Abstract
Understanding the molecular mechanisms of aging is crucial for enhancing healthy longevity. We conducted untargeted lipidomics across 13 biological samples from mice at various life stages (2, 12, 19 and 24 months) to explore the potential link between aging and lipid metabolism, considering sex (male or female) and microbiome (specific pathogen-free or germ-free) dependencies. By analyzing 2,704 molecules from 109 lipid subclasses, we characterized common and tissue-specific lipidome alterations associated with aging. For example, the levels of bis(monoacylglycero)phosphate containing polyunsaturated fatty acids increased in various organs during aging, whereas the levels of other phospholipids containing saturated and monounsaturated fatty acids decreased. In addition, we discovered age-dependent sulfonolipid accumulation, absent in germ-free mice, correlating with Alistipes abundance determined by 16S ribosomal RNA gene amplicon sequencing. In the male kidney, glycolipids such as galactosylceramides, galabiosylceramides (Gal2Cer), trihexosylceramides (Hex3Cer), and mono- and digalactosyldiacylglycerols were detected, with two lipid classes—Gal2Cer and Hex3Cer—being significantly enriched in aged mice. Integrated analysis of the kidney transcriptome revealed uridine diphosphate galactosyltransferase 8A (UGT8a), alkylglycerone phosphate synthase and fatty acyl-coenzyme A reductase 1 as potential enzymes responsible for the male-specific glycolipid biosynthesis in vivo, which would be relevant to sex dependency in kidney diseases. Inhibiting UGT8 reduced the levels of these glycolipids and the expression of inflammatory cytokines in the kidney. Our study provides a valuable resource for clarifying potential links between lipid metabolism and aging.
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Data availability
All raw MS data are available on the RIKEN DROP Met website (http://prime.psc.riken.jp/menta.cgi/prime/drop_index) under index number DM0044. The lipidomics results are recorded in Supplementary Data 1 and can be browsed from our RIKEN lipidomics database (http://prime.psc.riken.jp/menta.cgi/lipidomics/index). The raw RNA-sequencing data are available on the DNA Data Bank of Japan (DDBJ) web page under the identifier PRJDB14285. The raw 16S rDNA amplicon sequence data are available on the DDBJ webpage under the identifier PRJDB16347. The 16S rDNA and transcriptomics results are recorded in Supplementary Data 5 and 6, respectively. Source data are provided with this paper.
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Acknowledgements
This work was supported by the Japan Science and Technology Agency (JST) ERATO ‘Arita Lipidome Atlas Project’ (JPMJER2101 to H.T. and M.A.), RIKEN Aging Project (M.A. and A.M.), Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research on Innovative Areas ‘Biology of LipoQuality’ (15H05897 and 15H05898 to M.A.), JSPS KAKENHI (21K18216 to H.T., 22K11718 to T.I., 20H00495 to M.A.), National Cancer Center Research and Development Fund (2020-A-9 to H.T.), AMED Moonshot Research and Development Program (JP22zf0127007 to M.A.), AMED NEDDTrim (22ae0121036h0002 to M.A.), AMED Japan Program for Infectious Diseases Research and Infrastructure (21wm0325036h0001 to H.T. and M.A.), AMED Brain/MINDS (JP15dm0207001 to H.T.), JST National Bioscience Database Center (JPMJND2305 to H.T.) and Takeda Science Foundation (M.A.). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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H.T., T.I., A.M. and M.A. designed the study. H.T. and M.T. developed an MS-DIAL annotation system. T.I. prepared the biological samples, and T.I. and A.H. performed the LC–MS experiments. K.O. and S.I. performed the kidney transcriptome analysis. N.S.-T. and H.O. performed the microbiome analysis. Y.Y. developed the RIKEN lipidomics database. H.T. and M.A. wrote the paper. All authors have thoroughly discussed this project and helped improve the paper.
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Extended data
Extended Data Fig. 1 Summary of experimental design and lipid profiling in this study.
(a) Four types of mice were prepared: male and SPF (specific pathogen-free), male and GF (germ free), female and SPF, and female and GF. Total 13 biospecimens were harvested at 2 months, 12 months, 19 months, and 24 months. (b) The lipid extraction was performed for the optimal volume of biological samples. The untargeted lipidomics data was obtained using our experimental condition. The mass spectrometry data was analyzed by the MS-DIAL 4.20 algorithm with the updated lipid libraries. Panel a icons from iStock.
Extended Data Fig. 2 Lipid profiling result of AIN-93M chow.
The x- and y-axis show the lipid subclass name and the log10 transformed value of normalized peak height. Each dot denotes each lipid molecule. The elements of the box plot are defined as follows: center line, median; box limits, upper and lower quartiles; and whiskers, 1.5x interquartile range. The number of molecules included in each lipid subclass is described in Supplementary Data 1.
Extended Data Fig. 3 Relationship between fecal microbiome and lipidome.
(a) The scatter plot of principal coordinates analysis (PCoA) using the unweighted UniFrac distance. The sky- and dark-blue colors denote 2- and 24-month-old mice, respectively. The circle and diamond shapes denote male and female, respectively. (b) The correlations between Alistipes and sulfonolipid (SL). The 95% confidence interval is also described by the gray color. The correlation coefficient test was performed to calculate the p-value (two-sided). (c) Bacteria relative abundances between aged- and young mice. The left- and right panels show the results from 16S rRNA and qPCR data, respectively. Student t-test was used to calculate the p-value (two-sided). N = 6 biologically independent samples where the results of male and female mice are recognized in the same group to calculate the p-value.
Extended Data Fig. 4 The significantly changed lipids and their related metabolic pathways in kidney tissue.
(a) The metabolic pathway of ether-linked (alkylacyl) glycerolipids and glycerophospholipids. The level of ether PE is calculated from the molecules annotated as plasmalogen type in the positive ion mode. (b) The significant genes related to the alkylacyl glycerolipids, and the other UGT genes, which were expected to be related to glycosyl lipid metabolism. The definition of symbol and color in the dot plot is the same as in Fig. 2. The p-value was calculated by Dunnett’s test (two-sided). *P < 0.05, **P < 0.01, and ***P < 0.001 against 2 months. N = 6 biologically independent samples where the results of SPF and GF mice are recognized in the same group.
Extended Data Fig. 5 The correlation of genes with the lipid metabolites associated with gut microbiota.
The definitions of statistical significance with months (aging), SPF/GF, and gene-lipid correlation are the same as those in Fig. 6. For phosphatidylcholine (PC), the molecules containing 17:0 and 17:1 were investigated even if several molecules were not included in the lipid clusters. The yellow color of SPF/GF means the significance. Several bile acids were identified by authentic standards. Dot plots indicate the significantly changed genes only in SPF mice with aging. The p-value was calculated by Dunnett’s test (two-sided). *P < 0.05, **P < 0.01 against 2 months. N = 6 biologically independent samples where the results of male and female mice are recognized in the same group.
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Legends of Supplementary Tables, legends of Supplementary Data, and Supplementary Note showing the Lipidomics Minimal Reporting Checklist.
Supplementary Tables
Supplementary Tables 1–8. The legends are also listed in the Supplementary Information.
Supplementary Data 1
Lipidome results of biological samples.
Supplementary Data 2
Annotation results from LipidHunter and LipidMatch.
Supplementary Data 3
MS/MS spectral annotation for odd-chain fatty acid-containing lipids and oxidized phospholipids.
Supplementary Data 4
VIP values generated in OPLS-R.
Supplementary Data 5
Fecal microbiome results.
Supplementary Data 6
Kidney transcriptome results.
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Tsugawa, H., Ishihara, T., Ogasa, K. et al. A lipidome landscape of aging in mice. Nat Aging (2024). https://doi.org/10.1038/s43587-024-00610-6
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DOI: https://doi.org/10.1038/s43587-024-00610-6