Roles of periventricular neurons in retinotectal transmission in the optic tectum

2006 ◽  
Vol 79 (2) ◽  
pp. 112-121 ◽  
Author(s):  
Masae Kinoshita ◽  
Etsuro Ito
Keyword(s):  
Optic Tectum ◽  
Retinotectal Transmission

Retinotectal transmission in the optic tectum of rainbow trout

2005 ◽  
Vol 484 (2) ◽  
pp. 249-259 ◽  
Author(s):  
Masae Kinoshita ◽  
Masahiro Fukaya ◽  
Takuro Tojima ◽  
Satoshi Kojima ◽  
Hironori Ando ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Optic Tectum ◽  
Retinotectal Transmission

A Cholinergic Circuit Intrinsic to Optic Tectum Modulates Retinotectal Transmission via Presynaptic Nicotinic Receptors

1991 ◽  
Vol 627 (1 Activity-Driv) ◽  
pp. 363-367 ◽  
Author(s):  
W. MICHAEL KING ◽  
JOHN T. SCHMIDT
Keyword(s):  
Optic Tectum ◽  
Nicotinic Receptors ◽  
Retinotectal Transmission

scholarly journals Critical Effects on Akt Signaling in Adult Zebrafish Brain Following Alterations in Light Exposure

Cells ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 637
Author(s):  
Nicholas S. Moore ◽  
Robert A. Mans ◽  
Mackenzee K. McCauley ◽  
Colton S. Allgood ◽  
Keri A. Barksdale
Keyword(s):  
Optic Tectum ◽  
Visual Processing ◽  
Environmental Enrichment ◽  
Glycogen Synthase ◽  
Light Exposure ◽  
Hsp70 Expression ◽  
Light Cycle ◽  
Adult Zebrafish ◽  
Sleep State ◽  
Zebrafish Brain

Evidence from human and animal studies indicate that disrupted light cycles leads to alterations of the sleep state, poor cognition, and the risk of developing neuroinflammatory and generalized health disorders. Zebrafish exhibit a diurnal circadian rhythm and are an increasingly popular model in studies of neurophysiology and neuropathophysiology. Here, we investigate the effect of alterations in light cycle on the adult zebrafish brain: we measured the effect of altered, unpredictable light exposure in adult zebrafish telencephalon, homologous to mammalian hippocampus, and the optic tectum, a significant visual processing center with extensive telencephalon connections. The expression of heat shock protein-70 (HSP70), an important cell stress mediator, was significantly decreased in optic tectum of adult zebrafish brain following four days of altered light exposure. Further, pSer473-Akt (protein kinase B) was significantly reduced in telencephalon following light cycle alteration, and pSer9-GSK3β (glycogen synthase kinase-3β) was significantly reduced in both the telencephalon and optic tectum of light-altered fish. Animals exposed to five minutes of environmental enrichment showed significant increase in pSer473Akt, which was significantly attenuated by four days of altered light exposure. These data show for the first time that unpredictable light exposure alters HSP70 expression and dysregulates Akt-GSK3β signaling in the adult zebrafish brain.

Neurons are replenished in cultures of embryonic chick optic tectum after immunomagnetic depletion

1991 ◽  
Vol 146 (2) ◽  
pp. 278-291 ◽  
Author(s):  
Deni S. Galileo ◽  
Adrian P. Gee ◽  
Paul J. Linser
Keyword(s):  
Optic Tectum ◽  
Embryonic Chick

N-cholinergic facilitation of glutamate release from an individual retinotectal fiber in frog

2001 ◽  
Vol 18 (4) ◽  
pp. 549-558 ◽  
Author(s):  
A. KURAS ◽  
N. GUTMANIENĖ
Keyword(s):  
Nicotinic Acetylcholine Receptors ◽  
Action Potentials ◽  
Acetylcholine Receptors ◽  
Kynurenic Acid ◽  
Glutamate Release ◽  
Synaptic Potentials ◽  
Lower Vertebrates ◽  
Optic Fibers ◽  
Retinotectal Transmission

Nicotinic acetylcholine receptors are localized on retinotectal axons' terminals in lower vertebrates. The effects of activation of these receptors by endogenous acetylcholine were observed under stimulation of mass optic fibers. This study was designed to determine whether endogenous acetylcholine facilitates frog retinotectal transmission, provided only the synapses of an individual optic axon are activated, and to evaluate the feasible extent of nicotinic facilitation in these synapses by applied agonist. To this end, the effects of cholinergic drugs on the extracellular action and synaptic potentials recorded from the terminal arborization of a separate retinotectal fiber (in layer F of the tectum) were investigated in vivo. Glutamatergic nature of retinotectal synapses was reexamined by treatment with kynurenic acid. Both kynurenic acid (0.25–1 mM) and d-tubocurarine chloride (10–15 μM) significantly depressed the synaptic potentials. Carbamylcholine chloride (50–150 μM) evoked a large augmentation of the synaptic potentials and a slight but statistically significant decrease of the action potentials. D-tubocurarine reduced the effect of carbamylcholine. Pilocarpine hydrochloride (50 μM) had only a weak effect. The paired-pulse facilitation of the synaptic potentials changed significantly under the action of carbamylcholine and d-tubocurarine. The obtained results suggest that the glutamate release from activated synapses of individual retinotectal axons is facilitated by endogenous acetylcholine via presynaptic nicotinic receptors. Under used stimulation conditions, this modulation mechanism was employed only partially since its activation by applied carbamylcholine could enhance synaptic transmission up to 2.8 times.

EFFECT OF ACTINOMYCIN-D ON LABELLED MATERIAL IN THE RETINA AND OPTIC TECTUM OF GOLDFISH AFTER INTRAOCULAR INJECTION OF TRITIATED RNA PRECURSORS

1974 ◽  
Vol 23 (4) ◽  
pp. 681-687 ◽  
Author(s):  
N. A. Ingoglia ◽  
Bernice Grafstein ◽  
B. S. McEwen
Keyword(s):  
Optic Tectum ◽  
Actinomycin D ◽  
Intraocular Injection

Putative cholinergic interneurons in the optic tectum of goldfish

1986 ◽  
Vol 370 (2) ◽  
pp. 365-369 ◽  
Author(s):  
N. Tumosa ◽  
W.K. Stell ◽  
C.D. Johnson ◽  
M.L. Epstein
Keyword(s):  
Optic Tectum ◽  
Cholinergic Interneurons

The optic tectum of the dogfishScyliorhinus canicula L.: A Golgi study

1991 ◽  
Vol 307 (2) ◽  
pp. 335-349 ◽  
Author(s):  
M. Jes�s Manso ◽  
Ram�n Anadon
Keyword(s):  
Optic Tectum ◽  
Golgi Study
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