Cited by 38Pain Mechanisms and TreatmentsNeuroscience and Neuropharmacology ResearchIon Channels and Receptors

The DOI matches its Crossref record; 89 of the 89 references it cites were found in a registry or an index.

Postnatal maturation of spinal dynorphin circuits and their role in somatosensation

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Abstract

Inhibitory interneurons in the adult spinal dorsal horn (DH) can be neurochemically classified into subpopulations that regulate distinct somatosensory modalities. Although inhibitory networks in the rodent DH undergo dramatic remodeling over the first weeks of life, little is known about the maturation of identified classes of GABAergic interneurons, or whether their role in somatosensation shifts during development. We investigated age-dependent changes in the connectivity and function of prodynorphin (DYN)-lineage neurons in the mouse DH that suppress mechanosensation and itch during adulthood. In vitro patch clamp recordings revealed a developmental increase in primary afferent drive to DYN interneurons and a transition from exclusive C-fiber monosynaptic input to mixed A-fiber and C-fiber innervation. Although most adult DYN interneurons exhibited tonic firing as expected from their inhibitory phenotype, neonatal and adolescent DYN cells were predominantly classified as phasic or single-spiking. Importantly, we also found that most of the inhibitory presynaptic terminals contacting lamina I spinoparabrachial projection neurons (PNs) originate from DYN neurons. Furthermore, inhibitory synaptic input from DYN interneurons onto PNs was weaker during the neonatal period, likely reflecting a lower number of GABAergic terminals and a reduced probability of GABA release compared to adults. Finally, spinal DYN interneurons attenuated mechanical sensitivity throughout development, but this population dampened acute nonhistaminergic itch only during adulthood. Collectively, these findings suggest that the spinal “gates” controlling sensory transmission to the brain may emerge in a modality-selective manner during early life due to the postnatal tuning of inhibitory synaptic circuits within the DH.

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Crossref · 10.1097/j.pain.0000000000001884

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  • The Pdyn dorsal inhibitory family comprised Inhib-9, Inhib-10, and Inhib-11 and expressed markers suggestive of a role in chemical itch.

    “The Pdyn dorsal, inhibitory family was comprised of Inhib-9, Inhib-10, and Inhib-11 and expressed markers suggestive of a role in chemical itch52,61,73–77.”

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Metadata

Authors
Brewer, C. L., Styczynski, L. M., Serafin, E. K., & Baccei, M. L.
Affiliations
  • University of Cincinnati (US)
  • University of Cincinnati Medical Center (US)
Corresponding author
Baccei, Mark L.
Venue
Pain
Published
2020-04-01
Volume
161
Issue
8
Pages
1906-1924
ISSN
  • 0304-3959 (ISSN-L)
  • 1872-6623
OpenAlex
W3014548040
Cited by
38
References
89
Citations by year
2026: 3 · 2025: 8 · 2024: 6 · 2023: 9 · 2022: 3 · 2021: 8 · 2020: 1
FWCI
3.16
Type
journal article
Language
en
Open access
Locations
  • Pain (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Neurological Disorders and Stroke (R01NS080889)
Topics
  • Health Sciences › Medicine › Physiology (medical) › Pain Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
Keywords
dorsal horn, postnatal development, somatosensory perception, mechanosensing, GABAergic inhibition, presynaptic inhibition, sensory gating
MeSH terms
Animals, Dynorphins, Female, Interneurons, Male, Nerve Fibers, Myelinated, Posterior Horn Cells, Nerve Fibers, Unmyelinated, Mice, Spinal Cord Dorsal Horn

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