Lamina I Neurons

Lamina I Neurons

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Lamina I Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0009007](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0009007)</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Lamina I Projection Neurons</td>
</tr>
<tr>
<td class="label">Location</td>
<td>Spinal Cord Dorsal Horn, Lamina I</td>
</tr>
<tr>
<td class="label">Morphology</td>
<td>Multipolar, dendrites in laminae I-II</td>
</tr>
<tr>
<td class="label">Neurotransmitter</td>
<td>Glutamate, often with peptides (Substance P, CGRP)</td>
</tr>
<tr>
<td class="label">Marker Genes</td>
<td>NK1R (Substance P receptor), CGRP, Tac1</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">NK1R (TACR1)</td>
<td>High</td>
</tr>
<tr>
<td class="label">Tac1</td>
<td>High</td>
</tr>
<tr>
<td class="label">PENK</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">PDYN</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Target</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">NK1R Antagonists</td>
<td>Block Substance P signaling</td>
</tr>
<tr>
<td class="label">CGRP Antagonists</td>
<td>Migraine and pain treatment</td>
</tr>
<tr>
<td class="label">TRPV1

...

Lamina I Neurons

<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">Lamina I Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0009007](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0009007)</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Lamina I Projection Neurons</td>
</tr>
<tr>
<td class="label">Location</td>
<td>Spinal Cord Dorsal Horn, Lamina I</td>
</tr>
<tr>
<td class="label">Morphology</td>
<td>Multipolar, dendrites in laminae I-II</td>
</tr>
<tr>
<td class="label">Neurotransmitter</td>
<td>Glutamate, often with peptides (Substance P, CGRP)</td>
</tr>
<tr>
<td class="label">Marker Genes</td>
<td>NK1R (Substance P receptor), CGRP, Tac1</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">NK1R (TACR1)</td>
<td>High</td>
</tr>
<tr>
<td class="label">Tac1</td>
<td>High</td>
</tr>
<tr>
<td class="label">PENK</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">PDYN</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Target</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">NK1R Antagonists</td>
<td>Block Substance P signaling</td>
</tr>
<tr>
<td class="label">CGRP Antagonists</td>
<td>Migraine and pain treatment</td>
</tr>
<tr>
<td class="label">TRPV1 Modulators</td>
<td>Thermal pain modulation</td>
</tr>
</table>

Introduction

Lamina I Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Lamina I neurons are the most superficial neurons in the spinal cord dorsal horn, constituting the first layer of the Rexed laminae organization. These neurons are critical for transmitting nociceptive (pain), thermoreceptive, and some mechanoreceptive information to higher brain centers. Lamina I neurons are also known as the marginal layer due to their position at the dorsal horn's outer margin. [@todd2010]

<!-- multi-taxonomy-enrichment -->

Multi-Taxonomy Classification

Taxonomy Database Cross-References

External Database Links

• [Cell Ontology (CL:0009007)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0009007)
• [OBO Foundry (CL:0009007)](http://purl.obolibrary.org/obo/CL_0009007)
• [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
• [CellxGene Census](https://cellxgene.cziscience.com/)
• [Human Cell Atlas](https://www.humancellatlas.org/)

Cell Type Information

Normal Function

Pain Transmission

Lamina I neurons are the primary output neurons for pain signaling:

• Nociception: Receive input from Aδ and C fiber nociceptors
• Thermal Sensation: Process temperature information
• Integration: Integrate multiple sensory modalities

Projection Pathways

• Spinothalamic Tract: Major pathway to thalamus
• Spinoreticular Pathway: Projects to brainstem reticular formation
• Spinoparabrachial Pathway: Projects to parabrachial nucleus

Neural Circuitry

• Input: Aδ (fast pain) and C (slow pain) fiber afferents
• Integration: Receive inhibitory modulation from lamina II
• Output: Project to brainstem and thalamic nuclei

Morphology and Markers

Morphological Features

• Soma Size: Medium to large (20-35 μm diameter)
• Dendritic Arborization: Extensive in laminae I-II
• Axon: Long projection axons ascending in spinal tracts
• Synaptic Inputs: Both excitatory and inhibitory

Molecular Markers

• NK1R: Substance P receptor - key marker for projection neurons
• Tac1: Preprotachykinin A gene - precursor for Substance P
• CGRP: Calcitonin Gene-Related Peptide
• TRPV1: Capsaicin receptor for thermal nociception

Disease Vulnerability

Amyotrophic Lateral Sclerosis (ALS)

• Vulnerability: Early involvement of pain pathways
• Mechanism: Degeneration of dorsal horn neurons
• Evidence: Reduced lamina I neuron function in ALS

Multiple System Atrophy (MSA)

• Pain Dysregulation: Altered pain perception
• Autonomic Integration: Lamina I contributes to autonomic reflexes

Parkinson's Disease

• Pain Processing: Altered pain thresholds in PD
• Mechanism: Dopaminergic modulation of pain pathways

Chronic Pain Conditions

• Neuropathic Pain: Lamina I hyperexcitability
• Fibromyalgia: Altered pain processing
• Complex Regional Pain Syndrome: Pain pathway dysfunction

Transcriptomic Profile

Key Marker Genes

Differentially Expressed Genes

• Pain Signaling: Upregulated in chronic pain states
• Neuroinflammation: Microglial markers near lamina I
• Synaptic Plasticity: Genes involved in sensitization

Therapeutic Implications

Pain Management Targets

Neuromodulation

• Dorsal Root Ganglion Stimulation: Targets pain afferents
• Spinal Cord Stimulation: Modulates dorsal horn activity
• Motor Cortex Stimulation: Affects pain perception

Research Directions

Pain Circuit Mapping: Detailed connectivity studies

Optogenetics: Mapping pain pathways with light

Single-Cell RNAseq: Characterizing lamina I neuron subtypes

Pain Biomarkers: Developing objective pain measures

Key Publications

Craig AD, et al. (2002). Lamina I nociceptive neurons: physiology and pathophysiology. Prog Brain Res. PMID: 12433367(https://pubmed.ncbi.nlm.nih.gov/12433367/)

Todd AJ, et al. (2010). Lamina I neurons expressing NK1R. J Comp Neurol. PMID: 20506479(https://pubmed.ncbi.nlm.nih.gov/20506479/)

Braz J, et al. (2014). Transmitting pain and itch signals. Annu Rev Neurosci. PMID: 24905535(https://pubmed.ncbi.nlm.nih.gov/24905535/)

Ma Q, et al. (2020). Lamina I projection neurons in pain and itch. Nat Rev Neurosci. PMID: 32877965(https://pubmed.ncbi.nlm.nih.gov/32877965/)

See Also

• [Spinal Cord Dorsal Horn
• [Pain Pathways](/mechanisms/pain-pathways-neurodegeneration)
• [Nociception](/mechanisms/spinal-cord-dorsal-horn](/content/mechanisms)

--pain-pathways
--nociception)

• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
• [Chronic Pain](/cell-types/spinal-cord-interneurons-chronic-pain)

External Links

• [Allen Brain Atlas: Lamina I](https://portal.brain-map.org/)
• [Human Spinal Cord Anatomy](https://www.neuroanatomy.us/spinal-cord.html)
• [Pain Research](https://www.painresearchforum.org/)

Background

The study of Lamina I Neurons 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.

Pathway Diagram

The following diagram shows the key molecular relationships involving Lamina I Neurons discovered through SciDEX knowledge graph analysis:

Pathway Diagram

The following diagram shows the key molecular relationships involving Lamina I Neurons discovered through SciDEX knowledge graph analysis: