title: The formation of argpyrimidine, a methylglyoxal-arginine adduct, in the nucleus of neural cells.
abstract: Methylglyoxal (MG) is an endogenous metabolite in glycolysis and forms stable adducts primarily with arginine residues of intracellular proteins. The biological role of this modification in cell function is not known. In the present study, we found that a MG-detoxification enzyme glyoxalase I (GLO1) is mainly expressed in the ventricular zone (VZ) at embryonic day 16 which neural stem and progenitor cells localize. Moreover, immunohistochemical analysis revealed that argpyrimidine, a major MG-arginine adduct, is predominantly produced in cortical plate neurons not VZ during cerebral cortex development and is exclusively located in the nucleus. Immunoblotting experiment showed that the formation of argpyrimidine occurs on some nuclear proteins of cortical neurons. To our knowledge, this is first report of the argpyrimidine formation in the nucleus of neuron. These findings suggest that GLO1, which is dominantly expressed in the embryonic VZ, reduces the intracellular level of MG and suppresses the formation of argpyrimidine in neural stem and progenitor cells. Argpyrimidine may contribute to the neural differentiation and/or the maintenance of the differentiated state via the modification of nuclear proteins.
authors.affiliation: Department of Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakadate
authors.forename: Koji
authors.initials: K
authors.lastname: Uchida
authors.forename: Keiji
authors.initials: K
authors.lastname: Shikata
authors.forename: Saori
authors.initials: S
authors.lastname: Yoshimura
authors.forename: Masayuki
authors.initials: M
authors.lastname: Azuma
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Hirata
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Konishi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kiyama
authors.forename: Taro
authors.initials: T
authors.lastname: Tachibana
mesh_terms: D000818:Animals; D001120:Arginine / Q000378:metabolism*; D002467:Cell Nucleus / Q000201:enzymology / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism; D018736:DNA Adducts / Q000096:biosynthesis*; D007791:Lactoylglutathione Lyase / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008813:Mice, Inbred ICR; D009474:Neurons / Q000201:enzymology / Q000378:metabolism* / Q000648:ultrastructure; D009952:Ornithine / Q000031:analogs & derivatives* / Q000096:biosynthesis; D011743:Pyrimidines / Q000096:biosynthesis*; D011765:Pyruvaldehyde / Q000378:metabolism*
chemical_list: D018736:DNA Adducts; D011743:Pyrimidines; C107313:argpyrimidine; D011765:Pyruvaldehyde; D001120:Arginine; D009952:Ornithine; D007791:Lactoylglutathione Lyase