Abstract
The gut microbiome is a malleable microbial community that can remodel in response to various factors, including diet, and contribute to the development of several chronic diseases, including atherosclerosis. We devised an in vitro screening protocol of the mouse gut microbiome to discover molecules that can selectively modify bacterial growth. This approach was used to identify cyclic d,l-
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Data availability
Source data for quantifications either mentioned in the text or shown in graphs are available upon reasonable request from the corresponding authors. RNA-seq data have been deposited in the Gene Expression Omibus under accession GSE104915, and 16S rRNA sequencing reads have been deposited in MG-RAST under accession 93528, 93529 and 93586.
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Acknowledgements
We gratefully acknowledge funding from the National Institutes of Health (NHLBI grants R01HL118114 and R01GM125984 to M.R.G., UL1TR001114 supporting B.M. and A.T. and U54GM114833 supporting A.T.), the Skaggs Institute of Chemical Biology and the American Heart Association (postdoctoral fellowships to Y.Z. and P.M.). We thank K. G. Andersen for discussions and protocols and G. Oliveira for technical assistance with sequencing. We thank C. S. Ryan, D. J. Search, R. A. Garcia and D. A. Gordon at Bristol Myers Squibb for carrying out pharmacokinetics and fecal dual isotope cholesterol absorption studies.
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All authors contributed to the design and planning of experiments. P.B.C, B.M., A.L.S. and A.T. planned and carried out bioinformatics analyses of 16S sequencing and RNA-seq data. A.S.B., P.M., G.A.M. and P.S. planned and carried out Treg studies. J.W. and W.C. carried out metabolomics experiments for SCFAs and amino acids. A.F.M.P. and A.S. planned and carried out metabolomics experiments for bile acids. P.B.C., A.S.B., P.M., Y.Z., A.L.S., N.M. and L.J.L. carried out all the other studies described. P.B.C., L.J.L. and M.R.G. wrote the manuscript. All authors provided critical feedback and helped shape the experimental analysis and manuscript. M.R.G. supervised the project.
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Extended data
Extended Data Fig. 1 Changes in gut microbiota composition due to WD feeding in vivo and peptide treatment in vitro.
a, The composition of gut microbiota from fecal samples of LDLr−/− mice after 2-wk feeding of CHD or WD. b, The alpha diversity (biodiversity) of gut microbiota from cecum of LDLr−/− mice cultured in vitro for 20 h with the indicated cyclic peptides (16
Extended Data Fig. 2 Composition of the cultured gut bacteria community from the en masse in vitro screen compared to the uncultured community.
The major observed taxa at the phylum and genus levels are labeled.
Extended Data Fig. 3 Cyclic D,L-α -peptides can affect the growth of individual bacteria or the composition of bacterial communities in vitro.
a, Heatmap showing minimum inhibitory concentration (MIC) values for the screened peptides against selected bacteria in vitro. The MIC for a given peptide against a given bacteria was defined as the lowest concentration of peptide that inhibited >90% of growth; lower MIC values correspond to greater antibacterial activity. The peptide groups shown at the top of the heatmap correspond to those identified from a pairwise comparison of the activities of different cyclic peptides in the en masse assay, each of which affected the microbiota differently from the other groups. Similar to the result from the en masse screen, peptides from different clusters showed the distinct effects against individual gut bacterial species in the MIC assay. Peptide c[wLwKhShK] (1), from peptide group I, broadly affected most of the bacterial species tested to some degree. In contrast, c[wLwReQeR] (11), from peptide group III, differentially affected bacterial species from Firmicutes and Bacteroidetes. Peptide 30 is an N-methylated analog of peptide 11, whereas 31 is a diastereomer of peptide 11. Because these disatereomeric and backbone N-methylated analogs cannot self-assemble into nanotubes, these peptides serve as mode-of-action controls that support the expected mechanism of bacterial growth modulation being dependent on peptide self-assembly and bacterial membrane activity. b, Bar graphs showing the relative abundance (genus level) of in vitro en masse screening samples treated with peptides 1, 11, or their analogs as mode-of-action controls. Peptides 1 and 11 were each screened in triplicate in the screen. ‘HCl salt’ refers to peptides that had been converted from the trifluoroacetate counterion salt (obtained after preparative HPLC) to the hydrochloride salt. ‘Trifluoroacetate’ refers to a sample treated with sodium trifluoroacetate (1 mM). The peptide HCl salts and trifluoroacetate samples were used to establish that trifluoroacetate itself (present as counterions with the screened peptides) does not affect microbiota composition. c, Principal component analysis for in vitro en masse screening samples treated with peptides 1, 11, or their analogs as mode-of-action controls (n = 3 independent samples each for peptide 1 and peptide 11, n = 1 for the other treatments shown). As expected, peptides 1 and 11 promoted distinct microbiota remodeling activity that were clustered for the replicate treatments along with their corresponding HCl salt and enantiomeric peptide (which can self-assemble). On the other hand, the diastereomeric or N-methylated analogs (which cannot self-assemble) did not substantially affect microbiota growth, as demonstrated by their clustering with the vehicle-treated and trifluoroacetate control samples.
Extended Data Fig. 4 Design rationale and structures for mechanism-of-action control peptides.
In the absence of backbone N-methylation, as in peptide 11, the flat ring-shaped cyclic conformation favors peptide stacking and inter-subunit backbone hydrogen bonding, giving rise to tubular ensembles that can perturb transmembrane ion gradients to exert antimicrobial activities. Backbone N-methylation on each face of the macrocycle, as in peptide 30 and 33, creates a dual effect that prevents peptide self-assembly and membrane/antimicrobial activity. The modified ring structure not only lacks two amide hydrogen bonding sites but is also incapable of ring stacking and inter-subunit hydrogen bonding as a result of steric clashes by the N-methyl moieties. Therefore, peptides 30 and 33 are interesting control and mechanism of action probes because of their inability to self-assemble and exert membrane and antimicrobial activity, despite having identical amino acid sequence as peptide 11. For clarity, side chains are omitted from the molecular models shown. Likewise, switching the stereochemistry of one of the amino acid side chains yields a diastereomer of the parent peptide. Diastereomers, such as peptides 31, 32, and 35 lack the flat ring-shaped cyclic conformation that favors peptide stacking, thus diminishing the propensity for self-assembly. On the other hand, the alternating arrangement of D- and L-amino acids is present in enantiomers of the parent peptides, such as 34 and 36, producing the flat ring-shaped cyclic conformation that favors peptide stacking.
Extended Data Fig. 5 Daily oral administration of cyclic peptides c[wLwReQeR] and c[wLwKhShK] for 10 weeks showed no toxicity in vivo.
a,b, The body weights of the mice during the 10-week cyclic peptide treatments did not differ from vehicle controls. Data are shown as mean ± SD. c-f, The liver weights (c,d) and spleen weights (e,f) of peptide-treated animals did not significantly differ from vehicle controls. g-j, Plasma levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) of peptide-treated animals did not significantly differ from vehicle controls, indicating the cyclic peptides did not cause liver damage or injury in the mice. In panels c-i, the horizontal line shows the mean. In all panels, n = 8 mice for WD + vehicle group in the c[wLwReQeR] study; n = 7 mice for WD + c[wLwReQeR] group; n = 9 mice for WD + vehicle group in the c[wLwKhShK] study; n = 7 mice for WD + c[wLwKhShK] group.
Extended Data Fig. 6 Quantitation of peptide levels in feces of treated mice.
a, Representative LCMS selected ion traces used to generate standard curves for determining the concentration of peptides in extracted mouse feces. The traces correspond to ion 1181.8 ([M-H]1−) for c[wLwReQeR] and ion 368.2 ([M + 3 H]3+) for c[wLwKhShK] at the peptide concentrations shown. Standard curves were generated from two independent extractions. b, Standard curves used for quantitation of c[wLwReQeR] and c[wLwKhShK] concentrations in the feces of treated mice. Data are shown as mean ± SD of n = 2 independent replicates for each concentration. c, Measured quantities of feces (dry weight after lyophilization of fecal pellets) excreted by individually-housed WD-fed LDLr−/− mice over 24-h periods (n = 32). Data are shown as mean ± SD. The observed mean ± SD value was 432 ± 61 mg feces/day/mouse. d, Measured levels of fully intact peptides in the 5-wk fecal samples of treated LDLr−/− mice (n = 4 animals per group). Each circle represents the average of duplicate measurements from a single animal. Data are given as mean ± SD of the values for the 4 animals in each group. The observed fecal concentrations of the fully-intact peptides of 1.0 ± 0.1 nmol peptide/mg feces and 0.9 ± 0.2 nmol peptide/mg feces for c[wLwReQeR] and c[wLwKhShK], respectively, represent greater than 50% of the level that would be expected assuming all of the administered peptide was excreted in the feces (~1.7 nmol peptide/mg feces). The estimated maximum fecal peptide concentration that would be expected assuming all of the administered peptide was excreted in the feces was calculated from the known concentration of peptide administered in the drinking water (0.18 mM), the average daily volume of treated drinking water consumed by each mouse (4.5 mL), and the average daily amount of feces excreted by each mouse (432 mg).
Extended Data Fig. 7 Effects of peptide treatment on bacterial composition and richness over time.
a, Comparative effects of cyclic D,L-
Extended Data Fig. 8 In vivo remodeling effects of cyclic D,L-α -peptides on the gut microbiota genera for which WD feeding caused significant changes in abundance compared to CHD.
a, Comparison of the bacterial genera observed to significantly differ (adusted p-value < 0.1, as determined by DESeq2 using a two-sided Wald test with adjustment for multiple comparisons using the Benjamini-Hochberg method) between WD-fed mice compared to CHD-fed mice from two independent animal studies (in both studies, n = 9 animals for CHD group and n = 8 animals for WD group). 18 genera were observed to differ significantly in common between the two independent studies. Eleven of the 18 genera became significantly more abundant and 7 genera became significantly less abundant after WD-feeding for two weeks. b, Heatmap showing the fold change of each of the 18 genera identified in panel (a) that differed in both independent in vivo studies. c, Plot of the abundance changes for the 18 genera identified in panel (a) for WD-feeding relative to CHD-feeding (red indicates more abundant in WD-fed animals and blue indicates less abundant in WD-fed animals). d, A heat map showing how oral peptide treatment affected the abundance of the 18 genera identified in panel (a). The negative correlation for c[wLwReQeR] against the bacteria that became more abundant in WD-feeding indicates that c[wLwReQeR] remodeled the gut microbiome by causing those genera to become less abundant. In contrast, c[wLwKhShK] treatment promoted the growth of the bacterial genera that became less abundant with WD-feeding, as indicated the positive correlation for c[wLwKhShK] against WD-less abundant genera. All microbiota samples in this figure were taken from 2-wk feces samples of LDLr−/− mice.
Extended Data Fig. 9 Cyclic peptide c[wLwReQeR] altered the gut microbiota transcriptome without drastically affecting the gut microbiota composition.
a, Peptide-mediated changes in gene expression could be grouped into three main clusters. Cluster 1 and Cluster 2 contained bacterial genes for which expression was increased or decreased, respectively, by peptide treatment. Cluster 3 contained genes that were altered by the WD compared the CHD, but not affected by peptide treatment. The Venn diagram reports the number of bacterial species having transcripts within each cluster. The majority of species had transcripts within each cluster, indicative of broad transcriptomic changes across the gut microbiome. b, Gene expression levels from each bacterial phylum for the three gene expression Clusters. RNA expression was increased from Bacteroidetes and decreased from Firmicutes in Cluster 1 compared to Cluster 2 or Cluster 3. c, Bacterial functions of the gut microbiome, as predicted by transcriptome analysis of feces samples from CHD fed mice. The values shown are the percentage of reads from the transcriptome analysis belonging to each category.
Extended Data Fig. 10 Comparison of gut microbiome gene expression levels for metabolic processes among the different treatment groups.
The graph shows gene expression levels of various metabolic processes for the CHD, WD, or c[wLwReQeR]-treated animals, as determined by RNA-Seq analysis of fecal samples taken after a 2-wk treatment period.
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Chen, P.B., Black, A.S., Sobel, A.L. et al. Directed remodeling of the mouse gut microbiome inhibits the development of atherosclerosis. Nat Biotechnol 38, 1288–1297 (2020). https://doi.org/10.1038/s41587-020-0549-5
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DOI: https://doi.org/10.1038/s41587-020-0549-5
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