Rotigotine hydrochloride

Rotigotine hydrochloride (CAS No. 125572-93-2) is the hydrochloride salt form of Rotigotine (CAS No. 99755-59-6). Rotigotine is a non-ergot dopamine receptor full agonist. Its core biological functions include improving motor and non-motor symptoms of Parkinson’s disease (PD), relieving symptoms of restless legs syndrome (RLS), exerting neuroprotective and antioxidant effects, and it also has potential antidepressant activity; targets and mode of action include activation of dopamine D1-D5 receptors (highest affinity for D2 and D3), activation of the 5-HT1A receptor, and antagonism of the α2B adrenergic receptor; key activity data: pEC50 values (D1: 9.6±0.1, D2: 10.4±0.1, D3: 8.2±0.2, D4: 7.7±0.1, D5: 7.7±0.2), Ki values (D3: 0.71 nM, D4.2: 3.9 nM, D5: 5.4 nM, D2: 13.5 nM, D1: 83 nM); in animal studies it is commonly used for model treatment, with common models including 6-OHDA/MPTP-induced PD models, haloperidol-induced PD-related motor disorder models, olfactory bulbectomy / learned helplessness / forced swim depression models, and PD-related overactive bladder models.

Common applications and concentrations: in cell culture, 5 μg/mL in SH-SY5Y cells for neuroprotection, 2.5-25 μg/mL for cytotoxicity evaluation; in animal studies, intravenous injection 0.125-0.5 mg/kg, subcutaneous injection 0.05-5 mg/kg/day, intranasal administration 50 μL (nanoparticles containing 2 mg/kg drug); clinically, it is mainly used as a transdermal patch, with an initial dose of 2 mg/24 h (maximum 6-8 mg/24 h) in early-stage PD patients, 4 mg/24 h (maximum 16 mg/24 h) in advanced-stage PD, and an initial dose of 1 mg/24 h (maximum 3 mg/24 h) in RLS patients.

Effective treatment concentrations: in animal studies, 0.25-0.5 mg/kg intravenous injection can improve urinary function in PD rats; 5 μg/mL nanoparticles can reduce α-synuclein levels in SH-SY5Y cells and increase tyrosine hydroxylase expression; 0.3 mg/kg subcutaneous injection every 2 days can reverse hyperactivity in rats in a depression model; clinically, 1-8 mg/24 h transdermal patches can significantly improve PD motor symptoms (reduced UPDRS scores) and reduce RLS symptoms (reduced IRLS scores), and can exert neuroprotective effects through antioxidation (increased SOD activity, reduced ROS production) and inhibition of inflammatory factor release.

References:

[1] Bertaina-Anglade V, La Rochelle CD, Scheller DK. Antidepressant properties of rotigotine in experimental models of depression. Eur J Pharmacol. 2006 Oct 24;548(1-3):106-14. doi: 10.1016/j.ejphar.2006.07.022. Epub 2006 Jul 22. PMID: 16959244.

[2] Benitez A, Edens H, Fishman J, Moran K, Asgharnejad M. Rotigotine transdermal system: developing continuous dopaminergic delivery to treat Parkinson's disease and restless legs syndrome. Ann N Y Acad Sci. 2014 Nov;1329:45-66. doi: 10.1111/nyas.12508. Epub 2014 Aug 21. PMID: 25145951.

[3] Bhattamisra SK, Shak AT, Xi LW, Safian NH, Choudhury H, Lim WM, Shahzad N, Alhakamy NA, Anwer MK, Radhakrishnan AK, Md S. Nose to brain delivery of rotigotine loaded chitosan nanoparticles in human SH-SY5Y neuroblastoma cells and animal model of Parkinson's disease. Int J Pharm. 2020 Apr 15;579:119148. doi: 10.1016/j.ijpharm.2020.119148. Epub 2020 Feb 19. PMID: 32084576.

[4] Mendes TC, Pinto EC, Cabral LM, de Sousa VP. Rotigotine: A Review of Analytical Methods for the Raw Material, Pharmaceutical Formulations, and Its Impurities. J AOAC Int. 2021 Jun 12;104(3):592-604. doi: 10.1093/jaoacint/qsaa145. PMID: 33276374.

[5] Ouchi M, Kitta T, Chiba H, Higuchi M, Togo M, Abe-Takahashi Y, Shinohara N. Mechanisms of D1/D2-like dopaminergic agonist, rotigotine, on lower urinary tract function in rat model of Parkinson's disease. Sci Rep. 2022 Mar 16;12(1):4540. doi: 10.1038/s41598-022-08612-3. PMID: 35296748; PMCID: PMC8927603.