title: Serum differentially modifies the transcription and translation of NMDAR subunits in retinal neurons.
abstract: The N-methyl-D-aspartate type of glutamate receptor (NMDAR) plays a major role in the vertebrate retina. Expression of NR1 splice-variants and NR2 subunits in the retina differs from that in the brain, suggesting a tissue-specific heteromeric assembly of NMDARs. We previously demonstrated that serum alters retinal glutamate receptor properties. In order to relate this effect to NMDAR subunit composition, we here studied the effect of serum on the expression of NMDAR subunits and splice-variants in chick retinal neurons in primary culture. Our results show that mRNA and protein expression of NR1 alternative splice-variants and NR2 subunits are differentially modified by glutamate contained in serum. Such alteration suggests that NMDAR structure is reversed to embryonic heteromeric composition, through the control of subunit availability. The present findings could be relevant for the understanding of the lack of effect in the retina, of drugs which have been shown to protect cortical neurons from glutamate-induced excitotoxicity in those pathological or clinical conditions in which the retina is exposed to serum.
authors.affiliation: Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Apartado Postal 70-253, Ciudad Universitaria, Mexico, DF, 04510, Mexico.
authors.forename: Irene
authors.initials: I
authors.lastname: Lee-Rivera
authors.forename: Edith
authors.initials: E
authors.lastname: López
authors.forename: J Prisco
authors.initials: JP
authors.lastname: Palma
authors.forename: Ana María
authors.initials: AM
authors.lastname: López-Colomé
mesh_terms: D000818:Animals; D002642:Chick Embryo; D018691:Excitatory Amino Acid Antagonists / Q000378:metabolism; D019833:Genistein / Q000378:metabolism; D005998:Glycine / Q000031:analogs & derivatives / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D014176:Protein Biosynthesis; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D047428:Protein Kinase Inhibitors / Q000378:metabolism; D021122:Protein Subunits / Q000235:genetics / Q000378:metabolism*; D011810:Quinoxalines / Q000378:metabolism; D020917:Receptor, trkA / Q000235:genetics / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000235:genetics / Q000378:metabolism*; D012160:Retina / Q000166:cytology* / Q000378:metabolism; D044967:Serum / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D018691:Excitatory Amino Acid Antagonists; D020033:Protein Isoforms; D047428:Protein Kinase Inhibitors; D021122:Protein Subunits; D011810:Quinoxalines; D016194:Receptors, N-Methyl-D-Aspartate; C474696:methyl-(4-carboxyphenyl)glycine; C056723:FG 9041; D019833:Genistein; D020917:Receptor, trkA; D005998:Glycine