SNRNP70 is Associated with Focal Adhesion-Related Signatures and Chondrocyte Inflammation in Osteoarthritis

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Published on: January 27, 2023

Bohua Gao1, Chunlong Hu2, Qingjun Wei3

  • 1Department of Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital of Guangxi Medical University; Department of Orthopedics Trauma, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University).

Journal of Visualized Experiments : Jove
|July 13, 2026
PubMed

Insights

SNRNP70, a splicing factor, is downregulated in osteoarthritis (OA). Restoring its levels in chondrocytes reduces inflammation and improves cartilage repair, suggesting its potential as an OA diagnostic marker or therapeutic target.

Area of Science:

  • Molecular Biology
  • Genetics
  • Rheumatology

Background:

  • Osteoarthritis (OA) is a degenerative joint disease characterized by cartilage breakdown and inflammation.
  • The molecular mechanisms driving OA pathogenesis are not fully understood.
  • Identifying key molecular players is crucial for developing effective OA treatments.

Purpose of the Study:

  • To investigate the role of SNRNP70, a component of the U1 snRNP splicing complex, in osteoarthritis.
  • To determine if SNRNP70 expression levels correlate with OA and if it influences chondrocyte function.

Main Methods:

  • Analysis of ten public transcriptomic datasets to compare SNRNP70 expression in OA and normal cartilage.
  • Meta-analysis to assess the diagnostic accuracy of SNRNP70 for OA.
  • In vitro experiments using primary rat chondrocytes stimulated with IL-1β to examine SNRNP70 expression and function.
  • Forced expression of SNRNP70 and rescue experiments to evaluate its impact on chondrocyte behavior and signaling pathways.

Main Results:

  • SNRNP70 was consistently downregulated in OA cartilage compared to normal controls.
  • Meta-analysis showed high diagnostic accuracy for OA (AUC = 0.92).
  • Interleukin-1β suppressed SNRNP70 expression in chondrocytes.
  • Forced SNRNP70 expression reduced pro-inflammatory mediators (IL-6, MMP-13), restored ECM components (ACAN, COL2A1), and enhanced chondrocyte migration.
  • SNRNP70 regulation was associated with focal adhesion signaling, which mediated its reparative effects.

Conclusions:

  • SNRNP70 is a potential regulator of chondrocyte function and cartilage homeostasis in OA.
  • SNRNP70 may link spliceosome activity to focal adhesion-mediated matrix synthesis.
  • SNRNP70 warrants further investigation as a diagnostic marker or therapeutic target for OA.

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