Effects of norepinephrine and β2 receptor antagonist ICI 118,551 on whisker hair follicle mechanoreceptors dissatisfy Merkel discs being adrenergic synapses. View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Mayumi Sonekatsu, Steven Lawrence Gu, Hirosato Kanda, Jianguo G Gu

ABSTRACT

Merkel discs, located in skin touch domes and whisker hair follicles, are tactile end organs essential for environmental exploration, social interaction, and tactile discrimination. Recent studies from our group and two others have shown that mechanical stimulation excites Merkel cells via Piezo2 channel activation to subsequently activate sensory neural pathways. We have further shown that mechanical stimulation leads to the release of 5-HT from Merkel cells to synaptically transmit tactile signals to whisker afferent nerves. However, a more recent study using skin touch domes has raised the possibility that Merkel discs are adrenergic synapses. It was proposed that norepinephrine is released from Merkel cells upon mechanical stimulation to subsequently activate β2 adrenergic receptors on Merkel disc nerve endings leading to nerve impulses. In the present study, we examined effects of norepinephrine and β2 adrenergic receptor antagonist ICI 118,551 on Merkel disc mechanoreceptors in mouse whisker hair follicles. We show that norepinephrine did not directly induce impulses from Merkel disc mechanoreceptors. Furthermore, we found that ICI 118,551 at 50 μM inhibited voltage-gated Na+ channels and suppressed impulses of Merkel disc mechanoreceptors, but ICI 118,551 at 1 μM had no effects on the impulse. These findings challenge the hypothesis of Merkel discs being adrenergic synapses. More... »

PAGES

31

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s13041-019-0450-7

DOI

http://dx.doi.org/10.1186/s13041-019-0450-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1113181843

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30943999


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