SNT-207858 is a selective and orally available melanocortin MC-4 receptor antagonist with a 170-fold selectivity vs. MC-3 and a 40-fold selectivity versus MC-5. SNT-207858 has an IC50 of 8 nM (binding) and 5 nM (function) on the MC-4 receptor.
Subcutaneous injection or oral treatment by gavage of SNT-207858 distinctly increase food intake in healthy mice. In mice subcutaneously implanted with C26 adenocarcinoma cells, repeated oral administration (starting the day after tumor implantation) of SNT-207858 almost completely prevents tumor induced weight loss, and diminished loss of lean body mass and fat mass[1].
[1]. Weyermann P, et al. Orally available selective melanocortin-4 receptor antagonists stimulate food intake and reduce cancer-induced cachexia in mice. PLoS One. 2009;4(3):e4774.