Inflammatory profiles in canine intervertebral disc degeneration

Area of Science:

• Veterinary Medicine
• Comparative Pathology
• Biochemistry

Background:

• Intervertebral disc (IVD) disease is a prevalent spinal condition in dogs, characterized by degeneration and inflammation.
• Limited research exists on cytokine and chemokine profiles in canine IVD degeneration, with a focus on gene expression rather than protein levels.

Purpose of the Study:

• To determine levels of prostaglandin E2 (PGE2), cytokines, chemokines, and matrix components in canine IVDs.
• To correlate these levels with IVD degeneration grade and herniation type.
• To investigate cyclooxygenase 2 (COX-2) expression and inflammation in canine IVD samples.

Main Methods:

• Quantification of PGE2, cytokines, chemokines, and glycosaminoglycans (GAGs) in nucleus pulposus (NP) and annulus fibrosus (AF) tissues.
• Histological analysis of COX-2 expression, fibroblast proliferation, and macrophage infiltration.
• Correlation of molecular and histological findings with Pfirrmann degeneration grade and Hansen herniation type.

Main Results:

• Significantly higher PGE2 levels were found in degenerated and herniated IVDs.
• Elevated COX-2 expression, fibroblast proliferation, and macrophage numbers were observed with increased degeneration.
• Chemokine (C-C) motif ligand 2 (CCL2) levels were higher in the NP of extruded disc samples.

Conclusions:

• PGE2 and CCL2 are elevated in degenerated and herniated canine IVDs, indicating their role in IVD disease.
• COX-2 expression and reactive changes in the AF increase with degeneration.
• Further research is needed to explore PGE2 inhibition for pain relief and protective effects in canine IVD disease.