Adenosine-Related Mechanisms in Non-Adenosine Receptor Drugs

Area of Science:

• Pharmacology
• Biochemistry
• Molecular Biology

Background:

• Adenosine receptors (ARs) are targeted by many drugs.
• Noncanonical drug effects on adenosinergic signaling are increasingly recognized.
• Understanding these non-AR mechanisms is crucial for drug development.

Purpose of the Study:

• To review the non-AR mechanisms through which drugs affect adenosinergic signaling.
• To explore the implications of these findings for AR-targeted therapeutic strategies.
• To assess the evidence supporting adenosine's role in drug efficacy.

Main Methods:

• Literature review of drugs affecting adenosinergic signaling through non-AR pathways.
• Analysis of mechanisms including adenosine transport inhibition and metabolic pathway alteration.
• Consideration of evidence strength, including AR knockout mouse studies.

Main Results:

• Non-AR drugs influence adenosine levels via transport inhibition (e.g., ticagrelor, ethanol) or metabolic changes (e.g., methotrexate).
• Some drugs exhibit dual activity, binding ARs and affecting adenosinergic signaling through non-AR means (e.g., mefloquine).
• The evidence for AR involvement varies significantly across different drugs.

Conclusions:

• Non-AR mediated adenosinergic effects represent a significant, often overlooked, aspect of drug action.
• Further investigation into these pathways is warranted, particularly for conditions like cancer and CNS disorders.
• This knowledge can inform the development of novel therapeutic approaches targeting ARs and related signaling.