Direct intestinal cholesterol secretion contributes significantly to total fecal neutral sterol excretion in mice.

Abstract:

BACKGROUND & AIMS:Hepatobiliary secretion is generally believed to be an integral step in the pathway of cholesterol excretion from the body. Here we have investigated the validity of this paradigm in mice. METHODS:Cholesterol balance was assessed by measuring intake, excretion, and biliary output in different mouse models. Direct secretion of cholesterol from the luminal side of enterocytes was studied by perfusion of isolated segments of the small intestine in mice. RESULTS:Cholesterol input and output measurements in different mouse models revealed that fecal neutral sterol excretion was higher than the sum of dietary cholesterol intake and biliary cholesterol secretion indicating the existence of an alternative pathway. Here we show that substantial amounts of cholesterol can be secreted directly by enterocytes. Transintestinal cholesterol secretion is a specific process observed throughout the small intestine (proximal > medial > distal). Secretion depended on the presence of a cholesterol acceptor and was strongly stimulated by bile salts and phospholipids. The capacity of the pathway was sufficient to account for the missing cholesterol in the balance studies. The contribution of this pathway to cholesterol excretion in mice is approximately twice that of the biliary pathway. CONCLUSIONS:In mice, the intestine plays a significant role in removal of cholesterol from the body.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

van der Velde AE,Vrins CL,van den Oever K,Kunne C,Oude Elferink RP,Kuipers F,Groen AK

doi

10.1053/j.gastro.2007.06.019

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

967-75

issue

3

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(07)01160-2

journal_volume

133

pub_type

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