Abstract
Insulin resistance is a cardinal feature of Type 2 diabetes (T2D) and a frequent complication of multiple clinical conditions, including obesity, ageing and steroid use, among others. How such a panoply of insults can result in a common phenotype is incompletely understood. Furthermore, very little is known about the transcriptional and epigenetic basis of this disorder, despite evidence that such pathways are likely to play a fundamental role. Here, we compare cell autonomous models of insulin resistance induced by the cytokine tumour necrosis factor-α or by the steroid dexamethasone to construct detailed transcriptional and epigenomic maps associated with cellular insulin resistance. These data predict that the glucocorticoid receptor and vitamin D receptor are common mediators of insulin resistance, which we validate using gain- and loss-of-function studies. These studies define a common transcriptional and epigenomic signature in cellular insulin resistance enabling the identification of pathogenic mechanisms.
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Acknowledgements
We would like to thank M. Herman (Beth Israel Deaconess Medical Center, USA) for providing adipose RNA from obese mice. We thank members of the Rosen laboratory for helpful discussions, and E. Merkel for technical assistance. The V729I and D641V GR mutant alleles were from G. Chrousos (Athens University Medical School, Greece), and the N768 allele was a gift from K. Yamamoto (University of California, San Francisco, USA). J-C. Wang (University of California, Berkeley, USA) provided the anti-GR antibody used for ChIP-PCR and ChIP-Seq, and he and I. Rogatsky were generous with their time and advice. This work was supported by NIH Roadmap grant R01 ES017690, R01085171 and an American Diabetes Association Career Development Award to E.D.R., NIH Innovator grant DP2OD007447 to B.A.G., and by American Heart Association Postdoctoral Awards to S.K. and L.T.T.
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S.K., L.T.T. and E.D.R. designed the study. Experimental work was carried out by S.K., with help from M.J.G. and S.X.; ChIP-Seq was performed by S.K. and L.T.T. with assistance from R.I., H.J.W. and C.B.E. Computational data analysis was performed by L.T.T., Y.Z. and T.S.M. A.E. and B.A.G. performed histone mass spectrometry. S.K., L.T.T. and E.D.R. wrote the manuscript.
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Integrated supplementary information
Supplementary Figure 1 The Dex and TNF model system.
(a) Cartoon depicting the Dex-TNF system. 3T3-L1 adipocytes are differentiated fully for 8 days, and then treated with Dex or TNF for a variable amount of time (6 days maximum) before glucose uptake assay or harvest for RNA or ChIP. Of note, drug treatments were staggered so that cells were always harvested 14 days after confluence was reached, thus ensuring that results do not reflect different duration of culture. (b) Oil red O staining of cells treated with Dex or TNF for 6 days. (c) Expression of differentiation markers in cells treated with Dex or TNF for 6 days (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (d) Heat map of correlation coefficients observed after comparing transcriptional profiles from Dex- and TNF-treated cells to those obtained at different stages of adipogenesis (from14). (e) Western blot of PPARγ levels in cells from c. (f) quantification of e (data show the result from one experiment). (g) Heat map of treatment-sensitive gene expression changes from Dex- and TNF-treated cells. The colour bar at right denotes 9 distinct clusters representing different patterns of expression in response to Dex and TNF. (h) Venn diagram depicting the number of down-regulated genes in response to Dex and TNF treatment. These numbers represent a ‘unity’ set in which all time points were combined.
Supplementary Figure 2 Comparison of transcriptional events due to Dex and TNF versus diet-induced obesity.
(a–c) Genes concordantly up-regulated (red) and down-regulated (green) by Dex, TNF, or both (overlapping) are mapped onto a plot of genes altered in two murine models of obesity, high-fat fed C57Bl/6 and BTBR mice (grey). Obesity data are from22. X and Y axes reflect log2 fold change (HFD versus Chow). (d) Box-and-whiskers plot of data from a–c, comparing genes up- and down-regulated by Dex, TNF, or both to obese C57Bl/6 mice (n = number of genes in each group (invariant = 160, DexUP = 357, TNF_UP = 512, Overlap_UP = 110, Dex_Down = 358, TNF_Down = 339, Overlap_ DOWN = 120), whiskers represent 1 SD, box edges are 1st and 3rd quartiles, Student’s t-test, p < 0.05). (e) Box-and-whiskers plot of data from a–c, comparing genes up- and down-regulated by Dex, TNF, or both to obese BTBR mice (n values as in d, Student’s t-test, p < 0.05). (f) Fold change (log2 scale) of induced or repressed concordantly by Dex and TNF in the white adipose tissue of two strains of obese versus lean mice (n values as in d, p < 0.05 by Student’s t-test, mean ± SD). (g) Heat map of correlation coefficients comparing gene expression changes from specific Dex and TNF time points to the C57Bl/6 and BTBR obesity models.
Supplementary Figure 3 Epigenomic analysis of cellular insulin resistance
(a) Trypsinized histone fragments from Dex- and TNF-treated cells were subjected to mass spectrometry. Depicted is a heat map displaying changes in histone 3 marks (n = 2). (b) ChIP-Seq was performed using antibodies directed against the indicated histone modifications at different time points after Dex and TNF treatment. Shown are the total number of called peaks for each modification and time point. (c) Heat maps for model parameters from ChromHMM model learned from x-axis labelled ChIP-seq data sets across control and all Dex and TNF time points. The columns indicate the relative percentage of the genome represented by each chromatin state. WCE = whole-cell extract. (d) Heat maps for enrichment of each state for various annotated functional genomic elements e. Heat maps for enrichment of each state as a function of distance from TSS. (f) Numbers of promoters and enhancers during adipocyte differentiation (compared to Day 7 adipocytes), or at each time point after Dex and TNF treatment (compared to untreated) are indicated. The percentages of nonoverlapping promoters or enhancers that change with differentiation or drug treatment are shown at right.
Supplementary Figure 4 Genes coordinately up-regulated by Dex and TNF lie near up-regulated H3K27ac peaks.
(a) Venn diagram depicting genes induced by Dex and TNF. Of the 271 genes coordinately induced by both agents, 147 were flanked by at least one up-regulated H3K27ac peak within ±200 kb of the TSS. These 147 genes could be classified as associated with a ‘Dex-only’ peak (n = 22), a ‘TNF-only peak’ (n = 80), or both a Dex and a TNF-induced peak (n = 147). This last group could be further subcategorized into ‘Dex-TNF nonoverlapping’ peaks (n = 99) and ‘Dex-TNF overlapping’ peaks (n = 48). (b) Tracks from an up-regulated gene (Cebpd) showing a ‘Dex-only’ H3K27ac peak. (c) Tracks from an up-regulated gene (Igfbp3) showing a ‘TNF-only’ H3K27ac peak. (d) Tracks from an up-regulated gene (Ifngr1) showing a ‘Dex-TNF-nonoverlapping’ H3K27ac peak. (e) Tracks from an up-regulated gene (Fam46b) showing a ‘Dex-TNF-overlapping’ H3K27ac peak.
Supplementary Figure 5 TNF induces insulin resistance in part via ligand-independent activation of the GR.
(a) Expression of Nr3c1 (GR) in cells 6 days after transduction with lentiviruses carrying shRNAs directed against GR or a scrambled control (shScr) (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (b) Expression of Rela (p65) in cells 6 days after transduction with lentiviruses carrying shRNAs directed against p65 or a scrambled control (shScr) (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (c) Several shRNAs against p65 (vs. scrambled shRNA: shScr) were delivered to mature adipocytes via lentivirus, and cells were then treated with Dex or TNF and assessed for insulin-stimulated glucose uptake. Shown is the percent of insulin-stimulated glucose uptake rescued by p65 knockdown (data represent mean of n = 6 dishes, data from 2 additional independent experiments shown in Source Data Table); ND = not determined because of cell death). (d) Expression of Hsd11b1 was assessed in mature 3T3-L1 adipocytes by Q-PCR after treatment with Dex and TNF for the indicated period of time (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (e) Carbenoxolone at the indicated dose was treated to fully differentiated adipocytes with or without Dex or TNF for 6 days and then assessed for insulin-stimulated glucose uptake (data represent mean of n = 6 dishes, data from 1 additional independent experiment shown in Source Data Table). (f) The effect of carbenoxolone (70 μM) was tested on glucocorticoid-dependent gene expression in mature 3T3-L1 adipocytes. Cortisol or cortisone (1 uM each) were used to induce expression of known targets Sgk1 and Dusp1; carbenoxolone blocks the effect of cortisone, which must be activated by 11-β-HSD1, but not cortisol, which does not require activation, (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table).
Supplementary Figure 6 TNF and Dex induce binding of GR to specific loci.
(a) Genomic distribution of significantly enriched GR peaks. (b) Mean mammalian conservation scores of GR peak subsets centered around GR peak centers. The gray dotted line represents mean conservation score across entire genome. (c) Heat map showing SQRT –log2 (p-value) comparing the fold change in expression for the nearest gene from peak sets at the indicated condition/time point to a random set of H3K27ac peaks (fold changes are provided in Fig. 5c). Non-significant p-values after multiple testing hypothesis correction are labeled N.S.
Supplementary Figure 7 VDR binds to ‘Dex-TNF-overlapping’ H3K27ac peaks.
(a) Tracks from an up-regulated gene (Lcn2) showing a ‘Dex-TNF-overlapping’ H3K27ac peak. (b) ChIP-PCR results from the ‘Dex-TNF-overlapping’ peak depicted in a (data represent mean of n = 3 dishes, data from 2 additional independent experiments shown in Source Data Table). (c) Tracks from an up-regulated gene cluster (Tmem176a/b) showing a ‘Dex-TNF-overlapping’ H3K27ac peak. (d) ChIP-PCR results from the ‘Dex-TNF-overlapping’ peak depicted in c (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (e) ChIP-PCR of VDR and GR from a nonspecific region near Lcn2 (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (f) ChIP-PCR of VDR and GR from a nonspecific region near Tmem176a/b (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (g) RXR ChIP-PCR results in 3T3-L1 adipocytes from the ‘Dex-TNF-overlapping’ peaks containing VDR motifs depicted in Figs. S5g, S10a, and S10c near Colq, Tmem176a, and Lcn2 loci (data represent mean of n = 3 dishes, data from 2 additional independent experiments shown in Source Data Table), using anti-RXR or IgG. (h) Expression of flag-tagged VDR in cells 4 days after transduction with lentivirus. (i) Expression of Vdr in cells 6 days after transduction with lentiviruses carrying shRNAs directed against VDR or a scrambled control (shScr) (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (j) Fully differentiated adipocytes were pre-treated with vehicle, NAC (1 mM) or MnTABP (100 nM) for 2 days and then treated with Dex or TNF for an additional 6 days and assessed for insulin-stimulated glucose uptake (data represent mean of n = 6 dishes, data from 1 additional independent experiment shown in Source Data Table). (k) After overexpressing VDR or control vector, cells were treated with NAC (1 mM), MnTBAP (100 nM), or vehicle and assessed for insulin-stimulated glucose uptake (data represent mean of n = 6 dishes, data from 1 additional independent experiment shown in Source Data Table). (l) Vdr mRNA levels were measured in samples collected from the experiment in j (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table).
Supplementary Figure 8 Assessment of GR and VDR target genes.
(a) Q-PCR validation of coordinately up-regulated genes. Cells were treated with Dex (blue) or TNF (red) for the indicated lengths of time before RNA harvest (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (b) Expression of up-regulated target genes in cells transduced with lentivirus carrying shRNA directed against VDR or GR (vs. scrambled control: shScr) and then treated with Dex (D) or TNF (T) for 6 days (data represent mean of n = 3 dishes, data from 1 additional independent experiment shown in Source Data Table). (c) Expression of coordinately up-regulated genes was measured in white adipose tissue samples from chow and high fat-fed C57Bl/6 mice (n = 6 mice P < 0.05, Student’s t-test, mean ± SEM). (d) Expression of coordinately up-regulated genes was measured in white adipose tissue samples from ob/+ and ob/ob mice, treated with vehicle or rosiglitazone for 6 weeks (n = 7 for ob/+, n = 8 for ob/+ plus Rosi, n = 7 for ob/ob with and without Rosi, P < 0.05, Student’s t-test, mean ± SEM).
Supplementary Figure 9 Uncropped blots used in this manuscript.
(a–c) Scanned images for GR fractionation assays shown in main Fig. 3g (a: Flag-GR, b: TBP, and c: GAPDH). (d,e) Scanned images for total GR protein from whole cell lysates shown in main Fig. 3g (c: Flag-GR, d: GAPDH). (f,g) Scanned images for PPARγ levels during the time course of Dex and TNF treatment in Supplementary Fig. 1e (f: PPARγ, g: Histone3), (h,i) Scanned images for the measurement of VDR overexpression in Supplementary Fig. 7h (h: Flag-VDR, i: GAPDH).
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Kang, S., Tsai, L., Zhou, Y. et al. Identification of nuclear hormone receptor pathways causing insulin resistance by transcriptional and epigenomic analysis. Nat Cell Biol 17, 44–56 (2015). https://doi.org/10.1038/ncb3080
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DOI: https://doi.org/10.1038/ncb3080
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