Cyclic GMP inhibits and shifts the activation curve of the delayed rectifier (I(K1)) of type I mammalian vestibular hair cells

O. Behrend, C. Schwark, Takanobu Kunihiro, M. Strupp

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

NITRIC oxide (NO) plays a role in the modulation of the predominant potassium current of type I vestibular hair cells, a low-voltage activated current called I(K1). Since many effects of NO are mediated via cGMP, patch- clamp recordings were made to evaluate the effects of cGMP on I(K1). In whole-cell recordings 1 mM cGMP shifted V(half) of I(K1) by 15.0 ± 2.4 mV (n = 6) to more positive. In cell-attached 'multichannel recordings 1 mM 8- bromo-cGMP caused a reversible shift of V(half) by 13.8 ± 2.6 mV (n = 12) and in single channel recordings in the cell-attached configuration the open probability was reduced at -60 mV from 0.39 ± 0.14 to 0.08 ± 0.01. cGMP had no effect on excised inside-out patches, indicating that an intact cytosolic milieu with functioning phosphorylation cascades is necessary. cGMP seems to be an important second messenger which reduces the potassium conductance of vestibular hair cells.

Original languageEnglish
Pages (from-to)2687-2690
Number of pages4
JournalNeuroReport
Volume8
Issue number12
Publication statusPublished - 1997

Fingerprint

Vestibular Hair Cells
Cyclic GMP
Oxides
Potassium
Second Messenger Systems
Patch-Clamp Techniques
Phosphorylation

Keywords

  • cGMP
  • Delayed-rectifier
  • Nitric oxide
  • Potassium channel
  • Rat
  • Vestibular hair cell

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Cyclic GMP inhibits and shifts the activation curve of the delayed rectifier (I(K1)) of type I mammalian vestibular hair cells. / Behrend, O.; Schwark, C.; Kunihiro, Takanobu; Strupp, M.

In: NeuroReport, Vol. 8, No. 12, 1997, p. 2687-2690.

Research output: Contribution to journalArticle

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AU - Strupp, M.

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