Abstract：
:In identified B6 neurons of Aplysia buccal ganglia under voltage-clamp, application of quisqualic acid (QA) induces a unique slow K(+)-current response independent of G-protein. The response was augmented by raising the temperature in a similar fashion to the Phe-Met-Arg-Phe-NH(2)-induced K(+)-current response mediated by Gi/o. The QA-induced K(+)-current response markedly increased during the perfusion with Ca(2+)-free solution or after the application of W-7, a calmodulin (CaM) inhibitor. It was also enhanced by intracellular application either of H-7, a serine/threonine protein kinase inhibitor, or of KN-93, a Ca(2+)/CaM-dependent kinase II (CaMKII) inhibitor. Furthermore, the QA-induced response was markedly augmented by pre-treatment with 2,3-butanedione monoxime, an inorganic phosphatase. Intracellular application of protein phosphatase 2A (PP2A) significantly augmented the QA-induced response although neither protein phosphatase 1 nor protein phosphatase 2B altered the response. Application of either okadaic acid or calyculin A, protein phosphatase inhibitors, only slightly depressed the QA-induced response. Surprisingly, W-7 had no augmenting effect on the QA-induced response when examined after the application of either okadaic acid or calyculin A. These results suggest that the K(+)-current response is reciprocally but sequentially regulated by PP2A and CaMKII, the response of which the former is facilitating and the latter is inhibiting.
journal_name
Neurosci Resjournal_title
Neuroscience researchauthors
Kimura S,Kawasaki S,Watanabe S,Fujita R,Sasaki Kdoi
10.1016/j.neures.2007.09.007subject
Has Abstractpub_date
2008-01-01 00:00:00pages
73-81issue
1eissn
0168-0102issn
1872-8111pii
S0168-0102(07)01788-9journal_volume
60pub_type
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