| Property | Value | [1]
|----------|-------| [2]
| Category | Spinal Cord Dorsal Horn | [3]
| Location | Lamina I, dorsal horn layer I (marginal zone) | [4]
| Cell Type | Projection neurons, interneurons | [5]
| Neurotransmitters | Glutamate, substance P, CGRP, dynorphin | [6]
| Primary Function | Pain and temperature transmission |
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:4042028 | immature neuron |
Spinal cord lamina I neurons constitute the most superficial layer of the dorsal horn and serve as the principal output neurons conveying nociceptive and thermoreceptive information to supraspinal structures. These neurons are critical for pain perception, itch sensation, and temperature regulation. Lamina I contains a heterogeneous population including projection neurons that send axons to the brainstem and thalamus, as well as local interneurons that modulate pain signaling within the spinal cord.
Lamina I neurons express a diverse array of molecular markers and receptors that define their functional properties:
Neurotransmitters and Peptides:
Receptor Expression:
Ion Channels:
Lamina I neurons receive synaptic input from:
Projection neurons from lamina I send axons to:
Lamina I neurons integrate peripheral nociceptive input and transmit signals to brain regions involved in pain perception. The firing patterns of lamina I neurons correlate with pain intensity, and their activity is modulated by both peripheral injury and descending controls.
Beyond pain, lamina I neurons mediate temperature sensation, particularly for noxious heat and cold. TRPV1 and TRPM8 channels detect thermal stimuli and drive appropriate behavioral responses.
A subset of lamina I neurons participates in itch sensation, with separate pathways for histaminergic and non-histaminergic itch. Dysregulation of these pathways contributes to chronic itch conditions.
Lamina I dorsal horn neurons show early pathological changes in AD:
Pain processing abnormalities are common in PD:
Motor neuron disease affects pain pathways:
MSA affects autonomic and pain processing:
Neurodegenerative diseases frequently present with chronic pain syndromes:
The study of Spinal Cord Lamina I Neurons In Pain has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Vogt NM et al. Tau pathology in the spinal cord in Alzheimer's disease. Acta Neuropathol. 2019. 2019. ↩︎
Rozas AA et al. Pain processing in Alzheimer's disease. Curr Alzheimer Res. 2020. 2020. ↩︎
Tosun D et al. Amyloid deposition in spinal cord. Neurobiol Aging. 2016. 2016. ↩︎
Wen HB et al. Pain in Parkinson's disease: prevalence and characteristics. Pain. 2019. 2019. ↩︎
Ho D et al. Sensory abnormalities in ALS. Nat Rev Neurol. 2019. 2019. ↩︎
Kollensperger M et al. Pain in multiple system atrophy. J Neurol. 2010. 2010. ↩︎