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Journal of Pharmacobio-Dynamics
Vol. 15 (1992) No. 3 P 107-112

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http://doi.org/10.1248/bpb1978.15.107


The effects of phalloidin and α-amanitin as toxins of Amanita species and DL-propargylglycine identified from A. abrupta on the glycogenolysis in isolated rat hepatocytes were investigated. Phalloidin decreased glycogen content and activated phosphorylase α activity remarkably. α-Amanitin also decreased glycogen content significantly but activated phosphorylase α activity slightly. DL-Propargylglycine slightly affected glycogenolysis. Phalloidin, which most affected glycogenolysis among the three compounds mentioned above, elevated cytosolic Ca2+ concentration ([Ca2+]i) and 45Ca uptake into cells. Phalloidin depressed slightly 3H-inositol incorporation into phosphatidylinositol (PI) and remarkably phosphatidylinosito 4, 5-bisphosphate (PIP2) but increased phosphoinositides breakdown. These results suggest that phalloidin alters phosphoinositides turnover and intracellular Ca2+ homeostasis, subsequently activates phosphorylase α, resulting in glycogenolysis in isolated rat hepatocytes.

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