Abstract
Birth presents a metabolic challenge to cardiomyocytes as they reshape fuel preference from glucose to fatty acids for postnatal energy production1,2. This adaptation is triggered in part by post-partum environmental changes3, but the molecules orchestrating cardiomyocyte maturation remain unknown. Here we show that this transition is coordinated by maternally supplied γ-linolenic acid (GLA), an 18:3 omega-6 fatty acid enriched in the maternal milk. GLA binds and activates retinoid X receptors4 (RXRs), ligand-regulated transcription factors that are expressed in cardiomyocytes from embryonic stages. Multifaceted genome-wide analysis revealed that the lack of RXR in embryonic cardiomyocytes caused an aberrant chromatin landscape that prevented the induction of an RXR-dependent gene expression signature controlling mitochondrial fatty acid homeostasis. The ensuing defective metabolic transition featured blunted mitochondrial lipid-derived energy production and enhanced glucose consumption, leading to perinatal cardiac dysfunction and death. Finally, GLA supplementation induced RXR-dependent expression of the mitochondrial fatty acid homeostasis signature in cardiomyocytes, both in vitro and in vivo. Thus, our study identifies the GLA–RXR axis as a key transcriptional regulatory mechanism underlying the maternal control of perinatal cardiac metabolism.
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Data availability
Data generated from RNA-seq, ATAC–seq and ChIP–seq have been deposited in the Gene Expression Omnibus with the accession number GSE188991. Source data for main and extended data figures are available online as separate Excel files for each figure. Lipidomics raw data from cardiac tissue (Fig. 2d) and milk (Fig. 4h) can be found in Supplementary Table 1 and Supplementary Table 2, respectively. Source data are provided with this paper.
Change history
15 June 2023
A Correction to this paper has been published: https://doi.org/10.1038/s41586-023-06316-w
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Acknowledgements
The authors thank the members of the M.R. and J.A.E laboratories, A. Hidalgo and M. Torres for extensive discussions of the paper; G. Sabio, N. Rochel and D. Metzger for mice and reagents; CNIC and CRG Genomics Units for sequencing; S. Bartlett for editorial assistance; and A.V. Alonso, L. Flores, R. Baeza, R. Santos-Clemente, C. Gifford and N. Spann for technical assistance. J.P.B. is funded by the NextGenerationEU/PRTR and Agencia Estatal de Investigación (10.13039/501100011033; PID2019-105699RB-I00; PDC2021-121013-I00, RED2018-102576-T), Instituto de Salud Carlos III (CB16/10/00282), and Junta de Castilla y León (Apoyo Regional a la Competitividad Empresarial, ICE 04/18/LE/0017 and Escalera de Excelencia CLU-2017-03). D.J.-B. And P.H.A. are recipients of a Juan de la Cierva-Incorporación contracts (IJC2020-044230-I and IJC2020-042679-I, respectively). F.J.R. is funded by the Ministerio de Ciencia e Innovación (MCIN) and European Regional Development Fund FEDER (PID2021-122490NB-I00). V.A.R.S. received funding from Airbus Defense and Space through the CLX-2 programme in partnership with Comando da Aeronautica (COMAER) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES). E.T. received funding from the Swedish Research Council (2020-01150), the Swedish Cancer Society (211582), and the Novo Nordisk Foundation (NNF20OC0063672). J.A.E. was supported by RTI2018-099357-B-I00, MCIU/AEI/ ERDF/UE; RTI2018-099357-B-I00 MCIU/AEI; PID2021-1279880B-100 MCIN/AEI/10.13039/501100011033/ERDF,UE; CB16/10/00282 CIBERFES and 17CVD04 Foundation Leducq. This work was supported by grants to M.R.: SAF2017-90604-REDT-NurCaMeIn MINECO/AEI; RTI2018-095928-BI00, MCIU/AEI/ ERDF/UE; PID2021-122552OB-I00 MCIN/AEI/10.13039/501100011033/ERDF,UE; 201605-32 Fundació La Marató de TV3; and S2017/BMD-3684 Comunidad de Madrid/ESF/EU, S2022/BMD-7227 Comunidad de Madrid; and an MINECO fellowship to A.P. (BES-2016-076632/AEI/ESF) and to R.J.-M. (PRE2019-087462). The CNIC is supported by the Instituto de Salud Carlos III (ISCIII), the Ministerio de Ciencia e Innovación (MCIN), and the Pro CNIC Foundation, and is a Severo Ochoa Center of Excellence (grant CEX2020-001041-S funded by MICIN/ AEI/ 10.13039/501100011033).
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Conceptualization: A.P. and M.R. Performed research: A.P., R.J.-M., D.J.-B., V.N., I.C., M.V.-O., A.A., T.F., A.G., V.A.R.S., Z.H., P.H.-A., C.C. and E.C. Software: F.W., F.M. and F.S.-C. Data interpretation and analysis: A.P., R.J.-M, M.V.-O., J.V., J.R.-C., E.A.-G., E.T., J.P.B., E.E.-P., F.J.R., C.B., J.A.E. and M.R. Writing, reviewing and manuscript editing: A.P., J.A.E. and M.R. Project supervision: A.P., J.A.E. and M.R. Funding: M.R.
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Extended data figures and tables
Extended Data Fig. 1 Functional features of EDKO mice after birth.
(a) RXRs gene expression (E12.5 (n = 5), E14.5 (n = 4), E18.5 (n = 5), P1 (n = 4), P15 (n = 4) and P21 (n = 3)) in C57Bl6/J hearts. Data as means±s.e.m. (b) Rxra and Rxrb cardiac expression in EDKO (n = 3-6) and Control (n = 4-6) mice. Data as means±s.e.m. Two-way ANOVA. (c) Echocardiography parameters in EDKO (n = 9) and control (n = 11) mice (P0). Data as means±s.e.m. Two-tailed Student t test. (d) Left, Heart diameter (mm) and right, non-compacted (NC) and compacted (C) myocardial width in E18.5 EDKO (n = 9) and control (n = 8) mice. Data as means±s.e.m. Two-tailed Student t test. (e) Thickness (µm) of trabeculae (T) and compact myocardium (CM) in E18.5 EDKO (n = 9) and control (n = 8) mice. Data as means ± s.e.m. Paired Two-tailed Student t test. (f) Hematoxylin-eosin staining of EDKO and control hearts (E18.5). Scale bar = 500 µm. (g) Heart weight/body weight ratio (%HWBW) (control = 17, EDKO = 15), body weight (g) (control = 48, EDKO = 33), and heart weight (g) (control = 17, EDKO = 14). Data as means±s.e.m. Two-tailed Student t test. (h) Electrocardiography parameters in P0 EDKO (n = 10) and control (n = 5) mice. Data as means±s.e.m. Two-tailed Student t test. (i) Rxra and Rxrb expression in tissues from EDKO (n = 3-6) and control (n = 5-6) mice (P0). Data as means±s.e.m. Two-tailed Student t test. (j) Suckling score piecharts for 30 control and 15 EDKO mice. (k) Stress markers expression in control (n = 5) and EDKO (n = 6) lungs (P0). Data as means±s.e.m. Two-tailed Student t test. (l) Hematoxylin-eosin staining of EDKO and control lungs (P0). Scale bar = 500 µm. (m) Wet/Dry lung ratio from control (n = 16) and EDKO (n = 9) (P0) mice. Data as means±s.e.m. Two-tailed Student t test. (n) Mean, maximum, and minimum body temperature (ºC) in EDKO (n = 5) and control (n = 5) mice at P0. Data as means±s.e.m. Two-tailed Student t test. Exact P values in Source Data.
Extended Data Fig. 2 Cardiac mitochondrial morphology or quantity is not altered in EDKO hearts.
(a) Fatty acid-derived energy homeostasis pathway. (b) Heatmaps and hierarchical clustering of proteomics enrichment data (Zq value EDKO vs control hearts) for proteins involved in ROS metabolism, the degradome, mitochondrial dynamics, and the mitochondrial unfolded protein response (mtUPR). (c) TEM acquisition of cardiac mitochondria at P0 in control and EDKO hearts. (d) Left, Mitochondrial area normalized to the cell area in EDKO (n = 3) and control (n = 3) hearts (P0) (arbitrary units). Dots are technical replicates from 3 individual biological replicates/group. Right. Mitochondrial area in EDKO (n = 3) and control (n = 3) hearts (P0). Each dot is one mitochondrion (mean = 25-65 mitochondria/3 mice per condition). Data as means±s.e.m. Two-tailed Student t test. (e) Mitochondrial copy number (mtDNA/nDNA) in P0 EDKO (n = 8) and control (n = 12) hearts. Data as means±s.e.m. Two-tailed Student t test. (f) GC-MS volcano plot in EDKO and control hearts (P0). PAspartic acid = 0.00669, PUracil = 0.0249, PCreatinine = 0.02812, PGlycerol = 0.03959. Log2FC, log2 fold-change EDKO vs control. The dotted line indicates P value < 0.05. Dot size represents the variable importance parameter (VIP) value. Green and yellow dots represent downregulated and upregulated metabolites, respectively. (g) RT-qPCR quantification of Upp1 in cardiac tissue in EDKO (n = 3-6) and Control (n = 4-6) mice. Data as means±s.e.m. Two-way ANOVA. (h) Ex vivo rate of amino acid decarboxilation in P0 EDKO (n = 7) and control (n = 12) hearts, measured as [U-14C] amino acid conversion to 14CO2 (nmol x h−1 per mg tissue). Data as means ± s.e.m. Two-tailed Student t test. (i) a-ketoglutarate (α-KG) quantification (area corrected/signal quantification, arbitrary units) in EDKO (n = 4) and control (n = 4) P0 hearts. Data were presented as means±s.e.m. Two-tailed Student t test. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001. Exact P values in Source Data.
Extended Data Fig. 3 RXR drives chromatin openness and histone activation of mtFAH signature genes.
(a) MA plots representing the H3K27ac ChIP-seq data (left) and ATAC-seq data (right) of changes in chromatin activation and openness in EDKO perinatal hearts, respectively. x-axis denotes the log2mean expression for each peak and y-axis indicates Log2FC EDKO vs control for each peak. Significant (adjusted P value < 0.05, Log2FC = 0.6) active/open and inactive/closed annotated genes are colored in red and blue, respectively. Two-tailed Student t test (Benjamini-Hochberg correction per gene). Top 20 genes are highlighted in each case. (b) Annotation distribution of differentially open peaks (ATAC-seq) and differentially active loci (H3K27ac ChIP-seq) in EDKO P0 hearts. Total peaks are indicated as well as the percentage of each annotation. (c) Relative RT-qPCR quantification of mtFAH genes in cardiac tissue from control (n = 5) and PPARα-null (n = 5) P0 newborns. Independent biological replicates. Data were presented as means ± s.e.m. Two-tailed Student t test. (d) Volcano plot depicting the intersection between RNA-seq and H3K27ac ChIP-seq experiments in EDKO P0 hearts. Points are plot according Log2FC and –log10(adjusted P value) in RNA-seq experiment. Two-tailed Student t test (Benjamini-Hochberg correction per gene). Color and size are plot according Log2FC and –log10(adjusted P value) in H3K27ac ChIP-seq experiment, respectively. (e) HOMER motif enrichment analysis. Top-scoring motifs in RXR ChIP-seq peaks are shown, together with P values, best-match transcription factors, type of direct repeat sequence (DR) and % of target and background sequences. (f) Annotation distribution of RXR cistrome in P0 hearts. Total peaks are indicated as well as the percentage of each annotation. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001. Exact P values are provided in Source Data.
Extended Data Fig. 4 Fasting and milk-borne vitamin A effects on the mtFAH gene signature.
(a) RXR and mtFAH gene expression in C57Bl6/J hearts treated with vehicle (n = 5) or bexarotene (n = 5). Data as means ± s.e.m. Two-tailed Student t test (Benjamini-Hochberg). (b) Experimental outline for studying the contribution of milk suckling. (c) RXR expression from fed (black) or fasted (green) control (n = 5-12) and EDKO (n = 4-6) hearts. Data as means±s.e.m. Two-way ANOVA (Tukey’s) (d) mtFAH gene expression from fed or fasted control (n = 5-12) and EDKO (n = 4-6) hearts (P0). Data as mean ± s.e.m. Two-way ANOVA (Tukey’s). (e) RXR and mtFAH gene expression from control (n = 10-22) and EDKO (n = 6-12) newborns (P0) suckled with NCD or vitamin-A-deficient (VAD) milk. Data as means±s.e.m. Two-way ANOVA (Tukey’s). (f) Metabolic gene expression from NCD (n = 6) or FFD (n = 11) hearts (P0). Data as mean ± s.e.m. Two-tailed Student t test. (g) RXRs gene cardiac expression from control (n = 10-17) and EDKO (n = 12-13) NCD or FFD pups. Data as means±s.e.m. Two-way ANOVA (Tukey). (h) Body weight (g) of NCD (n = 12) or FFD (n = 16) newborns (P1). Data as means±s.e.m. Two-tailed Student t test. (i) Echocardiography parameters in NCD (n = 4) and FFD (n = 6) newborns. Fractional area change (FAC, %). Data as means±s.e.m. Two-tailed Student t test. (j) Body temperature (ºC) in FFD (n = 9) and NCD (n = 5) mice (P0). Data as means±s.e.m. Two-tailed Student t test. (k) Wet/Dry lung ratio from NCD (n = 19) and FFD (n = 7) (P0) mice. Data as means±s.e.m. Two-tailed Student t test (n = 7-19 mice/condition). (l) Corrected abundance of total free FAs in NCD (n = 6) or FFD (n = 4) milk. SAFA, saturated FAs. MUFA, monounsaturated FAs. DUFA, di-unsaturated FAs. PUFA, polyunsaturated FAs. Data as means±s.e.m. Two-tailed Student t test. (m) Relative abundance of predominant SAFAs and MUFAs in NCD (n = 6) and FFD (n = 4) milk. Data as means±s.e.m. Two-tailed Student t test. Exact P values in Source Data.
Extended Data Fig. 5 GLA-RXR activates the expression of mtFAH gene signature.
(a) ω-6 fatty acids in vitro stimulation approach. (b-c) mtFAH gene expression (% of control) resulting from GLA-BSA (n = 4), LA-BSA (n = 4), and LG268 (n = 4-6) stimulation in primary neonatal cardiomyocytes (nCM) (b) or HL1 cell line (c). Data as means±s.e.m. Two-tailed Student t-test (ligand vs baseline, Benjamini-Hochberg). Representative experiment (n = 3). (d) Dose-response curves of GLA-BSA stimulation in nCM (n = 3 technical replicates). Representative experiment (n = 3). Data as means±s.e.m. Non-linear regression. (e) mtFAH gene signature expression in nCM with GLA-BSA (n = 10) and GLA-BSA +UVI3003 (n = 9). GLA as a %Control, and GLA+UVI as a %Control+UVI. Data as means±s.e.m. Two-way ANOVA (Tukey&Benjamini-Hochberg). (f) Blood glucose in NCD (n = 21), FFD (n = 56) or GLA+fat-free-diet (GLA, n = 55) newborns (P0). Data as means±s.e.m. Kruskal-Wallis test (Dunn’s). (g) Body weight of NCD (n = 34), FFD (n = 17) or GLA (n = 17) newborns. Data as means±s.e.m. One-way ANOVA (Tukey). (h) Suckling score piecharts (%) for 33 NCD, 29 FFD, 18 GLA neonates. (i) Cardiac mtFAH gene signature expression from NCD (n = 6), FFD (n = 8) or GLA (n = 21) newborns. Data as means±s.e.m. One-way ANOVA (Tukey&Benjamini-Hochberg). (j) Kaplan-Meier curve of FFD (n = 64), GLA+LA+fat-free diet milk (n = 33), GLA+fat-free-diet milk (n = 24) mice. Log-Rank test. (P < 0.00001). (k) (AOX)3-TK-driven luciferase reporter assay in HEK293.T cells. Cells transfected with: empty vector, wild-type RXRα(LBD) (n = 3) or mutated RXRα(LBD)-ΔAF2 (n = 3) and stimulated with GLA-BSA. Data as means±s.e.m. Two-way ANOVA (Tukey’s). Representative experiment (n = 3). (l) (AOX)3-TK-driven luciferase reporter assay to assess SRC1 coactivator recruitment (HEK293.T cells). Cells transfected with wild-type RXRα(LBD) (n = 3) and/or SRC1 coactivator (n = 3), and treated with GLA-BSA. Data as means±s.e.m. Two-way ANOVA (Tukey). Representative experiment (n = 3). (m) Dose-response curves of GLA-BSA in (AOX)3-TK-driven luciferase assay. HEK293.T cells were transfected with wild-type RXRα(LBD) (n = 3). Representative experiment (n = 3). Data as means±s.e.m. Non-linear regression. Exact P values in Source Data.
Supplementary information
Supplementary File 1
This file includes descriptive statistics and diagnostic plots for ‘omics data. Related to Figs. 1d–f and 3.
Supplementary Table 1
Heart lipidome EDKO versus control newborn hearts
Supplementary Table 2
Milk lipidome FFD versus NCD milk
Supplementary Table 3
In silico docking parameters
Supplementary Table 4
Primer sequences
Supplementary Video 1
Parasternal 2D long-axis echocardiography view of P0 Control newborn
Supplementary Video 2
Parasternal 2D long-axis echocardiography view of P0 EDKO pre-mortem newborn
Supplementary Video 3
Parasternal 2D long-axis echocardiography view of P1 newborns suckled with regular (NCD) milk
Supplementary Video 4
Parasternal 2D long-axis echocardiography view of P1 pre-mortem newborn suckled with milk from dams on a FFD.
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Paredes, A., Justo-Méndez, R., Jiménez-Blasco, D. et al. γ-Linolenic acid in maternal milk drives cardiac metabolic maturation. Nature 618, 365–373 (2023). https://doi.org/10.1038/s41586-023-06068-7
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DOI: https://doi.org/10.1038/s41586-023-06068-7
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