A disintegrin and metalloprotease-17 and galectin-9 are important regulators of local 4-1BB activity and disease outcome in rheumatoid arthritis

作者：Nielsen Morten Aagaard; Andersen Thomas; Etzerodt Anders; Kragstrup Tue Wenzel; Rasmussen Tue Kruse; Stengaard Pedersen Kristian; Hetland Merete Lund; Horslev Petersen Kim; Junker Peter; Ostergaard Mikkel; Hvid Malene; Moestrup Soren K; Deleuran Bent^*

来源：Rheumatology, 2016, 55(10): 1871-1879.

DOI：10.1093/rheumatology/kew237

• 4-1BB
• 4-1BBL
• galectin
• ADAM17
• TACE
• rheumatoid arthritis
• DAS28
• outcome
• TNF
• synovium

Objective. Co-stimulatory T cell cytokines are important in the progression of RA. This study investigates the interplay between 4-1BB, a disintegrin and metalloprotease-17 (ADAM17) and galectin-9 (Gal-9) in RA.
Methods. Stimulated mononuclear cells from patients with chronic RA (n = 12) were co-incubated with tissue inhibitor of metalloproteinase, 4-1BB ligand and Gal-9. Plasma samples were examined for soluble 4-1BB (s4-1BB) in newly diagnosed, treatment-na < ve patients with RA (n = 97). The 28-joint DAS with CRP (28DAS-CRP), total Sharp score, erosion score and joint space narrowing were used to evaluate treatment outcome serially over a 2-year period.
Results. RA CD4(+) and CD8(+) synovial T cells express high levels of 4-1BB. The addition of TNF-alpha to cultured synovial mononuclear cells increased shedding of 4-1BB. 4-1BB ligand only increased TNF-alpha shedding in combination with Gal-9. RNA interference-mediated knockdown of ADAM17 or the addition of an ADAM17 inhibitor reduced the 4-1BB shedding. Shedding of 4-1BB was not influenced by Gal-9. Plasma levels of s4-1BB were increased in early RA and correlated with the number of swollen joints at baseline. After 3 months of treatment, the plasma levels of s4-1BB were equal to those of the controls. Baseline plasma levels of s4-1BB were inversely correlated with DAS28-CRP after 2 years of treatment, but not with total Sharp score, erosion score or joint space narrowing.
Conclusion. ADAM17 induces 4-1BB shedding in RA. Gal-9 is pivotal for the function of 4-1BB and induction of TNF-alpha. Furthermore, high plasma levels of s4-1BB were associated with the number of swollen joints, but also with a low DAS28-CRP after 2 years treatment in early RA.

• 出版日期2016-10