Bioenergetic dysfunction in the pathogenesis of intervertebral disc degeneration

Area of Science:

• Biochemistry
• Cell Biology
• Orthopedics

Background:

• Intervertebral disc (IVD) degeneration is a primary cause of low back pain and disability.
• Current treatments focus on symptom relief, lacking methods to prevent or reverse degeneration.
• Metabolic dysfunction, especially in nucleus pulposus (NP) cells, is an underappreciated factor in IVD degeneration.

Purpose of the Study:

• To review the physiological characteristics of IVDs and metabolic changes during degeneration.
• To highlight the role of cellular metabolism, particularly glycolysis and mitochondrial function, in IVD homeostasis.
• To explore the link between metabolic diseases (diabetes, obesity) and IVD degeneration.

Main Methods:

• Literature review of IVD physiology, pathology, and metabolic alterations.
• Analysis of metabolic gene functions in IVDs.
• Discussion of molecular mechanisms linking metabolic diseases to IVD degeneration.

Main Results:

• IVDs rely on glycolysis and intact mitochondrial function for homeostasis.
• Degenerated NP cells exhibit downregulated glycolysis and mitochondrial function.
• Enhancing glycolysis (e.g., via HIF1α) can protect against IVD degeneration.
• Hyperglycemia in diabetes promotes senescence, apoptosis, and extracellular matrix breakdown in IVDs.

Conclusions:

• Metabolic dysfunction is a critical contributor to IVD degeneration.
• Maintaining glycolysis and mitochondrial function is essential for IVD health.
• Targeting metabolic pathways and correcting systemic metabolic disorders offers a novel therapeutic strategy for IVD degeneration.