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The Journal of Neuroscience, April 15, 2001, 21(8):2678-2686
Transport and Localization of the DEG/ENaC Ion Channel BNaC1
to Peripheral Mechanosensory Terminals of Dorsal Root Ganglia
Neurons
Jaime
García-Añoveros1,
Tarek
A.
Samad2,
Ljiljana
uvela-Jelaska1,
Clifford J.
Woolf2, and
David P.
Corey1
1 Howard Hughes Medical Institute and Department of
Neurobiology, Massachusetts General Hospital and Harvard Medical
School, Boston, Massachusetts 02114, and 2 Neural
Plasticity Research Group, Department of Anesthesia and Critical Care,
Massachusetts General Hospital and Harvard Medical School, Charlestown,
Massachusetts 02129
Mammalian brain sodium channel (BNaC, also known as BNC/ASIC)
proteins form acid-sensitive and amiloride-blockable sodium channels
that are related to putative mechanosensory channels. Certain BNaC
isoforms are expressed exclusively in dorsal root ganglia (DRG)
and have been proposed to form the ion channels mediating tissue
acidosis-induced pain. With antibody labeling, we find that the
BNaC1 isoform is expressed by most large DRG neurons (low-threshold
mechanosensors not involved in acid-induced nociception) and few small
nociceptor neurons (which include high-threshold mechanoreceptors).
BNaC1 is transported from DRG cell bodies to sensory terminals in
the periphery, but not to the spinal cord, and is located specifically
at specialized cutaneous mechanosensory terminals, including Meissner,
Merkel, penicillate, reticular, lanceolate, and hair follicle palisades
as well as some intraepidermal and free myelinated nerve endings.
Accordingly, BNaC1 channels might participate in the transduction of
touch and painful mechanical stimuli.
Key words:
DEG/ENaC channels; mechanosensory; mechanotransduction; touch; nociception; dorsal root ganglion; unidirectional transport; degenerin
Copyright © 2001 Society for Neuroscience 0270-6474/01/2182678-09$05.00/0
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