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Investigating protrudin’s role in neuroprotection and axon regeneration in the central nervous system


Type

Thesis

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Abstract

Protrudin — a transmembrane scaffold protein found in tubular regions of the endoplasmic reticulum (ER) — has previously been shown to strongly promote neuronal survival and axon regeneration after central nervous system (CNS) injury. This is in part due to increased levels of integrins in the distal axon, but this mechanism does not fully account for its beneficial effects. We have investigated protrudin's effects on intracellular transport, morphology, and protein localisation in neurons, and found varied but specific effects on different cellular systems. In particular, protrudin does not have any effect on the transport of late endosomes in CNS neurons — despite evidence for this mechanism in other cell types — due to the absence of key adaptor protein FYCO1 in mature neurons. It also does not have any substantial effect on dendritic spine morphology, so it does not indiscriminately promote cellular outgrowth. On the other hand, protrudin does interact with ER export and associated secretory machinery. Overexpression of an active mutant of protrudin increases the amount of an ER-Golgi intermediate compartment in axon terminals, and affects the transport of Golgi satellite organelles, which we observed even in the distal axon. Our data demonstrates that protrudin provides axons with the machinery for local membrane protein synthesis, which may play a role in neuron survival and regeneration. This work opens up new avenues for future research into adult CNS repair.

Description

Date

2023-02-02

Advisors

Eva, Richard

Keywords

axon regeneration, cell biology, gene therapy, glaucoma, neuroscience

Qualification

Doctor of Philosophy (PhD)

Awarding Institution

University of Cambridge
Sponsorship
Fight for Sight studentship