Ontogenesis and Modulation of Intestinal Unesterified Cholesterol Sequestration in a Mouse Model of Niemann-Pick C1 Disease.
Dig Dis Sci
; 65(1): 158-167, 2020 01.
Article
en En
| MEDLINE
| ID: mdl-31312996
ABSTRACT
BACKGROUND:
Mutations in the NPC1 gene result in sequestration of unesterified cholesterol (UC) and glycosphingolipids in most tissues leading to multi-organ disease, especially in the brain, liver, lungs, and spleen. Various data from NPC1-deficient mice suggest the small intestine (SI) is comparatively less affected, even in late stage disease.METHODS:
Using the Npc1nih mouse model, we measured SI weights and total cholesterol (TC) levels in Npc1-/- versus Npc1+/+ mice as a function of age, and then after prolonged ezetimibe-induced inhibition of cholesterol absorption. Next, we determined intestinal levels of UC and esterified cholesterol (EC), and cholesterol synthesis rates in Npc1-/- and Npc1+/+ mice, with and without the cholesterol-esterifying enzyme SOAT2, following a once-only subcutaneous injection with 2-hydroxypropyl-ß-cyclodextrin (2HPßCD).RESULTS:
By ~ 42 days of age, intestinal TC levels averaged ~ 2.1-fold more (mostly UC) in the Npc1-/- versus Npc1+/+ mice with no further increase thereafter. Chronic ezetimibe treatment lowered intestinal TC levels in the Npc1-/- mice by only ~ 16%. In Npc1-/- mice given 2HPßCD 24 h earlier, UC levels fell, EC levels increased (although less so in mice lacking SOAT2), and cholesterol synthesis was suppressed equally in the Npc1-/-Soat2+/+ and Npc1-/-Soat2-/- mice.CONCLUSIONS:
The low and static levels of intestinal UC sequestration in Npc1-/- mice likely reflect the continual sloughing of cells from the mucosa. This sequestration is blunted by about the same extent following a single acute treatment with 2HPßCD as it is by a prolonged ezetimibe-induced block of cholesterol absorption.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Colesterol
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Péptidos y Proteínas de Señalización Intracelular
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Enfermedad de Niemann-Pick Tipo C
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Absorción Intestinal
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Mucosa Intestinal
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Intestino Delgado
Límite:
Animals
Idioma:
En
Revista:
Dig Dis Sci
Año:
2020
Tipo del documento:
Article
País de afiliación:
Estados Unidos