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Ординатура / Офтальмология / Английские материалы / Retinal Degenerative Diseases Laboratory and Therapeutic Investigations_Anderson_2008.pdf
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M. Kaneda et al.

lesion. The second period is an axonal elongation period within 1–5 weeks after nerve lesion. The third period is a synaptic connection and refinement in the tectum within 1.5–4 months after nerve lesion. The fourth period is a recovery period of visual function within 5–6 months after nerve lesion.

In previous studies, many factors or substances involved in the axonal elongation process were identified (Ballestero et al. 1997; Liu et al. 2002; Sugitani et al. 2006). However, there are few studies as for the molecules involved in the processes of the first and third period mentioned above. There is nothing to involve in the whole periods of long optic never regeneration process in fish.

In the present study, we want to know a regeneration-associated molecule which involves in the whole period of optic nerve regeneration in goldfish. If we can find such a molecule, we can easily decide the start and end points of optic nerve regeneration. In a previous paper, we described the fast and slow phases of goldfish behavior during optic nerve regeneration after nerve lesion (Kato et al. 1999). In this study, we investigated two-point distance of pair of goldfish with bilaterally axotomized optic nerve. The visual-guided behavior could recover more than 4 months after nerve lesion. In this view point, we checked biochemical expressions in the goldfish retina for over 4 months. As a candidate molecule, we focused on growthassociated protein43 (GAP43), because it is a famous marker protein of growing axons in development and regeneration (Benowitz and Routenberg 1997). It is also well known that the localization of GAP43 is at the growth cone and presynaptic terminals (Benowitz and Routenberg 1997). The location of GAP43 at the growth cone is used to be a biochemical marker for growing axons. However, the location of GAP43 at the presynaptic terminals has been entirely neglected. The presynaptic terminals of goldfish visual regeneration system are the just site in which synaptic refinement of regrowing optic axons occurs in the tectum. Therefore, we investigate the expression of GAP43 mRNA and protein in the goldfish retina for over 4 months after optic nerve lesion.

12.2 Experimental Procedures

12.2.1 Animal

Goldfish (Carassius auratus) was used throughout the experiment. Goldfish after optic nerve transection were reared in a water tank at 22 ± 1C with 12/12 h light and dark cycle. The eye was enucleated at appropriate time points under anesthesia.

12.2.2 Immunohistochemistry

The retina was isolated and fixed with 4% paraformaldehyde solution containing 0.1 M phosphate buffer (pH7.4) and 5% sucrose. The thin sections of the retina in 12 μm thickness were reacted with primary anti-GAP43 antibody (1:300) and