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Sildenafil-evoked photoreceptor oxidative stress in vivo is unrelated to impaired visual performance in mice.

Authors:
Bruce A Berkowitz Robert H Podolsky Karen Lins Childers Aicha Saadane Timothy S Kern Robin Roberts Hailey Olds Joydip Joy Collin Richards Tilman Rosales Michael Schneider Brennan Schilling Arthur Orchanian Emma Graffice Kenan Sinan Haohua Qian Lamis Harp

PLoS One 2021 4;16(3):e0245161. Epub 2021 Mar 4.

Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University School of Medicine, Detroit, Michigan, United States of America.

Purpose: The phosphodiesterase inhibitor sildenafil is a promising treatment for neurodegenerative disease, but it can cause oxidative stress in photoreceptors ex vivo and degrade visual performance in humans. Here, we test the hypotheses that in wildtype mice sildenafil causes i) wide-spread photoreceptor oxidative stress in vivo that is linked with ii) impaired vision.

Methods: In dark or light-adapted C57BL/6 mice ± sildenafil treatment, the presence of oxidative stress was evaluated in retina laminae in vivo by QUEnch-assiSTed (QUEST) magnetic resonance imaging, in the subretinal space in vivo by QUEST optical coherence tomography, and in freshly excised retina by a dichlorofluorescein assay. Visual performance indices were also evaluated by QUEST optokinetic tracking.

Results: In light-adapted mice, 1 hr post-sildenafil administration, oxidative stress was most evident in the superior peripheral outer retina on both in vivo and ex vivo examinations; little evidence was noted for central retina oxidative stress in vivo and ex vivo. In dark-adapted mice 1 hr after sildenafil, no evidence for outer retina oxidative stress was found in vivo. Evidence for sildenafil-induced central retina rod cGMP accumulation was suggested as a panretinally thinner, dark-like subretinal space thickness in light-adapted mice at 1 hr but not 5 hr post-sildenafil. Cone-based visual performance was impaired by 5 hr post-sildenafil and not corrected with anti-oxidants; vision was normal at 1 hr and 24 hr post-sildenafil.

Conclusions: The sildenafil-induced spatiotemporal pattern of oxidative stress in photoreceptors dominated by rods was unrelated to impairment of cone-based visual performance in wildtype mice.

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0245161PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7932139PMC
March 2021

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