(Rac)-Rotigotine (hydrochloride)

(Rac)-Rotigotine hydrochloride is a racemate of Rotigotine. Rotigotine is a full agonist of?dopamine receptor, a partial agonist of the?5-HT1A receptor, and an antagonist of the?α2B-adrenergic receptor, with?K_is of 0.71?nM, 4-15?nM, and 83?nM for the dopamine D3 receptor and D2, D5, D4 receptors, and dopamine D1 receptor. IC50 & Target:Ki: Dopamine receptor; 5-HT receptor^[1][2] In Vitro: Rotigotine has a 10-fold selectivity for D3 (pK_i=9.2) receptors compared with D2, D4 and D5 (pK_i=8.5-8.0) and a 100-fold selectivity compared with D1 receptors (pK_i=7.2). In functional studies, Rotigotine behaves as full agonist at all dopamine receptors but notably the potency for stimulation of D1 receptors is similar to that for D2 and D3 receptors (pEC₅₀?respectively: 9.0, 9.4-8.6, 9.7)^[1].
Rotigotine (10 μM) decreases the number of THir neurons by 40% in primary mesencephalic cell culture. Rotigotine (0.01 μM) slightly protects dopaminergic neurons against MPP+?toxicity, significantly protects dopaminergic neurons against rotenone-induced cell death, and significantly inhibits ROS production by rotenone^[4].
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