Understanding the Role of Novel Endocytic Proteins in Alzheimer's Disease Pathogenesis

Virginie Buggia-Prevot, PhD
University of Chicago (Chicago, IL)


Gopal Thinakaran, PhD
University of Chicago (Chicago, IL)
Year Awarded:
Grant Duration:
July 1, 2014 to January 31, 2017
Alzheimer's Disease
Award Amount:
Grant Reference ID:
Award Type:
Postdoctoral Fellowship
Award Region:
US Midwestern

This grant is made possible by a bequest from the Herbert Howlett Trust, in his memory.

Virginie Buggia-Prevot, PhD

Role of EHD Proteins in Alzheimer's Disease Pathogenesis


The goal of my research is to better understand the causes of Alzheimer’s disease by studying the mechanisms that contribute to the underlying pathology of the disease, in order to identify potential therapeutic targets. In the brain of individuals with Alzheimer’s disease, a toxic peptide called amyloid is overproduced and leads to dysfunction of memory functions and ultimately the death of the nerve cells. I recently found two proteins in a family called EHD (eps15 homology domain-containing proteins), which are involved in amyloid peptide production in cultured neurons. Our investigation will determine if there is an alteration of EHD in human brains that could facilitate amyloid overproduction, and will test whether amyloid overproduction could be blocked by abolishing the expression of EHD in mice that are engineered to develop Alzheimer’s disease pathology. Thus, our proposal is aimed at investigating neuronal mechanisms that are intimately associated with Alzheimer's disease with the goal of establishing EHD proteins as one of the molecular players in disease pathogenesis.


The goal of my research is to better understand the causes of Alzheimer’s disease by studying the mechanisms that contribute to the disease appearance, and thus identify potential therapeutic targets. More specifically, I am investigating the contribution to AD of endosomal proteins, which I recently identified as a modulator of amyloid-beta generation and protein transport in neurons.

In the brain of individuals with AD, a toxic peptide called amyloid is overproduced and leads to memory dysfunction and ultimately death of the nerve cells. In addition to amyloid deposition, abnormalities of endosomes are found in the brain of patients affected by AD. Endosomes are cellular components important for the regulation of proteins recycling and degradation. My recent findings established a link between the regulation of endosomal transport and amyloid peptide generation in neurons cultured in vitro. Understanding how the amyloid peptide is generated in the brain is of major interest to develop strategies aimed at decreasing amyloid levels. I am using genetically engineered mice as well as high-resolution microscopy and biochemistry techniques to address the importance of endosomal proteins in the development of AD. I am also investigating in more detail certain aberrations of endosomal proteins during the development of the disease pathology in mouse models of AD and in the human brain. Thus, my research goal is to establish the contribution of endosomal proteins as molecular players in the development of AD.

This project is innovative because it is based on my novel findings identifying endosomal proteins as regulators of both amyloid peptide levels and the transport of the enzyme responsible for its generation. The involvement of these proteins in the development of AD had never been investigated, thus my research should yield significant new information on the relationship between endosomal proteins and the disease.

There is no cure available for Alzheimer’s disease, and in order to develop one, it is then essential to understand better the disease pathology. The completion of this study will provide key information on the neuronal mechanisms intimately associated with AD pathology. In the future, my research could lead to the design of a new therapeutic strategy targeting the neuronal transport of proteins to decrease amyloid peptide.

About the Researcher

Virginie Buggia-Prévot is a postdoctoral research scholar in the Department of Neurobiology at the University of Chicago. She complete her doctoral studies on cell and molecular biology at the University of Nice-Sophia Antipolis (France), where she found that the amyloid-beta peptide feeds its own production when its reaches abnormal concentrations, by increasing the transcription of BACE1, the enzyme responsible for amyloid peptide generation. She then joined Prof. Gopal Thinkaran’s team five years ago to pursue her work on Alzheimer’s disease, by studying the mechanism involved in the regulation of BACE1 transport in neurons by live-cell imaging. Her recent work identified three new regulators of BACE1 trafficking, which also affect amyloid production in neurons. The discovery of such regulators could lead to novel targets and strategies for Alzheimer’s therapeutics.


Buggia-Prévot V, Thinakaran G. Significance of transcytosis in Alzheimer's disease: BACE1 takes the scenic route to axons. Bioessays. 2015 Jun 30. doi: 10.1002/bies.201500019. [Epub ahead of print] PubMed PMID: 26126792. PubMed Icon Google Scholar Icon

Sadleir KR, Kandalepas PC, Buggia-Prévot V, Nicholson DA, Thinakaran G2, Vassar R. Acta Neuropathol. 2016 Mar 18. Presynaptic dystrophic neurites surrounding amyloid plaques are sites of microtubule disruption, BACE1 elevation, and increased Aβ generation in Alzheimer's disease. [Epub ahead of print] PubMed Icon Google Scholar Icon

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