Human plasma proteomic profiles indicative of cardiorespiratory fitness

Jeremy M Robbins, Bennet Peterson, Daniela Schranner, Usman A Tahir, Theresa Rienmüller, Shuliang Deng, Michelle J Keyes, Daniel H Katz, Pierre M Jean Beltran, Jacob L Barber, Christian Baumgartner, Steven A Carr, Sujoy Ghosh, Changyu Shen, Lori L Jennings, Robert Ross, Mark A Sarzynski, Claude Bouchard, Robert E Gerszten, Jeremy M Robbins, Bennet Peterson, Daniela Schranner, Usman A Tahir, Theresa Rienmüller, Shuliang Deng, Michelle J Keyes, Daniel H Katz, Pierre M Jean Beltran, Jacob L Barber, Christian Baumgartner, Steven A Carr, Sujoy Ghosh, Changyu Shen, Lori L Jennings, Robert Ross, Mark A Sarzynski, Claude Bouchard, Robert E Gerszten

Abstract

Maximal oxygen uptake (VO2max) is a direct measure of human cardiorespiratory fitness and is associated with health. However, the molecular determinants of interindividual differences in baseline (intrinsic) VO2max, and of increases of VO2max in response to exercise training (ΔVO2max), are largely unknown. Here, we measure ~5,000 plasma proteins using an affinity-based platform in over 650 sedentary adults before and after a 20-week endurance-exercise intervention and identify 147 proteins and 102 proteins whose plasma levels are associated with baseline VO2max and ΔVO2max, respectively. Addition of a protein biomarker score derived from these proteins to a score based on clinical traits improves the prediction of an individual's ΔVO2max. We validate findings in a separate exercise cohort, further link 21 proteins to incident all-cause mortality in a community-based cohort and reproduce the specificity of ~75% of our key findings using antibody-based assays. Taken together, our data shed light on biological pathways relevant to cardiorespiratory fitness and highlight the potential additive value of protein biomarkers in identifying exercise responsiveness in humans.

Figures

Extended Data Fig. 1 |. Secreted proteins…
Extended Data Fig. 1 |. Secreted proteins positively related to bone homeostasis and baseline Vo2max.
Functional representation of proteins’ role in bone metabolism and homeostasis. Left and middle: SMOC1 regulates osteoblast differentiation. BMPs are related to bone formation via the TGF-β pathway and are mediated by extracellular signalling molecules such as NOG. Right: simplified schematic of proteins related to cartilage formation and their location within cartilage tissue.
Extended Data Fig. 2 |. Receiver-operating characteristic…
Extended Data Fig. 2 |. Receiver-operating characteristic curve for relative Vo2max changes with exercise training > 15% using overlapping targets between aptamer- and antibody-based proteomic platforms.
7/10 overlapping proteins on both platforms demonstrated moderate-strong correlation (SELE, TCL1A, COMP, CREG1, STC1, IL1RL2, LILRA2; ρ = 0.41–0.91) and were used in modeling.
Fig. 1 |. Proteins associated with baseline…
Fig. 1 |. Proteins associated with baseline Vo2max among offspring and parents.
Protein associations (FDR n = 433). We subsequently validated 50/94 proteins in the cohort of parents (n = 221; P < 0.05). Ninety of 94 proteins were directionally consistent, indicated by quadrant (increase in parents and offspring, upper right; decrease in parents and offspring, lower left).
Fig. 2 |. Plasma proteins associated with…
Fig. 2 |. Plasma proteins associated with baseline and ΔVo2max.
Protein relationships to baseline VO2max (ml O2 min−1) in a linear regression model adjusted for age, sex, BMI and race. The value of leptin’s relationship with baseline VO2max extends beyond the scale.
Fig. 3 |. Muscle proteins positively associated…
Fig. 3 |. Muscle proteins positively associated with baseline Vo2max.
Left, muscle filament depiction highlighting the proteins positively associated with baseline VO2max that participate in striated muscle structure and/or function. Myosin-binding protein slow-skeletal isoform (MYBPC1) regulates myosin–actin cross-bridge formation. Troponin I (TNNI2) inhibits actin-activated myosin ATPase activity. Gelsolin (GSN) is an actin severing protein. Myosin light-chain elements (MYL3 and MYL6B) regulate mechano-enzymatic function of myosin. Alpha-actinin 2 (ACTN2; not shown) and myomesin-2 (MYOM2) are actin and myosin stabilizing proteins. Right, table of names of proteins depicted at left and their associated gene symbols.
Fig. 4 |. GSEA for proteins associated…
Fig. 4 |. GSEA for proteins associated with ΔVo2max or baseline Vo2max.
Overview of overrepresented biological pathways and their connectivity using Cytoscape v3.7.1. a, Network visualization of GSEA results using the complete dataset of protein–ΔVO2max associations. Red dots indicate pathways with over-represented positive protein–ΔVO2max associations, and blue dots indicate over-represented negative protein–ΔVO2max associations. A larger circle size denotes a larger number of genes in a pathway, and darker shades indicate a higher degree of enrichment. Clusters indicate biological pathways with shared proteins and biological function. bd, Selected clusters of biological pathways with annotation, from a; the top contributing proteins to enrichment score are shown in a table. e, Network visualization of GSEA results using the complete dataset of protein–baseline VO2max associations.
Fig. 5 |. ROC curves for relative…
Fig. 5 |. ROC curves for relative Vo2max changes with exercise training > 15%.
a, The clinical trait score (age, sex, BMI and race) had a modest AUC. b, Addition of the protein score significantly improved the AUC. The sensitivity, specificity, positive predictive value, negative predictive value and accuracy at the optimal cutoff are included.
Fig. 6 |. Spearman’s correlations between aptamer-based…
Fig. 6 |. Spearman’s correlations between aptamer-based and antibody-based assays among top findings.
Spearman’s correlations between protein levels measured by an aptamer-based method (log (RFU); x axis) and antibody-based method (log (NPX); y axis).

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