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Related Experiment Video

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Elevated Netrin-4 Expression and Its Action in Infrapatellar Fat Pad.

Yui Uekusa1, Manabu Mukai1, Ayumi Tsukada1

  • 1Department of Orthopedic Surgery, School of Medicine, Kitasato University, 1-15-1 Minami-ku Kitasato, Sagamihara City 252-0374, Kanagawa, Japan.

International Journal of Molecular Sciences
|November 9, 2024
PubMed
Summary

Netrin-4 (NTN4) is elevated in the knee osteoarthritis (KOA) infrapatellar fat pad (IFP), promoting inflammation and cartilage degradation. Targeting NTN4 may offer a new therapeutic strategy for KOA patients.

Keywords:
Netrin-4infrapatellar fat padosteoarthritis

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Orthopedics

Background:

  • Knee osteoarthritis (KOA) involves inflammation and cartilage breakdown.
  • The infrapatellar fat pad (IFP) is an endocrine organ influencing knee inflammation.
  • Netrin-4 (NTN4) is implicated in inflammatory processes and tissue remodeling.

Purpose of the Study:

  • To investigate NTN4 expression in the IFP of KOA patients.
  • To explore the role of NTN4 in KOA pathogenesis.
  • To identify potential therapeutic targets for KOA.

Main Methods:

  • Analysis of IFP from 82 KOA patients undergoing total knee arthroplasty (TKA).
  • Correlation of NTN4 expression with Kellgren-Lawrence (K/L) grades.
  • RNA sequencing (RNA-seq) and quantitative PCR (qPCR) on IFP fibroblastic cells.

Main Results:

  • NTN4 expression was significantly higher in advanced KOA (K/L 3-4) IFP.
  • NTN4 was detected in fibroblastic, hematopoietic, and endothelial cells.
  • NTN4 upregulated pro-inflammatory (IL-17, TNF-α) and matrix degradation genes (IL6, MMP1, CXCL1, CXCL8).

Conclusions:

  • NTN4 promotes inflammation and matrix degradation in the IFP, contributing to KOA pathogenesis.
  • Elevated NTN4 in fibroblastic cells suggests a role in exacerbating joint damage.
  • Targeting NTN4 presents a potential therapeutic avenue for KOA management.