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Identification of Circulating Plasma Proteins as a Mediator of Hypertension-Driven Cardiac Remodeling: A Mediation
Yuanlong Hu1, Lin Lin2, Lei Zhang3
1First Clinical Medical College (Y.H., M.Z., J. Huan, Yunlun Li), Shandong University of Traditional Chinese Medicine, Jinan, China.
Insights
This study identified specific plasma proteins that mediate hypertension's harmful effects on the heart. These findings advance our understanding of how high blood pressure leads to cardiac remodeling and heart failure.
Area of Science:
- Cardiovascular Genetics
- Proteomics
- Medical Science
Background:
- Hypertension causes significant myocardial remodeling and heart failure.
- Identifying the specific mediators of this process is crucial for targeted interventions.
Purpose of the Study:
- To investigate the causal impact of blood pressure on cardiac traits using Mendelian randomization.
- To identify plasma proteins that mediate the effects of blood pressure on cardiac remodeling and heart failure risk.
Main Methods:
- A Mendelian randomization design was employed to assess the causal relationships.
- Mediation analyses were conducted to pinpoint plasma protein mediators.
- Cardiac magnetic resonance imaging traits and heart failure risk were evaluated.
Main Results:
- Higher systolic blood pressure (SBP), diastolic blood pressure (DBP), and pulse pressure were causally linked to increased left ventricular myocardial mass and altered wall thickness.
- Specific plasma proteins, including fibroblast growth factor 5 (FGF5) and leptin, were identified as mediators.
- FGF5 mediated the effects of SBP and DBP on myocardial wall thickness and heart failure susceptibility.
Conclusions:
- This study provides evidence for specific circulating plasma proteins as key mediators of hypertension-driven cardiac remodeling.
- The findings highlight potential therapeutic targets for preventing and treating hypertension-related heart conditions.
Background:
This study focused on circulating plasma protein profiles to identify mediators of hypertension-driven myocardial remodeling and heart failure.
Methods:
A Mendelian randomization design was used to investigate the causal impact of systolic blood pressure (SBP), diastolic blood pressure (DBP), and pulse pressure on 82 cardiac magnetic resonance traits and heart failure risk. Mediation analyses were also conducted to identify potential plasma proteins mediating these effects.
Results:
Genetically proxied higher SBP, DBP, and pulse pressure were causally associated with increased left ventricular myocardial mass and alterations in global myocardial wall thickness at end diastole. Elevated SBP and DBP were linked to increased regional myocardial radial strain of the left ventricle (basal anterior, mid, and apical walls), while higher SBP was associated with reduced circumferential strain in specific left ventricular segments (apical, mid-anteroseptal, mid-inferoseptal, and mid-inferolateral walls). Specific plasma proteins mediated the impact of blood pressure on cardiac remodeling, with FGF5 (fibroblast growth factor 5) contributing 2.96% (P=0.024) and 4.15% (P=0.046) to the total effect of SBP and DBP on myocardial wall thickness at end diastole in the apical anterior segment and leptin explaining 15.21% (P=0.042) and 23.24% (P=0.022) of the total effect of SBP and DBP on radial strain in the mid-anteroseptal segment. Additionally, FGF5 was the only mediator, explaining 4.19% (P=0.013) and 4.54% (P=0.032) of the total effect of SBP and DBP on heart failure susceptibility.
Conclusions:
This mediation Mendelian randomization study provides evidence supporting specific circulating plasma proteins as mediators of hypertension-driven cardiac remodeling and heart failure.
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