[A preliminary study on the role of V-domain Ig suppressor of T cell activation in juvenile idiopathic arthritis].

Objectives: To study the expression of V-domain Ig suppressor of T cell activation (VISTA) in peripheral blood of children with juvenile idiopathic arthritis (JIA) and its role in the pathogenesis of JIA.
Methods: In this prospective study, peripheral blood was collected from 47 children with different subtypes of JIA and 10 healthy children. Flow cytometry was used to measure the expression levels of VISTA, interferon-γ (IFN-γ), and tumor necrosis factor-α (TNF-α) on CD14 ⁺ mononuclear cells, CD4 ⁺ T lymphocytes, and CD8 ⁺ T lymphocytes.
Results: The children with JIA had a significantly lower expression level of VISTA than the healthy children ( P <0.05). There was a significant difference in the expression of VISTA between the children with different subtypes of JIA, with the lowest expression level in those with systemic JIA ( P <0.05). There was also a significant difference in the expression of VISTA between different immune cells, with a significantly higher expression level on the surface of monocytes ( P <0.05). Correlation analysis showed that VISTA was negatively correlated with the expression of IFN-γ and TNF-α on CD4 ⁺ T cells ( r =-0.436 and -0.382 respectively, P <0.05), CD8 ⁺ T cells ( r =-0.348 and -0.487 respectively, P <0.05), and CD14 ⁺ mononuclear cells ( r =-0.582 and -0.603 respectively, P <0.05).
Conclusions: The insufficient expression of VISTA may be associated with the pathogenesis of JIA, and enhancing the immunomodulatory effect of VISTA might be one option for the treatment of JIA in the future.