Metabolismo De Lipideos |verified| -
La digestión de lípidos comienza en la boca, donde la enzima lingual lipasa inicia la hidrólisis de los triglicéridos (grasas) en ácidos grasos y glicerol. Sin embargo, la mayor parte de la digestión de lípidos ocurre en el intestino delgado, donde las enzimas pancreáticas, como la lipasa pancreática, hidrolizan los triglicéridos en ácidos grasos y glicerol.
La síntesis de lípidos ocurre en el hígado y otros tejidos. Los ácidos grasos se sintetizan a partir de la acetil-CoA a través de la ruta de la síntesis de ácidos grasos. Los triglicéridos se sintetizan a partir de los ácidos grasos y el glicerol. metabolismo de lipideos
Lipids, broadly defined as hydrophobic or amphipathic biological molecules, are far more than mere passive energy reserves. The term "metabolismo de lípidos" encompasses a complex, highly regulated network of catabolic and anabolic pathways that are fundamental to cellular life. These pathways govern the breakdown of dietary fats for energy (β-oxidation), the synthesis of fatty acids and complex lipids (lipogenesis), and the formation and clearance of lipoproteins for transport. Disruptions in lipid metabolism are central to the pathogenesis of prevalent metabolic diseases, including obesity, atherosclerosis, type 2 diabetes, and non-alcoholic fatty liver disease (NAFLD). This essay will provide a detailed examination of the core pathways of lipid metabolism—digestion and absorption, transport, catabolism (β-oxidation and ketogenesis), and anabolism (lipogenesis and lipogenesis)—highlighting their biochemical mechanisms, regulatory logic, and physiological integration. La digestión de lípidos comienza en la boca,
O "colesterol bom", que recolhe o excesso de colesterol dos tecidos e o leva de volta ao fígado (transporte reverso). 4. Degradação de Lipídeos (Catabolismo) Los ácidos grasos se sintetizan a partir de
Dysregulation of these pathways underlies major diseases. results from chronic positive energy balance, with hypertrophied adipocytes becoming insulin-resistant and releasing excess FFAs (lipotoxicity). Atherosclerosis is driven by retention of apoB-containing lipoproteins (LDL) in artery walls, where they become oxidized, triggering inflammation and plaque formation. NAFLD arises from ectopic TAG accumulation in the liver due to increased lipogenesis and reduced VLDL export, often in the context of insulin resistance. The carnitine shuttle defects cause hypoketotic hypoglycemia and cardiomyopathy in infants. Understanding these pathways has led to effective therapies: statins (HMG-CoA reductase inhibitors), fibrates (PPAR-α activators that enhance fatty acid oxidation), and emerging inhibitors of ACC or SCD1 for NAFLD.
A enzima lipase pancreática quebra os triacilgliceróis em ácidos graxos livres e monoacilgliceróis.