Ottolenghi C, Puviani A C, Gavioli M E, Brighenti L
Gen Comp Endocrinol. 1986 Mar;61(3):469-75. doi: 10.1016/0016-6480(86)90235-2.
In catfish, the percentage of the active (a) form of glycogen phosphorylase with respect to the total (a + b) form varied in control slices from about 90% to 65% and 20%, respectively for liver, red, and white muscles. Epinephrine added to the incubation medium of liver and white muscle slices caused a significant increase in the specific activity of phosphorylase a in liver and white muscle, but not in red muscle. In liver slices epinephrine showed its effect from the concentration of 3.5 X 10(-8) M. The increase of enzyme activity explains the lowering of the glycogen level in liver and white muscle induced by epinephrine.
