Amyloid beta accumulation and inner retinal degenerative changes in Alzheimer's disease transgenic mouse

作者：Gupta Vivek K^*; Chitranshi Nitin; Gupta Veer B; Golzan Mojtaba; Dheer Yogita; Wall Roshana Vander; Georgevsky Dana; King Anna E; Vickers James C; Chung Roger; Graham Stuart

来源：Neuroscience Letters, 2016, 623: 52-56.

DOI：10.1016/j.neulet.2016.04.059

• Amyloid beta
• Retina
• Electrophysiology recordings
• Intraocular pressure
• Aggregation

The APP-PS1 Delta E9 mouse model of Alzheimer's disease (AD) exhibits age dependent amyloid beta (A(beta) plaque formation in their central nervous system due to high expression of mutated human APP and PSEN1 trans genes. Here we evaluated A beta deposition and changes in soluble A beta accumulation in the retinas of aged APP-PS1 mice using a combination of immunofluorescence, retinal flat mounts and western blotting techniques. A beta accumulation in the retina has previously been shown to be associated with retinal ganglion cell apoptosis in animal models of glaucoma. This study investigated changes in the inner retinal function and structure in APP-PSI mice using electrophysiology and histological approaches respectively. We report for the first time a significant decline in scotopic threshold response (STR) amplitudes which represents inner retinal function in transgenic animals compared to the wild type counterparts (p < 0.0001). Thinning of the retina particularly involving inner retinal layers and reduction in axonal density in the optic nerve was also observed. TUNEL staining was performed to examine neuronal apoptosis in the inner retina. Intraocular pressure (IOP) measurements showed that APP-PS1 Delta E9 mice had a slightly elevated IOP, but the significance of this finding is not yet known. Together, these results substantiate previous observations and highlight that APP-PS1 Delta E9 mice show evidence of molecular, functional and morphological degenerative changes in the inner retina.

• 出版日期2016-6-3