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Friday, July 15, 2016

Progress in world's first Alzheimer's vaccine

July 14, 2016


Dr Nikolai Petrovsky and a 3D protein model being used in the development of a possible Alzheimer’s disease vaccine. Credit: Flinders University


With more than 7.5 million new cases of Alzheimer's disease a year, the race to find a vaccine and effective treatment for dementia is growing by the day.


Now, researchers in the U.S. and Australia have made a breakthrough discovery in the international quest to discover a new and potentially effective vaccine targeting the pathological proteins associated with Alzheimer's disease (AD), the most common cause of dementia in the elderly.

In research findings just released in Nature's Scientific Reports journal, Flinders University experts, as part of a high-level U.S. research team at the Institute of Molecular Medicine (IMM) and University of California, Irvine (UCI), have made a successful vaccine formulation that targets the abnormal beta-amyloid and tau proteins that signal Alzheimer's disease.

With more than 48 million dementia cases in 2015, Alzheimer's is emerging as one of the costliest to the world's health care systems, especially in mature economies in Western countries.
The World Health Organisation has projected the total global societal cost of dementia-related illnesses and care at more than $US600 billion a year.

"If we are successful in pre-clinical trials, in three to five years, we could be well on the way to one of the most important developments in recent medical history," says Flinders University School of Medicine Professor Nikolai Petrovsky, director of South Australian vaccine research company Vaxine Pty Ltd.
"Along with our rapidly aging populations, we now know that the explosion in type 2 diabetes in the West is likely to further dramatically fuel the projected rise in the number of cases of dementia globally, with diabetes being the major risk factor for Alzheimer's disease," Professor Petrovsky says.
The scale of the dementia problem has seen the U.S. Congress commit a further $US350 million to the National Institutes of Health (NIH) for research into Alzheimer's disease, taking research funding in the US to more than $US1.3 billion this year.

With NIH and Alzheimer's Association funding, the U.S. researchers say they have developed an "exceptional" universal vaccine platform, called MultiTEP, to target the hallmark proteins, aberrant forms of AB and tau proteins.

β-amyloid (AB) is a protein found to be prominent in driving Alzheimer's disease, but the accumulation of pathological tau also correlates with the formation of dementia in Alzheimer's patients.
Using a combination of anti-amyloid-beta and anti-tau vaccines with powerful and safe adjuvant technology called Advax developed by Vaxine Pty Ltd "shows promise for both preventive and therapeutic approaches in AD," Professor David Cribbs told Bloomberg news agency in the U.S.
Professor Michael Agadjanyan, head of IMM Department of Molecular Immunology, says the MultiTEP platform-based vaccines "do not induce potentially harmful auto-reactive cellular immune responses, while still generating antibodies that bind strongly to the amyloid and tau pathological molecules in brain tissue from AD patients."

Co-author of the latest paper, IMM Department of Molecular Immunology, Associate Professor Anahit Ghochikyan, says, "This study suggests that we can immunise patients at the early stages of AD, or even healthy people at risk for AD, using our anti-amyloid-beta vaccine, and, if the disease progresses, then vaccinate with another anti-tau vaccine to increase effectiveness."
She says the cooperative studies with National Institute of Aging IMM scientists and collaborators from UCI and the University of Southern California are working with experts from four companies to conduct non-clinical safety-toxicology studies to fulfil US Government safety standards for the Investigational New Drug application.

After completion of these pre-clinical studies, they plan to test the immunogenicity and efficacy of the new vaccines in human trials.
Cutting-edge research company Vaxine Pty Ltd is internationally renowned for developing the world's first swine flu vaccine during the 2009 pandemic and is active on other fronts including Ebola and Zika virus research.
The vaxine is funded by the U.S. NIH to develop novel compounds called adjuvants that play a critical role in maximising vaccine effectiveness. The Vaxine Advax adjuvant technology is a key component in the development of IMM's Alzheimer's vaccine.

More information: Hayk Davtyan et al. Alzheimer's disease AdvaxCpG- adjuvanted MultiTEP-based dual and single vaccines induce high-titer antibodies against various forms of tau and Aβ pathological molecules, Scientific Reports (2016). DOI: 10.1038/srep28912

http://medicalxpress.com/news/2016-07-world-alzheimer-vaccine.html

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