Development of an Affinity-Based Probe to profile endogenous Human Adenosine A3 Receptor Expression

17 April 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The adenosine A3 receptor (A3AR) is a G protein-coupled receptor (GPCR) that exerts immunomodulatory effects in pathophysiological conditions such as inflammation and cancer. Thus far, studies towards the downstream effects of A3AR activation have yielded contradictory results, thereby motivating the need for further investigations. Various chemical and biological tools have been developed for this purpose, ranging from fluorescent ligands to antibodies. Nevertheless, these probes are limited by their reversible mode of binding, relatively large size and often low specificity. Therefore, in this work, we have developed a clickable and covalent affinity-based probe (AfBP) to target the human A3AR. Herein, we show validation of the synthesized AfBP in radioligand displacement, SDS-PAGE and confocal microscopy experiments, as well as utilization of the AfBP for the detection of endogenous A3AR expression in flow cytometry experiments. Ultimately, this AfBP will aid future studies towards the expression and function of the A3AR in pathologies.


Affinity based probe
Adenosine A3 receptor
receptor labeling

Supplementary materials

Supplementary Information
Experimental methods and additional figures


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