Adenosine and adenosine receptor-mediated action in coronary microcirculation

Area of Science:

• Cardiovascular Physiology
• Molecular Pharmacology
• Biochemistry

Background:

• Adenosine is a key extracellular signaling molecule regulating coronary microcirculation.
• Adenosine levels are tightly controlled by enzymes and transporters.
• Adenosine receptors (ARs) mediate crucial cardiovascular functions.

Purpose of the Study:

• To review adenosine metabolism in the coronary microcirculation.
• To summarize the actions of adenosine receptors (ARs) in coronary microcirculation.
• To explore the role of adenosine-ARs signaling in cardiovascular diseases.

Main Methods:

• Literature review of adenosine metabolism.
• Analysis of adenosine receptor (AR) signaling pathways.
• Synthesis of data on ARs in cardiovascular disease models.

Main Results:

• Adenosine activates ARs, primarily A2AR, on endothelial and smooth muscle cells.
• AR activation stimulates downstream pathways (H2O2, KATP, KV, KCa2+) causing vasodilation.
• Altered adenosine-ARs signaling is implicated in hypertension, diabetes, atherosclerosis, and ischemic heart disease.

Conclusions:

• Adenosine and its receptors play a vital role in coronary microcirculation.
• Aberrant adenosine-ARs signaling contributes to cardiovascular pathologies.
• Adenosine and ARs hold therapeutic and diagnostic potential for heart conditions.