Ki = 18.9 nM for human adenosine A3 receptor
Ki = 113 nM for rat adenosine A3 receptor
MRS1523 is a selective adenosine A3 receptor (A3R) antagonist. A3R is strongly overexpressed in cancer cell lines and cancer tissues. The activation of the A3R is related to several second messenger systems which are for signaling pathways including asthmatic, inflammatory, and ischemic responses.
In vitro: MRS1523 reversed the increase in mRNA expression in B16-F10 Melanoma Cells. Also, MRS1523 antagonized the modulation in the expression level of the proteins, which indicated that adenosine A3R mediated the responses [1].
Reference:
[1]. Madi, L., Rosenberg-Haggen, B., Nyska, A., & Korenstein, R. Enhancing pigmentation via activation of A3 adenosine receptors in B16 melanoma cells and in human skin explants. Experimental Dermatology. 2012; 22(1): 74-77.