Document Type : Research article
Cellular and Molecular Research Centre- Iran University of Medical science
School of Medicine, Department of Pharmacology, Iran University of Medical Sciences, Tehran, Iran
In the present work we set out to investigate the neuroprotective effects of noscapine (0.5-2 µM) in presence of D-glucose on primary murine foetal cortical neurons after oxygen–glucose deprivation/24 hrs recovery. Cell viability, nitric oxide production and intracellular calcium ([ca2+]i) levels were evaluated by MTT assay, the modified Griess method and Fura-2 respectively. 25 and 100 mM D-glucose could, in a concentration dependent manner, improve cell viability and decrease NO production and [ca2+]i level in neuronal cells after ischemic insult. Moreover, pre-incubation of cells with noscapine, noticeably enhanced protective effects of 25 and 100 mM D-glucose compared to similar conditions without noscapine pre-treatment. In fact, noscapine attenuated NO production in a dose-dependent fashion, after 30 minutes (min) OGD, during high-glucose (HG) condition in cortical neurons. Pretreatment with 2 μM noscapine and 25 or 100 mM D-glucose, was shown to decrease the rise in [ca2+]i induced by Sodium azide/glucose deprivation (chemical OGD) model. These effects were more pronounced than that of 25 or 100 mM D-glucose alone.
The present study demonstrated that the neuroprotective effects of HG after an ischemic insult were augmented by pre-treatment with noscapine. Our results also suggested that the neuroprotection offered by both HG and noscapine involve attenuation of NO production and [ca2+]i levels stimulated by the experimental ischemia in cortical neurons.