Alteration of cytosolic calcium levels in PC12 cells by potassium cyanide.

Abstract:

:The effect of KCN on cytosolic Ca2+ levels was measured in PC12 cells using Quin II/AM, a fluorometric calcium indicator. The resting cytosolic Ca2+ concentration, 115.0 +/- 4.9 nm, increased gradually and steadily over a 30-min time period following addition of 10(-4), 10(-3), or 10(-2)M KCN to the cells. After 15 min, 10(-3) and 10(-2)M KCN produced a three- and sixfold increase in the cytosolic Ca2+ concentration, respectively. In K+-depolarized cells, KCN induced a more rapid rise of intracellular calcium than in cells treated with KCN or KCI alone. KCN and/or K+-induced accumulation of cytosolic Ca2+ was blocked when the cells were pretreated with 10(-5)M diltiazem (a calcium channel blocker). These results demonstrate in a cell model that cyanide induces an accumulation of cytosolic Ca2+ and this additional cytosolic Ca2+ load appears to originate primarily from the extracellular compartment. This study supports previous reports implicating calcium as an intracellular mediator of cyanide toxicity.

journal_name

Toxicol Appl Pharmacol

authors

Johnson JD,Conroy WG,Isom GE

doi

10.1016/0041-008x(87)90007-x

subject

Has Abstract

pub_date

1987-04-01 00:00:00

pages

217-24

issue

2

eissn

0041-008X

issn

1096-0333

journal_volume

88

pub_type

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