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Adenovirus-mediated transduction with Histone Deacetylase 4 ameliorates disease progression in an osteoarthritis rat

Xiao-Dong Gu1, Lei Wei2, Peng-Cui Li1

  • 1Department of Orthopaedics, The Second Hospital of Shanxi Medical University, Shanxi Key Laboratory of Bone and Soft Tissue Injury Repair, Taiyuan, Shanxi, PR China.

International Immunopharmacology
|July 17, 2019
PubMed
Abstract

Insights

Histone deacetylase-4 (HDAC4) upregulation protects against osteoarthritis (OA) by reducing cartilage damage and promoting cartilage repair. This suggests HDAC4 may be a therapeutic target for OA patients.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Orthopedics

Background:

  • Osteoarthritis (OA) involves cartilage degeneration, partly due to reduced histone deacetylase-4 (HDAC4) levels.
  • Reduced HDAC4 promotes runt-related transcription factor-2 (Runx-2) and OA-related gene expression.
  • The role of HDAC4 upregulation in OA cartilage damage is not well understood.

Purpose of the Study:

  • To investigate the effect of HDAC4 upregulation on cartilage damage in a rat model of osteoarthritis.
  • To determine if increasing HDAC4 levels can offer chondroprotection.

Main Methods:

  • Rat chondrocytes were treated with interleukin-1β (IL-1β) and adenovirus vectors expressing HDAC4 (Ad-HDAC4-GFP) or control (Ad-GFP).
  • A rat osteoarthritis model was established using anterior cruciate ligament transection (ACLT), followed by intra-articular injections of Ad-HDAC4-GFP or Ad-GFP.
  • Cartilage damage, gene expression (RT-qPCR), protein levels (ELISA, IHC), and osteophyte formation were assessed at various time points.

Main Results:

  • HDAC4 overexpression in chondrocytes reduced pro-degeneration markers (Runx-2, MMP-13, Collagen X) and increased anabolic markers (Collagen II, Aggrecan).
  • In vivo, HDAC4 upregulation significantly decreased cartilage damage, osteophyte formation, and overall OA progression.
  • HDAC4 expression was confirmed in treated rats, indicating successful upregulation.

Conclusions:

  • HDAC4 upregulation attenuates articular cartilage damage in an OA rat model.
  • HDAC4 acts by repressing Runx-2, MMP-13, and Collagen X while inducing Collagen II and Aggrecan.
  • Increased HDAC4 levels demonstrate chondroprotective potential and may be a therapeutic strategy for osteoarthritis.
Keywords:
Adenovirus vectorAnterior cruciate ligament transection (ACLT)Histone deacetylase 4Osteoarthritis (OA)Rat chondrocyte

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