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Main Title Aluminum Alters Calcium Transport in Plasma Membrane and Endoplasmic Reticulum from Rat Brain.
Author Mundy, W. R. ; Kodavanti, P. R. S. ; Dulchinos, V. F. ; Tilson., H. A. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC. Neurotoxicology Div.
Publisher c1994
Year Published 1994
Report Number EPA/600/J-94/200;
Stock Number PB94-163797
Additional Subjects Aluminum ; Calcium ; Biological transport ; Brain ; Endoplasmic reticulum ; Toxicity ; Reprint ; Ca(2+) Mg(2+)-ATPase ; Rats ; Microsomes ; Synaptosomes ; Homeostasis ; Signal transduction ; Cell membrane ;
Library Call Number Additional Info Location Last
NTIS  PB94-163797 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Calcium is actively transported into intracellular organelles and out of the cytoplasm by Ca(2+)/Mg(2+)-ATPases located in the endoplasmic reticulum and plasma membranes. The authors studied the effects of aluminum on calcium transport in the adult rat brain. They examined (45)Ca-uptake in microsomes and Ca(2+)-ATPase activity in microsomes and synaptosomes isolated from the frontal cortex and cerebellum of adult male Long-Evans rats. ATP-dependent (45)Ca-uptake was similar in microsomes from both brain regions. The addition of 50-800 microM AlCl3 resulted in a concentration-dependent inhibition of (45)Ca-uptake. Mg(2+)-dependent Ca(2+)-ATPase activity was significantly lower in synaptosomes compared to microsomes in both frontal cortex and cerebellum. In contrast to the uptake studies, AlCl3 stimulated Mg(2+)-dependent Ca(2+)-ATPase activity in both microsomes and synaptosomes from both brain regions. To determine the relationship between aluminum and Mg(2+), the authors measured ATPase activity in the presence of increasing concentrations of Mg(2+) or AlCl3. Maximal ATPase activity was obtained between 3 and 6 mM Mg(2+). (Copyright (c) 1994 VCH Publishers, Inc.)