• hASIC3

    measured on the
    SyncroPatch 384PE

  • hASIC3

    measured on the Patchliner

  • hASIC3

    block by amiloride
    recorded on the Patchliner

ASIC3 | acid-sensing Ion Channel 3

Acid-sension ion channels, member of the ENaC/Degenerin superfamily

Members and topology:
The channels are encoded by five genes: ASIC1 - ASIC5. ASIC1a,  ASIC1b, ASIC2a, ASIC2b are splice variants. Each subunit has 2 transmembrane domains flanking a large extracellular loop with short intracellular N and C termini. Three of these protein subunits assemble to form the ASIC ion channel, which can combine into both homotrimeric and heterotrimeric channels.

Regulation and function:
Neuronal voltage-insensitive cationic channels activated by extracellular protons. ASICs are Na+ permeable with ASIC1a showing low Ca2+ permeability. The role of the ASIC is to sense reduced levels of extracellular pH and result in a response or signal from the neuron.


ASIC3: Background information


Human Protein:
UniProt Q9UHC3

Primarily expressed in central and peripheral neurons including nociceptors where they participate in neuronal sensitivity to acidosis. Also present in taste receptor cells, photoreceptors and retinal cells, testis, lung epithelial cells, urothelial cells, adipose cells, vascular smooth muscle cells, immune cells and bone.

Function/ Application:
Somatic and visceral nociception, inflammatory pain

Ischaemic stroke, implicated in multiple sclerosis, Huntington’s disease, Parkinson’s disease and spinal cord injury

Accessory subunits:


Inhibitors: Amiloride, nafamostat mesilate, A-317567, APETx2, aspirin. Potentiators: FMRFa, MitTx

Patch Clamp: whole cell, room temperature, pH activation

Cell systems:
Stably-transfected HEK293 cell line (EMD Millipore)

Recommended Reviews:
WIREs Membr Transp Signal 2013, 2:155–171. doi: 10.1002/wmts.88, Lingueglia & Lazdunski; Pharmacology & Therapeutics 128 (2010) 549–558, Deval et al.; Nat Rev Neurosci. 2013, 14(7): 461–471. doi:10.1038/nrn3529, Wemmie et al.

Application Notes

ASIC3 - "Activation and Inhibition of human ASIC3 Channels on Nanion’s SyncroPatch 384PE"

icon sp96   SyncroPatch 384PE (a predecessor model of SyncroPatch 384i) application note:   logo pdf   (2.2 MB)
Cells were kindly provided by Millipore.  

ASIC3 - "Characterization of hASIC3 (HEK) on Nanion´s Patchliner"

icon pl   Patchliner application note:   logo pdf   (0.6 MB)
Cells were kindly provided by Millipore.



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