Relationship between hepatic and mitochondrial ceramides: a novel in vivo method to track ceramide synthesis
Title
Relationship between hepatic and mitochondrial ceramides: a novel in vivo method to track ceramide synthesis
Creator
Justine M Mucinski
Jonas M McCaffrey
R Scott Rector
Takhar Kasumov
Elizabeth J Parks
Publisher
Journal of Lipid Research
Date
2023 Apr 5
Description
Ceramides (CERs) are key intermediate sphingolipids implicated in contributing to mitochondrial dysfunction and the development of multiple metabolic conditions. Despite the growing evidence of CER role in disease risk, kinetic methods to measure CER turnover are lacking, particularly using in vivo models. The utility of orally administered 13C3, 15N l-serine, dissolved in drinking water, was tested to quantify CER 18:1/16:0 synthesis in 10-week-old male and female C57Bl/6 mice. To generate isotopic labeling curves, animals consumed either a control diet or high-fat diet (HFD; n = 24/diet) for 2 weeks and varied in the duration of the consumption of serine-labeled water (0, 1, 2, 4, 7, or 12 days; n = 4 animals/day/diet). Unlabeled and labeled hepatic and mitochondrial CERs were quantified using liquid chromatography tandem MS. Total hepatic CER content did not differ between the two diet groups, whereas total mitochondrial CERs increased with HFD feeding (60%, P < 0.001). Within hepatic and mitochondrial pools, HFD induced greater saturated CER concentrations (P < 0.05) and significantly elevated absolute turnover of 16:0 mitochondrial CER (mitochondria: 59%, P < 0.001 vs. liver: 15%, P = 0.256). The data suggest cellular redistribution of CERs because of the HFD. These data demonstrate that a 2-week HFD alters the turnover and content of mitochondrial CERs. Given the growing data on CERs contributing to hepatic mitochondrial dysfunction and the progression of multiple metabolic diseases, this method may now be used to investigate how CER turnover is altered in these conditions.
Source
DOI: 10.1016/j.jlr.2023.100366
Language
English
Citation
Justine M Mucinski et al., “Relationship between hepatic and mitochondrial ceramides: a novel in vivo method to track ceramide synthesis,” NEOMED Bibliography Database, accessed March 28, 2024, https://neomed.omeka.net/items/show/12308.