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The effects of isofagomine, a potent glycogen phosphorylase inhibitor, on glycogen metabolism in cultured mouse cortical astrocytes.
Waagepetersen, H S; Westergaard, N; Schousboe, A.
Afiliación
  • Waagepetersen HS; NeuroScience PharmaBiotec Res. Center, Dept. of Pharmacology, The Royal Danish School of Pharmacy, Copenhagen.
Neurochem Int ; 36(4-5): 435-40, 2000 Apr.
Article en En | MEDLINE | ID: mdl-10733011
A novel inhibitor of liver glycogen phosphorylase, isofagomine, was investigated as a possible inhibitor of the enzyme in the brain and in cultured astrocytes. Additionally, the effect of the drug on norepinephrine (NE) induced glycogen degradation in astrocytes was studied. Astrocytes were cultured from mouse cerebral cortex and homogenates were prepared from the cells as well as from mouse brain. Isofagomine dose-dependently inhibited glycogen phosphorylase when measured in the direction of glycogen degradation in both preparations with IC50 values (mean +/- SEM) of 1.0 +/- 0.1 microM and 3.3 +/- 0.5 microM in brain and astrocyte homogenates, respectively. Moreover, isofagomine at a concentration of 400 microM completely prevented NE induced depletion of glycogen stores and the concomitant lactate production in intact astrocytes. It is suggested that this novel glycogen phosphorylase inhibitor may be a valuable tool to investigate the functional importance of glycogen in astrocytes and in the brain.
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Piperidinas / Corteza Cerebral / Astrocitos / Inhibidores Enzimáticos / Glucógeno Límite: Animals Idioma: En Revista: Neurochem Int Año: 2000 Tipo del documento: Article Pais de publicación: Reino Unido
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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Piperidinas / Corteza Cerebral / Astrocitos / Inhibidores Enzimáticos / Glucógeno Límite: Animals Idioma: En Revista: Neurochem Int Año: 2000 Tipo del documento: Article Pais de publicación: Reino Unido