Effects of Chloride accumulation and diffusion on GABAergic transmission (Jedlicka et al 2011)

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Accession:148253
"In the CNS, prolonged activation of GABA(A) receptors (GABA(A)Rs) has been shown to evoke biphasic postsynaptic responses, consisting of an initial hyperpolarization followed by a depolarization. A potential mechanism underlying the depolarization is an acute chloride (Cl(-)) accumulation resulting in a shift of the GABA(A) reversal potential (E(GABA)). The amount of GABA-evoked Cl(-) accumulation and accompanying depolarization depends on presynaptic and postsynaptic properties of GABAergic transmission, as well as on cellular morphology and regulation of Cl(-) intracellular concentration ([Cl(-)](i)). To analyze the influence of these factors on the Cl(-) and voltage behavior, we studied spatiotemporal dynamics of activity-dependent [Cl(-)](i) changes in multicompartmental models of hippocampal cells based on realistic morphological data. ..."
Reference:
1 . Jedlicka P, Deller T, Gutkin BS, Backus KH (2011) Activity-dependent intracellular chloride accumulation and diffusion controls GABA(A) receptor-mediated synaptic transmission. Hippocampus 21:885-98 [PubMed]
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Model Information (Click on a link to find other models with that property)
Model Type: Neuron or other electrically excitable cell; Extracellular;
Brain Region(s)/Organism:
Cell Type(s): Dentate gyrus granule GLU cell;
Channel(s): I Chloride; I_HCO3;
Gap Junctions:
Receptor(s): GabaA;
Gene(s):
Transmitter(s): Gaba;
Simulation Environment: NEURON;
Model Concept(s): Influence of Dendritic Geometry; Short-term Synaptic Plasticity; Chloride regulation;
Implementer(s): Jedlicka, Peter [jedlicka at em.uni-frankfurt.de]; Mohapatra, Namrata [mohapatra at em.uni-frankfurt.de];
Search NeuronDB for information about:  Dentate gyrus granule GLU cell; GabaA; I Chloride; I_HCO3; Gaba; 
COMMENT
	Introduces a spine area scale factor as a range variable.
	This doesn't do magic: it will NOT automatically correct
	for spines. You will still have to multiply surface-dependent
	variables (capacitance, conductances) with scale_spines.
	Copied from 
	http://www.northwestern.edu/neurobiology/faculty/spruston/sk_models/JP_2005/Attenuation.zip
	last retrieved 02-2007
	Golding NL, Mickus TJ, Katz Y, Kath WL, Spruston N (2005)
	Factors mediating powerful voltage attenuation along CA1 
	pyramidal neuron dendrites. J Physiol (Lond) 568:69-82.

	2007-05-15, CSH, University of Freiburg 
ENDCOMMENT

NEURON {
	SUFFIX spines
	RANGE scale, count
}

PARAMETER {
	scale = 1
	count = 0
}