On PN47, there were increases in the number of TUNEL+ cells in most hippocampal regions of both ETOH and NIC groups. In the NIC+ETOH group there were less severe effects. These results were paralleled by reductions in neuronal and glial cells densities for all treatment groups. In contrast, on PN50, ethanol and/or nicotine withdrawal were associated with compensatory
reductions in TUNEL+ cells in all hippocampal regions. These results were paralleled by a reversal of effects on neuronal and glial densities so that there were no longer differences between groups. www.selleckchem.com/products/nu7441.html There were no effects on region thicknesses. These results suggest that deleterious effects of nicotine and/or ethanol are reversed during prolonged withdrawal. (C) 2010 IBRO. Published by Elsevier Ltd. All rights reserved.”
“The protective effect of an iridoid catalpol extracted and purified from the traditional Chinese medicinal herb Rehmannia glutinosa find more on the neuronal degeneration of nigral-striatal dopaminergic pathway was studied in a chronic 1-methyl-4-phenyl-1,2,3,4-tetrahydropyridine (MPTP)/probenecid C57BL/6 mouse model and in 1-methyl-4-Phenylpyridimium (MPP(+)) intoxicated cultured mesencephalic neurons. Rotarod performance revealed that the locomotor ability of mice was significantly impaired after completion of model production and maintained thereafter for at least 4 weeks. Catelpol orally administered for 8 weeks (starting from the second week of model
production) dose dependently improved the locomotor ability. HPLC revealed that catalpol significantly elevated striatal dopamine levels without changing the metabolite/dopamine ratios. Nor did it bind to dopamine receptors. Therefore it is unlikely that catalpol resembles any of the known compounds for treating Parkinsonism. Instead, catalpol dose dependently raised the tyrosine hydroxylase (TH) neuron number in substantia nigra pars compacta (SNpc), the striatal dopamine transporter (DAT) density and the striatal glial cell derived neurotrophic factor (GDNF) protein level. Linear regression Lonafarnib cost revealed that both the TH neuron number and DAT density were positively correlated
to the GDNF level. In the cultured mesencephalic neurons, MPP(+) decreased the dopaminergic neuron number and shortened the neurite length, whereas catalpol showed protective effect dose dependently. Furthermore, the expression of GDNF mRNA was up-regulated by catalpol to a peak nearly double of normal control in neurons intoxicated with MPP(+) for 24 h but not in normal neurons. The GDNF receptor tyrosine kinase RET inhibitor 4-amino-5-(4-methyphenyl)-7-(t-butyl)-pyrazolo-(3,4-d)pyrimidine (PP1) abolished the protective effect of catalpol either partially (TH) positive neuron number) or completely (neurite length). Taken together, catalpol improves locomotor ability by attenuating the neuronal degeneration of nigral-striatal dopaminergic pathway, and this attenuation is at least partially through elevating the striatal GDNF expression.