Retinal degeneration induced by N-methyl-N-nitrosourea in Syrian golden hamsters.
BACKGROUND
The sequential retinal changes in Syrian golden hamsters induced 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 electron 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) Photoreceptor apoptosis occurred 1 day after the treatment and resulted in photoreceptor loss at day 7. During the degeneration, Müller cell proliferation was conspicuous at day 5. (2) After the photoreceptor cell loss, migration of the pigment epithelial cells in all layers of the retina which were in contact with blood vessels occurred. Due to the Müller cell proliferation, gliosis was prominent at the later stage.


CONCLUSIONS
The MNU injection caused photoreceptor apoptosis followed by pigment epithelial cell migration around the blood vessels, accompanied by gliosis. The primary event and the course of this disease closely resemble those of retinitis pigmentosa in humans.
Department of Pathology, Kansai Medical University, Moriguchi, Osaka, Japan.
M
M
Taomoto
H
H
Nambu
H
H
Senzaki
N
N
Shikata
Y
Y
Oishi
T
T
Fujii
H
H
Miki
M
M
Uyama
A
A
Tsubura
D000818:Animals; D017209:Apoptosis; D002452:Cell Count; D002465:Cell Movement; D006224:Cricetinae; D005260:Female; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D006801:Humans; D007124:Immunoenzyme Techniques; D020287:In Situ Nick-End Labeling; D007274:Injections, Intraperitoneal; D008647:Mesocricetus; D008770:Methylnitrosourea / Q000633:toxicity*; D020419:Photoreceptor Cells, Vertebrate / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure*; D010857:Pigment Epithelium of Eye / Q000473:pathology; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D012162:Retinal Degeneration / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology*; D012174:Retinitis Pigmentosa / Q000473:pathology; D014746:Vimentin / Q000378:metabolism
D005904:Glial Fibrillary Acidic Protein; D018809:Proliferating Cell Nuclear Antigen; D014746:Vimentin; D008770:Methylnitrosourea