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- W4317360131 abstract "Abstract Aim Valuable studies have tested the role of UCP1 on body temperature maintenance in mice, and we sought to knockout Ucp1 in rats ( Ucp1 −/− ) to provide insight into thermogenic mechanisms in larger mammals. Methods We used CRISPR/Cas9 technology to create Ucp1 −/− rats. Body weight and adiposity were measured, and rats were subjected to indirect calorimetry. Rats were maintained at room temperature or exposed to 4°C for either 24 h or 14 days. Analyses of brown and white adipose tissue and skeletal muscle were conducted via histology, western blot comparison of oxidative phosphorylation proteins, and qPCR to compare mitochondrial DNA levels and mRNA expression profiles. RNA‐seq was performed in skeletal muscle. Results Ucp1 −/− rats withstood 4°C for 14 days, but core temperature steadily declined. All rats lost body weight after 14 days at 4°C, but controls increased food intake more robustly than Ucp1 −/− rats. Brown adipose tissue showed signs of decreased activity in Ucp 1 −/− rats, while mitochondrial lipid metabolism markers in white adipose tissue and skeletal muscle were increased. Ucp1 −/− rats displayed more visible shivering and energy expenditure than controls at 4°C. Skeletal muscle transcriptomics showed more differences between genotypes at 23°C than at 4°C. Conclusion Room temperature presented sufficient cold stress to rats lacking UCP1 to activate compensatory thermogenic mechanisms in skeletal muscle, which were only activated in control rats following exposure to 4°C. These results provide novel insight into thermogenic responses to UCP1 deficiency; and highlight Ucp 1 −/− rats as an attractive translational model for the study of thermogenesis." @default.
- W4317360131 created "2023-01-19" @default.
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- W4317360131 date "2023-02-07" @default.
- W4317360131 modified "2023-10-15" @default.
- W4317360131 title "Rats lacking <i>Ucp1</i> present a novel translational tool for the investigation of thermogenic adaptation during cold challenge" @default.
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- W4317360131 doi "https://doi.org/10.1111/apha.13935" @default.
- W4317360131 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36650072" @default.
- W4317360131 hasPublicationYear "2023" @default.
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