Article (Scientific journals)
Neurodegenerative and morphogenic changes in a mouse model of temporal lobe epilepsy do not depend on the expression of the calcium-binding proteins parvalbumin, calbindin, or calretinin.
Bouilleret, V.; Schwaller, B.; Schurmans, Stéphane et al.
2000In Neuroscience, 97 (1), p. 47-58
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Keywords :
mesial temporal lobe epilepsy; kainic acid; neuropeptides; GABAA-receptor; interneurons; knockout mice
Abstract :
[en] The functional role of the calcium-binding proteins parvalbumin, calretinin, and calbindin D-28k for epileptogenesis and long-term seizure-related alterations of the hippocampal formation was assessed in single- and double-knockout mice, using a kainate model of mesial temporal lobe epilepsy. The effects of a unilateral intrahippocampal injection of kainic acid were assessed at one day, 30 days, and four months post-injection, using various markers of GABAergic interneurons (GABA-transporter type 1, GABA(A)-receptor alpha1 subunit, calretinin, calbindin D-28k, somatostatin, and neuropeptide Y). Parvalbumin-deficient, parvalbumin/calbindin-deficient, and parvalbumin/calretinin-deficient mice exhibited no difference in cytoarchitecture of the hippocampal formation and in the number, distribution, or morphology of interneurons compared to wild-type mice. Likewise, mutant mice were not more vulnerable to acute kainate-induced excitotoxicity or to long-term effects of recurrent focal seizures, and exhibited the same pattern of neurochemical alterations (e.g., bilateral induction of neuropeptide Y in granule cells) and morphogenic changes (enlargement and dispersion of dentate gyrus granule cells) as wild-type animals. Quantification of interneurons revealed no significant difference in neuronal vulnerability among the genotypes.These results indicate that the calcium-binding proteins investigated here are not essential for determining the neurochemical phenotype of interneurons. Furthermore, they are not protective against kainate-induced excitotoxicity in this model, and do not appear to modulate the overall level of excitability of the hippocampus. Finally, seizure-induced changes in gene expression in granule cells, which normally express high levels of calcium-binding proteins, apparently were not affected by the gene deletions analysed
Disciplines :
Genetics & genetic processes
Biochemistry, biophysics & molecular biology
Author, co-author :
Bouilleret, V.;  INSERM Strasbourg, Cedex, France
Schwaller, B.;  University of Fribourg, Switzerland
Schurmans, Stéphane  ;  Université Libre de Bruxelles - ULB > Institut de Recherche Interdisciplinaire en Biologie Humaine et Nucléaire, Institut de Biologie et de Médecine Moléculaire
Celio, M. R.;  Institut de Recherches Interdisciplinaires en Biologie Humaine et Nucléaire, IBMM Gosselies, Belgium
Fritschy, J. M.;  University of Zurich, Zurich, Switzerland
Language :
English
Title :
Neurodegenerative and morphogenic changes in a mouse model of temporal lobe epilepsy do not depend on the expression of the calcium-binding proteins parvalbumin, calbindin, or calretinin.
Publication date :
2000
Journal title :
Neuroscience
ISSN :
0306-4522
eISSN :
1873-7544
Publisher :
Elsevier Science, New York, United States - New York
Volume :
97
Issue :
1
Pages :
47-58
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 January 2010

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