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Personal profile

Research interests

My research interests lie in two key areas in neurological diseases such as Motor Neuron Disease (MND), firstly the development of biomarkers, and secondly, the role of toxins in neurotoxicity and disease development. 

I spearhead two projects investigating candidate biomarkers for MND using the Kynurenine Pathway, and other inflammatory, and known biomarkers for MND. 

My project investigating neurotoxicity of algal neurotoxins focus on understanding the effect of these toxins on cellular dysfunction, but also if and how, these toxins can contribute to disease development before cellular death occurs. 

The next stages of my projects will be focused on (1) biostatistical analyses of the biomarkers to tease out sensitive and specific biomarkers that can be applied clinically; and (2) to elucidate the roles of neurotoxins in disease development. 

Research student supervision

Current Projects (Selected projects)

Project 1

The algal neurotoxin, β-Methylamino-L-alanine (BMAA) is associated with MND, and has been shown to enter brain cells. Its neurotoxic properties are well known, however, its effects on subcellular compartments of neurons are unclear. Using microfluidic chambers, we have previously shown that somatic exposure of BMAA causes more axonal degeneration than somatic death, indicating that BMAA may affect the peripheral nervous system stronger. We aim to determine the effect of axonal exposure of low concentrations BMAA on axonal degeneration and somatic death.


Expected outcomes:
(1) Determine if axonal BMAA exposure results in more axonal degeneration
(2) Show the retrograde transmission of BMAA within and between cells


Key techniques:
Cell culture, immunocytochemistry, microscopy

 

 

Project 2

The algal neurotoxin, β-Methylamino-L-alanine (BMAA) is associated with MND, and has been shown to enter brain cells, be transported within the cell, and transmitted between neural cells. We aim to show the spread of BMAA in neurons by synthesizing a fluorescently labelled BMAA (FL-BMAA) to allow examination of the real time tracking of BMAA.

The synthesis of a FL-BMAA allow live visualization of BMAA in vitro, and build hypotheses and lay groundwork to develop therapeutic methods to disrupt BMAA uptake and transmission to block or slow disease. It will also provide preliminary evidence to support our overarching hypothesis for BMAA entering the central nervous system (CNS) that BMAA can spread in a retrograde manner.


Expected outcomes
(1) Novel synthesis of FL-BMAA
(2) Observe the uptake of BMAA into neuronal cells, transport within and between neuronal cells
(3) Preliminary evidence of BMAA uptake, transport, and transmission in neurons

Key techniques
Cell culture, microscopy, 

 

Project 3

There is a pressing need for biomarkers in MND, not only to independently determine the progression of the disease, but also to delineate the different subtypes of the disease, and provide a prognosis. These biomarkers are not only informative to the patients and their families, but also hold great clinical significance for the scientific and clinical research community in developing better research by having targeted research and treatments for the various subtypes in the clinical spectrum. More than 90 neuroinflammation and disease associated biomarkers on longitudinal patient and control samples are being assessed.

Expected outcomes

(1) Longitudinal information on changes in neuroinflammation within patients with MND

(2) Development of biomarkers that can be used to confirm diagnosis, and as progression and prognostic biomarkers.

Key techniques

Elisa, data management, biostatistical analyses

 

 

Project 4

The algal neurotoxin, β-Methylamino-L-alanine (BMAA) is associated with MND, and has been shown to enter brain cells. There is preliminary evidence that BMAA is bound in proteins and may cause protein misfolding and aberrations. This project elucidates the protein binding and misfolding properties of BMAA in MND proteins through the observation of BMAA integration or association with MND related proteins, in cell cultures and mouse brain tissues (samples ready for analysis). We will analyse primary human neuronal cells exposed to BMAA for protein changes, as well as observe MND pathologies in these cells to establish if BMAA does contribute to the development of MND.

Expected outcomes
(1) Determine if BMAA is integrated or associated with MND related proteins

(2) Establish the role of BMAA in causing MND-like pathologies in cell cultures and mouse brain tissue sections

Key techniques

Cell culture, microscopy, immunostaining, protein dysfunction, proteostasis

Community engagement

Conduct tours through the Centre for MND Research laboratories

Engaging with the MND community through community and fundraising events to raise awareness, and understand research interests and concerns of the MND community

Research engagement

Presentations at conferences and invited talks including 

  • International ALS/MND Conference 2018 (Glasgow, Scotland)
  • Sorbonne Univerisites (Paris, France)
  • University College London,  Queen Square Institute of Neurology (London, UK)
  • International Society of Tryptophan Research Conference 2018 (Hikone, Japan)
  • Neuroimmunology Australia 2017 (Sydney, Australia)
  • various local and international conferences and universities

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  • 11 Similar Profiles
Amyotrophic Lateral Sclerosis Medicine & Life Sciences
Kynurenine Medicine & Life Sciences
Quinolinic Acid Medicine & Life Sciences
Neurons Chemical Compounds
Toxicity Chemical Compounds
Astrocytes Medicine & Life Sciences
Biomarkers Medicine & Life Sciences
Neurodegenerative Diseases Medicine & Life Sciences

Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Projects 2015 2019

Research Outputs 2015 2019

  • 87 Citations
  • 3 h-Index
  • 6 Article
  • 2 Review article

Kynurenine pathway metabolites as biomarkers for Amyotrophic Lateral Sclerosis

Tan, V. X. & Guillemin, G. J., 20 Sep 2019, In : Frontiers in Neuroscience. 13, p. 1-11 11 p., 1013.

Research output: Contribution to journalReview articleResearchpeer-review

Open Access
File
Kynurenine
Amyotrophic Lateral Sclerosis
Biomarkers
Body Fluids
Blood-Brain Barrier

Neuroprotective effect of myxobacterial extracts on quinolinic acid-induced toxicity in primary human neurons

Dehhaghi, M., Tan, V., Heng, B., Braidy, N., Mohammadipanah, F. & Guillemin, G. J., Feb 2019, In : Neurotoxicity Research. 35, 2, p. 281-290 10 p.

Research output: Contribution to journalArticleResearchpeer-review

Quinolinic Acid
Neuroprotective Agents
Neurons
Toxicity
Stigmatella

Protective effects of myxobacterial extracts on hydrogen peroxide-induced toxicity on human primary astrocytes

Dehhaghi, M., Tan, V., Heng, B., Mohammadipanah, F. & Guillemin, G. J., 10 Feb 2019, In : Neuroscience. 399, p. 1-11 11 p.

Research output: Contribution to journalArticleResearchpeer-review

Astrocytes
Hydrogen Peroxide
Oxidative Stress
Cell Death
Myxococcales

Detection of the cyanotoxins L-BMAA uptake and accumulation in primary neurons and astrocytes

Tan, V. X., Mazzocco, C., Varney, B., Bodet, D., Guillemin, T. A., Bessede, A. & Guillemin, G. J., Jan 2018, In : Neurotoxicity Research. 33, 1, p. 55–61 7 p.

Research output: Contribution to journalArticleResearchpeer-review

Astrocytes
Neurons
Toxicity
Brain
Neurodegenerative diseases

Neurotoxicity of the cyanotoxin BMAA through axonal degeneration and intercellular spreading

Tan, V. X., Lassus, B., Lim, C. K., Tixador, P., Courte, J., Bessede, A., Guillemin, G. J. & Peyrin, J. M., Jan 2018, In : Neurotoxicity Research. 33, 1, p. 62-75 14 p.

Research output: Contribution to journalArticleResearchpeer-review

Neurons
Corpus Striatum
Toxicity
Neurodegenerative diseases
Microfluidics