Lipolysis
Lipolysis - Related Videos
07:59
Measurement of Basal and Forskolin-stimulated Lipolysis in Inguinal Adipose Fat Pads
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Cited by 10 •
2017
This protocol describes the method of determining basal and forskolin-stimulated lipolysis in inguinal fat pads obtained from normal chow diet (NCD) or high fat diet (HFD) ± capsaicin fed wild type mice. As an index for lipolysis, glycerol release was measured from inguinal adipose fat pads.
06:21
Hepatic Glucose Production, Ureagenesis, and Lipolysis Quantified using the Perfused Mouse Liver Model
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Cited by 4 •
2023
Here, we present a robust method for in situ perfusion of the mouse liver to study the acute and direct regulation of liver metabolism without disturbing the hepatic architecture but in the absence of extra-hepatic factors.
09:41
Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
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Cited by 10 •
2023
Triglyceride lipolysis in adipocytes is an important metabolic process resulting in the liberation of free fatty acids and glycerol. Here, we provide a detailed protocol to measure basal and stimulated lipolysis in adipocytes and ex vivo adipose tissue from mice.
FAQs
The three enzymes act in a defined sequence rather than as interchangeable catalysts. Adipose triglyceride lipase initiates hydrolysis of stored triacylglycerol, hormone-sensitive lipase continues the breakdown, and monoglyceride lipase completes it. This ordered division of labor helps explain how adipocytes progressively mobilize stored fuel and generate the products needed during increased energy demand.
Adrenaline activates lipolysis through a signaling cascade, not by directly serving as a fuel. It stimulates cyclic AMP production, which activates protein kinase A; this signaling promotes the lipolytic pathway in adipocytes. The cascade links an external hormonal cue to intracellular enzyme activity, allowing fat mobilization to respond rapidly when the body's energy requirements rise.
Fasting and exercise increase the need to draw on stored energy, so they are physiological conditions in which lipolysis becomes more active. Mobilized fatty acids can enter the circulation and be oxidized by tissues, helping supply energy when immediate fuel availability is insufficient. This response connects adipose-tissue metabolism with whole-body energy balance.
Fatty acids and glycerol do not have identical metabolic destinations after triacylglycerol breakdown. Fatty acids enter the circulation for oxidation in tissues, whereas glycerol can support glucose production. Separating these products allows lipolysis to contribute simultaneously to energy release and to maintenance of glucose availability, particularly during conditions that increase fuel demand.
Studying lipolysis provides a way to examine how the body switches between storing energy and making it available. Increased pathway activity reflects mobilization of adipose reserves, while its regulation by hormonal signaling shows how cells coordinate fuel supply with demand. This makes lipolysis relevant to biological explanations of energy balance and metabolic regulation.
The pathway is relevant to obesity and diabetes research because it connects adipose fuel mobilization with systemic energy handling. Examining its enzyme sequence and hormone-responsive signaling can help characterize metabolic regulation in these conditions. Its products also provide a mechanistic link between adipose tissue, circulating fuels, tissue oxidation, and glucose production.