Abstract
Summary
IL-35 is a novel anti-inflammatory cytokine, but the exact role of IL-35 in the progression of RA remains unclear, especially associated with osteoporosis and bone erosion. The present research has not been reported. Our purpose is to study how IL-35 affects RA bone destruction.
Introduction
This study investigated the effect of interleukin-35 (IL-35) on OPG and RANKL expression in collagen-induced arthritis (CIA) in rats and in cultured fibroblast-like synoviocytes (FLS).
Methods
Thirty DBA/1J mice were randomly assigned to three groups (n = 10 per group): the control group, the CIA group, and the CIA + IL-35 group. Collagen-induced arthritis was induced by immunization with collagen. IL-35 was intraperitoneally injected daily for 10 days, starting from the 24th day after immunization. FLS cells were isolated and cultured from CIA. The expression of IL-17, RANKL, and OPG was determined by RT-PCR and Western blot. Each experiment was repeated three times.
Results
CIA mice exhibited arthritis symptoms on day 24, followed by a rapid progression of arthritis. The expression of IL-17 and RANKL was increased and the expression of OPG was decreased in CIA mice compared with control mice. IL-35 treatment inhibited the development of arthritis in CIA mice, accompanied by a decrease in the expression of IL-17 and RANKL and an increase in the expression of OPG. Furthermore, IL-35 dose-dependently inhibited the expression of RANKL and increased the expression of OPG in cultured FLS cells.
Conclusion
IL-35 inhibits RANKL expression and increases OPG expression in CIA mice. IL-35 may be used for treating rheumatoid arthritis.
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Abbreviations
- RA:
-
Rheumatoid arthritis
- FLS:
-
Fibroblast-like synoviocytes
- IL-35:
-
Interleukin-35
- CIA:
-
Collagen-induced arthritis
- RANK:
-
Receptor activator of nuclear factor κB
- RANKL:
-
Receptor activator of nuclear factor κB ligand
- OPG:
-
Osteoprotegerin
- EBI:
-
Epstein-Barr virus-induced protein
- Treg:
-
Regulatory T cells
- Th17:
-
T helper type 17
- CFA:
-
Complete Freund’s adjuvant
- IFA:
-
Incomplete Freund’s adjuvant
- FBS:
-
Fetal bovine serum
- HE:
-
Hematoxylin and eosin
- H-DMEM:
-
High glucose Dulbecco’s Modified Eagle’s medium
- DAB:
-
3,3′-diaminobenzidine
- SDS–PAGE:
-
Sodium dodecylsulphate-polyarcylamide gel electrophoresis
- IOD:
-
Integratedoptical density
- AA:
-
Accumulated area
- ANOVA:
-
One-way analysis of variance
- SD:
-
Standard deviation
- LSD:
-
Least significant difference
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (No. 81172867 and 81471542).
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The Institutional Animal Care and Use Committee of China Medical University approved all experimental protocols associated with this study.
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Li, Y., Li, D., Li, Y. et al. Interleukin-35 upregulates OPG and inhibits RANKL in mice with collagen-induced arthritis and fibroblast-like synoviocytes. Osteoporos Int 27, 1537–1546 (2016). https://doi.org/10.1007/s00198-015-3410-9
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DOI: https://doi.org/10.1007/s00198-015-3410-9