RETINAL DEGENERATION INDUCED BY N-METHYL-N-NITROSOUREA IN SYRIAN GOLDEN-HAMSTERS

Background: The sequential retinal changes in Syrian golden hamsters i nduced by N-methyl-N-nitrosourea (MNU) have not been studied. Methods: Female hamsters received a single intraperitoneal injection of 90 mg/ kg MNU at 50 days of age, and the retina was examined light and electr on microscopically, immunohistochemically and by the TdT-mediated dUTP -digoxigenin nick end labeling (TUNEL) method until 20 weeks after the treatment. Results: The retinal changes were as follows: (1) Photorec eptor apoptosis occurred 1 day after the treatment and resulted in pho toreceptor loss at day 7. During the degeneration, Muller cell prolife ration was conspicuous at day 5. (2) After the photoreceptor cell loss , migration of the pigment epithelial cells in all layers of the retin a which were in contact with blood vessels occurred. Due to the Muller cell proliferation, gliosis was prominent at the later stage. Conclus ions: The MNU injection caused photoreceptor apoptosis followed by pig ment epithelial cell migration around the blood vessels, accompanied b y gliosis. The primary event and the course of this disease closely re semble those of retinitis pigmentosa in humans.