Neuropathic Pain Mechanisms and Treatment Strategies

Neuropathic pain arises from lesions or diseases affecting the somatosensory system and manifests as spontaneous pain, allodynia and hyperalgesia. Peripheral sensitisation is driven by altered expression and function of ion channels in injured sensory fibres, whereas central sensitisation reflects enhanced excitatory transmission and diminished inhibition within dorsal horn circuits. Neuroimmune interactions play a critical role: activated microglia, macrophages and infiltrating monocytes release proinflammatory mediators that perpetuate neuronal hyperexcitability. Molecular pathways implicated include p38 MAP kinase signalling, cytokine and chemokine cascades, and dysregulated growth factor signalling. Current pharmacological options—gabapentinoids, serotonin–noradrenaline reuptake inhibitors and tricyclic antidepressants—offer limited relief for many patients. Emerging strategies focus on targeting specific ion channels, neuroimmune interfaces and receptor subunits, with an emphasis on therapies that combine multimodal actions to restore normal sensory processing. Advances in gene-targeted tools, refined animal models and translational biomarkers are refining our understanding of disease heterogeneity and guiding personalised therapeutic development.

Research from Nature Portfolio

Recent studies have illuminated the peripheral contributions of immune cells within dorsal root ganglia (DRG). One key investigation demonstrated that resident macrophages in DRG proliferate after nerve injury and directly modulate the emergence and persistence of mechanical hypersensitivity. Depleting these macrophages attenuates both the onset and maintenance of pain, underscoring their role as a therapeutic target distinct from central microglia. Complementary work has shown that resident microglia within the spinal cord and circulating monocytes act in concert at early stages of nerve injury to initiate mechanical allodynia and thermal hyperalgesia. Transient depletion experiments revealed that either cell population alone can gate the transition from acute to chronic pain, highlighting redundancy in neuroimmune interactions and suggesting that combination strategies may be necessary to prevent chronicity.

Neuropathic Pain Mechanisms and Treatment Strategies publication trend

The graph below shows the total number of articles in neuropathic pain mechanisms and treatment strategies across all publications each year (not limited to Nature Index journals).

Technical terms

Neuropathic pain: Pain arising from damage or disease affecting the somatosensory nervous system.

Allodynia: Pain due to a stimulus that does not normally provoke pain, often light touch.

Hyperalgesia: An increased response to a stimulus that is normally painful.

Dorsal root ganglion (DRG): A cluster of sensory neuron cell bodies located in the dorsal root of a spinal nerve.

Microglia: Resident immune cells of the central nervous system that respond to injury by releasing proinflammatory mediators.

Central sensitisation: Enhanced excitability of neurons in the central nervous system leading to pain amplification.

References

1. A mouse DRG genetic toolkit reveals morphological and physiological diversity of somatosensory neuron subtypes. Cell (2024).
2. Endophilin A2 controls touch and mechanical allodynia via kinesin-mediated Piezo2 trafficking. Military Medical Research (2024).
3. Mechanisms of Chemotherapy-Induced Peripheral Neuropathy. International Journal of Molecular Sciences (2019).
4. Etiology and Pharmacology of Neuropathic Pain. Pharmacological Reviews (2018).
5. Cytokines and Chemokines at the Crossroads of Neuroinflammation, Neurodegeneration, and Neuropathic Pain. Mediators of Inflammation (2013).
6. p38 MAPK, Microglial Signaling, and Neuropathic Pain. Molecular Pain (2007).
7. Dorsal root ganglion macrophages contribute to both the initiation and persistence of neuropathic pain. Nature Communications (2020).
8. Microglia and monocytes synergistically promote the transition from acute to chronic pain after nerve injury. Nature Communications (2016).
9. Dorsal Horn Circuits for Persistent Mechanical Pain. Neuron (2015).