Elevated plasma tyrosine kinases VEGF-D and HER4 in heart failure patients decrease after heart transplantation in...

Area of Science:

• Cardiovascular Biology
• Biomarker Discovery
• Transplantation Medicine

Background:

• Receptor tyrosine kinases (RTKs) play a role in cardiovascular remodeling.
• Heart failure (HF) and pulmonary hypertension (PH) significantly impact cardiovascular function.
• Understanding RTK involvement in HF-PH post-heart transplantation (HT) is crucial.

Purpose of the Study:

• To identify plasma RTK levels in HF patients with PH before and after HT.
• To investigate the association between RTK levels and hemodynamic changes post-transplantation.
• To explore the potential of RTKs as biomarkers for cardiovascular recovery.

Main Methods:

• Proximity extension assay used to analyze 28 RTKs and related proteins in plasma.
• Study included 20 healthy controls and 26 HF patients pre- and 1-year post-HT.
• Correlational analysis performed between plasma protein changes and hemodynamic parameters.

Main Results:

• Elevated plasma VEGF-D and HER4 levels found in end-stage HF patients compared to controls.
• Post-HT, VEGF-D and HER4 levels normalized and correlated with improvements in pulmonary artery pressure, wedge pressure, PAC, PVR, right atrial pressure, NT-proBNP, and cardiac index.
• VEGF-D normalization reflected reduced pulmonary congestion and restored pulmonary hemodynamics; HER4 normalization indicated decreased volume overload and improved cardiac function.

Conclusions:

• Plasma VEGF-D and HER4 levels are significantly altered in HF patients with PH.
• Normalization of VEGF-D and HER4 post-HT correlates with hemodynamic recovery and improved cardiac function.
• VEGF-D and HER4 show potential as biomarkers for monitoring cardiovascular status and recovery after heart transplantation.