Neuronal Nitric Oxide Synthase Is Crucial for Ganglion Cell Death in Rat Retinal Explant Cultures

  • Katsuki Hiroshi
    Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University
  • Yamamoto Rie
    Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University
  • Nakata Daisuke
    Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University
  • Kume Toshiaki
    Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University
  • Akaike Akinori
    Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University

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Abstract

We examined possible involvement of nitric oxide synthase (NOS) on ganglion cell death in explant cultures of neonatal rat retina. Survival of retinal ganglion cells was significantly prolonged by a broad-spectrum NOS inhibitor Nω-nitro-<sc>L</sc>-arginine methylester. NADPH diaphorase staining revealed a diffused distribution of NOS activity in neuropils of the inner plexiform layer as well as several neurons in the inner nuclear layer. Moreover, 7-nitroindazole but not aminoguanidine promoted the survival of retinal ganglion cells. These results suggest a crucial role of neuronal NOS-derived nitric oxide in retinal ganglion cell death.<br>

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