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Cholesteryl ester accumulation and accelerated cholesterol absorption in intestine-specific hormone sensitive lipase-null mice.

Biochimica et biophysica acta
November 1, 2012
Sascha Obrowsky et al. (9 authors)
Journal ArticleResearch Support, Non-U.S. Gov'tAnimal Study
Extracted Claims (14)
InterventionDirectionEndpointPopulationDosageImpactClaim #
lack of intestinal HSL
no change
plasma lipid concentrations
Chow diet-fed HSLiKO mice
-
unchanged
#1
feeding with high fat/high cholesterol (HF/HC) diet in HSLiKO mice
no change
triglyceride
HSLiKO mice
-
unaltered
#2
feeding with high fat/high cholesterol (HF/HC) diet in HSLiKO mice
increase
plasma cholesterol concentrations
HSLiKO mice
-
increased
#3
feeding with high fat/high cholesterol (HF/HC) diet in HSLiKO mice
increase
CE in the small intestine
HSLiKO mice
-
accumulation
#4
acute cholesterol load in HSLiKO mice
increase
plasma cholesterol concentrations
HSLiKO mice
-
increased
#5
acute cholesterol load in HSLiKO mice
increase
CE in the small intestine
HSLiKO mice
-
accumulation
#6
Gavaging of radioactively labeled cholesterol in HSLiKO mice
increase
radioactivity in plasma, liver and small intestine
HSLiKO mice
4h post-gavaging
increased abundance
#7
lack of intestinal HSL
no change
cholesterol absorption
HSLiKO mice
-
no significant difference
#8
lack of intestinal HSL
no change
mRNA expression levels of genes involved in intestinal cholesterol transport and esterification
HSLiKO mice
-
unchanged
#9
lack of intestinal HSL
decrease
HMG-CoA reductase and synthase
HSLiKO mice
-
downregulation
#10
lack of intestinal HSL
decrease
intestinal cholesterol biosynthesis
HSLiKO mice
-
less
#11
lack of intestinal HSL
increase
CE accumulation in the small intestine
-
-
leads to
#12
lack of intestinal HSL
increase
cholesterol absorption
-
-
accelerated
#13
lack of intestinal HSL
decrease
cholesterol biosynthesis
-
-
decreased
#14
Abstract

Hormone sensitive lipase (HSL) regulates the hydrolysis of acylglycerols and cholesteryl esters (CE) in various cells and organs, including enterocytes of the small intestine. The physiological role of this enzyme in enterocytes, however, stayed elusive. In the present study we generated mice lacking HSL exclusively in the small intestine (HSLiKO) to investigate the impact of HSL deficiency on intestinal lipid metabolism and the consequences on whole body lipid homeostasis. Chow diet-fed HSLiKO mice showed unchanged plasma lipid concentrations. In addition, feeding with high fat/high cholesterol (HF/HC) diet led to unaltered triglyceride but increased plasma cholesterol concentrations and CE accumulation in the small intestine. The same effect was observed after an acute cholesterol load. Gavaging of radioactively labeled cholesterol resulted in increased abundance of radioactivity in plasma, liver and small intestine of HSLiKO mice 4h post-gavaging. However, cholesterol absorption determined by the fecal dual-isotope ratio method revealed no significant difference, suggesting that HSLiKO mice take up the same amount of cholesterol but in an accelerated manner. mRNA expression levels of genes involved in intestinal cholesterol transport and esterification were unchanged but we observed downregulation of HMG-CoA reductase and synthase and consequently less intestinal cholesterol biosynthesis. Taken together our study demonstrates that the lack of intestinal HSL leads to CE accumulation in the small intestine, accelerated cholesterol absorption and decreased cholesterol biosynthesis, indicating that HSL plays an important role in intestinal cholesterol homeostasis.

Medical Subject Headings (MeSH)
AnimalsBlotting, WesternCholesterolCholesterol EstersFemaleIntegrasesIntestinal AbsorptionLipidsMaleMiceMice, KnockoutRNA, MessengerReal-Time Polymerase Chain ReactionReverse Transcriptase Polymerase Chain ReactionSterol EsteraseTriglycerides
Study Links
PubMed ID22842588
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