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• W1508839342 abstract "Control of energy metabolism is crucial for optimal functioning of organs and tissues. Amongst all nutrients, glucose is the principal energy source for most cells and, therefore, minimum blood glucose levels must be guaranteed. Alterations in glycaemia can lead to hyperglycaemic states (producing protein glycosylation and toxicity in glucose-sensitive cells) or hypoglycaemic states (that can affect brain function), both harmful. Therefore, mechanisms must exist to keep glycaemia in a narrow physiological range (4-8 mM) independently of the nutritional state. To achieve control of blood glucose levels, our body has a complex, interorgan signaling system using nutrients (glucose, lipids, amino acids), hormones (insulin, glucagon, ghrelin, etc.) and the autonomic nervous system. In response to these signals, organs and tissues (mainly intestine, endocrine pancreas, liver, skeletal muscle, adipose tissue, brain and adrenal glands) adapt their function to energetic requirements. The liver plays a pivotal role in the maintenance of glucose homeostasis by continuously adapting its metabolism to energetic needs. In the fed state, when blood glucose levels are high and there is insulin, liver takes-up part glucose to replenish glycogen stores. Besides, when glucose stores are full, the liver has the capacity to synthesize lipids de novo from glucose for-long term energy storage. Lipids are packaged in very low-density lipoprotein (VLDL) particles and then transported to the adipose tissue. Conversely during starvation, when glycaemia falls and glucagon increases, the liver produces glucose to maintain circulating glucose levels by breaking down glycogen stores or by synthesizing glucose de novo through gluconeogenesis. Gluconeogenesis, as an energy-consuming pathway, is linked to ┚-oxidation of fatty acids (fuel supplier pathway). From this introduction on the regulation of glucose homeostasis, one can appreciate the close relation that exists between carbohydrate metabolism and lipid metabolism in the liver. Therefore, alterations in hepatic carbohydrate metabolic pathways may directly affect hepatic and/or blood lipid levels. Particularly, this chapter will focus on evaluating the incidence of glucokinase (GK) –the first enzyme of the glycolytic pathway in the liveron lipidemia and on hepatic lipid content. But first, an introductory overview of the physiology behind the first-pass metabolism of dietary glucose in the liver will be presented." @default.
• W1508839342 created "2016-06-24" @default.
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• W1508839342 date "2012-02-03" @default.
• W1508839342 modified "2023-10-16" @default.
• W1508839342 title "Liver Glucokinase and Lipid Metabolism" @default.
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• W1508839342 doi "https://doi.org/10.5772/29856" @default.
• W1508839342 hasPublicationYear "2012" @default.
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