ArticleActa pharmacologica Sinica2009
Functional study of the effect of phosphatase inhibitors on KCNQ4 channels expressed in Xenopus oocytes.
Article in Acta pharmacologica Sinica, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
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- Action potential bursts in central snail neurons elicited by paeonol: roles of ionic currents.Acta pharmacologica Sinica · 2010Article
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9 authors.
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Abstract
aimKCNQ4 channels play an important part in adjusting the function of cochlear outer hair cells. The aim of this study was to investigate the effects of ser/thr phosphatase inhibitors on human KCNQ4 channels expressed in Xenopuslaevis oocytes.
methodsSynthetic cRNA encoding human KCNQ4 channels was injected into Xenopus oocytes. We used a two-electrode voltage clamp to measure the ion currents in the oocytes.
resultsWild-type KCNQ4 expressed in Xenopus oocytes showed the typical properties of slow activation kinetics and low threshold activation. The outward K(+) current was almost completely blocked by a KCNQ4 blocker, linopirdine (0.25 mmol/L). BIMI (a PKC inhibitor) prevented the effects of PMA (a PKC activator) on the KCNQ4 current, indicating that PKC may be involved in the regulation of KCNQ4 expressed in the Xenopus oocyte system. Treatment with the ser/thr phosphatase inhibitors, cyclosporine (2 micromol/L), calyculin A (2 micromol/L) or okadaic acid (1 micromol/L), caused a significant positive shift in V(1/2) and a decrease in the conductance of KCNQ4 channels. The V(1/2) was shifted from -14.6+/-0.5 to -6.4+/-0.4 mV by cyclosporine, -18.8+/-0.5 to -9.2+/-0.4 mV by calyculin A, and -14.1+/-0.5 to -0.7+/-0.6 mV by okadaic acid. Moreover, the effects of these phosphatase inhibitors (okadaic acid or calyculin A) on the induction of a positive shift of V(1/2) were augmented by further addition of PMA.
conclusionThese results indicate that ser/thr phosphatase inhibitors can induce a shift to more positive potentials of the activation curve of the KCNQ4 current. It is highly likely that the phosphatase functions to balance the phosphorylated state of substrate protein and thus has an important role in the regulation of human KCNQ4 channels expressed in Xenopus oocytes.
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