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Study on the possible involvement of protein kinases in the modulation of brain presynaptic sodium channels; comparison with calcium channels.

Abstract：

:A possible modulatory role of kinases on voltage sensitive Na+ channels of presynaptic brain nerve endings was investigated by testing the effect of several kinase activators and inhibitors on the elevation of [Nai] induced by veratridine in mouse brain synaptosomes loaded with a selective Na+ indicator dye. Veratridine (20 microM) increases the basal [Nai] level (20 mM) more than twofold. This increase is independent of external Ca2+, but abolished by tetrodotoxin (1 microM). Activation of cAMP dependent protein kinase with forskolin or cAMP analogs, or of protein kinase C with diacylglycerol did not affect the veratridine-induced elevation in [Nai]. Drugs reported to inhibit calmodulin-dependent events, as well as the regulatory domain of protein kinase C, were potent and effective inhibitors of the increase in [Nai] induced by veratridine, as well as other veratridine induced responses, namely elevation of [Cai] (monitored with the Ca2+ indicator dye fura-2) and neurotransmitter (GABA) release. Drugs that inhibit kinases by binding to the catalytic site were ineffective, however, as was the phosphatase inhibitor, okadaic acid. A selective inhibitor of Ca2+ and calmodulin dependent protein kinase II also did not affect the elevation of [Nai] induced by veratridine, but markedly diminished the elevation of [Cai] induced by depolarization either with veratridine or with high K+ (15 and 30 mM). On the basis of these results it is concluded that, the dramatic inhibition exerted by some of the drugs tested on the elevation of [Nai] induced by veratridine is not due to their effects on kinases, but to a possible interaction of these compounds with an intracellular site of the Na+ channel. On the other hand, while Ca2+ and calmodulin dependent protein kinase II is unable to modulate brain presynaptic voltage sensitive Na+ channels, it facilitates the activation of brain presynaptic voltage sensitive Ca2+ channels.

journal_name

Neurochem Int

journal_title

Neurochemistry international

authors

Sitges M,Peña F,Chiu LM,Guarneros A

doi

10.1016/s0197-0186(97)00065-x

subject

Has Abstract

pub_date

1998-02-01 00:00:00

pages

177-90

issue

2

eissn

0197-0186

issn

1872-9754

pii

S019701869700065X

journal_volume

32

pub_type

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