title: Altered desaturation and elongation of fatty acids in hormone-sensitive lipase null mice.
abstract: BACKGROUND
  Hormone-sensitive lipase (HSL) is expressed predominantly in adipose tissue, where it plays an important role in catecholamine-stimulated hydrolysis of stored lipids, thus mobilizing fatty acids. HSL exhibits broad substrate specificity and besides acylglycerides it hydrolyzes cholesteryl esters, retinyl esters and lipoidal esters. Despite its role in fatty acid mobilization, HSL null mice have been shown to be resistant to diet-induced obesity. The aim of this study was to define lipid profiles in plasma, white adipose tissue (WAT) and liver of HSL null mice, in order to better understand the role of this multifunctional enzyme.
  
  
  RESULTS
  This study used global and targeted lipidomics and expression profiling to reveal changed lipid profiles in WAT, liver and plasma as well as altered expression of desaturases and elongases in WAT and liver of HSL null mice on high fat diet. Decreased mRNA levels of stearoyl-CoA desaturase 1 and 2 in WAT were consistent with a lowered ratio of 16:1n7/16:0 and 18:1n9/18:0 in WAT and plasma. In WAT, increased ratio of 18:0/16:0 could be linked to elevated mRNA levels of the Elovl1 elongase.
  
  
  CONCLUSIONS
  This study illustrates the importance of HSL for normal lipid metabolism in response to a high fat diet. HSL deficiency greatly influences the expression of elongases and desaturases, resulting in altered lipid profiles in WAT, liver and plasma. Finally, altered proportions of palmitoleate, a recently-suggested lipokine, in tissue and plasma of HSL null mice, could be an important factor mediating and contributing to the changed lipid profile, and possibly also to the decreased insulin sensitivity seen in HSL null mice.
authors: Department of Experimental Medical Science, Lund University, Lund, Sweden.
authors: Céline
authors: C
authors: Fernandez
authors: Kai
authors: K
authors: Schuhmann
authors: Ronny
authors: R
authors: Herzog
authors: Barbara
authors: B
authors: Fielding
authors: Keith
authors: K
authors: Frayn
authors: Andrej
authors: A
authors: Shevchenko
authors: Peter
authors: P
authors: James
authors: Cecilia
authors: C
authors: Holm
authors: Kristoffer
authors: K
authors: Ström
mesh_terms: D052436:Adipose Tissue, White / Q000378:metabolism; D000818:Animals; D005227:Fatty Acids / Q000378:metabolism*; D005260:Female; D050356:Lipid Metabolism / Q000235:genetics / Q000502:physiology; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D002787:Sterol Esterase / Q000235:genetics / Q000378:metabolism*
chemical_list: D005227:Fatty Acids; D002787:Sterol Esterase