2010). AChEIs are used in AD to counteract/delay cognitive decline. It is well established that cognitive decline in AD correlates with deficits in cholinergic function

due to reduction of acetylcholine (ACh) levels (Davies and Maloney 1976; White et al. 1977). AChEIs preserve ACh from degradation, thus sustaining cholinergic neurotransmission. Galantamine is an AChEI currently marketed for the treatment of AD. Relevant to this study, in addition to its cognitive-enhancing effects, galantamine has also been reported to have neuroprotective activity against glutamate toxicity in Inhibitors,research,lifescience,medical rat neurons, possibly via stimulation of nicotinic ACh receptors (nAChRs) (Takada et al. 2003; Akasofu et al. 2006). Herein, to achieve a better understanding of Inhibitors,research,lifescience,medical the neuroprotective profile of the galantamine/memantine combination, we studied the effect of these drugs, administered either separately or together, against NMDA-induced neurotoxicity in rat cortical neurons. We show that galantamine and memantine (or ifenprodil)

are neuroprotective when given separately, as previously reported. Moreover, Inhibitors,research,lifescience,medical combinations of subactive concentrations of galantamine with memantine (or ifenprodil) can afford a full neuroprotective effect, suggesting a reciprocal potentiation in counteracting the excitotoxic cascade triggered by NMDA. Material and Methods Reagents Neurobasal (NB) medium, B27 supplement, penicillin/streptomycin, l-glutamine, and fetal bovine serum (FBS) were from Gibco (Paisley, U.K.).

Cytotoxicity detection (LDH, lactate dehydrogenase) Inhibitors,research,lifescience,medical and cell proliferation (MTT, 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay kits were acquired from Roche Inhibitors,research,lifescience,medical (Mannheim, Germany). Poly-d-lysine-coated plates were purchased from BD Biosciences (Bedford, MA). Memantine hydrochloride, ifenprodil hemitartarate, methyllycaconitine (MCC) citrate, dihydro-β-erythroidine (DHBE) hydrobromide, and AR-”type”:”entrez-nucleotide”,”attrs”:”text”:”R17779″,”term_id”:”771389″,”term_text”:”R17779″R17779 too (ARR) hydrochloride were obtained from Tocris (Bristol, U.K.). N-Methyl-d-Aspartate, galantamine hydrobromide, MK-801, and all other reagents were from Sigma (Saint Louis, MO). Animals Pregnant Sprague-Dawley female rats were obtained from Charles River Italia (Calco, Italy). The animals were maintained in a temperature- and humidity-controlled colony room under a 12-h day–night cycle and were individually housed in plastic cages, having free access to food and water ad libitum. All procedures were performed in compliance with Italian click here regulations on the protection of animals used for experimental and other scientific purposes (D.M. 116192), and with European Economic Community regulations (O.J. of E.C. L 358/1 12/18/1986).