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Hidden Disease Susceptibility and Sexual Dimorphism in the Heterozygous Knockout of Cyp51 from Cholesterol Synthesis

We examined the genotype-phenotype interactions of Cyp51(+/−) mice carrying one functional allele of lanosterol 14α-demethylase from cholesterol biosynthesis. No distinct developmental or morphological abnormalities were observed by routine visual inspection of Cyp51(+/−) and Cyp51(+/+) mice and fer...

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Detalles Bibliográficos
Autores principales: Lewinska, Monika, Juvan, Peter, Perse, Martina, Jeruc, Jera, Kos, Spela, Lorbek, Gregor, Urlep, Ziga, Keber, Rok, Horvat, Simon, Rozman, Damjana
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4231084/
https://www.ncbi.nlm.nih.gov/pubmed/25393872
http://dx.doi.org/10.1371/journal.pone.0112787
Descripción
Sumario:We examined the genotype-phenotype interactions of Cyp51(+/−) mice carrying one functional allele of lanosterol 14α-demethylase from cholesterol biosynthesis. No distinct developmental or morphological abnormalities were observed by routine visual inspection of Cyp51(+/−) and Cyp51(+/+) mice and fertility was similar. We further collected a large data-set from female and male Cyp51(+/−) mice and controls fed for 16 weeks with three diets and applied linear regression modeling. We used 3 predictor variables (genotype, sex, diet), and 39 response variables corresponding to the organ characteristics (7), plasma parameters (7), and hepatic gene expression (25). We observed significant differences between Cyp51(+/−) and wild-type mice in organ characteristics and blood lipid profile. Hepatomegaly was observed in Cyp51(+/−) males, together with elevated total and low-density lipoprotein cholesterol. Cyp51(+/−) females fed high-fat, high-cholesterol diet were leaner and had elevated plasma corticosterone compared to controls. We observed elevated hepatocyte apoptosis, mitosis and lipid infiltration in heterozygous knockouts of both sexes. The Cyp51(+/−) females had a modified lipid storage homeostasis protecting them from weight-gain when fed high-fat high-cholesterol diet. Malfunction of one Cyp51 allele therefore initiates disease pathways towards cholesterol-linked liver pathologies and sex-dependent response to dietary challenge.