title: Inhibition of nitric oxide-induced nuclear localization of CAPON by NMDA receptor antagonist in cultured rat primary astrocytes.
abstract: Astrocytes play a key role in regulating aspects of inflammation in the central nervous system. It was observed that nNOS had located in the nucleus of cultured cerebral cortical astrocytes of 7 days. In the present study, we found that carboxy-terminal PDZ ligand of nNOS (CAPON) mainly located in the nucleus of astrocytes stimulated with NO donor sodium nitroprusside (SNP) or GSNO or N-methyl-d-aspartate (NMDA) receptor agonist-NMDA. However, originally, it was localized mostly in the cytoplasm of normal astrocytes. Immunocytochemistry showed that nNOS was co-localized with CAPON in the nucleus of astrocytes stimulated with SNP. In addition to the nuclear localization, treatment with SNP increased the mRNA and protein expression of CAPON. When SNP was removed from media, CAPON accumulated in nucleus transported back to cytoplasm. MK801, an inhibitor of NMDA receptor, was able to reverse the nuclear localization of CAPON resulted from SNP, suggesting that there is a functional relationship of NO with NMDA receptor in the regulation of the nuclear localization of CAPON. These findings provide a new insight in the understanding of the physical and pathological significances of CAPON/nNOS/NMDA receptor.
authors.affiliation: Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, Jiangsu Province 226001, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Jiang
authors.forename: Meijuan
authors.initials: M
authors.lastname: Yan
authors.forename: Qingshan
authors.initials: Q
authors.lastname: Lv
authors.forename: Chun
authors.initials: C
authors.lastname: Cheng
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Li
authors.forename: Zhiqin
authors.initials: Z
authors.lastname: Guo
authors.forename: Tao
authors.initials: T
authors.lastname: Tao
authors.forename: Aiguo
authors.initials: A
authors.lastname: Shen
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D015153:Blotting, Western; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism*; D002478:Cells, Cultured; D003470:Culture Media; D003593:Cytoplasm / Q000187:drug effects / Q000378:metabolism; D016291:Dizocilpine Maleate / Q000494:pharmacology; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D007150:Immunohistochemistry; D009569:Nitric Oxide / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D020030:Nitric Oxide Donors / Q000494:pharmacology; D009599:Nitroprusside / Q000494:pharmacology; D012313:RNA / Q000096:biosynthesis / Q000302:isolation & purification; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000819:agonists / Q000037:antagonists & inhibitors*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D003470:Culture Media; D018691:Excitatory Amino Acid Antagonists; D005904:Glial Fibrillary Acidic Protein; C488082:NOS1AP protein, rat; D020030:Nitric Oxide Donors; D016194:Receptors, N-Methyl-D-Aspartate; D009599:Nitroprusside; D009569:Nitric Oxide; D012313:RNA; D016291:Dizocilpine Maleate