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pHeeling the pHorce.

Sang-Min Jeon1, Michael J Caterina2

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Summary

Protons acting at acid-sensing ion channels (ASICs) transmit signals evoked by mechanical force. This fast excitatory neurotransmission at the Merkel cell-neurite complex is key for mammalian tactile discrimination.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Sensory Physiology

Background:

  • The Merkel cell-neurite complex is crucial for fine touch sensation in mammals.
  • The precise mechanisms of mechanotransduction in this complex are not fully understood.

Purpose of the Study:

  • To elucidate the role of proton signaling in mechanical force transduction at the Merkel cell-neurite complex.
  • To identify the specific ion channels involved in mediating tactile sensory information.

Main Methods:

  • Utilized electrophysiological recordings to measure neuronal activity.
  • Employed pharmacological agents to block acid-sensing ion channels (ASICs).
  • Investigated signaling pathways in the Merkel cell-neurite complex.

Main Results:

  • Demonstrated that protons act as fast excitatory neurotransmitters at the Merkel cell-neurite complex.
  • Showed that acid-sensing ion channels (ASICs) mediate the signaling evoked by mechanical force.
  • Confirmed the contribution of this pathway to mammalian tactile discrimination.

Conclusions:

  • Fast excitatory neurotransmission via ASICs is a critical component of mechanotransduction in Merkel cells.
  • This proton-mediated signaling pathway is essential for tactile sensory perception and discrimination in mammals.