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Decreased levels of pNR1 S897 protein in the cortex of neonatal Sprague Dawley rats with hypoxic-ischemic or NMDA-induced brain damage
Hei, Ming-Yan; Tao, Hui-Kang; Tang, Qin; Yu, Bo; Zhao, Ling-Ling.
  • Hei, Ming-Yan; Central South University. The Third Xiangya Hospital. Department of Pediatrics. Changsha. CN
  • Tao, Hui-Kang; Central South University. The Third Xiangya Hospital. Department of Pediatrics. Changsha. CN
  • Tang, Qin; Central South University. The Third Xiangya Hospital. Department of Pediatrics. Changsha. CN
  • Yu, Bo; Central South University. The Third Xiangya Hospital. Department of Pediatrics. Changsha. CN
  • Zhao, Ling-Ling; Central South University. The Third Xiangya Hospital. Department of Pediatrics. Changsha. CN
Braz. j. med. biol. res ; 45(10): 962-967, Oct. 2012. ilus
Article in English | LILACS | ID: lil-647754
ABSTRACT
Our objective was to investigate the protein level of phosphorylated N-methyl-D-aspartate (NMDA) receptor-1 at serine 897 (pNR1 S897) in both NMDA-induced brain damage and hypoxic-ischemic brain damage (HIBD), and to obtain further evidence that HIBD in the cortex is related to NMDA toxicity due to a change of the pNR1 S897 protein level. At postnatal day 7, male and female Sprague Dawley rats (13.12 ± 0.34 g) were randomly divided into normal control, phosphate-buffered saline (PBS) cerebral microinjection, HIBD, and NMDA cerebral microinjection groups. Immunofluorescence and Western blot (N = 10 rats per group) were used to examine the protein level of pNR1 S897. Immunofluorescence showed that control and PBS groups exhibited significant neuronal cytoplasmic staining for pNR1 S897 in the cortex. Both HIBD and NMDA-induced brain damage markedly decreased pNR1 S897 staining in the ipsilateral cortex, but not in the contralateral cortex. Western blot analysis showed that at 2 and 24 h after HIBD, the protein level of pNR1 S897 was not affected in the contralateral cortex (P > 0.05), whereas it was reduced in the ipsilateral cortex (P < 0.05). At 2 h after NMDA injection, the protein level of pNR1 S897 in the contralateral cortex was also not affected (P > 0.05). The levels in the ipsilateral cortex were decreased, but the change was not significant (P > 0.05). The similar reduction in the protein level of pNR1 S897 following both HIBD and NMDA-induced brain damage suggests that HIBD is to some extent related to NMDA toxicity possibly through NR1 phosphorylation of serine 897.
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Full text: Available Index: LILACS (Americas) Main subject: Cerebral Cortex / Receptors, N-Methyl-D-Aspartate / Hypoxia-Ischemia, Brain Type of study: Etiology study Limits: Animals Language: English Journal: Braz. j. med. biol. res Journal subject: Biology / Medicine Year: 2012 Type: Article Affiliation country: China Institution/Affiliation country: Central South University/CN

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Full text: Available Index: LILACS (Americas) Main subject: Cerebral Cortex / Receptors, N-Methyl-D-Aspartate / Hypoxia-Ischemia, Brain Type of study: Etiology study Limits: Animals Language: English Journal: Braz. j. med. biol. res Journal subject: Biology / Medicine Year: 2012 Type: Article Affiliation country: China Institution/Affiliation country: Central South University/CN