Reduced synaptic plasticity in the lateral perforant path input to the dentate gyrus of aged C57BL/6 mice.
J Neurophysiol
; 90(1): 32-8, 2003 Jul.
Article
en En
| MEDLINE
| ID: mdl-12634277
ABSTRACT
Hippocampal slices obtained from C57BL/6 mice (3-25 mo) were used to investigate the effects of aging on excitatory postsynaptic potentials (EPSPs) elicited in dentate gyrus with lateral perforant path stimulation. The maximal amplitude of the EPSP, as well as the degree of paired-pulse facilitation, was significantly reduced in animals aged 12 mo or more compared with younger animals (<12 mo). Although all animals showed equivalent short-term potentiation (STP) in response to high-frequency stimulation, this did not translate into a long-lasting increase in synaptic efficacy in the older animals. A significant degree of long-term potentiation (LTP) of synaptic efficacy was only observed in animals <12 mo of age when measured 30 min after induction. Blocking GABAA-mediated inhibition significantly enhanced STP in younger and older animals; however, a significant degree of LTP was again only observed in slices taken from younger animals. These data indicate that the lateral perforant path input to the dentate gyrus is altered by the aging process, and that this results in a reduction in the capacity of this input to exhibit long-lasting synaptic plasticity.
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Bases de datos:
MEDLINE
Asunto principal:
Envejecimiento
/
Potenciación a Largo Plazo
/
Transmisión Sináptica
/
Giro Dentado
/
Vía Perforante
/
Plasticidad Neuronal
Límite:
Animals
Idioma:
En
Revista:
J Neurophysiol
Año:
2003
Tipo del documento:
Article
País de afiliación:
Canadá