Biomaterial Database

Synergistic center-surround receptive field model of monkey H1 horizontal cells. 2005

Orin S Packer, and Dennis M Dacey

Department of Biological Structure, University of Washington, Seattle, WA 98195, USA. orin@u.washington.edu

Horizontal cells typical of the vertebrate retina are strongly coupled by gap junctions. The resulting horizontal cell network has extremely large receptive fields that extend well beyond the boundaries of a single dendritic tree. This network has been modeled as a syncytium of cytoplasm bounded by cell membrane (Lamb 1976; Naka & Rushton, 1967). Horizontal cells in the primate retina are also coupled by gap junctions, but their receptive fields are relatively small and in some cases may approximate the span of the dendritic tree of an individual cell (Packer & Dacey, 2002). The receptive field of the macaque H1 horizontal cell type has been modeled as the sum of two spatial components: a strong but small diameter excitatory center, and a weak but broad excitatory surround. Here we explore the hypothesis that the receptive field center of H1 cells derives from direct cone synaptic input and that the synergistic surround derives from gap-junctional coupling among H1 cell neighbors. We measured the receptive field structure of H1 cells in the presence of carbenoxolone, a gap junction blocker, to determine the effects of uncoupling center and surround components and compared these data to a neural simulation of the H1 network in which gap-junctional conductance could be manipulated. Carbenoxolone reduced the surround component and eliminated irregularities in spatial structure thought to be associated with the surround. The effects of carbenoxolone could be mimicked by manipulating gap-junctional conductance in an H1 cell network simulation. These results provide strong support for the two-component model of H1 receptive field structure. In addition, carbenoxolone eliminated a slow depolarization following light onset thought to be mediated by cone-H1 feedback (Kamermans & Spekreijse, 1999). Low concentrations of cobalt, a calcium channel blocker that spares gap junctions, had an effect similar to that of carbenoxolone but did not affect receptive field structure. These results are consistent with a calcium-mediated mechanism of feedback from H1 cells to cones that is independent of the synergistic two-component model of receptive field organization.

UI	MeSH Term	Description	Entries
D008252	Macaca fascicularis	A species of the genus MACACA which typically lives near the coast in tidal creeks and mangrove swamps primarily on the islands of the Malay peninsula.	Burmese Long-Tailed Macaque,Crab-Eating Monkey,Cynomolgus Monkey,M. f. aurea,M. fascicularis,Macaca fascicularis aurea,Monkey, Crab-Eating,Monkey, Cynomolgus,Crab-Eating Macaque,Burmese Long Tailed Macaque,Crab Eating Macaque,Crab Eating Monkey,Crab-Eating Macaques,Crab-Eating Monkeys,Cynomolgus Monkeys,Long-Tailed Macaque, Burmese,Macaque, Burmese Long-Tailed,Macaque, Crab-Eating,Monkey, Crab Eating
D008254	Macaca nemestrina	A species of the genus MACACA which inhabits Malaya, Sumatra, and Borneo. It is one of the most arboreal species of Macaca. The tail is short and untwisted.	M. leonina,Macaca nemestrina leonina,Macaca nemestrina pagensis,Macaca nemestrina siberu,Macaca siberu,Monkey, Pig-Tailed,Pagai Macaque,Pig-Tail Macaque,Pig-Tailed Macaque,Pig-Tailed Monkey,M. pagensis,Macaca pagensis,Monkey, Pigtail,Monkey, Pigtailed,Pigtail Macaque,Macaque, Pagai,Macaque, Pig-Tail,Macaque, Pig-Tailed,Macaque, Pigtail,Monkey, Pig Tailed,Pagai Macaques,Pig Tail Macaque,Pig Tailed Macaque,Pig Tailed Monkey,Pig-Tail Macaques,Pig-Tailed Macaques,Pig-Tailed Monkeys,Pigtail Macaques,Pigtail Monkey,Pigtail Monkeys,Pigtailed Monkey,Pigtailed Monkeys
D008959	Models, Neurological	Theoretical representations that simulate the behavior or activity of the neurological system, processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.	Neurologic Models,Model, Neurological,Neurologic Model,Neurological Model,Neurological Models,Model, Neurologic,Models, Neurologic
D009415	Nerve Net	A meshlike structure composed of interconnecting nerve cells that are separated at the synaptic junction or joined to one another by cytoplasmic processes. In invertebrates, for example, the nerve net allows nerve impulses to spread over a wide area of the net because synapses can pass information in any direction.	Neural Networks (Anatomic),Nerve Nets,Net, Nerve,Nets, Nerve,Network, Neural (Anatomic),Networks, Neural (Anatomic),Neural Network (Anatomic)
D010215	Papio	A genus of the subfamily CERCOPITHECINAE, family CERCOPITHECIDAE, consisting of five named species: PAPIO URSINUS (chacma baboon), PAPIO CYNOCEPHALUS (yellow baboon), PAPIO PAPIO (western baboon), PAPIO ANUBIS (or olive baboon), and PAPIO HAMADRYAS (hamadryas baboon). Members of the Papio genus inhabit open woodland, savannahs, grassland, and rocky hill country. Some authors consider MANDRILLUS a subgenus of Papio.	Baboons,Baboons, Savanna,Savanna Baboons,Baboon,Baboon, Savanna,Papios,Savanna Baboon
D010775	Photic Stimulation	Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.	Stimulation, Photic,Visual Stimulation,Photic Stimulations,Stimulation, Visual,Stimulations, Photic,Stimulations, Visual,Visual Stimulations
D011323	Primates	An order of mammals consisting of more than 300 species that include LEMURS; LORISIDAE; TARSIERS; MONKEYS; and HOMINIDS. They are characterized by a relatively large brain when compared with other terrestrial mammals, forward-facing eyes, the presence of a CALCARINE SULCUS, and specialized MECHANORECEPTORS in the hands and feet which allow the perception of light touch.	Primate
D002229	Carbenoxolone	An agent derived from licorice root. It is used for the treatment of digestive tract ulcers, especially in the stomach. Antidiuretic side effects are frequent, but otherwise the drug is low in toxicity.	Carbenoxalone,18alpha-Carbenoxolone,18alpha-Glycyrrhetinic Acid 3beta-O-Hemisuccinate,Biogastrone,Bioral,Carbeneoxolone,Carbenoxolone Disodium Salt,Carbenoxolone Sodium,Carbosan,Duogastrone,Glycyrrhetinic Acid 3-O-hemisuccinate,Pharmaxolon,Sanodin,18alpha Carbenoxolone,18alpha Glycyrrhetinic Acid 3beta O Hemisuccinate,3-O-hemisuccinate, Glycyrrhetinic Acid,3beta-O-Hemisuccinate, 18alpha-Glycyrrhetinic Acid,Acid 3-O-hemisuccinate, Glycyrrhetinic,Acid 3beta-O-Hemisuccinate, 18alpha-Glycyrrhetinic,Glycyrrhetinic Acid 3 O hemisuccinate
D003035	Cobalt	A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis.	Cobalt-59,Cobalt 59
D004594	Electrophysiology	The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.