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Both the adipose tissue and the liver can synthesize triglycerides. Those produced by the liver are secreted from it in the form of very-low-density lipoproteins (VLDL). VLDL particles are secreted directly into blood, where they function to deliver the endogenously derived lipids to peripheral tissues.
Adipose tissue (also known as body fat or simply fat) is a loose connective tissue composed mostly of adipocytes. [1] [2] It also contains the stromal vascular fraction (SVF) of cells including preadipocytes, fibroblasts, vascular endothelial cells and a variety of immune cells such as adipose tissue macrophages.
White adipose tissue, also known as white fat, is one two types of adipose tissue in mammals. White adipose tissue stores energy in the form of triglycerides, which can be broken down to free fatty acids on demand. Its normal function is to store free fatty acids as triglycerides within the tissue. When glucose is deficient, in situations like ...
Perilipin 1A is a key protein regulator of lipolysis in adipose tissue. This lipid droplet-associated protein, when deactivated, will prevent the interaction of lipases with triglycerides in the lipid droplet and grasp the ATGL co-activator, comparative gene identification 58 (CGI-58) (a.k.a. ABHD5).
The marrow adipose tissue depot is poorly understood in terms of its physiologic function and relevance to bone health. Marrow adipose tissue expands in states of low bone density but additionally expands in the setting of obesity. [4] Marrow adipose tissue response to exercise approximates that of white adipose tissue.
Adipose triglyceride lipase, also known as patatin-like phospholipase domain-containing protein 2 and ATGL, is an enzyme that in humans is encoded by the PNPLA2 gene. [ 5 ] [ 6 ] [ 7 ] ATGL catalyses the first reaction of lipolysis , [ 8 ] where triacylglycerols are hydrolysed to diacylglycerols .
Although HSL is able to catalyze hydrolysis of triglycerides and diglycerides, another enzyme found in adipose tissue, adipose triglyceride lipase (ATGL), has a higher affinity for triglycerides than HSL, and ATGL predominantly acts as the enzyme for triglyceride-specific hydrolysis in the adipocyte. Hormone-sensitive lipase, which has 11-fold ...
Triglycerides, stored in adipose tissue, are a major form of energy storage both in animals and plants. They are a major source of energy in aerobic respiration. The complete oxidation of fatty acids releases about 38 kJ/g (9 kcal/g), compared with only 17 kJ/g (4 kcal/g) for the oxidative breakdown of carbohydrates and proteins.