Acid-sensing Ion Channels: Implications for Intervertebral Disc Degeneration

Area of Science:

• Biomedical Science
• Cell Biology
• Physiology

Background:

• Intervertebral disc degeneration (IDD) is a primary cause of lower back pain, significantly impacting patient quality of life.
• The intervertebral disc (IVD) environment is characterized by hypoxia, ischemia, acidity, and hypertonicity, with matrix acidity negatively influencing IVD cell functions.
• Acid-sensing ion channels (ASICs) are proton-gated ion channels involved in various physiological and pathological processes.

Approach:

• This review comprehensively examines the distribution and specific roles of ASICs, particularly ASIC1a and ASIC3, within the IVD.
• The study investigates the presence of ASICs in key IVD components like the nucleus pulposus (NP), annulus fibrosus, cartilage endplate, and NP-MSCs.
• The review synthesizes current knowledge on how ASICs contribute to the development and pathology of IDD.

Key Points:

• ASICs are present in multiple cell types and regions of the intervertebral disc.
• Specific ASIC subtypes, ASIC1a and ASIC3, exhibit distinct functions relevant to IDD.
• ASIC activity is implicated in modulating gene expression, cell activity, proliferation, and apoptosis within the IVD.

Conclusions:

• ASICs play a significant role in the pathogenesis of intervertebral disc degeneration.
• Understanding ASIC functions in IDD provides insights into the underlying molecular mechanisms.
• Targeting ASICs presents a promising therapeutic strategy for the prevention and treatment of IDD.