[Treg/Th17 balance and immunology of schistosome infection: a review].

Many factors are reported to be involved in regulating the immunopathogenesis of schistosome infection. CD4+ T cell is one of the key players in the regulation of the liver granuloma formation by differentiation into different effector subsets including T helper (Th) 1, Th2, Th17, and T regulatory cells (Treg cells). Treg cells play an important suppressive role in immunopathology control and favor the pathogen to escape from the host immune assault. The functional activity of Tregs has been related to some autoimmune diseases including asthma and inflammatory bowel disease, which suggests that the manipulation of Tregs to restore their numbers and function may be therapeutic. However, interleukin-17 (IL-17) is a pro-inflammatory cytokine involved in the pathogenesis of many inflammatory and infectious conditions, including schistosomiasis. Therefore, a deeper understanding of the mechanisms of these immune regulations is necessary for the better control of pathology in schistosomiasis. In this paper, we review the Treg/Th17 balance and the immunology of schistosome infection.