Excitatory amino acids in the developing brain: Ontogeny, plasticity, and excitotoxicity - 06/10/17
Abstract |
Besides their role as neurotransmitters, excitatory amino acids (EAAs) in the developing brain are crucially involved in plasticity and excitotoxicity which are modified by their distinct ontogeny. Along with incomplete neuritogenesis and synaptogenesis, presynaptic markers of the EAA system are immature in the developing brain; however, postsynaptic EAA system activities, particularly of the N-methyl-d-aspartate and quisqualate receptors, are transiently enhanced early in life. This transient enhancement is presumably beneficial to the immature brain because physiologic activation of the EAA system plays a critical role in plasticity of early learning and morphogenesis. At the same time, this transient hypersensitivity renders the immature brain vulnerable to pathologic excitation of the EAA system (excitotoxicity) as observed during neonatal hypoxia-ischemia.
Le texte complet de cet article est disponible en PDF. Supported by Research Grant NS-13515 from NINCDS and by the Research Service of the Veteran's Administration. |
Vol 6 - N° 4
P. 219-228 - juillet 1990 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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