Increased Interleukin-17F is Associated with Elevated Autoantibody Levels and More Clinically Relevant Than Interleukin-17A in Primary Sjögren’s Syndrome

Abstract EN

Th17 related immune response is pathogenic in primary Sjögren’s syndrome (pSS).

However, the role of IL-17F, one potent inflammatory member of IL-17 family cytokines in pSS, has not been specifically defined.

We recruited one hundred and nine pSS patients and forty-two healthy controls and their serum levels of IL-17A and IL-17F were determined by multiplex cytokine assays.

White blood cell, red blood cell, neutrophil, lymphocyte, IgM, IgG, C3, C4, RF, ANA, anti-SSA antibody, and anti-SSB antibody were measured by standard laboratory techniques.

EULAR Sjögren’s syndrome disease activity index (ESSDAI) score was also evaluated accordingly.

We found that IL-17F was significantly increased in pSS patients.

Elevated levels of IL-17F were associated with increased IgG and IgM, higher titers of ANA and anti-SSA antibodies, and reduction of C3 and C4.

Patients with higher disease activity also showed higher serum IL-17F levels.

However, serum IL-17A was only increased in patients with longer disease duration and showed few correlation with clinical and laboratory features in pSS patients.

In conclusion, IL-17F was correlated with increased autoantibody levels and disease activity in pSS and is more clinically relevant than IL-17A.