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(Investigative Ophthalmology and Visual Science. 2004;45:2514-2521.)
© 2004 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.04-0065
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Modulating Expression of Peripherin/rds in Transgenic Mice: Critical Levels and the Effect of Overexpression

May Nour,1 Xi-Qin Ding,1 Heidi Stricker,1 Steven J. Fliesler,2,3 and Muna I. Naash1

1From the Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma; and the 2Departments of Ophthalmology and 3Pharmacological and Physiological Science, St. Louis University School of Medicine, St. Louis, Missouri.

PURPOSE. Mutations in the photoreceptor-specific protein peripherin/rds are associated with multiple retinal diseases. To date, attempts to achieve complete structural and functional rescue in animal models of peripherin/rds-induced retinal degeneration have not been successful. Gene therapy–directed approaches have been hindered by the haploinsufficiency phenotype, which dictates well-regulated expression of peripherin/rds protein levels.

METHODS.Using a transgenic mouse line expressing wild-type peripherin/rds (NMP), the authors evaluated the critical in vivo level of peripherin/rds needed to maintain photoreceptor structure and ERG function and assessed the consequences of peripherin/rds overexpression in both rods and cones by Western blot and immunoprecipitation analyses, immunohistochemistry, electron microscopy, and electroretinography. The NMP transgene included a C-terminal modification (P341Q) to facilitate detection of the transgenic protein in the presence of wild-type peripherin/rds, using the monoclonal antibody 3B6.

RESULTS.Peripherin/rds protein levels in NMP homozygotes were ~60% of wild-type levels. Western blot and immunoprecipitation analyses confirmed normal biochemical properties of the NMP protein when compared with wild-type peripherin/rds. Immunohistochemistry demonstrated appropriate localization of transgenic peripherin/rds protein to the disc rim region of photoreceptor outer segments. Total peripherin/rds levels in the retina were modulated by crossing NMP transgenic mice into different rds genetic backgrounds. A positive correlation was observed between peripherin/rds expression levels and the structural and functional integrity of photoreceptor outer segments. Overexpression of peripherin/rds caused no detectable adverse effects on rod or cone structure and function.

CONCLUSIONS.These findings may have significant implications regarding therapeutic intervention in peripherin/rds-associated retinal diseases.




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