PUBLICATION
Serotoninergic Modulation of Chloride Homeostasis during Maturation of the Locomotor Network in Zebrafish
- Authors
- Brustein, E., and Drapeau, P.
- ID
- ZDB-PUB-051121-8
- Date
- 2005
- Source
- The Journal of neuroscience : the official journal of the Society for Neuroscience 25(46): 10607-10616 (Journal)
- Registered Authors
- Brustein, Edna, Drapeau, Pierre
- Keywords
- neuromodulation, locomotion, maturation, neural network, chloride homeostasis, zebrafish
- MeSH Terms
-
- Animals
- Chlorides/antagonists & inhibitors
- Chlorides/metabolism*
- Chlorides/physiology
- Homeostasis/drug effects
- Homeostasis/physiology*
- Motor Activity/drug effects
- Motor Activity/physiology*
- Nerve Net/drug effects
- Nerve Net/embryology
- Nerve Net/physiology*
- Serotonin/physiology*
- Serotonin Agents/pharmacology
- Sodium Chloride Symporters/physiology
- Zebrafish/embryology
- Zebrafish/physiology*
- PubMed
- 16291933 Full text @ J. Neurosci.
Citation
Brustein, E., and Drapeau, P. (2005) Serotoninergic Modulation of Chloride Homeostasis during Maturation of the Locomotor Network in Zebrafish. The Journal of neuroscience : the official journal of the Society for Neuroscience. 25(46):10607-10616.
Abstract
During development, neural networks progress through important functional changes such as the generation of spontaneous activity, the expression of a depolarizing chloride gradient, and the appearance of neuromodulation. Little is known about how these processes are integrated to yield mature behaviors. We showed previously that, during the maturation of the locomotor network of the zebrafish, endogenous serotonin (5HT) increased motor activity by reducing intervals of inactivity, without affecting the active swim periods that are the target of 5HT in other and more mature preparations. Because membrane properties were constant during the rest intervals, we examined here whether 5HT modulates chloride homeostasis. We compared the effects of blocking (inward) chloride cotransport with bumetanide to the effects of 5HT and its antagonists, both behaviorally by video imaging and cellularly by whole-cell and gramicidin-perforated patch recordings. Bumetanide mimicked the effects of 5HT antagonists, by prolonging rest intervals without affecting the properties of swim episodes (duration; frequency; extent of depolarization) either behaviorally or during fictive swimming. Furthermore, bumetanide and 5HT antagonists suppressed the amplitude of depolarizing responses evoked by ionophoresis of glycine onto spinal neurons in the presence of tetrodotoxin and transiently suppressed the amplitude of responses to glycine measured after fictive swimming. The effects of bumetanide contrasted with and occluded the effects of 5HT. We suggest that, during development, endogenous 5HT modulates chloride homeostasis during the quiescent intervals and thereby offsets the long periods of quiescence commonly observed in developing networks to allow expression of sustained and behaviorally relevant activity.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping