Abstract
Axonal K+ channels involved in normal spinal cord function are candidate targets for therapeutics, which improve sensorimotor function in spinal cord injury. To this end, we have investigated the expression, localization, and coassociation of Kv1 α and β subunits in human, rat, and bovine spinal cord. We find that Kv1.1, Kv1.2, and Kvβ2 form heteromultimeric complexes at juxtaparanodal zones in myelinated fibers. However, these same complexes are also present in paranodal regions of some spinal cord axons, and staining with antibodies against Caspr, a component of the paranodal axoglial junction, overlaps with these paranodal K+ channels. This latter observation suggests a unique role for these channels in normal spinal cord function and may provide an explanation for the sensitivity of spinal cord to K+ channel blockers. Moreover, the conservation of these characteristics between human, rat, and bovine nodes of Ranvier suggests an essential role for this defined channel complex in spinal cord function. (C) 2001 Wiley-Liss, Inc.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 166-176 |
| Number of pages | 11 |
| Journal | Journal of Comparative Neurology |
| Volume | 429 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2001 |
| Externally published | Yes |
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Keywords
- Caspr
- Kv1 K+ channels
- Myelin
- Na+ channels
- Node of Ranvier
- Spinal cord injury
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Subunit composition and novel localization of K+ channels in spinal cord. / Rasband, Matthew N.; Trimmer, James.
In: Journal of Comparative Neurology, Vol. 429, No. 1, 01.01.2001, p. 166-176.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Subunit composition and novel localization of K+ channels in spinal cord
AU - Rasband, Matthew N.
AU - Trimmer, James
PY - 2001/1/1
Y1 - 2001/1/1
N2 - Axonal K+ channels involved in normal spinal cord function are candidate targets for therapeutics, which improve sensorimotor function in spinal cord injury. To this end, we have investigated the expression, localization, and coassociation of Kv1 α and β subunits in human, rat, and bovine spinal cord. We find that Kv1.1, Kv1.2, and Kvβ2 form heteromultimeric complexes at juxtaparanodal zones in myelinated fibers. However, these same complexes are also present in paranodal regions of some spinal cord axons, and staining with antibodies against Caspr, a component of the paranodal axoglial junction, overlaps with these paranodal K+ channels. This latter observation suggests a unique role for these channels in normal spinal cord function and may provide an explanation for the sensitivity of spinal cord to K+ channel blockers. Moreover, the conservation of these characteristics between human, rat, and bovine nodes of Ranvier suggests an essential role for this defined channel complex in spinal cord function. (C) 2001 Wiley-Liss, Inc.
AB - Axonal K+ channels involved in normal spinal cord function are candidate targets for therapeutics, which improve sensorimotor function in spinal cord injury. To this end, we have investigated the expression, localization, and coassociation of Kv1 α and β subunits in human, rat, and bovine spinal cord. We find that Kv1.1, Kv1.2, and Kvβ2 form heteromultimeric complexes at juxtaparanodal zones in myelinated fibers. However, these same complexes are also present in paranodal regions of some spinal cord axons, and staining with antibodies against Caspr, a component of the paranodal axoglial junction, overlaps with these paranodal K+ channels. This latter observation suggests a unique role for these channels in normal spinal cord function and may provide an explanation for the sensitivity of spinal cord to K+ channel blockers. Moreover, the conservation of these characteristics between human, rat, and bovine nodes of Ranvier suggests an essential role for this defined channel complex in spinal cord function. (C) 2001 Wiley-Liss, Inc.
KW - Caspr
KW - Kv1 K+ channels
KW - Myelin
KW - Na+ channels
KW - Node of Ranvier
KW - Spinal cord injury
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UR - http://www.scopus.com/inward/citedby.url?scp=0035218139&partnerID=8YFLogxK
U2 - 10.1002/1096-9861(20000101)429:1<166::AID-CNE13>3.0.CO;2-Y
DO - 10.1002/1096-9861(20000101)429:1<166::AID-CNE13>3.0.CO;2-Y
M3 - Article
C2 - 11086297
AN - SCOPUS:0035218139
VL - 429
SP - 166
EP - 176
JO - Journal of Comparative Neurology
JF - Journal of Comparative Neurology
SN - 0021-9967
IS - 1
ER -