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The Journal of Neuroscience, June 15, 1999, 19(12):4778-4785
Activation of Caspase-3 in the Retina of Transgenic Rats with the Rhodopsin Mutation S334ter during Photoreceptor Degeneration
Changdong Liu1, Yiwen Li2, Min Peng1, Alan M. Laties1, and Rong Wen1, 3 Departments of 1 Ophthalmology, 2 Neurology, and 3 Cell and Developmental Biology, University of Pennsylvania, School of Medicine, Philadelphia, Pennsylvania 19104
The role of caspase-3 in photoreceptor degeneration was examined in a line of transgenic rats that carry a rhodopsin mutation S334ter. Photoreceptor degeneration in these animals is rapid. It is detected as early as postnatal day (PD) 8, and by PD 20, only one of the original 12 rows of nuclei remain in the outer nuclear layer. At PD 11 and 12, the number of photoreceptors dying per day reaches a peak of ~30% of the total photoreceptors in the retina. Coincident with this rapid degeneration is an increase in caspase-3-like activity as assessed by the cleavage of a fluorescent substrate N-acetyl-Asp-Glu-Val-Asp-aminomethylcoumarin and an increase in activated caspase-3 as determined by Western blot analysis for its 12 kDa subunit. Intraocular injection of an irreversible caspase-3 inhibitor N-benzyloxycarbonal-Asp(OMe)-Glu(OMe)-Val-Asp(Ome)-fluoromethyketone partially protected photoreceptors from degeneration. These findings indicate that a caspase-3-dependent mechanism is operative in photoreceptor death in the transgenic rats under investigation.
Key words: caspase-3; photoreceptors; z-DEVD-fmk; rhodopsin mutation; degeneration; retina; transgenic rat
Copyright © 1999 Society for Neuroscience 0270-6474/99/19124778-08$05.00/0
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