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Evaluation of Vascular Control Mechanisms Utilizing Video Microscopy of Isolated Resistance Arteries of Rats
Published on: December 5, 2017
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15-Hydroxyeicosatetraenoic Acid and GPR39 Together Orchestrate Coronary Autoregulation: A Comprehensive Metabolomic
D Elizabeth Le1,2, Masaki Kajimoto1, Yan Zhao1
1Knight Cardiovascular Institute.
Biorxiv : the Preprint Server for Biology
|April 3, 2026
Summary
The G protein-coupled receptor 39 (GPR39) and 15-hydroxyeicosatetraenoic acid (15-HETE) are key to maintaining constant coronary blood flow (CBF) during reduced coronary driving pressure (CDP). Blocking GPR39 abolishes this vital autoregulation.
Area of Science:
- Cardiovascular Physiology
- Molecular Mechanisms of Autoregulation
- G Protein-Coupled Receptors
Background:
- Coronary autoregulation maintains constant coronary blood flow (CBF) despite changes in coronary driving pressure (CDP).
- The precise molecular mechanisms underlying coronary autoregulation remain largely unknown.
- This study investigates the role of G protein-coupled receptor 39 (GPR39) and its agonist 15-hydroxyeicosatetraenoic acid (15-HETE) in this process.
Purpose of the Study:
- To elucidate the mechanism of coronary autoregulation.
- To test the hypothesis that GPR39 and 15-HETE orchestrate coronary autoregulation.
Main Methods:
- Coronary stenoses were created in dogs to measure CBF and CDP.
- Blood samples were analyzed for various metabolites, including 15-HETE.
- A specific GPR39 antagonist (VC108) was administered to assess its impact on hemodynamics and coronary autoregulation.
Main Results:
- GPR39 was identified in coronary arterioles and heart tissue.
- 15-HETE levels correlated with CDP within the autoregulatory range.
- Administration of VC108 abolished coronary autoregulation, making CBF directly dependent on CDP and decreasing coronary microvascular resistance.
Conclusions:
- GPR39 and 15-HETE play a crucial role in mediating coronary autoregulation when coronary driving pressure is reduced.
- These findings reveal a novel mechanism for coronary autoregulation.
- This discovery may inform future pharmacological treatments for coronary syndromes.
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