Keratinocytes Communicate with Sensory Neurons via Synaptic‐like Contacts

Objective Pain, temperature, and itch are conventionally thought to be exclusively transduced by the intraepidermal nerve endings. Although recent studies have shown that epidermal keratinocytes also participate in sensory transduction, the mechanism underlying keratinocyte communication with intrae...

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Veröffentlicht in:Annals of neurology 2020-12, Vol.88 (6), p.1205-1219
Hauptverfasser: Talagas, Matthieu, Lebonvallet, Nicolas, Leschiera, Raphael, Sinquin, Gerard, Elies, Philippe, Haftek, Marek, Pennec, Jean‐Pierre, Ressnikoff, Denis, La Padula, Veronica, Le Garrec, Raphaele, L'herondelle, Killian, Mignen, Olivier, Le Pottier, Laetitia, Kerfant, Nathalie, Reux, Alexia, Marcorelles, Pascale, Misery, Laurent
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container_end_page 1219
container_issue 6
container_start_page 1205
container_title Annals of neurology
container_volume 88
creator Talagas, Matthieu
Lebonvallet, Nicolas
Leschiera, Raphael
Sinquin, Gerard
Elies, Philippe
Haftek, Marek
Pennec, Jean‐Pierre
Ressnikoff, Denis
La Padula, Veronica
Le Garrec, Raphaele
L'herondelle, Killian
Mignen, Olivier
Le Pottier, Laetitia
Kerfant, Nathalie
Reux, Alexia
Marcorelles, Pascale
Misery, Laurent
description Objective Pain, temperature, and itch are conventionally thought to be exclusively transduced by the intraepidermal nerve endings. Although recent studies have shown that epidermal keratinocytes also participate in sensory transduction, the mechanism underlying keratinocyte communication with intraepidermal nerve endings remains poorly understood. We sought to demonstrate the synaptic character of the contacts between keratinocytes and sensory neurons and their involvement in sensory communication between keratinocytes and sensory neurons. Methods Contacts were explored by morphological, molecular, and functional approaches in cocultures of epidermal keratinocytes and sensory neurons. To interrogate whether structures observed in vitro were also present in the human epidermis, in situ correlative light electron microscopy was performed on human skin biopsies. Results Epidermal keratinocytes dialogue with sensory neurons through en passant synaptic‐like contacts. These contacts have the ultrastructural features and molecular hallmarks of chemical synaptic‐like contacts: narrow intercellular cleft, keratinocyte synaptic vesicles expressing synaptophysin and synaptotagmin 1, and sensory information transmitted from keratinocytes to sensory neurons through SNARE‐mediated (syntaxin1) vesicle release. Interpretation By providing selective communication between keratinocytes and sensory neurons, synaptic‐like contacts are the hubs of a 2‐site receptor. The permanent epidermal turnover, implying a specific en passant structure and high plasticity, may have delayed their identification, thereby contributing to the long‐held concept of nerve endings passing freely between keratinocytes. The discovery of keratinocyte–sensory neuron synaptic‐like contacts may call for a reassessment of basic assumptions in cutaneous sensory perception and sheds new light on the pathophysiology of pain and itch as well as the physiology of touch. ANN NEUROL 2020;88:1205–1219
doi_str_mv 10.1002/ana.25912
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Although recent studies have shown that epidermal keratinocytes also participate in sensory transduction, the mechanism underlying keratinocyte communication with intraepidermal nerve endings remains poorly understood. We sought to demonstrate the synaptic character of the contacts between keratinocytes and sensory neurons and their involvement in sensory communication between keratinocytes and sensory neurons. Methods Contacts were explored by morphological, molecular, and functional approaches in cocultures of epidermal keratinocytes and sensory neurons. To interrogate whether structures observed in vitro were also present in the human epidermis, in situ correlative light electron microscopy was performed on human skin biopsies. Results Epidermal keratinocytes dialogue with sensory neurons through en passant synaptic‐like contacts. These contacts have the ultrastructural features and molecular hallmarks of chemical synaptic‐like contacts: narrow intercellular cleft, keratinocyte synaptic vesicles expressing synaptophysin and synaptotagmin 1, and sensory information transmitted from keratinocytes to sensory neurons through SNARE‐mediated (syntaxin1) vesicle release. Interpretation By providing selective communication between keratinocytes and sensory neurons, synaptic‐like contacts are the hubs of a 2‐site receptor. The permanent epidermal turnover, implying a specific en passant structure and high plasticity, may have delayed their identification, thereby contributing to the long‐held concept of nerve endings passing freely between keratinocytes. The discovery of keratinocyte–sensory neuron synaptic‐like contacts may call for a reassessment of basic assumptions in cutaneous sensory perception and sheds new light on the pathophysiology of pain and itch as well as the physiology of touch. 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Although recent studies have shown that epidermal keratinocytes also participate in sensory transduction, the mechanism underlying keratinocyte communication with intraepidermal nerve endings remains poorly understood. We sought to demonstrate the synaptic character of the contacts between keratinocytes and sensory neurons and their involvement in sensory communication between keratinocytes and sensory neurons. Methods Contacts were explored by morphological, molecular, and functional approaches in cocultures of epidermal keratinocytes and sensory neurons. To interrogate whether structures observed in vitro were also present in the human epidermis, in situ correlative light electron microscopy was performed on human skin biopsies. Results Epidermal keratinocytes dialogue with sensory neurons through en passant synaptic‐like contacts. These contacts have the ultrastructural features and molecular hallmarks of chemical synaptic‐like contacts: narrow intercellular cleft, keratinocyte synaptic vesicles expressing synaptophysin and synaptotagmin 1, and sensory information transmitted from keratinocytes to sensory neurons through SNARE‐mediated (syntaxin1) vesicle release. Interpretation By providing selective communication between keratinocytes and sensory neurons, synaptic‐like contacts are the hubs of a 2‐site receptor. The permanent epidermal turnover, implying a specific en passant structure and high plasticity, may have delayed their identification, thereby contributing to the long‐held concept of nerve endings passing freely between keratinocytes. The discovery of keratinocyte–sensory neuron synaptic‐like contacts may call for a reassessment of basic assumptions in cutaneous sensory perception and sheds new light on the pathophysiology of pain and itch as well as the physiology of touch. 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source MEDLINE; Wiley Online Library Journals Frontfile Complete
subjects Adult
Aged
Animals
Coculture Techniques
Communication
Electron microscopy
Epidermis
Epidermis - innervation
Female
Human performance
Humans
Keratinocytes
Keratinocytes - metabolism
Keratinocytes - ultrastructure
Life Sciences
Male
Microscopy, Electron
Middle Aged
Nerve endings
Neurons
Pain
Qa-SNARE Proteins - metabolism
Rats
Sensory neurons
Sensory perception
Sensory Receptor Cells - ultrastructure
Sensory transduction
SNAP receptors
Synapses - ultrastructure
Synaptic vesicles
Synaptic Vesicles - metabolism
Synaptophysin
Synaptophysin - metabolism
Synaptotagmin
Synaptotagmin I - metabolism
title Keratinocytes Communicate with Sensory Neurons via Synaptic‐like Contacts
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