A synaptic potentiation by a protein factor distinct from those induced by neurotrophins.
We report a protein factor(s) contained in the conditioned medium (CM) of the Mg(2+)-free treatment induced the synaptic potentiation. This type of potentiation shared a different pathway from those induced by neurotrophins. Neurotrophins were confirmed to induce a synaptic potentiation in the dissociated chick neurons. Furthermore, K252a, an inhibitor of tyrosine kinase, abolished this potentiation. Nevertheless, the potentiation induced by the CM was not blocked by K252a. In addition, the CM prepared from the chick neurons induced a similar potentiation in rat and mouse neurons. These results suggest that the protein factor is a novel protein molecule for inducing the potentiation and it plays a critical role in the common mechanism for the potentiation between avian and mammal.
Kudoh
Suguru N
SN
Neuronics Research Group, Special Division for Human Life Technology, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.
Kiyosue
Kazuyuki
K
Taguchi
Takahisa
T
D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism / Q000494:pharmacology; D002227:Carbazoles / Q000494:pharmacology; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D002642:Chick Embryo; D017077:Culture Media, Conditioned / Q000494:pharmacology; D004791:Enzyme Inhibitors / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D005333:Fetus; D006624:Hippocampus / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D026121:Indole Alkaloids; D051379:Mice; D008813:Mice, Inbred ICR; D009414:Nerve Growth Factors / Q000378:metabolism* / Q000494:pharmacology; D009419:Nerve Tissue Proteins / Q000378:metabolism* / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism*; D020933:Neurotrophin 3 / Q000378:metabolism / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D020794:Receptor Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D013569:Synapses / Q000187:drug effects / Q000378:metabolism*; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology*
D019208:Brain-Derived Neurotrophic Factor; D002227:Carbazoles; D017077:Culture Media, Conditioned; D004791:Enzyme Inhibitors; D026121:Indole Alkaloids; D009414:Nerve Growth Factors; D009419:Nerve Tissue Proteins; D020933:Neurotrophin 3; C049985:staurosporine aglycone; D020794:Receptor Protein-Tyrosine Kinases