Abstract:
:Currently, no pharmacotherapy has been proven effective in treating photoreceptor degeneration in patients. Discovering readily available and safe neuroprotectants is therefore highly sought after. Here, we investigated nicotinamide mononucleotide (NMN), a precursor of nicotinamide adenine dinucleotide (NAD+), in a retinal detachment (RD) induced photoreceptor degeneration. NMN administration after RD resulted in a significant reduction of TUNEL+ photoreceptors, CD11b+ macrophages, and GFAP labeled glial activation; a normalization of protein carbonyl content (PCC), and a preservation of the outer nuclear layer (ONL) thickness. NMN administration significantly increased NAD+ levels, SIRT1 protein expression, and heme oxygenase-1 (HO-1) expression. Delayed NMN administration still exerted protective effects after RD. Mechanistic in vitro studies using 661W cells revealed a SIRT1/HO-1 signaling as a downstream effector of NMN-mediated protection under oxidative stress and LPS stimulation. In conclusion, NMN administration exerts neuroprotective effects on photoreceptors after RD and oxidative injury, suggesting a therapeutic avenue to treating photoreceptor degeneration.
journal_name
Aging (Albany NY)journal_title
Agingauthors
Chen X,Amorim JA,Moustafa GA,Lee JJ,Yu Z,Ishihara K,Iesato Y,Barbisan P,Ueta T,Togka KA,Lu L,Sinclair DA,Vavvas DGdoi
10.18632/aging.202453subject
Has Abstractpub_date
2020-12-29 00:00:00pages
24504-24521issue
24issn
1945-4589pii
202453journal_volume
12pub_type
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