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Progressive dopaminergic alterations and mitochondrial abnormalities in LRRK2 G2019S knock-in mice.

Abstract：

:Mutations in the LRRK2 gene represent the most common genetic cause of late onset Parkinson's disease. The physiological and pathological roles of LRRK2 are yet to be fully determined but evidence points towards LRRK2 mutations causing a gain in kinase function, impacting on neuronal maintenance, vesicular dynamics and neurotransmitter release. To explore the role of physiological levels of mutant LRRK2, we created knock-in (KI) mice harboring the most common LRRK2 mutation G2019S in their own genome. We have performed comprehensive dopaminergic, behavioral and neuropathological analyses in this model up to 24months of age. We find elevated kinase activity in the brain of both heterozygous and homozygous mice. Although normal at 6months, by 12months of age, basal and pharmacologically induced extracellular release of dopamine is impaired in both heterozygous and homozygous mice, corroborating previous findings in transgenic models over-expressing mutant LRRK2. Via in vivo microdialysis measurement of basal and drug-evoked extracellular release of dopamine and its metabolites, our findings indicate that exocytotic release from the vesicular pool is impaired. Furthermore, profound mitochondrial abnormalities are evident in the striatum of older homozygous G2019S KI mice, which are consistent with mitochondrial fission arrest. We anticipate that this G2019S mouse line will be a useful pre-clinical model for further evaluation of early mechanistic events in LRRK2 pathogenesis and for second-hit approaches to model disease progression.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Yue M,Hinkle KM,Davies P,Trushina E,Fiesel FC,Christenson TA,Schroeder AS,Zhang L,Bowles E,Behrouz B,Lincoln SJ,Beevers JE,Milnerwood AJ,Kurti A,McLean PJ,Fryer JD,Springer W,Dickson DW,Farrer MJ,Melrose HL

doi

10.1016/j.nbd.2015.02.031

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

172-95

eissn

0969-9961

issn

1095-953X

pii

S0969-9961(15)00099-6

journal_volume

78

pub_type

杂志文章

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