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Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...

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Analyzing the Parkinson's Disease Mouse Model Induced by Adeno-associated Viral Vectors Encoding Human α-Synuclein

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Knockout of Rab27b exacerbates neuropathology in alpha-synuclein mouse models.

Kasandra Scholz¹, Mary A Gannon¹, Lehmann Matheny¹

¹Department of Neurology, Killion Center for Neurodegeneration and Experimental Therapeutics, Civitan International Research Center, University of Alabama at Birmingham, 510A, 1719 6th Avenue South, Birmingham, AL, 35294, USA.

Acta Neuropathologica Communications

|May 12, 2026

Summary

Loss of Rab27b protein exacerbates alpha-synuclein pathology in Parkinson's disease models. This suggests Rab27b is a potential therapeutic target for synucleinopathies.

Keywords:

A53T alpha-synuclein mutation Alpha-synuclein Dementia with lewy bodies Parkinson’s disease Rab27b

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Area of Science:

Neuroscience
Cell Biology
Genetics

Background:

Parkinson's disease (PD) and synucleinopathies involve alpha-synuclein (αsyn) aggregates.
The small GTPase Rab27b regulates lysosomal function and αsyn degradation.
Rab27b levels are elevated in human synucleinopathies, suggesting a compensatory role.

Purpose of the Study:

To investigate the in vivo role of Rab27b in Parkinson's disease models.
To determine if Rab27b deficiency impacts αsyn pathology and neurodegeneration.

Main Methods:

Utilized A53T genetic αsyn overexpression and adeno-associated virus (AAV) αsyn overexpression mouse models.
Generated Rab27b knockout (KO) and wild-type (WT) littermate controls.
Assessed motor behavior, survival, αsyn levels (total, phosphorylated, proteinase-K resistant), dopaminergic neuron loss, and glial activation.

Main Results:

Rab27b KO in A53T mice increased proteinase-K resistant and phosphorylated αsyn in brain regions relevant to PD.
Rab27b KO led to astrocyte and microglial activation in the A53T model.
Rab27b KO in the AAV αsyn model caused significant dopaminergic neuron loss in the substantia nigra.

Conclusions:

Loss of Rab27b function exacerbates αsyn neuropathology and neuroinflammation in vivo.
Rab27b deficiency leads to dopaminergic neurodegeneration in an αsyn overexpression model.
Rab27b is a critical regulator of αsyn pathology and a potential therapeutic target for synucleinopathies.