Pflügers Archiv

, Volume 451, Issue 3, pp 454–463 | Cite as

Pharmacological properties of neuronal TTX-resistant sodium channels and the role of a critical serine pore residue

  • Andreas Leffler
  • Raimund I. Herzog
  • Sulayman D. Dib-Hajj
  • Stephen G. Waxman
  • Theodore R. Cummins
Ion Channels, Transporters

Abstract

Voltage-gated sodium channels can be characterized by their sensitivity to inhibitors. Nav1.5 is sensitive to block by cadmium and extracellular QX-314, but relatively insensitive to tetrodotoxin and saxitoxin. Nav1.4 is tetrodotoxin- and saxitoxin-sensitive but resistant to cadmium and extracellular QX-314. Nav1.8 and Nav1.9 generate slowly inactivating (ITTXr-Slow) and persistent (ITTXr-Per) currents in sensory neurons that are tetrodotoxin-resistant. Tetrodotoxin sensitivity is largely determined by the identity of a single residue; tyrosine 401 in Nav1.4, cysteine 374 in Nav1.5 and serine 356 and 355 in Nav1.8 and Nav1.9. We asked whether Nav1.8 and Nav1.9 share other pharmacological properties as a result of this serine residue. ITTXr-Slow and ITTXr-Per were saxitoxin-resistant and resistant to internal QX-314. ITTXr-Slow was also resistant to external QX-314 and displayed a approximately fourfold higher sensitivity than ITTXr-Per to cadmium. The impact of the serine residue was investigated by replacing tyrosine 401 in Nav1.4 with serine (Y401S) or cysteine (Y401C). Both mutants were resistant to tetrodotoxin and saxitoxin. Whereas Nav1.4-Y401C displayed an increased sensitivity to cadmium and extracellular QX-314, the serine substitution did not alter the sensitivity of Nav1.4 to cadmium or QX-314. Our data indicates that while the serine residue determines the sensitivity of ITTXr-Slow and ITTXr-Per to tetrodotoxin and saxitoxin, it does not determine their insensitivity to QX-314 or their differential sensitivities to cadmium.

Keywords

Sodium channel antagonist Sodium current Saxitoxin Tetrodotoxin Tetrodotoxin-resistant channels Sodium channel 

Abbreviations

Nav1.4

Voltage-gated sodium channel α-subunit from skeletal muscle

Nav1.8

SNS or PN3

Nav1.9

NaN or SNS2

NGF

Nerve growth factor

BDNF

Brain-derived neurotrophic factor

NT4/5

Neurotrophin 4/5

TrkB

Tyrosine kinase B

TTX

tetrodotoxin

STX

Saxitoxin

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Andreas Leffler
    • 1
  • Raimund I. Herzog
    • 2
  • Sulayman D. Dib-Hajj
    • 2
  • Stephen G. Waxman
    • 2
  • Theodore R. Cummins
    • 3
  1. 1.Klinik für AnästhesiologieFriedrich-Alexander-Universität Erlangen-NurembergErlangenGermany
  2. 2.Department of NeurologyYale University School of MedicineNew HavenUSA
  3. 3.Department of Pharmacology and ToxicologyStark Neurosciences Research Center, Indiana University School of MedicineIndianapolisUSA

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