Regulation of a major cloned voltage-gated K+ channel from human T lymphocytes

Bernard Attali, Eric Honoré*, Florian Lesage, Michael Lazdunski, Jacques Barhanin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


When expressed into Xenopus oocytes, HLK3 K+ channel (Kvl-3) induced a slowly inactivating voltage-dependent K+ current. We have studied the modulation of this K+ current by co-expressing a cloned 5-HT2 receptor together with HLK3K+ channel protein. Application of 5-HT caused a long-lasting inhibition of the voltage-gated K+ current. This inhibitory modulation was mimicked by intracellular injection of inositol triphosphate or Ca2+, as well as by incubation with phorbol esters or diacylglycerol analogs. Oocytes pretreatment with staurosporine and EGTA fully prevented 5-HT inhibitory action. Elevation of cAMP and cGMP levels into oocytes did not produce any detectable effect on the current recorded in the absence or the presence of 5-HT. These data suggest that the second messengers generated by phospholipase C activation may be important modulators of HLK3 K+ channels in the immune and the central nervous systems.

Original languageEnglish
Pages (from-to)229-232
Number of pages4
JournalFEBS Letters
Issue number2-3
StatePublished - 1 Jun 1992
Externally publishedYes


  • Calcium
  • Jurkat
  • Kinase C
  • Serotonin
  • T cell


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