The Amyloid Precursor Protein Plays Differential Roles in the UVA
Resistance and Proliferation of Human Retinal Pigment Epithelial Cells

Fatima      Sultan; Edward   T.   Parkin

doi:10.2174/0929866529666220217124152

Abstract

Background: Age-related macular degeneration (AMD) can be characterised by degeneration of retinal pigment epithelial (RPE) cells and the accumulation, in retinal drusen deposits, of amyloid beta-peptides proteolytically derived, by secretases, from the amyloid precursor protein (APP). Ultraviolet (UV) light exposure is a risk factor for the development of AMD.

Objectives: In the current study, we investigated whether APP and/or its proteolysis are linked to the UVA resistance or proliferation of ARPE-19 human RPE cells.

Methods: Cell viability was determined, following UVA exposure, with prior small interfering RNA-mediated APP depletion or secretase inhibitor treatments. APP levels/proteolysis were analysed by immunoblotting. Cells were also grown in the presence/absence of secretase inhibitors to assess their effects on longer-term culture growth. Finally, the effects of APP proteolytic fragments on ARPE-19 cell proliferation were monitored following co-culture with human embryonic kidney cells stably over-expressing these fragments.

Results: Endogenous APP was depleted following UVA irradiation and β-secretase, but not α- secretase, the processing of the protein was reduced. Experimental APP depletion or γ-secretase (but not α- or β-secretase) inhibition ablated the detrimental effect of UVA on cell viability. In contrast, α-secretase, and possibly γ-secretase but not β-secretase activity, appeared to promote the longerterm proliferation of ARPE-19 cells in the absence of UVA irradiation.

Conclusion: There are clear but differential links between APP expression/proteolysis and the proliferation and UVA resistance of ARPE-19 cells indicating that the protein should be investigated further in relation to the identification of possible drug targets for the treatment of AMD.

Keywords: Amyloid precursor protein, ultraviolet, resistance, proliferation, retinal, pigment, epithelial.

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DOI https://dx.doi.org/10.2174/0929866529666220217124152	Print ISSN 0929-8665
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The Amyloid Precursor Protein Plays Differential Roles in the UVA Resistance and Proliferation of Human Retinal Pigment Epithelial Cells

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