期刊
NUTRIENTS
卷 12, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/nu12071910
关键词
adaptation; retinal ganglion cell; pattern electroretinogram; nicotinamide; mitochondria
资金
- National Institute of Health [RO1 EY019077]
- Research to Prevent Blindness Unrestricted Grant
- National Institute of Health Center Core Grant [P30EY014801]
Flickering light increases metabolic demand in the inner retina. Flicker may exacerbate defective mitochondrial function in glaucoma, which will be reflected in the pattern electroretinogram (PERG), a sensitive test of retinal ganglion cell (RGC) function. We tested whether flicker altered the PERG of DBA/2J (D2) glaucomatous mice and whether vitamin B3-rich diet contributed to the flicker effect. D2 mice fed with either standard chow (control,n= 10) or chow/water enriched with nicotinamide (NAM, 2000 mg/kg per day) (treated,n= 10) were monitored from 3 to 12 months. The PERG was recorded with superimposed flicker (F-PERG) at either 101 Hz (baseline) or 11 Hz (test), and baseline-test amplitude difference (adaptation) evaluated. At endpoint, flat-mounted retinas were immunostained (RBPMS and mito-tracker). F-PERG adaptation was 41% in 3-month-old D2 and decreased with age more in control D2 than in NAM-fed D2 (GEE,p< 0.01). At the endpoint, F-PERG adaptation was 0% in control D2 and 17.5% in NAM-fed D2, together with higher RGC density (2.4x), larger RGC soma size (2x), and greater intensity of mitochondrial staining (3.75x). F-PERG adaptation may provide a non-invasive tool to assess RGC autoregulation in response to increased metabolic demand and test the effect of dietary/pharmacological treatments on optic nerve disorders.
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