Correlation Between Proteolytic Enzymes and Microangiogenesis in Degenerative Intervertebral Disc Nucleus

Area of Science:

• Biomedical Science
• Orthopedics
• Cell Biology

Background:

• Degenerative disc disease (DDD) is a significant cause of low back pain.
• The pathophysiology of DDD involves complex cellular and molecular changes within the intervertebral disc.
• Microangiogenesis and altered enzyme activity are implicated in DDD progression.

Purpose of the Study:

• To investigate the correlation between proteolytic enzymes and microangiogenesis in degenerative intervertebral disc nucleus.
• To analyze the expression of specific enzymes like aminopeptidase N (APN) and leucine aminopeptidase (LAP) in degenerated discs.
• To assess the presence and distribution of microvessels in degenerative disc tissue.

Main Methods:

• Histological analysis (H&E staining) of nucleus pulposus tissues from patients with DDD and healthy controls.
• Immunohistochemical staining to detect APN, LAP, and CD31-labeled microvascular endothelial growth factor (VEGF).
• Weidner method for microvessel distribution analysis.

Main Results:

• Degenerative discs showed decreased chondrocytes and altered matrix staining compared to normal discs.
• Significantly higher expression of APN and LAP was observed in degenerative nucleus pulposus.
• Microvessel formation, indicated by CD31 staining, was present in degenerative disc tissues.

Conclusions:

• Increased expression of proteolytic enzymes like aminopeptidase is associated with microvessel formation in degenerative intervertebral discs.
• These findings contribute to understanding the molecular mechanisms of disc degeneration.
• Identifying these markers may aid in the clinical diagnosis and treatment of DDD.