Study identifies protein that accelerates development of Alzheimer's

A scientific discovery could represent an important advance in the fight against Alzheimer's disease. Researchers have identified that a protein known as Arc plays a fundamental role in the propagation of the tau protein, considered one of the main responsible for the progression of the disease in the brain. The study was published in the scientific journal Cell and was conducted by scientists at the University of Utah, in the United States. When the tau protein undergoes changes, it forms toxic clusters that compromise the functioning and lead to the death of neurons. Although its role has been known for years, there was still an important question: how this protein manages to spread from a sick brain cell to a healthy one, increasing the damage over time. The researchers discovered that the Arc protein acts as a kind of "packager." It encases tau in small extracellular vesicles - microscopic structures similar to small bubbles - and allows this material to be released by the neuron. Although this process appears to be an attempt by the cell itself to eliminate a toxic substance, it ends up producing the opposite effect. The vesicles containing the tau protein are absorbed by healthy neurons, initiating new outbreaks of the disease and accelerating its spread throughout the brain. Explanation for treatment failure The discovery also helps to understand why several drugs developed in recent years have shown limited results. Many therapies use antibodies to eliminate the tau protein present between cells, but they cannot reach those protected within the vesicles produced by the Arc protein. As a result, a significant part of the toxic protein remains hidden, continuing to infect other brain cells. New treatment possibility During the research, scientists analyzed brain tissues from 15 people, including individuals without Alzheimer's, one patient in the early stage of the disease and seven patients in the advanced stage. The results showed that the greater the amount of Arc protein present in these vesicles, the greater the concentration of toxic tau protein. Therefore, researchers believe that blocking the action of Arc or preventing it from transporting tau could stop the spread of the disease through the nervous system, paving the way for a new generation of treatments capable of slowing or even preventing the progression of Alzheimer's. Research analyzed different biological levels The authors highlight that the study was developed using different scientific approaches, including molecular analyses, cellular experiments, computational models, tests on organisms and validation on patient samples. This combination makes the results more robust and reinforces the discovery's potential to guide future research and the development of more effective therapies against one of the neurodegenerative diseases that most affect the world's population.