| Project/Area Number |
09671823
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Ophthalmology
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| Research Institution | Kansai Medical University |
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Principal Investigator |
TSUBURA Airo Kansai Med.Univ., Faculty of Medicine, Professor, 医学部, 教授 (90098137)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUZAWA Akio Inst.Med.Sci., Tokyo Univ., Professor, 医科学研究所, 教授 (50012745)
MIKI Hirohiko Kansai Med.Univ., Faculty of Medicine, Associate Professor, 医学部, 助教授 (30077771)
SENZAKI Hideto Kansai Med.Univ., Faculty of Medicine, Assistant Professor, 医学部, 講師 (10206659)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Retinitis pigmentosa / nitrosomethylurea / apoptosis / photoreceptor cell / retinal degeneration / pigment epithelial cell / retinal dysplasia / rosette / ニトロソ尿素 / アポトーシス / 視細胞 / 実験動物 / 色素上皮細胞 |
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| Research Abstract |
Retinal degeneration characterized by photoreceptor apoptosis was induced by a single systemic administration of N-methyl-N-nitrosourea (MNU) in a variety of adult animals : rodents (mouse, rat and hamster), insectivora (shrew ; Suncus murinus), and non-human primates (monkey ; Macaca Fuscata). Therefore, phylogenetically, MNU-induced photoreceptor apoptosis is a universal phenomenon. However, the lesions (similar to human retinitis pigmentosa) initiated from the equatorial zone in monkeys, whereas in the other species the lesions originated from the posterior pole. After the photoreceptor cell loss, an intraretinal migration of pigment epithelial cells was seen in rats and hamsters, but as in humans, the migrated pigment epithelial cells in contact with a blood vessel was seen only in the hamsters ; no pigment epithelial cell migration was seen in the mice, shrews or monkeys. Retinal dysplasia characterized by dysplastic rosettes was induced in mice treated with MNU at day 0 or 3 (the stage of retinal cell proliferation), whereas no retinal response was seen when MNU was administered at day 5 or 8 (the stage of retinal cell differentiation), and retinal degeneration occurred when MNU was administered at or over day 11 (after cellular differentiation). Thus, from the ontogenetic point of view, the MNU response was related to retinal development in that there was a critical period for the time of MNU administration for the induction of retinal lesions.
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