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Generation of Induced-pluripotent Stem Cells Using Fibroblast-like Synoviocytes Isolated from Joints of Rheumatoid Arthritis Patients
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Exosomal miRNA-486-5p derived from rheumatoid arthritis fibroblast-like synoviocytes induces osteoblast

Jie Chen1, Mao Liu, Xiao Luo

  • 1Department of Rheumatology and Immunology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, P.R. China. cjlion@qq.com.

Biomaterials Science
|May 15, 2020
PubMed

Insights

Rheumatoid arthritis fibroblast-like synoviocyte exosomes (RA-FLSs-exos) carrying miR-486-5p promote osteoblast differentiation. This finding identifies a novel therapeutic target for rheumatoid arthritis (RA) treatment by modulating bone health.

Area of Science:

  • Cell Biology
  • Immunology
  • Orthopedics

Background:

  • Rheumatoid arthritis (RA) pathogenesis involves impaired osteoblast differentiation.
  • Fibroblast-like synoviocyte-derived exosomes (RA-FLSs-exos) play a role in RA.
  • MicroRNAs (miRNAs) are critical regulators of RA progression.

Purpose of the Study:

  • To investigate the impact of RA-FLS-exos on osteoblast differentiation.
  • To identify specific exosomal miRNAs responsible for this effect.
  • To explore potential therapeutic targets for RA.

Main Methods:

  • Co-culture of RA-FLSs-exos with osteoblasts.
  • Assessment of osteoblast differentiation markers (ALP, Alizarin Red S, Osx, OC, Col1a1, Dlx2).
  • Establishment of collagen-induced arthritis (CIA) mouse models.

Main Results:

  • RA-FLSs-exos were phagocytosed by osteoblasts.
  • Increased miR-486-5p in RA-FLSs-exos enhanced osteoblast differentiation.
  • miR-486-5p targeted Tob1, activating the BMP/Smad pathway and promoting osteoblast differentiation.
  • RA-FLSs-exos with miR-486-5p reduced RA severity in CIA mice by decreasing Tob1.

Conclusions:

  • RA-FLSs-exos containing miR-486-5p promote osteoblast differentiation.
  • miR-486-5p acts via Tob1 and the BMP/Smad pathway.
  • This pathway presents a promising therapeutic target for RA.

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