RO27-3225 TFA is a potent and selective agonist of melanocortin 4 receptor (MC4R; EC50: 1 nM and 8 nM for MC4R and MC1R) with neuroprotective and anti-inflammatory effects. RO27-3225 TFA shows ~30-fold selectivity for MC4R over MC3R.
SHU 9119 is an effective human melanocortin 3 and 4 receptors (MC3 4R) antagonist and a partial MC5R agonist (IC50: 0.23, 0.06, and 0.09 nM for human MC3R, MC4R and MC5R, respectively).
Melanotan II acetate is an agonist of melanocortin receptor 1 (MC1R), MC3R, MC4R, and MC5R. It has been shown to improve recovery of sciatic nerve function after mechanical injury and increase cisplatin-induced decreases in sensory nerve conduction velocity. Melanotan II acetate increases oxygen consumption and protein levels of uncoupling protein 1 (UCP1) in brown adipose tissue homogenates and decreases food intake, body weight, and serum levels of leptin, glucose, insulin, and cholesterol.