6533b870fe1ef96bd12cfe16
RESEARCH PRODUCT
Distinct effects of atypical 1,4-dihydropyridines on 1-methyl-4-phenylpyridinium-induced toxicity.
Alexander ZharkovskyVija KlusaGunars DubursAnti KaldaAllen KaasikLinda Klimaviciusasubject
Membrane potentialNeurons1-Methyl-4-phenylpyridiniumDihydropyridinesCell DeathMolecular Structure1-Methyl-4-phenylpyridiniumClinical BiochemistryCell BiologyGeneral MedicineMitochondrionPharmacologyBiologymedicine.disease_causeBiochemistryNeuroprotectionMechanism of actionmedicinemedicine.symptomMode of actionReactive Oxygen SpeciesOxidative stressIntracellularCells Cultureddescription
Our previous data obtained from in vivo experiments demonstrated high neuroprotective effects of three novel atypical neuronal non-calcium antagonistic 1,4-dihydropyridine (DHP) derivatives cerebrocrast, glutapyrone and tauropyrone. The present studies were carried out in vitro to clarify, at least in part, their mechanism of action in primary culture of cerebellar granule cells by use of 1-methyl-4-phenylpyridinium (MPP+) as a neurotoxic agent which causes dramatic oxidative stress. Cerebrocrast (highly lipophilic, with a classical two-ring structure) dose-dependently (0.01-10.0 microM, EC50 = 13 nM) reduced MPP+-induced cell death. At the same time, the calcium antagonist nimodipine (reference drug) protected cell death at much higher concentrations (EC50 = 12.4 microM). Cerebrocrast decreased also the generation of reactive oxygen species and loss of mitochondrial membrane potential. In contrast, low lipophilic amino acid-containing DHPs glutapyrone and tauropyrone (glutamate- and taurine-containing, correspondingly) were without significant effects indicating their distinct mode of action in comparison to cerebrocrast. We have demonstrated for the first time an ability of atypical non-calcium antagonistic DHP cerebrocrast (which has classical DHP structure elements and high lipophilicity) to protect MPP+-induced deterioration of mitochondrial bioenergetics. One may suggest mitochondria as an essential intracellular target for the neuroprotective action of cerebrocrast and indicate its usefulness in the treatment of Parkinson's disease.
year | journal | country | edition | language |
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2006-08-24 | Cell biochemistry and function |