Rotigotine is a
dopamine receptor agonist that can improve motor function in
Parkinson's disease (PD) patients.
Rotigotine extended-release
microsphere (RoMS) is an extended-release intramuscular formulation that exhibits a sustained release of
rotigotine over a 14-day period. The clinical trials of RoMS has been carried out in USA and China. The purpose of this study is to observe the effects of RoMS
therapy on myocardial ischemic injury in mice, to know whether RoMS alleviate or deteriorate the myocardial ischemic injury while PD patient has onset of
myocardial ischemia concurrent after administered with RoMS. A mouse model of
myocardial ischemia was established using
isoproterenol, and mice were pretreated with
rotigotine or RoMS before inducing myocardial ischemic injury. The effects of
rotigotine or RoMS
therapy on the degree of myocardial ischemic injury were studied by evaluating
troponin I level,
creatine kinase-MB (CK-MB) activity, and histopathological changes in cardiomyocytes. The
dopamine receptor blocker
chlorpromazine was used to further investigate the effects of
rotigotine or RoMS on myocardial ischemic injury. Furthermore, serum
rotigotine concentrations were also assayed. When
myocardial ischemia occurred during
rotigotine or RoMS administration,
troponin I level and CK-MB activity were decreased, and
ischemia-induced histopathological changes in cardiomyocytes were alleviated. The effects of
rotigotine were maintained only 12 h and after that no protective effect was observed. RoMS releases continuously into the circulation after
intramuscular injection. The cardioprotective effects of RoMS were maintained 14 days after a single RoMS administration. When combined with
chlorpromazine, the protective effects of
rotigotine on myocardial ischemic injury were eliminated, and the protective effects of RoMS were also partially abolished. In the animal model of
myocardial ischemia, pretreatment with
rotigotine or RoMS does not deteriorate, but can alleviate cardiomyocyte injury. Furthermore, RoMS pretreatment show long-term and continuous protective effects on cardiomyocyte injury. RoMS
therapy in PD patients at high risk for
cardiovascular diseases may attenuate the degree of cardiomyocyte injury caused by
ischemia.