Hormone-sensitive lipase-independent adipocyte lipolysis during beta-adrenergic stimulation, fasting, and dietary fat loading

• Published in: American journal of physiology: endocrinology and metabolism Vol. 287; no. 2; pp. E282 - E288
• Main Authors: Fortier, Mélanie, Wang, Shu Pei, Mauriège, Pascale, Semache, Meriem, Mfuma, Léandra, Li, Hong, Levy, Emile, Richard, Denis, Mitchell, Grant A
• Format: Journal Article
• Language: English
• Published: United States 01.08.2004
• Subjects: Adipocytes - cytology; Adipocytes - drug effects; Adipocytes - metabolism; Adrenergic beta-Agonists - pharmacology; Analysis of Variance; Animals; Cells, Cultured; Dietary Fats - metabolism; Dietary Fats - pharmacology; Dioxoles - pharmacology; Energy Metabolism - drug effects; Energy Metabolism - genetics; Fasting - metabolism; Fatty Acids - metabolism; Fatty Acids - pharmacology; Female; Homeostasis - drug effects; Homeostasis - genetics; Lipolysis - drug effects; Lipolysis - physiology; Male; Mice; Mice, Knockout; Motor Activity - drug effects; Motor Activity - genetics; Sterol Esterase - deficiency; Sterol Esterase - genetics; Sterol Esterase - physiology
• ISSN: 0193-1849; 1522-1555
• DOI: 10.1152/ajpendo.00203.2003

In white adipose tissue, lipolysis can occur by hormone-sensitive lipase (HSL)-dependent or HSL-independent pathways. To study HSL-independent lipolysis, we placed HSL-deficient mice in conditions of increased fatty acid flux: beta-adrenergic stimulation, fasting, and dietary fat loading. Intraperitoneal administration of the beta(3)-adrenergic agonist CL-316243 caused a greater increase in nonesterified fatty acid level in controls (0.33 +/- 0.05 mmol/l) than in HSL(-/-) mice (0.12 +/- 0.01 mmol/l, P < 0.01). Similarly, in isolated adipocytes, lipolytic response to CL-316243 was greatly reduced in HSL(-/-) mice compared with controls. Fasting for <or=48 h produced normal mobilization and oxidation of fatty acids in HSL(-/-) mice, as judged by similar values of respiratory quotient and oxygen consumption as in HSL(+/+) controls. In isolated adipocytes, lipolysis in the absence of beta-adrenergic stimulation was 1.9-fold greater in HSL(-/-) than in HSL(+/+) cells (P < 0.05), increasing to 6.5-fold after fasting (P < 0.01). After 6 wk of a fat-rich diet containing 31.5% of energy as lipid, weight gain of HSL(-/-) mice was 4.4-fold less than in HSL(+/+) mice (P < 0.01), and total abdominal fat mass was 5.2-fold lower in HSL(-/-) than in HSL(+/+) mice (P < 0.01). In white adipose tissue, HSL is essential for normal acute beta-adrenergic-stimulated lipolysis and permits normal triglyceride storage capacity in response to dietary fat loading. However, HSL-independent lipolysis can markedly increase during fasting, both in isolated adipocytes and in intact mice, and can mediate a normal flux of fatty acids during fasting.