Emerging Role of TRP Channels in Osteoarthritis Pathogenesis

TL;DR

TRP channels in joint tissues play a key role in osteoarthritis by affecting cartilage health, inflammation, and pain, making them potential targets for new treatments.

Contribution

This paper reviews emerging evidence on TRP channels as therapeutic targets for osteoarthritis by highlighting their roles in cartilage homeostasis, synovial inflammation, and pain.

Findings

TRP channels modulate cartilage homeostasis through calcium signaling in chondrocytes.

TRP channels in synovial tissue regulate inflammation and joint destruction via cytokine production.

TRP channels in sensory neurons contribute to OA pain through increased nociceptor excitability.

Abstract

What are the main findings?
Transient receptor potential (TRP) channels serve as molecular sensors in chondrocytes, synoviocytes, and sensory neurons in the joint tissues.In osteoarthritis, TRP channels play a key role in modulating cartilage homeostasis, synovial inflammation, and pain sensitization through calcium-dependent signaling.

Transient receptor potential (TRP) channels serve as molecular sensors in chondrocytes, synoviocytes, and sensory neurons in the joint tissues.

In osteoarthritis, TRP channels play a key role in modulating cartilage homeostasis, synovial inflammation, and pain sensitization through calcium-dependent signaling.

What are the implications of the main findings?
Targeting TRP channels in specific tissues could lead to therapeutics that reduce osteoarthritis pain.Targeting TRP channels in specific tissues could lead to therapeutics that promote cartilage health.

Targeting TRP channels in specific tissues could lead to therapeutics that reduce osteoarthritis pain.

Targeting TRP channels in specific tissues could lead to therapeutics that promote cartilage health.

Osteoarthritis (OA) is a degenerative joint disease characterized by cartilage degradation, synovial inflammation, osteophyte formation, joint space narrowing, and persistent pain. During OA progression, synovial inflammation triggers the release of pro-inflammatory cytokines, including IL-1β, TNF-α, and IL-6, which activate matrix metalloproteinases (MMPs) and aggrecanases, driving extracellular matrix (ECM) degradation. Emerging evidence indicates that transient receptor potential (TRP) channels, via calcium (Ca2+) signaling, function as molecular sensors in joint tissues, including chondrocytes, synoviocytes, sensory neurons, and regulate cartilage homeostasis, synovial inflammation, and OA pain. In cartilage, TRP channels govern chondrocyte survival, mechanotransduction, autophagy, oxidative stress, and ECM turnover, thereby modulating cartilage homeostasis. In synovial tissue, TRP channels regulate inflammatory signaling and cytokine, chemokine, and matrix-degrading enzyme production, leading to synovitis and joint destruction. In sensory neurons innervating the joint, TRP channels respond to mechanical and inflammatory stimuli, increasing nociceptor excitability, neuropeptide release, and pain sensitization, driving OA pain. TRP channel signaling also modulates immune cell infiltration and macrophage-driven inflammation, sustaining chronic pain and tissue damage in OA. This review summarizes emerging evidence on TRP channel functions in OA pathogenesis and highlights their potential as therapeutic targets to alleviate inflammation, protect cartilage, and reduce OA-associated pain.

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