Cyclic AMP Increase the Na+ Permeability of the Avian Erythrocyte Membrane by a Process Which Does Not Involve Protein Phosphorylation
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Preparations of avian erythrocyte plasma membranes have been made which are in the form of sealed vesicles. Using these preparations the permeability of the membranes to N+, K+, Mg2+ and Ca2+ was measured. Monobutyryl cyclic AMP and cyclic AMP increased the permeability to Na+ and Ca+ under conditions where no protein phosphorylation could occur. The only effect of phosphorylation of membrane proteins was to reduce Ca+ permeability. It is thus concluded that cyclic AMP increases Na+ permeability in the avian erythroycte by a direct effect which does not involve protein phosphorylation.
Carstens M, Weller M Mol Cell Biochem. 1981; 40(2):95-104.
PMID: 6273713 DOI: 10.1007/BF00224752.