Differential inhibitory effects of carbon tetrachloride on the hepatic plasma membrane, mitochondrial and endoplasmic reticular calcium transport systems: implications to hepatotoxicity.

Abstract:

:Mitochondrial, endoplasmic reticular and plasma membrane fractions were isolated by a new method from control male Fischer 344 rats and rats given CCl4 by gavage. After 1 h of CCl4 treatment, rats were in glucose and pancreatic hormone balance but plasma levels of T3 and T4 were decreased 29 and 22%, respectively. After 24 hours of CCl4 treatment, rats were: hypoglycaemic and insulin and glucagon levels were increased 33- and 35-fold, respectively; total T4 levels were decreased 62%; while total T3 levels were normalized. In liver fractions from CCl4-treated rats, 1 h after CCl4 administration: (i) calcium binding was decreased 65% in the mitochondrial fraction, 66% in the endoplasmic reticular fraction and 46% in the plasma membrane fraction; (ii) calcium uptake was decreased 59% in the mitochondrial fraction, 46% in the endoplasmic reticular fraction and 37% in the plasma membrane fraction. After 24 h of CCl4 administration: (i) calcium binding was decreased 57% in the mitochondrial fraction, 50% in the endoplasmic reticular fraction and 71% in the plasma membrane fraction; (ii). calcium uptake was decreased 55% in the mitochondrial fraction, 17% in the endoplasmic reticular fraction and 53% in the plasma membrane fraction. In vitro studies indicated the plasma membrane calcium transport system to be rapidly (within a minute) and strongly (>90%) inhibited by CCl4. We conclude that CCl4 produces a differential inhibitory effect on the hepatocyte calcium pumps that are implicated with hepatocellular damage.

journal_name

Cell Biochem Funct

authors

Hemmings SJ,Pulga VB,Tran ST,Uwiera RR

doi

10.1002/cbf.934

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

47-59

issue

1

eissn

0263-6484

issn

1099-0844

pii

10.1002/cbf.934

journal_volume

20

pub_type

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