Abstract
Metabolites derived from the intestinal microbiota, including bile acids (BA), extensively modulate vertebrate physiology, including development1, metabolism2,3,4, immune responses5,6,7 and cognitive function8. However, to what extent host responses balance the physiological effects of microbiota-derived metabolites remains unclear9,10. Here, using untargeted metabolomics of mouse tissues, we identified a family of BA–methylcysteamine (BA–MCY) conjugates that are abundant in the intestine and dependent on vanin 1 (VNN1), a pantetheinase highly expressed in intestinal tissues. This host-dependent MCY conjugation inverts BA function in the hepatobiliary system. Whereas microbiota-derived free BAs function as agonists of the farnesoid X receptor (FXR) and negatively regulate BA production, BA–MCYs act as potent antagonists of FXR and promote expression of BA biosynthesis genes in vivo. Supplementation with stable-isotope-labelled BA–MCY increased BA production in an FXR-dependent manner, and BA–MCY supplementation in a mouse model of hypercholesteraemia decreased lipid accumulation in the liver, consistent with BA–MCYs acting as intestinal FXR antagonists. The levels of BA–MCY were reduced in microbiota-deficient mice and restored by transplantation of human faecal microbiota. Dietary intervention with inulin fibre further increased levels of both free BAs and BA–MCY levels, indicating that BA–MCY production by the host is regulated by levels of microbiota-derived free BAs. We further show that diverse BA–MCYs are also present in human serum. Together, our results indicate that BA–MCY conjugation by the host balances host-dependent and microbiota-dependent metabolic pathways that regulate FXR-dependent physiology.
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Data availability
Source data for Figs. 2–5 and Extended Data Figs. 2, 3 and 5–12 are provided with this paper. Raw sequencing reads were uploaded to the Sequence Read Archive under accession number BioProject PRJNA761331, and mass spectrometry data for all mouse metabolome samples analysed in this study are available on the GNPS website (https://massive.ucsd.edu) under MassIVE ID number MSV000090974. Source data are provided with this paper.
Code availability
The custom Fiji script used for the analysis of liver lipid accumulation imaging is available on Zenodo69 (https://doi.org/10.5281/zenodo.14031611).
References
Robertson, R. C., Manges, A. R., Finlay, B. B. & Prendergast, A. J. The human microbiome and child growth — first 1000 days and beyond. Trends Microbiol. 27, 131–147 (2019).
Fuchs, C. D. & Trauner, M. Role of bile acids and their receptors in gastrointestinal and hepatic pathophysiology. Nat. Rev. Gastroenterol. Hepatol. 19, 432–450 (2022).
Thomas, C., Pellicciari, R., Pruzanski, M., Auwerx, J. & Schoonjans, K. Targeting bile-acid signalling for metabolic diseases. Nat. Rev. Drug Discov. 7, 678–693 (2008).
Wahlstrom, A., Sayin, S. I., Marschall, H. U. & Backhed, F. Intestinal crosstalk between bile acids and microbiota and its impact on host metabolism. Cell Metab. 24, 41–50 (2016).
Belkaid, Y. & Hand, T. W. Role of the microbiota in immunity and inflammation. Cell 157, 121–141 (2014).
Blander, J. M., Longman, R. S., Iliev, I. D., Sonnenberg, G. F. & Artis, D. Regulation of inflammation by microbiota interactions with the host. Nat. Immunol. 18, 851–860 (2017).
Hang, S. Y. et al. Bile acid metabolites control TH17 and Treg cell differentiation. Nature 576, 143–148 (2019).
Morais, L. H., Schreiber, H. L. T. & Mazmanian, S. K. The gut microbiota–brain axis in behaviour and brain disorders. Nat. Rev. Microbiol. https://doi.org/10.1038/s41579-020-00460-0 (2020).
Fan, Y. & Pedersen, O. Gut microbiota in human metabolic health and disease. Nat. Rev. Microbiol. 19, 55–71 (2021).
Nicholson, J. K. et al. Host–gut microbiota metabolic interactions. Science 336, 1262–1267 (2012).
Martin, A. M., Sun, E. W., Rogers, G. B. & Keating, D. J. The influence of the gut microbiome on host metabolism through the regulation of gut hormone release. Front. Physiol. 10, 428 (2019).
Molinaro, A., Wahlstrom, A. & Marschall, H. U. Role of bile acids in metabolic control. Trends Endocrinol. Metab. 29, 31–41 (2018).
Ramírez-Pérez, O., Cruz-Ramón, V., Chinchilla-López, P. & Méndez-Sánchez, N. The role of the gut microbiota in bile acid metabolism. Ann. Hepatol. 16, s15–s20 (2017).
Wang, H., Chen, J., Hollister, K., Sowers, L. C. & Forman, B. M. Endogenous bile acids are ligands for the nuclear receptor FXR/BAR. Mol. Cell 3, 543–553 (1999).
Claudel, T., Staels, B. & Kuipers, F. The farnesoid X receptor — a molecular link between bile acid and lipid and glucose metabolism. Arterioscler. Thromb. Vasc. Biol. 25, 2020–2031 (2005).
Jiang, L., Zhang, H., Xiao, D., Wei, H. & Chen, Y. Farnesoid X receptor (FXR): structures and ligands. Comput. Struct. Biotechnol. J. 19, 2148–2159 (2021).
Johnson, M. R., Barnes, S., Kwakye, J. B. & Diasio, R. B. Purification and characterization of bile acid-CoA:amino acid N-acyltransferase from human liver. J. Biol. Chem. 266, 10227–10233 (1991).
Killenberg, P. G. & Jordan, J. T. Purification and characterization of bile acid-CoA:amino acid N-acyltransferase from rat liver. J. Biol. Chem. 253, 1005–1010 (1978).
Funabashi, M. et al. A metabolic pathway for bile acid dehydroxylation by the gut microbiome. Nature 582, 566–570 (2020).
White, B. A., Lipsky, R. L., Fricke, R. J. & Hylemon, P. B. Bile acid induction specificity of 7α-dehydroxylase activity in an intestinal Eubacterium species. Steroids 35, 103–109 (1980).
Jones, B. V., Begley, M., Hill, C., Gahan, C. G. & Marchesi, J. R. Functional and comparative metagenomic analysis of bile salt hydrolase activity in the human gut microbiome. Proc. Natl Acad. Sci. USA 105, 13580–13585 (2008).
Ridlon, J. M., Harris, S. C., Bhowmik, S., Kang, D. J. & Hylemon, P. B. Consequences of bile salt biotransformations by intestinal bacteria. Gut Microbes 7, 22–39 (2016).
Pandak, W. M. & Kakiyama, G. The acidic pathway of bile acid synthesis: not just an alternative pathway. Liver Res. 3, 88–98 (2019).
Sayin, S. I. et al. Gut microbiota regulates bile acid metabolism by reducing the levels of tauro-β-muricholic acid, a naturally occurring FXR antagonist. Cell Metab. 17, 225–235 (2013).
Sun, L. et al. Gut microbiota and intestinal FXR mediate the clinical benefits of metformin. Nat. Med. 24, 1919–1929 (2018).
Makishima, M. et al. Identification of a nuclear receptor for bile acids. Science 284, 1362–1365 (1999).
Reschly, E. J. et al. Evolution of the bile salt nuclear receptor FXR in vertebrates. J. Lipid Res. 49, 1577–1587 (2008).
Chiang, J. Y. Bile acids: regulation of synthesis. J. Lipid Res. 50, 1955–1966 (2009).
Brandman, O. & Meyer, T. Feedback loops shape cellular signals in space and time. Science 322, 390–395 (2008).
Tautenhahn, R., Patti, G. J., Rinehart, D. & Siuzdak, G. XCMS Online: a web-based platform to process untargeted metabolomic data. Anal. Chem. 84, 5035–5039 (2012).
Helf, M. J., Fox, B. W., Artyukhin, A. B., Zhang, Y. K. & Schroeder, F. C. Comparative metabolomics with Metaboseek reveals functions of a conserved fat metabolism pathway in C. elegans. Nat. Commun. 13, 782 (2022).
Arifuzzaman, M. et al. Inulin fibre promotes microbiota-derived bile acids and type 2 inflammation. Nature https://doi.org/10.1038/s41586-022-05380-y (2022).
Singh, V. et al. Dysregulated microbial fermentation of soluble fiber induces cholestatic liver cancer. Cell 175, 679–694.e22 (2018).
Naquet, P., Kerr, E. W., Vickers, S. D. & Leonardi, R. Regulation of coenzyme A levels by degradation: the ‘ins and outs’. Prog. Lipid Res. 78, 101028 (2020).
Hunt, M. C., Siponen, M. I. & Alexson, S. E. The emerging role of acyl-CoA thioesterases and acyltransferases in regulating peroxisomal lipid metabolism. Biochim. Biophys. Acta 1822, 1397–1410 (2012).
Neugebauer, K. A. et al. BAAT gene knockout alters early life development and the gut microbiome and reveals unusual bile acids in mice. J. Lipid Res. 63, 100297 (2022).
Bartucci, R., Salvati, A., Olinga, P. & Boersma, Y. L. Vanin 1: its physiological function and role in diseases. Int. J. Mol. Sci. 20, 3891 (2019).
Kaskow, B. J., Proffitt, J. M., Blangero, J., Moses, E. K. & Abraham, L. J. Diverse biological activities of the vascular non-inflammatory molecules — the vanin pantetheinases. Biochem. Biophys. Res. Commun. 417, 653–658 (2012).
Yu, H. et al. Vanin1 (VNN1) in chronic diseases: future directions for targeted therapy. Eur. J. Pharmacol. 962, 176220 (2024).
Yao, L. et al. A selective gut bacterial bile salt hydrolase alters host metabolism. eLife https://doi.org/10.7554/eLife.37182 (2018).
Al-Dury, S., Wahlstrom, A., Stahlman, M., Backhed, F. & Marschall, H. U. Cyp3a11 is dispensable for the formation of murine bile acids. J. Hepatol. 64, S436 (2016).
Guzior, D. V. et al. Bile salt hydrolase acyltransferase activity expands bile acid diversity. Nature https://doi.org/10.1038/s41586-024-07017-8 (2024).
Quinn, R. A. et al. Global chemical effects of the microbiome include new bile-acid conjugations. Nature 579, 123–129 (2020).
Voegel, J. J., Heine, M. J., Zechel, C., Chambon, P. & Gronemeyer, H. TIF2, a 160 kDa transcriptional mediator for the ligand-dependent activation function AF-2 of nuclear receptors. EMBO J. 15, 3667–3675 (1996).
Willson, T. M., Jones, S. A., Moore, J. T. & Kliewer, S. A. Chemical genomics: functional analysis of orphan nuclear receptors in the regulation of bile acid metabolism. Med. Res. Rev. 21, 513–522 (2001).
Jiang, C. et al. Intestine-selective farnesoid X receptor inhibition improves obesity-related metabolic dysfunction. Nat. Commun. 6, 10166 (2015).
Inagaki, T. et al. Fibroblast growth factor 15 functions as an enterohepatic signal to regulate bile acid homeostasis. Cell Metab. 2, 217–225 (2005).
Kim, I. et al. Differential regulation of bile acid homeostasis by the farnesoid X receptor in liver and intestine. J. Lipid Res. 48, 2664–2672 (2007).
Gonzalez, F. J., Jiang, C., Xie, C. & Patterson, A. D. Intestinal farnesoid X receptor signaling modulates metabolic disease. Dig. Dis. 35, 178–184 (2017).
Cheng, K. et al. Diminished gallbladder filling, increased fecal bile acids, and promotion of colon epithelial cell proliferation and neoplasia in fibroblast growth factor 15-deficient mice. Oncotarget 9, 25572–25585 (2018).
Ito, S. et al. Impaired negative feedback suppression of bile acid synthesis in mice lacking betaKlotho. J. Clin. Invest. 115, 2202–2208 (2005).
Kuang, J. L. et al. Hyodeoxycholic acid alleviates non-alcoholic fatty liver disease through modulating the gut–liver axis. Cell Metab. 35, 1752–1766.e8 (2023).
Song, X. Y. et al. Microbial bile acid metabolites modulate gut RORγ+ regulatory T cell homeostasis. Nature 577, 410–415 (2020).
Campbell, C. et al. Bacterial metabolism of bile acids promotes generation of peripheral regulatory T cells. Nature 581, 475–479 (2020).
Einarsson, C., Hillebrant, C. G. & Axelson, M. Effects of treatment with deoxycholic acid and chenodeoxycholic acid on the hepatic synthesis of cholesterol and bile acids in healthy subjects. Hepatology 33, 1189–1193 (2001).
Li, C. et al. Farnesoid X receptor agonists as therapeutic target for cardiometabolic diseases. Front. Pharmacol. 11, 1247 (2020).
Ali, A. H., Carey, E. J. & Lindor, K. D. Recent advances in the development of farnesoid X receptor agonists. Ann. Transl. Med. 3, 5 (2015).
Ferrell, J. M. & Chiang, J. Y. L. Understanding bile acid signaling in diabetes: from pathophysiology to therapeutic targets. Diabetes Metab. J. 43, 257–272 (2019).
Li, T. & Apte, U. Bile acid metabolism and signaling in cholestasis, inflammation, and cancer. Adv. Pharmacol. 74, 263–302 (2015).
Mahanti, P. et al. Comparative metabolomics reveals endogenous ligands of DAF-12, a nuclear hormone receptor, regulating C. elegans development and lifespan. Cell Metab. 19, 73–83 (2014).
Pitari, G. et al. Pantetheinase activity of membrane-bound vanin-1: lack of free cysteamine in tissues of vanin-1 deficient mice. FEBS Lett. 483, 149–154 (2000).
Hepworth, M. R. et al. Immune tolerance. Group 3 innate lymphoid cells mediate intestinal selection of commensal bacteria-specific CD4+ T cells. Science 348, 1031–1035 (2015).
Letourneau, J. et al. Ecological memory of prior nutrient exposure in the human gut microbiome. ISME J. 16, 2479–2490 (2022).
Goc, J. et al. Dysregulation of ILC3s unleashes progression and immunotherapy resistance in colon cancer. Cell 184, 5015–5030.e16 (2021).
Tautenhahn, R., Bottcher, C. & Neumann, S. Highly sensitive feature detection for high resolution LC/MS. BMC Bioinformatics 9, 504 (2008).
Wang, M. et al. Sharing and community curation of mass spectrometry data with Global Natural Products Social Molecular Networking. Nat. Biotechnol. 34, 828–837 (2016).
Shannon, P. et al. Cytoscape: a software environment for integrated models of biomolecular interaction networks. Genome Res. 13, 2498–2504 (2003).
Zhang, B. et al. Acylspermidines are conserved mitochondrial sirtuin-dependent metabolites. Nat. Chem. Biol. 20, 812–822 (2024).
Parkhurst, C. Fiji oil red O macro. Zenodo https://doi.org/10.5281/zenodo.14031611 (2024).
Acknowledgements
We thank members of the Schroeder and Artis laboratories for discussion and critical reading of the manuscript; B. Fox for assistance with mass spectrometry; and all contributing members of the JRI IBD Live Cell Bank consortium, which is supported by the Jill Roberts Institute for Research in IBD, the Jill Roberts Center for IBD, Cure for IBD, the Rosanne H. Silbermann Foundation, the Sanders Family, and the WCM Division of Pediatric Gastroenterology and Nutrition. The schematics in Fig. 1a were created using BioRender (https://biorender.com). All chemical structures were created with ChemDraw. This work was supported by the Crohn’s & Colitis Foundation (to M.A.), the Thomas C. King Pulmonary Fellowship, the WCM Fund for the Future, the Sackler Brain and Spine Institute Research Grant, and a Brain and Behavior Research Foundation (NARSAD) Young Investigator Award (all to C.N.P.), Office of Naval Research grant N00014-18-1-2616 (to L.A.D.), the Howard Hughes Medical Institute (to F.C.S.), Kenneth Rainin Foundation and the W. M. Keck Foundation (all to C.-J.G.), The Global Grants for Gut Health co-supported by Yakult and Nature Research (to R.A.Q.), the AGA Research Foundation, the WCM-RAPP Initiative, Cure for IBD, the Jill Roberts Institute for Research in IBD, the Kenneth Rainin Foundation, the Sanders Family Foundation, the Rosanne H. Silbermann Foundation, the Glenn Greenberg and Linda Vester Foundation, the Allen Discovery Center Program, a Paul G. Allen Frontiers Group advised program of the Paul G. Allen Family Foundation (all to D.A.), and the US National Institutes of Health (K99AI173660 to M.A., K08MH130773 and NIAID Mucosal Immunology Studies Team Young Investigator Award to C.N.P., GM131877 to F.C.S., DK116187 to L.A.D., DK140854 to R.A.Q., DP2 HD101401 and DK135816 to C.-J.G., and DK126871, AI151599, AI095466, AI095608, AR070116, AI172027 and DK132244 to D.A.).
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D.A. and F.C.S. supervised the study. T.H.W. carried out the metabolomics and chemical synthesis and analysed most of the data. C.N.P. and M.A. conducted all animal experiments. W.-B.J. and C.-J.G. provided the bacterial strains and helped with the monocolonization experiments. S.K., E.H. and I.C.M. helped with the mouse experiments and various other assays. B.Z. assisted with the metabolomic analyses and conducted the VNN1 assays. J.L. and L.A.D. provided the human samples. Y.F., D.V.G. and R.A.Q. provided the Baat-knockout mouse metabolome samples and data analysis, as well as microbial analyses. The JRI Live Cell Bank contributed to clinical sample acquisition, annotation, processing and evaluation. T.H.W., M.A., C.N.P., D.A. and F.C.S. analysed the data and wrote the manuscript with input from all co-authors.
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D.A. has contributed to scientific advisory boards at Pfizer, Takeda, Nemagene and the Kenneth Rainin Foundation. F.C.S. is a cofounder of Ascribe Bioscience and Holoclara Inc., and a member of the scientific advisory board of Hexagon Bio. The other authors declare no competing interests.
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Extended data figures and tables
Extended Data Fig. 1 MS2 spectra of MCY conjugates of BAs.
a-e, MS2 spectra of CA-MCY (a), CDCA-MCYO (b), CA-MCYO (c), 7KDCA-MCYO (d), and CA-MCYO2 (e). The listed BA-MCY conjugates in each panel produced MS2 spectra very similar to the shown examples. Blue arrows indicate inferred fragmentation. MS2 fragments and structure parts highlighted in red represent MCY groups. Green fragments are derived from water loss.
Extended Data Fig. 2 Microbiota dependent production of BA-taurine and BA-MCY conjugates.
a, Relative abundances of BA-MCYO conjugates of less abundant BAs in serum of SPF (n = 11) and GF (n = 12), and mice that received FMT (n = 10, the three donors are represented by triangles, circles, and crosses, n = 3-4 for each donor). b,c, Relative abundances of CA-MCY conjugates (b) and βMCA-MCY conjugates (c) as well as the corresponding free BAs in feces of SPF mice (n = 3), GF mice (n = 3), and mice that received FMT (n = 10, the three donors are represented by triangles, circles, and crosses, n = 3-4 for each donor). N.D., not detected. d, Relative abundances of BA-MCYO conjugates of less abundant BAs in feces of SPF (n = 3) and GF (n = 3), and mice that received FMT (n = 10, the three donors are represented by triangles, circles, and crosses, n = 3-4 for each donor). e, Relative abundances of BA-taurine conjugates in serum or feces of SPF (n = 11 for serum and n = 3 for feces) and GF (n = 12 for serum and n = 3 for feces), and mice that received FMT (n = 10, the three donors are represented by triangles, circles, and crosses, n = 3-4 for each donor). f,g, Relative abundances of free BAs in serum (f) or feces (g) of SPF (n = 11 for serum and n = 3 for feces) and GF (n = 12 for serum and n = 3 for feces), and mice that received FMT (n = 10, the three donors are represented by triangles, circles, and crosses, n = 3-4 for each donor). Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction.
Extended Data Fig. 3 Relationship between abundances of free BAs and BA-MCY conjugates.
a,b, Relative abundances of CA-MCY (a) and βMCA-MCY conjugates (b) as well as corresponding free BAs in serum of mice fed control (n = 8) or inulin fiber diet (n = 7). c, Relative abundances of BA-MCYO conjugates as well as corresponding free BAs in serum of mice fed control (n = 8) or inulin fiber diet (n = 7). d, Relationship between abundances of free BAs and BA-MCY conjugates in feces of SPF mice used as control for the FMT study (n = 25), FMT mice (n = 10), SPF mice fed a control diet for the inulin fiber diet study (n = 6), and inulin fiber diet fed SPF mice (n = 8). e, Relationship between abundances of free BAs and BA-MCY conjugates in serum of SPF as control for the FMT study (n = 11), FMT mice (n = 10), SPF mice fed a control diet for the inulin fiber diet study (n = 8), and inulin fiber diet fed SPF mice (n = 7). f,g, Relative abundances of free BAs (f) and corresponding BA-MCY conjugates (g) in serum of human (n = 19). Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction.
Extended Data Fig. 4 Analysis of stable-isotope feeding experiments.
a, Administration of taurine-d4 in SPF mice resulted in deuterium incorporation in all detected taurine conjugates, but not in any MCY conjugates. Shown are EICs for the m/z of molecular ions of unlabeled (black) and deuterium-labeled versions (red) of the different conjugates in serum of mouse fed taurine-d4. b, Administration of deuterium-labeled L-cysteine (L-cys-d2) in SPF mice resulted in deuterium incorporation in the MCY conjugates of BAs. Shown are EICs for the m/z of the molecular ions of the unlabeled (black) and the deuterium-labeled versions of BA-MCY conjugates (red) detected in serum of mice fed L-cys-d2. c,d, Administration of deuterium-labeled L-cysteine (L-cys-d2) in SPF mice (see Fig. 2i) resulted in deuterium incorporation in taurine conjugates of BAs (c) and pantetheine (d). EICs for molecular ion peaks (black) and deuterium isotope peaks (red) of taurine conjugates of BAs (c) and pantetheine (d) in serum of mouse fed L-cys-d2.
Extended Data Fig. 5 Analysis of Baat−/− mice.
a-d, Extracted ion chromatograms (EICs) of BA-MCY and BA-MCYO conjugates (a,b,c) and BA-MCYO2 conjugates (d) in liver of Baat−/− mice and comparison with synthetic standards analyzed in ESI + . e,f, Relative abundances of BA-MCY conjugates (e) and corresponding free BAs (f) in liver of WT (n = 4) or Baat−/− (n = 5) mice. Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. N.D., not detected.
Extended Data Fig. 6 Abundances of BA-MCY conjugates in different tissues.
a,b, Abundances of CA-MCY conjugates, TCA and CA (a), and βMCA-MCY conjugates, TβMCA and βMCA (b) in liver, small intestine, and cecum of SPF (n = 11) and GF (n = 12 for liver and n = 13 for small intestine and cecum) mice. Data are mean ± s.e.m. c–f, Abundances of UDCA-MCY conjugates and UDCA (c), CDCA-MCY conjugates and CDCA (d), DCA-MCY conjugates and DCA (e), and 7-KDCA-MCY conjugates and 7-KDCA (f) in liver, small intestine, and cecum of SPF (n = 11) and GF (n = 12 for liver and n = 13 for small intestine and cecum) mice. Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. N.D., not detected.
Extended Data Fig. 7 The role of VNN1 in production of BA-MCY conjugates.
a, Steady-state kinetic analysis of CA-pant and pantetheine hydrolysis catalyzed by recombinant human VNN1 (ΔN490aa truncated) revealed both reactions follow saturation kinetics. The steady-state kinetic parameters Km and Vmax are determined by HPLC-HRMS for pantothenic acid formation to be 39.78 ± 20.31 μM and 1.53 ± 0.20 min−1 for CA-pant, and 74.07 ± 41.52 μM and 2.13 ± 0.37 min−1 for pantetheine. The reaction mixtures contain 0.01 μM VNN1. Number of independent assays using the same batch of enzyme (n = 3). Data are mean ± s.d. b, EICs of CA-CY in ileum of Baat−/− mice, extracts of in vitro reaction of VNN1 hydrolyses CA-pantetheine, and comparison with a synthetic standard analyzed in ESI + . c, EICs of CA-pant in small intestine of Vnn1−/− mice and comparison with a synthetic standard analyzed in ESI + . d, Relative abundances of CA-pant in small intestine, feces, liver, and serum of WT (n = 5) and Vnn1−/− (n = 5) mice. Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. N.D., not detected.
Extended Data Fig. 8 Microbial deconjugation of BA-MCYs in SPF, GF, and ABX mice.
a, Ratio of total BA-taurine or BA-MCY conjugates to corresponding free BAs in feces of SPF (n = 14) and GF (n = 16) mice. Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. b,c, Total amounts of free BAs (b) or BA-MCY conjugates (c) in feces of SPF (n = 14) and GF (n = 16) mice. Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. d, Total amounts of free BAs and BA-MCY conjugates in feces of GF (n = 16) mice. Data are mean ± s.e.m. P values were calculated using paired two-sided Student’s t-test. e, HRMS analysis of feces of mice fed CDCA-d5-MCY revealed deconjugation of supplemented CDCA-d5-MCY, represented by peaks in the CDCA mass spectrum highlighted in red. Endogenously produced CDCA can be distinguished, highlighted in green. CA remained unlabeled. f–h, Total amounts of labeled free BAs (f), BA-MCY conjugates (g), and BA-taurine conjugates (h) in feces of SPF (n = 14), ABX (n = 15), and GF (n = 3) mice administered CDCA-d5-MCY. i, Volcano plot of differential metabolites detected in liver of SPF mice administered control (corn oil) (n = 4) or CDCA-d5-MCY (n = 5). Bubble sizes reflect peak areas. See Supplementary Table 4 for compounds derived from supplemented CDCA-d5-MCY. P values were calculated using unpaired two-sided Student’s t-test. j–l, Total amounts of labeled free BAs (j), BA-MCY conjugates (k), and BA-taurine conjugates (l) in liver of SPF (n = 5) and ABX (n = 5) mice administered CDCA-d5-MCY. m, Volcano plot of differential metabolites detected in liver of ABX mice administered control (corn oil) (n = 4) or CDCA-d5-MCY (n = 5). Bubble sizes reflect peak areas. See Supplementary Table 4 for compounds derived from supplemented CDCA-d5-MCY. P values were calculated using unpaired two-sided Student’s t-test.
Extended Data Fig. 9 Microbial deconjugation of BA-MCYs in vitro and gnotobiotic mice.
a,b, Deconjugation of CA-MCY conjugates in fecal suspensions obtained from SPF mice (a) (n = 3) and cultured gut bacteria (b) (n = 3). c, Relative abundances of CDCA-d5-MCY conjugates and corresponding free BA in feces of GF monocolonized with WT (n = 3) or BSH-deficient B. ovatus (n = 3) (WT Bo and Δbsh Bo, respectively). Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction.
Extended Data Fig. 10 FXR-related activity of known ligands and BA-MCYs.
a, βMCA-MCY was tested against a cell-based protein-protein interaction assays in both agonist and antagonist modes. βMCA-MCY showed strong FXR antagonistic effects to GW4604-mediated activation of FXR. βMCA-MCY showed no FXR agonistic effects in the assay. Assays were performed in duplicate for each concentration. b, FXR agonistic effect of CDCA as measured in the protein-protein interaction assays. Data were normalized to the maximal and minimal response observed in the presence of control compound (GW4064) and vehicle (DMSO), respectively. Assays were performed in duplicate for each concentration. c,d, CDCA-MCY showed FXR antagonistic effects to obeticholic acid (25 μM) (c) or CDCA (25 μM) (d) mediated activation of FXR. Data were normalized to the maximal and minimal response observed in the presence of control compound (DY268) and vehicle (DMSO), respectively. Assays were performed in duplicate for each concentration. e–g, Cytotoxicity assays for CDCA-MCY (e), CDCA-MCYO (f), and CDCA (g) in a cell-based assay on human primary hepatocytes. Assays were performed in duplicate for each concentration. h, TβMCA did not show FXR antagonistic effects in protein-protein interaction assays at the tested concentrations. DY268 a synthetic FXR antagonist was used as a positive control. Data were normalized to the maximal and minimal response observed in the presence of control compound (DY268) and vehicle (DMSO), respectively. Assays were performed in duplicate for each concentration.
Extended Data Fig. 11 Regulation of BA biosynthesis by BA-MCYs in vivo.
a,b, Abundances of endogenously produced BAs in feces of mice administered CDCA-MCY or CDCA-d5-MCY daily for 14 days. Shown are individual amounts of CDCA-derived BAs (a) and CA-derived BAs (b) in feces. Data are mean ± s.e.m. with control (corn oil) (n = 7) and CDCA-MCY fed mice (n = 7 for CDCA-derived pathway and n = 3 for CA-derived pathway). P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. c, Total endogenously produced BAs in feces of ABX mice administered CDCA-d5-MCY. Shown are total amounts of BAs (n = 13 for control and n = 14 for CDCA-MCY fed mice). Data are mean ± s.e.m. P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. d,e, Abundances of CDCA-derived BAs (d) and CA-derived BAs (e) in liver of mice administered CDCA-MCY or CDCA-d5-MCY daily for 14 days. Data are mean ± s.e.m. with control (corn oil) (n = 6) and CDCA-MCY fed mice (n = 3 for CDCA-derived pathway and n = 7 for CA-derived pathway). P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. f,g, Abundances of CDCA-derived BAs (f) and CA-derived BAs (g) in serum of mice administered CDCA-MCY or CDCA-d5-MCY daily for 14 days. Data are mean ± s.e.m. with control (corn oil) (n = 6) and CDCA-MCY fed mice (n = 3 for CDCA-derived pathway and n = 7 for CA-derived pathway). P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction.
Extended Data Fig. 12 FXR-related activity of BA-MCYs in vivo.
a,b, Abundances of total BAs in liver (a) and serum (b) of WT and Nr1h4−/− mice administered CDCA-d5-MCY daily for 14 days. Data are mean ± s.e.m. with control (corn oil) (n = 4) and CDCA-d5-MCY fed mice (n = 4). P values were calculated using unpaired two-sided Student’s t-test with Welch’s correction. c, Representative photomicrographs of oil red O staining of liver sections of mice treated with the indicated conditions. Mice were fed control (n = 4 for vehicle and n = 4 for CDCA-MCY) or high cholesterol diet (HCD) (n = 4 for vehicle and n = 4 for CDCA-MCY). CDCA-MCY was delivered by oral gavage at a rate of 5 mg/kg body weight per day for two weeks. Scale bar, 100 μm. d, Average measured oil red O area of liver sections of mice in c. Data are mean ± s.e.m. P values were calculated using one-way ANOVA with Tukey’s correction.
Supplementary information
Supplementary Information
This file contains Supplementary Methods, Supplementary Tables 2 and 5, Supplementary Figs 1–5, Supplementary Note, and descriptions for Supplementary Tables 1, 3, and 4 (tables supplied separately).
Supplementary Table 1
MS features whose production is microbiota-dependent in serum.
Supplementary Table 3
Abundance of BA-taurine, BA-MCY conjugates, and free BAs in serum, feces, liver, small intestine, and cecum of SPF, GF mice, and mice that received FMT.
Supplementary Table 4
MS features that were derived from supplemented CDCA-d5-MCY in SPF and ABX mice.
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Won, T.H., Arifuzzaman, M., Parkhurst, C.N. et al. Host metabolism balances microbial regulation of bile acid signalling. Nature (2025). https://doi.org/10.1038/s41586-024-08379-9
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DOI: https://doi.org/10.1038/s41586-024-08379-9