Abstract:
:Macular degeneration is hallmarked by retinal accumulation of toxic retinoid species (e.g., A2E) for which there is no endogenous mechanism to eliminate it. This ultimately results in progressive dysfunction and loss of vision either in advanced age for genetically normal patients (age-related macular degeneration) or in adolescence for those with inherited genetic mutations (Stargardt's disease). In this article, we present a proof-of-concept study for an enzyme-based therapy to remove these retinoids, modeled on traditional enzyme replacement therapy. Recombinant manganese peroxidase (rMnP) is produced in Pichia pastoris. In vitro, we demonstrate that rMnP breaks down A2E and other lipofuscin fluorophores with limited cellular toxicity, and as this enzyme is mannosylated, it can be taken up into cells through mannose receptor-dependent endocytosis. In vivo, we demonstrate that rMnP can significantly reduce the A2E burden when administered by intravitreal injections. Together, these data provide encouraging results toward the development of an enzyme-based therapy for macular degeneration and indicate the need for additional work to characterize the molecular mechanism of A2E breakdown and to improve the pharmacological parameters of the enzyme.
journal_name
Rejuvenation Resjournal_title
Rejuvenation researchauthors
Moody KJ,Tinklepaugh J,Obert E,Grohn K,DeRosa JR,Lumen E,Moyer BS,Campbell S,Wolfe AJ,Sleeper MB,Bianchi AH,Fisher C,Applegate J,Leary E,LeClair N,Wortel D,Doyle RP,Rohrer B,Blanden ARdoi
10.1089/rej.2018.2146subject
Has Abstractpub_date
2018-12-01 00:00:00pages
560-571issue
6eissn
1549-1684issn
1557-8577journal_volume
21pub_type
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