In vivo BDNF modulation of adult functional and morphological synaptic plasticity at hippocampal mossy fibers.
Brain-derived neurotrophic factor (BDNF) has been proposed as a key regulator and mediator of long-term synaptic modifications related to learning and memory maintenance. Our previous studies show that application of high-frequency stimulation (HFS) sufficient to elicit LTP at the dentate gyrus (DG)-CA3 pathway produces mossy fiber structural modifications 7 days after tetanic stimulation. In the present study, we show that acute intrahippocampal microinfusion of BDNF induces a lasting potentiation of synaptic efficacy in the DG-CA3 projection of anesthetized adult rats. Furthermore, we show that BDNF functional modifications in synaptic efficacy are accompanied by a presynaptic structural long-lasting reorganization at the hippocampal mossy fiber pathway. These findings support the idea that BDNF plays an important role as synaptic messenger of activity-dependent synaptic plasticity in the adult mammalian brain, in vivo.
Gómez-Palacio-Schjetnan
Andrea
A
División de Investigación y Estudios de Posgrado, Facultad de Psicología, Universidad Nacional Autónoma de México, C.P. 04510 Mexico D.F., Mexico.
Escobar
Martha L
ML
D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism / Q000494:pharmacology*; D002227:Carbazoles / Q000494:pharmacology; D045304:Cytochromes c / Q000494:pharmacology; D004307:Dose-Response Relationship, Radiation; D004558:Electric Stimulation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D026121:Indole Alkaloids / Q000494:pharmacology; D017774:Long-Term Potentiation / Q000187:drug effects* / Q000502:physiology / Q000528:radiation effects; D008297:Male; D019599:Mossy Fibers, Hippocampal / Q000187:drug effects*; D051381:Rats; D017208:Rats, Wistar; D013569:Synapses / Q000187:drug effects* / Q000502:physiology; D009435:Synaptic Transmission / Q000187:drug effects* / Q000502:physiology / Q000528:radiation effects
D019208:Brain-Derived Neurotrophic Factor; D002227:Carbazoles; D004791:Enzyme Inhibitors; D026121:Indole Alkaloids; D045304:Cytochromes c; C049985:staurosporine aglycone