Abstract
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 language | English |
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Pages (from-to) | 229-232 |
Number of pages | 4 |
Journal | FEBS Letters |
Volume | 303 |
Issue number | 2-3 |
DOIs | |
State | Published - 1 Jun 1992 |
Externally published | Yes |
Keywords
- Calcium
- Jurkat
- Kinase C
- Serotonin
- T cell