Repository logo
 

Mutations in LRRK2 linked to Parkinson disease sequester Rab8a to damaged lysosomes and regulate transferrin-mediated iron uptake in microglia.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Kluss, Jillian H 
Langston, Rebekah G  ORCID logo  https://orcid.org/0000-0003-0123-7934

Abstract

Mutations in leucine-rich repeat kinase 2 (LRRK2) cause autosomal dominant Parkinson disease (PD), while polymorphic LRRK2 variants are associated with sporadic PD. PD-linked mutations increase LRRK2 kinase activity and induce neurotoxicity in vitro and in vivo. The small GTPase Rab8a is a LRRK2 kinase substrate and is involved in receptor-mediated recycling and endocytic trafficking of transferrin, but the effect of PD-linked LRRK2 mutations on the function of Rab8a is poorly understood. Here, we show that gain-of-function mutations in LRRK2 induce sequestration of endogenous Rab8a to lysosomes in overexpression cell models, while pharmacological inhibition of LRRK2 kinase activity reverses this phenotype. Furthermore, we show that LRRK2 mutations drive association of endocytosed transferrin with Rab8a-positive lysosomes. LRRK2 has been nominated as an integral part of cellular responses downstream of proinflammatory signals and is activated in microglia in postmortem PD tissue. Here, we show that iPSC-derived microglia from patients carrying the most common LRRK2 mutation, G2019S, mistraffic transferrin to lysosomes proximal to the nucleus in proinflammatory conditions. Furthermore, G2019S knock-in mice show a significant increase in iron deposition in microglia following intrastriatal LPS injection compared to wild-type mice, accompanied by striatal accumulation of ferritin. Our data support a role of LRRK2 in modulating iron uptake and storage in response to proinflammatory stimuli in microglia.

Description

Keywords

Aged, Animals, Biological Transport, Corpus Striatum, Gain of Function Mutation, HEK293 Cells, Humans, Iron, Leucine-Rich Repeat Serine-Threonine Protein Kinase-2, Lysosomes, Male, Mice, Mice, Inbred C57BL, Microglia, Middle Aged, Mutation, Parkinson Disease, Protein Serine-Threonine Kinases, Transferrin, Transferrins, rab GTP-Binding Proteins

Journal Title

PLoS Biol

Conference Name

Journal ISSN

1544-9173
1545-7885

Volume Title

19

Publisher

Public Library of Science (PLoS)
Sponsorship
NINDS NIH HHS (R01 NS110188)
Intramural NIH HHS (ZIA AG000948)