OBJECTIVE: Familial hypobetalipoproteinemia (FHBL) is characterized by inherited low plasma levels of apolipoprotein B (apoB)-containing lipoproteins. In this paper we investigated whether the already described APOB R463W missense mutation, a FHBL mutation able to impair the activity of microsomal triglyceride transfer protein (MTP), may cause intestinal fat accumulation and reduced postprandial lipemia. METHODS: Four out of five probands harboring APOB R463W mutation were compared with six healthy controls and six patients with celiac disease (CD). An oral fat load supplemented with retinyl palmitate (RP) was administered and a gastro-duodenal endoscopy with biopsy was performed. RESULTS: Plasma triglyceride area under curves was significantly reduced in FHBL probands compared to controls and CD patients; the proportion of absorbed RP was similar to that of CD patients. Only the intestinal biopsies of FHBL patients showed lipids accumulating within the duodenal mucosa. CONCLUSIONS: FHBL due to R463W apoB mutation is a cause of intestinal fat accumulation and postprandial lipid absorption impairment.
OBJECTIVE:Familial hypobetalipoproteinemia (FHBL) is characterized by inherited low plasma levels of apolipoprotein B (apoB)-containing lipoproteins. In this paper we investigated whether the already described APOBR463W missense mutation, a FHBL mutation able to impair the activity of microsomal triglyceride transfer protein (MTP), may cause intestinal fat accumulation and reduced postprandial lipemia. METHODS: Four out of five probands harboring APOBR463W mutation were compared with six healthy controls and six patients with celiac disease (CD). An oral fat load supplemented with retinyl palmitate (RP) was administered and a gastro-duodenal endoscopy with biopsy was performed. RESULTS: Plasma triglyceride area under curves was significantly reduced in FHBL probands compared to controls and CDpatients; the proportion of absorbed RP was similar to that of CDpatients. Only the intestinal biopsies of FHBLpatients showed lipids accumulating within the duodenal mucosa. CONCLUSIONS:FHBL due to R463WapoB mutation is a cause of intestinal fat accumulation and postprandial lipid absorption impairment.
Authors: Sebastiano Calandra; Patrizia Tarugi; Helen E Speedy; Andrew F Dean; Stefano Bertolini; Carol C Shoulders Journal: J Lipid Res Date: 2011-08-23 Impact factor: 5.922