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The role of insulin in the control of hepatic fatty acid and glycerolipid metabolism assessed by studies in vivo
Braz. j. med. biol. res ; 28(10): 1027-31, Oct. 1995. graf
Artículo en Inglés | LILACS | ID: lil-160992
ABSTRACT
The liver secretes triacylglycerol-rich very-low-density lipoproteins (VLDL). Teleologically, it would be expected that during the prandial/early absorptive periodo the rate of hepatic VLDL secretion would be inhibited, in view of the concomitant secretation of chylomicrons from the gut. Such inhibition would limit the extent and duration of post-prandial hyperlipaemia. Experiments in wich the fatty acids of the liver were labelled specifically in rats in vivo show that, during a meal, triacylglycerol secretion was inhibited through a combination of diversion of flux towards phospholipid synthesis, and inhibition of the fractional rate of secretion of triacylglycerol. These adaptations occur even in diabetic rats, indicating that insulin is not obligatorily involved in mediating them. It is suggested that uptake of osmolytes (e.g. amino acids that are cotransported with Na+ions into hepatocytes) from the portal circulation may result in increased hepatocyte volume and that this, in turn, alters fatty acid and glycerolipid metabolism independently of, but possibly in synergy with, insulin action.
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Índice: LILACS (Américas) Asunto principal: Triglicéridos / Ácidos Grasos / Insulina / Lipoproteínas VLDL / Hígado Tipo de estudio: Revisiones Sistemáticas Evaluadas Límite: Animales Idioma: Inglés Revista: Braz. j. med. biol. res Asunto de la revista: Biologia / Medicina Año: 1995 Tipo del documento: Artículo / Congreso y conferencia

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Índice: LILACS (Américas) Asunto principal: Triglicéridos / Ácidos Grasos / Insulina / Lipoproteínas VLDL / Hígado Tipo de estudio: Revisiones Sistemáticas Evaluadas Límite: Animales Idioma: Inglés Revista: Braz. j. med. biol. res Asunto de la revista: Biologia / Medicina Año: 1995 Tipo del documento: Artículo / Congreso y conferencia