2007 | Jun-Ming Zhang, MSc, MD and Jianxiong An, MSc, MD
Cytokines are small secreted proteins that regulate cell interactions and communications. They include lymphokines, monokines, chemokines, and interleukins, with roles in both pro-inflammatory and anti-inflammatory responses. Pro-inflammatory cytokines like IL-1β, IL-6, and TNF-α are involved in pathological pain by activating nociceptive neurons and contributing to central sensitization and contralateral hyperalgesia. Anti-inflammatory cytokines such as IL-10 and TGF-β help counteract these effects. Chemokines, including MCP-1 and GRO/KC, also play roles in neuropathic pain by influencing leukocyte migration and activation. Glial activation in the central and peripheral nervous systems is crucial for pain development, with microglia and astrocytes releasing pro-inflammatory cytokines. Mechanisms involve cytokine-induced neuronal excitation, increased sensitivity to stimuli, and modulation of pain pathways. Anti-inflammatory cytokines and cytokine antagonists show promise for treating chronic pain by disrupting hyperexcitability in sensory neurons. This review highlights the complex roles of cytokines in pain pathways and potential therapeutic strategies.Cytokines are small secreted proteins that regulate cell interactions and communications. They include lymphokines, monokines, chemokines, and interleukins, with roles in both pro-inflammatory and anti-inflammatory responses. Pro-inflammatory cytokines like IL-1β, IL-6, and TNF-α are involved in pathological pain by activating nociceptive neurons and contributing to central sensitization and contralateral hyperalgesia. Anti-inflammatory cytokines such as IL-10 and TGF-β help counteract these effects. Chemokines, including MCP-1 and GRO/KC, also play roles in neuropathic pain by influencing leukocyte migration and activation. Glial activation in the central and peripheral nervous systems is crucial for pain development, with microglia and astrocytes releasing pro-inflammatory cytokines. Mechanisms involve cytokine-induced neuronal excitation, increased sensitivity to stimuli, and modulation of pain pathways. Anti-inflammatory cytokines and cytokine antagonists show promise for treating chronic pain by disrupting hyperexcitability in sensory neurons. This review highlights the complex roles of cytokines in pain pathways and potential therapeutic strategies.