title: Bile acid synthesis precursors in subjects with genetic hypercholesterolemia negative for LDLR/APOB/PCSK9/APOE mutations. Association with lipids and carotid atherosclerosis.
abstract: Some oxysterols are precursors of bile acid synthesis and play an important role in cholesterol homeostasis. However, if they are involved in the pathogeny of genetic hypercholesterolemia has not been previously explored. We have studied non-cholesterol sterol markers of cholesterol synthesis (lanosterol and desmosterol) and oxysterols (7α-hydroxy-4-cholesten-3-one, 24S-hydroxycholesterol and 27-hydroxycholesterol) in 200 affected subjects with primary hypercholesterolemia of genetic origin, negative for mutations in LDLR, APOB, PCSK9 and APOE genes (non-FH GH) and 100 normolipemic controls. All studied oxysterols and cholesterol synthesis markers were significantly higher in affected subjects than controls (P<0.001). Ratios of oxysterols to total cholesterol were higher in non-FH GH than in controls, although only 24S-hydroxycholesterol showed statistical significance (P<0.001). Cholesterol synthesis markers had a positive correlation with BMI, triglycerides, cholesterol and apoB in control population. However, these correlations disappeared in non-FH GH with the exception of a weak positive correlation for non-HDL cholesterol and apoB. The same pattern was observed for oxysterols with high positive correlation in controls and absence of correlation for non-FH GH, except non-HDL cholesterol for 24S-hydroxycholesterol and 27-hydroxycholesterol and apoB for 27-hydroxycholesterol. All non-cholesterol sterols had positive correlation among them in patients and in controls. A total of 65 (32.5%) and 35 (17.5%) affected subjects presented values of oxysterols ratios to total cholesterol above the 95th percentile of the normal distribution (24S-hydroxycholesterol and 27-hydroxycholesterol, respectively). Those patients with the highest levels of 24S-hydroxycholesterol associated an increase in the carotid intima media thickness. These results suggest that bile acid metabolism is affected in some patients with primary hypercholesterolemia of genetic origin, negative for mutations in the candidate genes, and may confer a higher cardiovascular risk. Our results confirm that cholesterol synthesis overproduction is a primary defect in non-HF GH and suggest that subjects with non-FH GH show high levels of oxysterols in response to hepatic overproduction of cholesterol.
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain. Electronic address: lubailarueda@gmail.com.
authors: L
authors: L
authors: Baila-Rueda
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: A
authors: A
authors: Cenarro
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: I
authors: I
authors: Lamiquiz-Moneo
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: R
authors: R
authors: Mateo-Gallego
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: A M
authors: AM
authors: Bea
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: S
authors: S
authors: Perez-Calahorra
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: V
authors: V
authors: Marco-Benedi
authors: Unidad Clínica y de Investigación en Lípidos y Arteriosclerosis, Hospital Universitario Miguel Servet, Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain.
authors: F
authors: F
authors: Civeira
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001055:Apolipoproteins B / Q000235:genetics; D001057:Apolipoproteins E / Q000235:genetics; D001647:Bile Acids and Salts / Q000096:biosynthesis*; D002340:Carotid Artery Diseases / Q000235:genetics*; D059168:Carotid Intima-Media Thickness; D002784:Cholesterol / Q000378:metabolism; D015331:Cohort Studies; D005260:Female; D006801:Humans; D006937:Hypercholesterolemia / Q000235:genetics*; D008055:Lipids / Q000097:blood*; D008099:Liver / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009154:Mutation; D000072376:Oxysterols / Q000737:chemistry; D000071449:Proprotein Convertase 9 / Q000235:genetics; D011973:Receptors, LDL / Q000235:genetics; D012307:Risk Factors; D014463:Ultrasonography; D055815:Young Adult
chemical_list: D001055:Apolipoproteins B; D001057:Apolipoproteins E; D001647:Bile Acids and Salts; D008055:Lipids; D000072376:Oxysterols; D011973:Receptors, LDL; D002784:Cholesterol; C472125:PCSK9 protein, human; D000071449:Proprotein Convertase 9
keywords: 24(S)-Hydroxycholesterol; 27-Hydroxycholesterol; Bile acid synthesis; Carotid atherosclerosis; Cholesterol metabolism; Hypercholesterolemia; Oxysterols