title: Cholinergic modulation of the resonance properties of stellate cells in layer II of medial entorhinal cortex.
abstract: In vitro whole cell patch-clamp recordings of stellate cells in layer II of medial entorhinal cortex show a subthreshold membrane potential resonance in response to a sinusoidal current injection of varying frequency. Physiological recordings from awake behaving animals show that neurons in layer II medial entorhinal cortex, termed "grid cells," fire in a spatially selective manner such that each cell's multiple firing fields form a hexagonal grid. Both the spatial periodicity of the grid fields and the resonance frequency change systematically in neurons along the dorsal to ventral axis of medial entorhinal cortex. Previous work has also shown that grid field spacing and acetylcholine levels change as a function of the novelty to a particular environment. Using in vitro whole cell patch-clamp recordings, our study shows that both resonance frequency and resonance strength vary as a function of cholinergic modulation. Furthermore, our data suggest that these changes in resonance properties are mediated through modulation of h-current and m-current.
authors.affiliation: Center for Memory and Brain, Program in Neuroscience, and Psychology Department, Boston University, Boston, Massachusetts 02215, USA. jimheys@bu.edu
authors.forename: James G
authors.initials: JG
authors.lastname: Heys
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Giocomo
authors.forename: Michael E
authors.initials: ME
authors.lastname: Hasselmo
mesh_terms: D000465:Algorithms; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D002217:Carbachol / Q000494:pharmacology; D048430:Cell Shape; D003198:Computer Simulation; D054815:Cyclic Nucleotide-Gated Cation Channels / Q000502:physiology; D055724:Electrophysiological Phenomena; D018728:Entorhinal Cortex / Q000737:chemistry* / Q000187:drug effects / Q000502:physiology*; D005260:Female; D064428:Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels; D066298:In Vitro Techniques; D007473:Ion Channels / Q000502:physiology; D008297:Male; D008564:Membrane Potentials / Q000502:physiology; D008959:Models, Neurological; D018721:Muscarinic Agonists / Q000494:pharmacology; D018727:Muscarinic Antagonists / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D010275:Parasympathetic Nervous System / Q000187:drug effects / Q000502:physiology*; D018408:Patch-Clamp Techniques; D015221:Potassium Channels / Q000502:physiology; D051381:Rats; D020318:Rats, Long-Evans; D011976:Receptors, Muscarinic / Q000187:drug effects
chemical_list: D054815:Cyclic Nucleotide-Gated Cation Channels; D064428:Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels; D007473:Ion Channels; D018721:Muscarinic Agonists; D018727:Muscarinic Antagonists; D015221:Potassium Channels; D011976:Receptors, Muscarinic; D001285:Atropine; D002217:Carbachol
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