Activity-dependent activation of presynaptic protein kinase C mediates post-tetanic potentiation.
Vesicle exocytosis is mediated by the complex interaction between synaptic vesicle and plasma membrane proteins, many of which are substrates for protein kinases. Exogenous protein kinase activators increase release probability at several mammalian CNS synapses, but the physiological conditions under which presynaptic protein kinases become activated are not known. We report here that calcium/phospholipid-dependent protein kinase C (PKC) is activated by high-frequency stimulation and mediates post-tetanic potentiation (PTP) in the rat hippocampus.
Brager
Darrin H
DH
Department of Physiology, University of Maryland School of Medicine, 655 W. Baltimore Street, Baltimore, Maryland 21201, USA.
Cai
Xiang
X
Thompson
Scott M
SM
D000818:Animals; D002118:Calcium / Q000378:metabolism; D020013:Calcium Signaling / Q000187:drug effects / Q000502:physiology; D004558:Electric Stimulation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D005089:Exocytosis / Q000187:drug effects / Q000502:physiology; D018698:Glutamic Acid / Q000378:metabolism; D006624:Hippocampus / Q000187:drug effects / Q000201:enzymology*; D009924:Organ Culture Techniques; D017729:Presynaptic Terminals / Q000187:drug effects / Q000201:enzymology*; D011493:Protein Kinase C / Q000187:drug effects / Q000378:metabolism*; D017966:Pyramidal Cells / Q000187:drug effects / Q000502:physiology; D051381:Rats; D013570:Synaptic Membranes / Q000187:drug effects / Q000378:metabolism; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology*; D013572:Synaptic Vesicles / Q000187:drug effects / Q000378:metabolism
D004791:Enzyme Inhibitors; D018698:Glutamic Acid; D011493:Protein Kinase C; D002118:Calcium