Abstract
Brown adipose tissue (BAT) and beige fat function in energy expenditure in part due to their role in thermoregulation, making these tissues attractive targets for treating obesity and metabolic disorders. While prolonged cold exposure promotes de novo recruitment of brown adipocytes, the exact sources of cold-induced thermogenic adipocytes are not completely understood. Here, we identify transient receptor potential cation channel subfamily V member 1 (Trpv1)+ vascular smooth muscle (VSM) cells as previously unidentified thermogenic adipocyte progenitors. Single-cell RNA sequencing analysis of interscapular brown adipose depots reveals, in addition to the previously known platelet-derived growth factor receptor (Pdgfr)α-expressing mesenchymal progenitors, a population of VSM-derived adipocyte progenitor cells (VSM-APC) expressing the temperature-sensitive cation channel Trpv1. We demonstrate that cold exposure induces the proliferation of Trpv1+ VSM-APCs and enahnces their differentiation to highly thermogenic adipocytes. Together, these findings illustrate the landscape of the thermogenic adipose niche at single-cell resolution and identify a new cellular origin for the development of brown and beige adipocytes.
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Data availability
The authors declare that the data supporting the findings of this study are available within the paper and the Supplementary Information. scRNA-seq data were deposited at the Gene Expression Omnibus (GSE160585).
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Acknowledgements
This work was supported in part by the US National Institutes of Health (grants R01DK077097, R01DK102898, R01DK122808 (to Y.-H.T.), K01DK125608 (to F.S.) and K01DK111714 (to M.D.L)), P30DK036836 (to Joslin Diabetes Center’s Diabetes Research Center) from the National Institute of Diabetes and Digestive and Kidney Diseases, grant 1-18-PDF-169 (to F.S.) from the American Diabetes Association and CZF2019-002454 from the Chan Zuckerberg Foundation (to Y.-H.T. and A.S.). Work by M.P. at the Harvard Chan Bioinformatics Core was funded by the Harvard Stem Cell Institute’s Center for Stem Cell Bioinformatics. We thank A. Marotta for technical assistance.
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F.S. and Y.-H.T. designed and conducted the scRNA-seq study. F.S., M.D.L. and Y.-H.T. designed and conducted the lineage-tracing experiments and wrote the manuscript. M.P. conducted the scRNA-seq analyses. L.-L.H. assisted in single-cell isolation and library preparation. T.L.H. provided technical assistance. A.G. and A.S. analysed human single-nuclei RNA-seq data. All authors read and approved the final manuscript.
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Peer review information Nature Metabolism thanks Kosaku Shinoda, Christian Wolfrum and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editor: George Caputa.
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Extended data
Extended Data Fig. 1 Characterization of cell types present in the BAT-SVF, related to Fig. 1.
Individual gene UMAP plots showing the expression levels and distribution of representative marker genes for each cell type.
Extended Data Fig. 2 Cold-induced transcriptional changes in BAT endothelial and schwann cells, related to Fig. 1.
a, Gene ontology (GO) enrichment analysis of the transcripts significantly upregulated in capillary endothelial cells by cold. b, Violin plots showing the expression levels and distribution of representative upregulated transcripts for the selected GO terms. c, Gene ontology (GO) enrichment analysis of the transcripts significantly downregulated in capillary endothelial cells by cold. d, Violin plots showing the expression levels and distribution of representative downregulated transcripts for the selected GO terms. e, Gene ontology (GO) enrichment analysis of the transcripts significantly upregulated in schwann cells by cold. f, Violin plots showing the expression levels and distribution of representative upregulated transcripts for the selected GO terms. g, Gene ontology (GO) enrichment analysis of the transcripts significantly downregulated in schwann cells by cold. h, Violin plots showing the expression levels and distribution of representative downregulated transcripts for the selected GO terms.
Extended Data Fig. 3 Cold-induced transcriptional changes in vascular smooth muscles of BAT, related to Fig. 1.
a, Gene ontology (GO) enrichment analysis of the transcripts significantly upregulated in vascular smooth muscles by cold. b, Violin plots showing the expression levels and distribution of representative upregulated transcripts for the selected GO terms. c, Gene ontology (GO) enrichment analysis of the transcripts significantly downregulated in vascular smooth muscles by cold. d, Violin plots showing the expression levels and distribution of representative downregulated transcripts for the selected GO terms. e, Adipogenesis and Fatty acid metabolism gene signatures visualized on UMAP plots using VISION. (f) Pathway enrichment analysis of the top 100 genes driving the trajectory.
Extended Data Fig. 4 Trpv1 expression is restricted to adipose tissue vasculature, related to Fig. 2.
Immunohistochemistry for Trpv1 in adipose tissue from mice housed at RT or cold for 7 days. Scale bars=10 μm. N = 4 biologically independent animals examined in 1 experiment.
Extended Data Fig. 5 Flow cytometry analysis of adipose tissue SVF, related to Fig. 2.
Representative flow cytometry analysis of BAT-SVF derived from Trpv1cre Rosa26mTmG mice. a, Gating strategy for isolating single SVF cells from BAT-SVF based on side scatter (SSC) and forward scatter (FSC). b, Unstained, single channel and isotype control gates for GFP and Pdgfrα. c-f, Unstained and single channel control gates for GFP and Sca-1 (c), Pdgfrβ (d), CD81 (e) and αSMA (f) antibodies.
Extended Data Fig. 6 TRPV1 and PDGFRA expression in human adipose progenitor cells, related to Fig. 2.
a, Unsupervised clustering of adipocytes and adipocyte progenitors in the single nuclei RNA-sequencing of human deep neck adipose tissue with 5 separate clusters indicated in each color. b, TRPV1 and (c) PDGFRA expression visualized on UMAP plots. d, Violin plots showing the expression levels and distribution of TRPV1, PDGFRA, and adiponectin (ADIPOQ) expression in each cluster identified in panel a.
Extended Data Fig. 7 Cold recruits adipocytes from the Trpv1pos lineage in BAT, related to Fig. 4.
a, Violin plot showing the Trpv1 expression in BAT-SVF at different housing conditions. b, Percentage of cells in brown adipocyte cluster at different housing conditions in the scRNA-seq experiment. N = 4 per group. Data are presented as Means ± SEM. One-Way ANOVA with Dunnett’s multiple comparisons test. c, EdU detection followed by immunohistochemistry staining for Plin1 and GFP in BAT from mice raised from birth to 6 weeks of age in thermoneutrality and transferred to room temperature (1 week) and cold (1 week). EdU was administered for 1 week at cold. Scale bar=50 μm. N = 6 biologically independent animals examined in one experiment.
Extended Data Fig. 8 Cold increases the number of GFPpos adipocytes in ingWAT, related to Fig. 4.
a, Left: Immunohistochemistry staining for GFP and Plin1 in ingWAT from mice housed at room temperature or cold for 7 days. Right: Percentage of GFPpos adipocytes (Plinpos) in ingWAT of Trpv1cre Rosa26mTmG mice housed at RT or cold (5 °C) for 7 days. N = 5 mice per group, 4–11 images/mouse. Data are presented as Means ± SEM. Two-Way ANOVA with Sidak’s multiple comparisons test. b, Top: Immunohistochemistry staining for GFP and Plin1 in pgWAT from mice housed at room temperature or cold for 7 days. Bottom: Percentage of GFPpos adipocytes (Plinpos) in pgWAT of Trpv1cre Rosa26mTmG mice housed at RT or cold (5 °C) for 7 days. N = 5 mice per group, 4–6 images/mouse. Data are presented as Means ± SEM. Scale bar=50 μm.
Extended Data Fig. 9 Cold recruits GFPpos beige adipocytes in WAT, related to Fig. 4.
a, Schematic presentation of housing conditions utilized in this study. To measure the contribution of the Trpv1 lineage to newly recruited beige adipocytes, Trpv1cre Rosa26mTmG mice were raised from birth in thermoneutrality to minimize beige adipogenesis, after which a cohort of animals was first moved to room temperature for one week followed by one week of cold exposure (TN → Cold). The control group was kept at TN the whole time (TN → TN). b, Left: Immunohistochemistry staining for UCP1 and GFP in ingWAT. Right: Percentage of UCP1neg (unilocular) and UCP1pos (multilocular) GFPpos adipocytes in each group. N = 5 mice per group, 6–11 images/mouse. Data are presented as Means ± SEM. Scale bar=50 μm. c, EdU detection followed by immunohistochemistry staining for Plin1 and GFP in ingWAT from mice housed in the TN → Cold condition. EdU was administered for 1 week at cold. Scale bar=100 μm. N = 2 biologically independent animals examined in one experiment. d, Left: Immunohistochemistry staining for Plin1 and GFP in pgWAT. Right: Percentage of GFPpos adipocytes in each group. N = 5 mice per group, 4–5 images/mouse. Data are presented as Means ± SEM. Scale bar=100 μm.
Extended Data Fig. 10 Brown adipocytes derived from the Trpv1pos progenitors are highly thermogenic, related to Fig. 4.
a-d, Expression of the indicated transcripts in tdTomatopos and GFPpos adipocytes isolated from BAT and ingWAT of Trpv1cre Rosa26mTmGmice housed at cold for 7 days. N = 6 mice per group. Data are presented as Means ± SEM. Two-Way ANOVA with Sidak’s multiple comparisons test.
Supplementary information
Supplementary Information
Supplementary Fig. 1
Supplementary Tables 1 and 2
Supplementary Table 1. qPCR primer sequences. Supplementary Table 2. List of the antibodies.
Supplementary Data 1
Marker genes for clusters of cells in BAT-SVF identified using Seurat. As a default, Seurat performs differential expression based on the non-parametric Wilcoxon rank sum test.
Supplementary Data 2
List of differentially expressed transcripts in Pdgfrα+ APCs (AP_8 and AP_9), capillary endothelial cells (EC_4), VSMs (all VSM clusters) and Schwann cells (Schwann cells_14) identified using the likelihood-ratio test.
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Shamsi, F., Piper, M., Ho, LL. et al. Vascular smooth muscle-derived Trpv1+ progenitors are a source of cold-induced thermogenic adipocytes. Nat Metab 3, 485–495 (2021). https://doi.org/10.1038/s42255-021-00373-z
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DOI: https://doi.org/10.1038/s42255-021-00373-z
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