LTP in the lateral perforant path is beta-adrenergic receptor-dependent.
Norepinephrine induces an activity-independent long-lasting depression of synaptic transmission in the lateral perforant path input to dentate granule cells, whereas high frequency stimulation induces activity-dependent long-term potentiation (LTP). We investigated the role of endogenous activation of beta-adrenergic receptors in LTP of the lateral and medial perforant paths under conditions affording selective stimulation of these pathways in the rat hippo-campal slice. Propranolol (1 microM), a beta-receptor antagonist, blocked LTP induction of both lateral and medial perforant path-evoked field excitatory postsynaptic potentials. The results indicate a broad requirement for norepinephrine in different types of synaptic plasticity, including activity-independent depression and activity-dependent LTP in the lateral perforant path.
Bramham
C R
CR
Department of Pharmacology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814-4799, USA.
Bacher-Svendsen
K
K
Sarvey
J M
JM
D000818:Animals; D018891:Dentate Gyrus / Q000187:drug effects / Q000502:physiology; D004558:Electric Stimulation; D005071:Evoked Potentials / Q000187:drug effects / Q000502:physiology; D006624:Hippocampus / Q000502:physiology*; D066298:In Vitro Techniques; D017774:Long-Term Potentiation / Q000187:drug effects / Q000502:physiology*; D008297:Male; D009473:Neuronal Plasticity / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D009638:Norepinephrine / Q000494:pharmacology*; D011433:Propranolol / Q000494:pharmacology*; D017966:Pyramidal Cells / Q000187:drug effects / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D011943:Receptors, Adrenergic, beta / Q000502:physiology*; D013569:Synapses / Q000187:drug effects / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology; D013997:Time Factors
D011943:Receptors, Adrenergic, beta; D011433:Propranolol; D009638:Norepinephrine