TY - JOUR
T1 - GABAergic drugs become neurotoxic in cortical neurons pre-exposed to brain-derived neurotrophic factor
AU - Molinaro, Gemma
AU - Battaglia, Giuseppe
AU - Riozzi, Barbara
AU - Storto, Marianna
AU - Fucile, Sergio
AU - Eusebi, Fabrizio
AU - Nicoletti, Ferdinando
AU - Bruno, Valeria
PY - 2008/2
Y1 - 2008/2
N2 - A 24-h pretreatment with BNDF enhanced excitotoxic neuronal death in cultured mouse cortical cells challenged with NMDA in the presence of extracellular Mg2+. The GABAA receptor antagonist, bicuculline, enhanced NMDA toxicity in control cultures but, unexpectedly, became neuroprotective in cultures pretreated with BDNF. In contrast, drugs that activate GABAA receptors (e.g. muscimol, benzodiazepines, or phenobarbital) or drugs that indirectly enhance GABAergic transmission were protective in control cultures but amplified NMDA toxicity after pretreatment with BDNF. The atypical behaviour of GABAergic drugs in cultures pretreated with BDNF depended on changes in the anion reversal potential because (i) increases in extracellular Cl- concentrations abolished the neurotoxic action of muscimol; (ii) muscimol stimulated 36Cl- efflux after pretreatment with BDNF; and (iii) exposure to BDNF reduced the expression of the neuronal K+/Cl- co-transporter, KCC2. Our data raise the concern that GABAergic drugs may become neurotoxic under conditions associated with increases in brain BDNF levels.
AB - A 24-h pretreatment with BNDF enhanced excitotoxic neuronal death in cultured mouse cortical cells challenged with NMDA in the presence of extracellular Mg2+. The GABAA receptor antagonist, bicuculline, enhanced NMDA toxicity in control cultures but, unexpectedly, became neuroprotective in cultures pretreated with BDNF. In contrast, drugs that activate GABAA receptors (e.g. muscimol, benzodiazepines, or phenobarbital) or drugs that indirectly enhance GABAergic transmission were protective in control cultures but amplified NMDA toxicity after pretreatment with BDNF. The atypical behaviour of GABAergic drugs in cultures pretreated with BDNF depended on changes in the anion reversal potential because (i) increases in extracellular Cl- concentrations abolished the neurotoxic action of muscimol; (ii) muscimol stimulated 36Cl- efflux after pretreatment with BDNF; and (iii) exposure to BDNF reduced the expression of the neuronal K+/Cl- co-transporter, KCC2. Our data raise the concern that GABAergic drugs may become neurotoxic under conditions associated with increases in brain BDNF levels.
KW - BDNF
KW - GABAA receptors
KW - Neuroprotection
UR - http://www.scopus.com/inward/record.url?scp=38649089431&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38649089431&partnerID=8YFLogxK
U2 - 10.1016/j.mcn.2007.10.009
DO - 10.1016/j.mcn.2007.10.009
M3 - Article
C2 - 18055218
AN - SCOPUS:38649089431
SN - 1044-7431
VL - 37
SP - 312
EP - 322
JO - Molecular and Cellular Neuroscience
JF - Molecular and Cellular Neuroscience
IS - 2
ER -