The precise, hormonally mediated regulation of triglyceride breakdown within fat cells, or adipocytes, into glycerol and free fatty acids. This process is crucial for mobilizing energy stores when the body requires fuel, influencing overall metabolic health and body composition. Proper control is essential for maintaining energy homeostasis and preventing ectopic fat deposition.
Origin
This concept stems from the fundamental physiological and endocrinological understanding of lipid metabolism and energy balance in human biology. The terms adipose tissue, lipolysis, and control are derived from Latin and Greek roots, representing the anatomical location, the biochemical process of fat splitting, and the regulatory oversight, respectively.
Mechanism
Key hormones such as epinephrine, norepinephrine, and glucagon activate lipolysis via G-protein coupled receptors, leading to the phosphorylation and activation of hormone-sensitive lipase (HSL) and adipose triglyceride lipase (ATGL). Conversely, insulin acts as a powerful anti-lipolytic signal, inhibiting the breakdown of stored fat by suppressing these lipase enzymes. This delicate counter-regulatory balance dictates the rate at which stored energy is released into the circulation for use by other tissues.
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