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Glycogenolytic action of glucagon-family peptides and epinephrine on catfish hepatocytes

Fish Physiology and Biochemistry, ISSN: 0920-1742, Vol: 6, Issue: 6, Page: 387-394
1989
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Glycogenolytic effects of salmon and mammalian glucagons, salmon glucagon-like peptide (GLP) and epinephrine were studied on liver cells isolated from catfish (Ictalurus melas). In spring and summer, salmo-glucagon (3×10 to 3×10 M) was more effective than its mammalian counterpart in the stimulation of glucose release and cAMP synthesis in hepatocytes. GLP was less potent as compared to both glucagons. γ-amylase activity was not affected by the treatment with either glucagon-family peptides or epinephrine. The comparison of the glycogenolytic effects of salmon glucagon to those of epinephrine reveals a greater potency of the latter hormone in the stimulation of cAMP synthesis, glycogen-phosphorylase activity and glucose release. Glycogen content in the liver cells was equally depleted after treatment with both of the two hormones. © 1989 Kugler Publication.

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