significant increase in mean of TSH concentration (P < 0.01) in patients group particularly in hypothyroidism patients, and a significant increase recorded (P < 0.01) in patients according ATPO level in comparison to control group. On other hand the highest prevalence of H.pylori IgG positive (84%) occur in autoimmune thyroid diseases (AITD) group followed by (63%) for non-AITD while (56%) occur in control group. The results also recorded a highly significant increase in titer of H.pylori IgG (P < 0.01) in patient group as compared to control group, the proportion of female was significantly higher in AITD group (75%), however, there was a significant increase (P < 0.01) in the level of anti-cag IgG in patients as compared to control group, The ratio of infection with H.pylori was greater in the Hashimoto’s thyroiditis group (85.2%) than in the Graves’ disease group (82.4%). Conclusion: our findings state that H. pylori by expressing Cag A may have an impact on the development of autoimmunity thyroiditis.