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Ординатура / Офтальмология / Английские материалы / Retinal Degenerative Diseases Laboratory and Therapeutic Investigations_Anderson_2008.pdf
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Y. Tokita-Ishikawa et al.

53.1 Introduction

Inherited retinal degeneration or age-related macular degeneration can lead to severe ocular damage and to an extremely negative prognosis. Although many new approaches have been tried, the effectiveness of these treatments is far from satisfactory for patients. Neuronal regeneration is one of the targets for the treatment of retinal degeneration. Although the retina of warm-blooded vertebrates are believed to be incapable of neural regeneration, many authors have accumulated evidence that suggests the ability of some cells in the retina to re-enter their cell cycle, then differentiate and proliferate (Fischer et al. 2001). Neuronal differentiation is tightly regulated by various factors (Ohnuma et al. 2003). Cyclin-dependent kinases (CDKs) inhibitors have been suggested as playing an important role in neural differentiation via a cell cycle arrest-independent mechanism (Joseph et al. 2003) and p27kip1 is one of these CDK inhibitor molecules (Cunningham et al. 2001). We hypothesized that p27kip1 null (p27(–/–)) mice may show different reactions during retinal degeneration when compared to those of wild mice and that this difference will lead to some new insights for regenerative therapy for retinal degeneration.

53.2 Materials and Methods

53.2.1 Animals and Biosafety

The procedure used complied strictly with the Association for Research in Vision and Ophthalmology (ARVO) Statement for the Use of Animals in Ophthalmic and Vision Research. p27(–/–) mice were kindly provided from Keiko Nakayama (Professor, Division of Developmental Genetics, Tohoku University Graduate School of Medicine).

53.2.2 MNU-Induced Retinal Degeneration

N-methyl-N-nitrosourea (MNU; Sigma-Aldrich), a direct-acting alkylating agent, was dissolved in saline solution containing 0.05% acetic acid and was administered intraperitoneally (60 mg/kg body weight) (Nambu et al. 1997).

53.2.3 Electroretinography

A ganzfeld stimulator was used to stimulate the eyes and a data acquisition system (Universal Testing and Analysis System-Electrophysiology 3000; UTAS-E 3000: LKC Technologies, Inc., Gaithersburg, MD) was used to record the Electroretinography (ERG).