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. 2009 May 29;284(22):15173–15183. doi: 10.1074/jbc.M900322200

FIGURE 3.

FIGURE 3.

The artificial chromophore precursor, 9-cis-retinyl acetate, preserves retinal structure and function in Lrat-/-Rdh8-/-Abca4-/- mice. A, retinal histology of 6-week-old WT, Lrat-/-, and Lrat-/-Rdh8-/-Abca4-/- mice are shown (top). Cone photoreceptor degeneration is evident in the inferior retina of 6-week-old triple knock-out and Lrat-/- mice. Cone photoreceptors and photoreceptor nuclei were stained with peanut agglutinin lectin (green) and DAPI (red), respectively. B, retinoid content of mouse eyes was determined by normal phase HPLC. Lrat-/-Rdh8-/-Abca4-/- mice at the age of 6 weeks were gavaged once with 2 mg of 9-cis-retinyl acetate and kept in the dark for 3 days before analyses. Peaks corresponding to 9-cis-retinal were detected in gavaged Lrat-/-Rdh8-/-Abca4-/- mice. atRE, all-trans-retinylester; 11cRAL, 11-cis-retinal; atRAL, all-trans-retinal; atROL, all-trans-retinol; 9cRAL, 9-cis-retinal; 9cRAc, 9-cis-retinyl acetate. C, scotopic ERGs were recorded from 6-week-old Lrat-/- Rdh8-/-Abca4-/- mice. Representative ERG traces before (right) and after gavage with 2 mg of 9-cis-retinyl acetate (left) are presented. Retinal function was significantly preserved by pretreatment with 9-cis-retinyl acetate.