PTP1B in dorsal root ganglion nociceptors drives neuropathic pain via a presynaptic Src/GluN2B signaling pathway.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model and mechanistic research
PubMed 42628984 · doi:10.1136/rapm-2026-107766
What was done
The authors investigated protein tyrosine phosphatase 1B (PTP1B) expression in dorsal root ganglion (DRG) nociceptors using peripheral nerve injury animal models. They evaluated pain-related behaviors, including mechanical allodynia and negative affect, following nociceptor-specific overexpression and targeted knockdown of PTP1B. Electrophysiological recordings of miniature excitatory postsynaptic currents (mEPSCs) and pharmacological inhibition targeting Src kinase and NMDA receptor GluN2B were performed to evaluate molecular mechanisms.
What was found
No numerical values, sample sizes, or effect sizes were provided in the abstract. Peripheral nerve injury led to sustained upregulation of PTP1B primarily in non-peptidergic DRG nociceptors. Nociceptor-specific PTP1B overexpression induced neuropathic pain-like behaviors, whereas PTP1B knockdown reversed established pain hypersensitivity. Mechanistically, PTP1B dephosphorylated Src at Tyr529, which increased GluN2B phosphorylation at Tyr1472 and elevated spinal dorsal horn mEPSCs. Pharmacological inhibition of GluN2B or Src largely reversed PTP1B-driven pain sensitization.
Why it matters
This study delineates a peripheral mechanism driving spinal nociceptive transmission, identifying PTP1B and the presynaptic Src/GluN2B axis as potential targets for neuropathic pain intervention.
Limits
This is entirely preclinical animal and cellular research, limiting direct translation to human clinical pain syndromes. The abstract does not report sample sizes, animal species, sex distribution, or quantitative statistical measures.
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