Abstract
Neurological complications frequently impact morbidity, mortality and quality of life in patients with cardiovascular disease, yet the biological mediators connecting cardiovascular and neurological disease are poorly understood. Here we leverage data from 53,014 individuals with plasma proteomic profiles and 50,228 with cardiac and brain magnetic resonance imaging from the UK Biobank to identify circulating proteins correlated with imaging-derived phenotypes (IDPs); 404 and 76 proteins were associated with cardiac or brain IDPs, and 37 with both. Expression analyses suggested these proteins largely originate from fibroblasts, smooth muscle cells, and macrophages in the arterial vasculature. Pathway analyses highlighted cytokine and vasculature-related processes for cardiac IDPs-associated proteins and extracellular matrix pathways in brain IDPs-associated proteins. Mendelian randomization and genetic colocalization supported causal roles for over 63% of these proteins in disease pathogenesis. Over 90% of the proposed candidates have not previously been established as clinical biomarkers or therapeutic targets and represent a catalog for further research.
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Data availability
UKB data (demographics, imaging, proteomics) are accessible via application to the UKB (https://www.ukbiobank.ac.uk/). Raw MRI data and derived IDPs are also released to approved researchers. pQTL summary statistics can be assessed from the UKB-PPP study (https://metabolomips.org/ukbbpgwas/), the deCODE Health study (https://www.decode.com/summarydata/) and the Fenland study (https://www.omicscience.org/apps/pgwas). scRNA-seq data are available in the Gene Expression Omnibus under accession numbers GSE155468 and GSE253903. Disease and BMR GWAS summary statistics were obtained from OpenGWAS (https://opengwas.io/datasets/); the outcome identifiers are provided in Supplementary Tables 9 and 20. We developed an interactive web atlas for public access to our findings at https://proteomics-hbi.vercel.app.
Code availability
All data analyses and visualizations were implemented in R (v4.4.0) and Python (v3.12.0). Analyses relied on open-source software packages, including tidyverse (v2.0.0), dplyr (v1.1.4), biomaRt (v2.66.0), data.table (v1.17.8), TwoSampleMR (v0.6.30), ieugwasr (v1.1.0), PLINK (v1.9), survival (v3.8-3), coloc (v5.2.3), clusterProfiler (v4.18.3), futile.logger (v1.4.3), Seurat (v5), UpSetR (v1.4.0), pheatmap (v1.0.13), VennDiagram (v1.7.3), forestplot (v3.1.7), networkD3 (v0.4.1), circlize (v0.4.17), locuszoomr (v0.3.8), ensembldb (v2.34.0), EnsDb.Hsapiens.v75 (v2.99.0) and ggplot2 (v4.0.1) in R and pandas (v2.2.3), numpy (v2.1.3), scipy (v1.14.1), statsmodels (v0.14.5), omnipath (v1.0.12), Lifelines (v0.30.0), scikit-learn (v1.7.1) and matplotlib (v3.9.2) in Python. Custom scripts were developed for data processing, statistical analysis and figure generation. The scripts used to generate the results reported in this study are publicly available via Github at https://github.com/drchaowu/heart-brain-proteomics and via Zenodo at https://doi.org/10.5281/zenodo.18612353 (ref. 69).
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Acknowledgements
This study used data from the UKB resource under application numbers 197947 and 88365. We sincerely thank the participants and staff of the UKB for their invaluable contributions. We also gratefully acknowledge the participants and investigators of the FinnGen study. This work was supported by grants from the US National Institutes of Health (R01 AG061034 and R35 HL155318 to A.R., K08 HL177169 to S.A.K.), the Burroughs Wellcome Fund (fund ID 1416136 to S.A.K.) and the American Heart Association (AHA) (23MERIT1038415 and 24SFRNPCN1284382 (URLs: 10.58275/ AHA.24SFRNPCN1284382.pc.gr.194135 and 10.58275/ AHA.24SFRNCCN1276092.pc.gr.194131) to A.R.).
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A.R. conceived the study, supervised the research and revised the manuscript. C.W. designed the study, collected the data, performed the analyses and drafted the manuscript. D.L. contributed to data analysis, project discussions and manuscript revisions. M.W. provided feedback on the study design and statistical methodology and revised the manuscript. H.L. provided access to datasets and offered guidance on statistical methods. C.L. performed ligand–receptor interaction mapping. Z.Y. and J.H. performed scRNA-seq and cell-type-specific analyses. J.R.B.G. supported pathway and biological process analyses. S.H. developed the interactive web portal for data visualization. Q.Z. and M.Q. assisted with manuscript editing and figure preparation. S.A.K. performed the animal experiments and revised the manuscript.
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A.R. is a scientific founder of Thryv Therapeutics, unrelated to this current work. The other authors declare no competing interests.
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Extended data
Extended Data Fig. 1 Univariate correlation between CMR and BMR traits.
a. Manhattan plot of two-sided Pearson correlations between 82 CMR and 2,222 BMR traits. The x-axis shows BMR trait categories, and the y-axis shows -log10(P) value and correlation coefficients. The red line denotes the Bonferroni-corrected threshold (P < 2.74×10−7). Gray points represent negative correlations. b. Significant correlations between CMR and BMR trait categories after Bonferroni correction. c. Counts of significant CMR-BMR correlations. WM, white matter; swMRI, susceptibility-weighted MRI; DTI, diffusion tensor imaging; NODDI, neurite orientation dispersion and density imaging; dMRI, diffusion-weighted MRI; rfMRI, resting-state functional MRI; LV, left ventricle; LA, left atrium; RV, right ventricle; RA, right atrium; Asc aorta, ascending aorta; Des aorta, descending aorta; CMR, cardiac MRI; BMR, brain MRI.
Extended Data Fig. 2 Univariate associations between cognitive assessments and brain MRI IDPs.
Manhattan plot of two-sided Pearson correlation results between three cognitive assessment domains and 2,222 brain MRI imaging-derived phenotypes (BMR IDPs). The x-axis indicates BMR IDP categories and the y-axis shows −log10(P). The horizontal blue line indicates the Bonferroni-corrected significance threshold (P < 2.81×10⁻⁶); Black outlines denote associations that remain significant after false discovery rate (FDR) correction.
Extended Data Fig. 3 Mediation analysis of proteins on CMR-BMR trait interactions.
a–b. Diagram of mediation models with (a) and without (b) the mediator. The total effect (path c) is the impact of the independent MRI trait on the dependent MRI trait; the direct effect (c’) remains after adjusting for the mediator; and the indirect effect (path a × path b) is mediated through the protein. c–d. Plasma proteins that significantly mediate interactions from CMR to BMR traits (c) or from BMR to CMR traits (d). ISOVF, isotropic volume fraction; FA, fractional anisotropy; MD, mean diffusivity.
Extended Data Fig. 4 Tissue enrichment of all Olink proteins and proteins associated with both CMR and BMR trait.
a. Distribution of tissue-enrichment types for all 2,922 Olink proteins. b–c. Tissue enrichment of tissue-enriched and tissue-specific proteins across 32 GTEx tissues (b) and consolidated into 15 tissue groups (c). d–f. Tissue enrichment for proteins associated with both CMR and BMR traits. d. Distribution of tissue-enrichment types. e. Tissue enrichment across 32 GTEx tissues. f. Quantitative ligand-receptor connections; the x-axis represents ligands, and the y-axis represents receptors.
Extended Data Fig. 5 MRI-associated circulating protein tissue enrichment.
a–b. Tissue enrichment for tissue-enriched and tissue-specific proteins associated with CMR traits (a) and BMR traits (b) across 32 GTEx tissues. c–d. Quantitative ligand-receptor mapping for CMR (c) and BMR (d) trait-associated proteins. The x-axis shows receptors, and the y-axis shows ligands.
Extended Data Fig. 6 Cell-type markers in artery tissue.
a–b. Key cell-type biomarkers identified in single-cell RNA-sequencing data from carotid (a) and aorta (b) tissues, highlighting markers for fibroblasts (FBS), smooth muscle cells (SMCs), endothelial cells, and immune cells.
Extended Data Fig. 7 Cell-type specificity of candidate proteins in artery tissue.
a–b. Single-cell clustering of aorta (a) and carotid (b) tissues. c–d. Counts of cell-specific genes corresponding to artery-enriched, CMR trait-associated proteins (c) or BMR trait-associated proteins (d) in the aorta. e–f. Counts of cell-specific genes corresponding to artery-enriched, CMR trait-associated proteins (e) or BMR trait-associated proteins (f) in the carotid. SMC, smooth muscle cell.
Extended Data Fig. 8 Cell-type specificity of artery-enriched receptors.
a–b. Counts of cell-specific genes corresponding to artery-enriched receptors for CMR trait-associated (a) or BMR trait-associated (b) ligands in the aorta. c–d. Counts of cell-specific genes corresponding to artery-enriched receptors for CMR trait-associated (c) or BMR trait-associated (d) ligands in the carotid.
Extended Data Fig. 9 Associations between prevalent and incident disease and proteins associated with both CMR and BMR trait.
a. Proteins associated with incident and prevalent CVD and NeuD among proteins associated with both CMR and BMR trait. b. Overlap of proteins associated with incident/prevalent CVD and NeuD among proteins associated with both CMR and BMR trait. CVD, cardiovascular diseases; NeuD, neurological diseases.
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Wu, C., Li, D., Khetarpal, S.A. et al. Large-scale identification of protein biomarkers and therapeutic targets in heart and brain disease. Nat Cardiovasc Res (2026). https://doi.org/10.1038/s44161-026-00799-2
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DOI: https://doi.org/10.1038/s44161-026-00799-2