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Role of ion channels and intraterminal calcium homeostasis in the action of deltamethrin at presynaptic nerve terminals.

Abstract：

:Using a continuous perfusion system, synaptosomes prepared from rat brain released [3H]norepinephrine in a Ca2+-dependent manner when pulse depolarized by briefly elevating external potassium concentrations. Tetrodotoxin (10(-7) M), a sodium channel blocker, inhibited 48% of this pulsed release, and D595 (10(-5) M), a phenethylamine-type calcium channel blocker, inhibited 21%. In combination, these two specific ion channel antagonists appear to function independently of each other in an additive fashion. Addition of deltamethrin to this preparation resulted in an enhanced release of [3H]norepinephrine which occurred in a biphasic fashion. At 10(-7) M, deltamethrin produced a 42% enhancement in the first or initial peak of [3H]norepinephrine release and a 100% enhancement in the second or tailing peak. Addition of deltamethrin to tetrodotoxin-pretreated synaptosomes resulted in a net 37% enhancement of the initial peak release and a net increase of 277% in the tailing peak. Addition of deltamethrin to D595-pretreated synaptosomes produced no significant effect on enhanced [3H]norepinephrine release from either peak. Since tetrodotoxin is a specific sodium channel blocker, deltamethrin may be enhancing [3H]norepinephrine release by increasing the uptake of Ca2 via other voltage-gated channels (e.g. calcium) or exchange mechanisms in addition to its action at voltage-gated sodium channels. To determine whether deltamethrin may also have an effect on intraterminal Ca2+ homeostasis, external Ca2+ was replaced with Ba2+ and synaptosomes were depolarized with pentylenetetrazole (PTZ). At 10(-5) M, deltamethrin produced a 66% increase in neurotransmitter release over that produced by PTZ alone. An estimated EC50 value of deltamethrin for PTZ-induced release was calculated to be 2.4 x 10(-10) M.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Clark JM,Brooks MW

doi

10.1016/0006-2952(89)90460-7

subject

Has Abstract

pub_date

1989-07-15 00:00:00

pages

2233-45

issue

14

eissn

0006-2952

issn

1873-2968

pii

0006-2952(89)90460-7

journal_volume

38

pub_type

杂志文章

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