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XB-ART-9526
Pflugers Arch December 1, 2000; 441 (2-3): 257-62.
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Role of receptor protein tyrosine phosphatase alpha (RPTPalpha) and tyrosine phosphorylation in the serotonergic inhibition of voltage-dependent potassium channels.

Imbrici P , Tucker SJ , D'Adamo MC , Pessia M .


Abstract
The activity of voltage-gated potassium (Kv) channels can be dynamically modulated by several events, including neurotransmitter-stimulated biochemical cascades mediated by G-protein-coupled receptors. By using a heterologous expression system, we show that activating the 5-HT2C receptor inhibits both Kv1.1 and Kv1.2 channels through a tyrosine phosphorylation mechanism. The major molecular determinants of channel inhibition were identified as two tyrosine residues located in the N-terminal region of the Kv channel subunit. Furthermore, we demonstrate that receptor protein tyrosine phosphatase alpha (RPTPalpha), a receptor protein tyrosine phosphatase, co-ordinates the inhibition process mediated via 5-HT2C receptors. We therefore propose that the serotonergic regulation of human Kv1.1 and Kv1.2 channel activity by the 5-HT2C receptor involves the dual coordination of both RPTPalpha and specific tyrosine kinases coupled to this receptor.

PubMed ID: 11211111
Article link: Pflugers Arch
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: htr2c