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Clinical & Pharma
Science of the Future

Developing Ways to Diagnose Alzheimer’s Disease Early

5 Mar 2020
- by Dr Alison Halliday

Baby girl warm jacket and cap c grandfather hands in

Scientists are searching for biochemical changes in body fluids that are early indicators of Alzheimer’s disease. A new study devises a sensitive method for detecting 15 metabolites in cerebrospinal fluid, opening the door for investigating their potential as diagnostic markers.

It’s estimated that almost 47 million people worldwide are living with dementia, with numbers predicted to double every 20 years.

Alzheimer’s disease (AD) is the most common type of dementia, accounting for about two-thirds of cases in older people. A person will experience problems with memory loss and other cognitive abilities, with their symptoms developing slowly and getting gradually worse over time.

Sadly, there is no cure. But current treatments can temporarily slow down the worsening of symptoms, helping to maximize the quality of life of those affected by the disease and their caregivers for as long as possible.

Currently, there is no single definitive test that can diagnose Alzheimer’s disease. Instead, doctors will make a clinical judgment based on a series of assessments and tests that will likely include a thorough medical history, physical check-up, and memory tests, as well as brain scans or blood tests.

Benefits of Early Diagnosis of Alzheimer’s Disease

An early diagnosis of Alzheimer’s disease can provide a range of advantages, including access to the right support and treatment and precious time to plan ahead. Importantly, scientists believe that treatments will be most effective when administered early in the disease process before significant brain damage occurs.
But Alzheimer’s disease is currently difficult to diagnose when it’s in the early stages, with no established diagnostic test.

For such a test to be developed, scientists first need to identify distinctive changes in biological molecules in blood or other body fluids of people who go on to develop Alzheimer’s. The hope is that these can be developed into a reliable diagnostic test that can accurately indicate the presence of the disease before the onset of symptoms.
Disrupted biochemical pathways

Cerebrospinal fluid (CSF) could be a source of such molecules, as biochemical changes within the nervous system may be indicative of the early stages of Alzheimer’s disease. Metabolites, which are generated by the body’s metabolism, are attracting considerable attention, with alterations within CSF reported as many as several decades before the onset of symptoms.

One potential set of metabolites being studied are the polyamines, which are by-products of a biochemical pathway called the ornithine cycle. Studies have shown these are overly abundant in brain tissue samples from Alzheimer’s patients. 

A Sensitive New Analytical Technique for Early Detection of Alzheimer’s Disease

In a new study, researchers have developed a sensitive new way of enabling the detection and quantification of 15 different metabolites associated with the ornithine pathway and polyamine metabolism in CSF.(1)

The team used ultra-high-performance liquid chromatography-electrospray ionization tandem mass spectrometry (UHPLC-ESI-MS/MS) to measure these metabolites in human CSF samples. For their experiments, they used pressure-free ultra-purified water obtained using a PURELAB flex 5 system from ELGA LabWater.

This protocol sets the stage for further studies to analyze the relationship of these metabolites in the CSF of people who later go on to develop Alzheimer’s disease, with the potential to extend to the analysis of other body tissues, such as brain or blood.

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ELGA has been a trusted name in pure and ultrapure water since 1937. We believe in giving you choice in how you use our water purification solutions, supported by excellent service and support.


Reference:
Tsutsui, H. et al., Development of targeted metabolomics for the determination of ornithine cycle compounds as possible biomarkers in cerebrospinal fluid regarding to Alzheimer’s disease pathology using UHPLC-ESI-MS/MS. Medical Mass Spectrometry. June 2018 Vol. 2 No. 1, 1-10.
 

Dr Alison Halliday
After completing an undergraduate degree in Biochemistry & Genetics at Sheffield University, Alison was awarded a PhD in Human Molecular Genetics at the University of Newcastle. She carried out five years as a Senior Postdoctoral Research Fellow at UCL, investigating the genes involved in childhood obesity syndrome. Moving into science communications, she spent ten years at Cancer Research UK engaging the public about the charity’s work. She now specialises in writing about research across the life sciences, medicine and health.

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