Molecular therapy of the intervertebral disc

Area of Science:

• Biomolecular research
• Regenerative medicine
• Orthopedics

Background:

• No current biologic treatments exist for disc degeneration.
• Numerous molecules are under investigation for therapeutic potential.

Purpose of the Study:

• To review and categorize molecules being investigated for preventing or reversing disc degeneration.
• To update the understanding of therapeutic molecules beyond traditional growth factors.

Main Methods:

• Systematic review of published literature.
• Analysis of molecules investigated for intervertebral disc biologic therapy.

Main Results:

• Molecules investigated for disc repair are diverse, extending beyond growth factors and cytokines.
• Four main classes identified: anticatabolics (e.g., TIMPs), mitogens (e.g., IGF-1, PDGF), chondrogenic morphogens (e.g., TGF-β, BMPs), and intracellular regulators (e.g., LMP-1, Sox9).
• While in vitro data exist for these molecules, limited in vivo testing in animal models of disc degeneration has been conducted.

Conclusions:

• Further in vivo studies using realistic degeneration models are essential.
• Human trials will require more robust preclinical data from advanced animal models.