Structural changes in blood plasma proteins may reflect earliest signs of Alzheimer's disease: Study

A new type of blood test that analyses the folding of amino acids rather than their amounts may detect earliest biological signs of Alzheimers disease according to a studyAnalysis of blood plasma samples from over 500 individuals show that structural differences in three proteins one involved in immune signalling another in protein folding and a third that transports fats in bloodstream are strongly linked to Alzheimers status according to the findings published in the Nature Aging journalResearchers including those at The Scripps Research Institute US said structural differences of plasma proteins helped accurately distinguish cognitively normal individuals from those with Alzheimers and mild cognitive impairment the preceding stageThe method could eventually allow early diagnosis and treatment they saidAlzheimers disease is currently diagnosed by measuring amyloid plaques and tau tangles formed due to accumulation of amyloid and tau proteins in ones brain in blood or spinal fluidHowever the neurodegenerative condition is increasingly thought to involve a broader failure of proteostasis a system responsible for keeping proteins properly folded and removing damaged ones researchers saidThe system is said to become less effective with ageing because of which proteins are more likely to fold incorrectly during formation or restructuring they saidMany neurodegenerative diseases are driven by changes in protein structure The question was are there structural changes in specific proteins that might be useful as predictive markers senior author John Yates a professor at The Scripps Research Institute saidThe researchers proposed that if proteostasis is disrupted in the brain similar structural changes might also appear in proteins circulating in bloodPlasma samples from the participants were divided into three groups cognitively normal adults individuals with mild cognitive impairment and patients diagnosed with AlzheimersThe analysis determined how exposed or buried certain specific areas were in threedimensional amino acid chain indicating changes to their structure Machine learning a form of artificial intelligence was used to identify patterns connected to disease stageAs Alzheimers disease advanced specific blood proteins became less structurally open with structural changes of three showing the strongest association with diseaseThe proteins were C1QA involved in immune signalling clusterin involved in protein folding and amyloid removal and apolipoprotein B which transports fats in the bloodstream and contributes to blood vessel healthThe structural changes proved to be more informative for identifying disease stage than simply measuring protein concentrations researchers saidThis multimarker panel based on plasma protein structural alterations represents a promising diagnostic approach that may enhance early AD Alzheimers disease detection and provide insights for clinical trials improving therapeutic outcomes the authors wroteThis story has been sourced from a third party syndicated feed agencies Midday accepts no responsibility or liability for its dependability trustworthiness reliability and data of the text Midday managementmiddaycom reserves the sole right to alter delete or remove without notice the content in its absolute discretion for any reason whatsoever