Researchers at Baylor College of Medicine have discovered that tubulin can redirect harmful proteins associated with Alzheimer’s and Parkinson’s away from forming toxic clumps.
New Delhi, India Jul 3, 2026 ALN: Scientists at Baylor College of Medicine have identified a potential new approach for tackling Alzheimer's and Parkinson's diseases. Both conditions are associated with the buildup of harmful clumps formed by the proteins Tau and alpha synuclein in the brain. These diseases are among the most common neurodegenerative disorders, affecting millions of individuals worldwide and presenting significant challenges for care systems.
In a study published in Nature Communications, the researchers found that tubulin, a protein that serves as the building block of microtubules, may help prevent these toxic accumulations. Microtubules act as the cell's internal 'railway tracks,' helping transport materials and maintain structure. According to the findings, tubulin can keep Tau and alpha synuclein from forming damaging aggregates and instead encourage them to perform their normal functions inside neurons.
Toxic Protein Clumps and Brain Disease
Alzheimer's disease is characterized by the formation of amyloid plaques and neurofibrillary tangles, primarily composed of misfolded Tau proteins. Similarly, in Parkinson's disease, alpha synuclein aggregates form Lewy bodies, which are toxic to neurons. The presence of these aggregates is linked to neuronal death, leading to the cognitive decline seen in Alzheimer's patients and the motor symptoms associated with Parkinson's disease. "Tau and alpha synuclein are well known for their roles in neurodegenerative diseases like Alzheimer's and Parkinson's. In these conditions, these proteins can misfold, stick together and form harmful aggregates that damage neurons and contribute to memory loss, movement problems and other symptoms," said first author Dr. Lathan Lucas, postdoctoral associate of biochemistry and molecular pharmacology in Dr. Allan Ferreon's lab.
Despite their toxic potential, Tau and alpha synuclein also fulfill essential functions in neurons. They help maintain cell structure and support communication by interacting with tubulin and contributing to microtubule assembly and stabilization. This duality presents a significant challenge in developing therapeutic strategies: while targeting the aggregates may alleviate some symptoms, it is crucial to preserve the normal functions of these proteins.
Tau and alpha synuclein carry out both their beneficial and harmful activities within tiny cellular droplets known as condensates. These condensates are dynamic structures that play a role in organizing cellular components and facilitating biochemical reactions. Because these droplets are involved in disease-related processes, scientists have considered preventing their formation as a possible treatment strategy. However, condensates also play important roles in normal brain function, raising concerns that eliminating them could disrupt neuronal activity.
Redirecting Proteins Toward a y Role
This led researchers to explore an alternative approach. "What if instead of preventing the formation of droplets, we created conditions that would drive Tau and alpha synuclein inside the droplets toward their y path, discouraging them from taking the disease path?" said Ferreon, associate professor of biochemistry and molecular pharmacology and co-corresponding author of the work. The idea is to redirect the behavior of these proteins in a way that enhances their beneficial functions while minimizing their propensity to aggregate.
Lucas offered an analogy to explain the concept. "I think of Tau and alpha synuclein as troublemaker kids in school. You can keep them in the classroom with little to do but to act out or keep them engaged with schoolwork, sports or theater so they do not get in trouble," Lucas said. "We found that tubulin can drive Tau and alpha synuclein troublemakers down a y path." This analogy underscores the importance of providing the right environment and conditions for these proteins to function correctly.
To investigate the idea, the researchers combined biochemical and biophysical methods with high-resolution microscopy and neuron-based assays. Their goal was to determine whether tubulin could influence the behavior of Tau and alpha synuclein and prevent the formation of toxic aggregates within condensates. The methodology employed not only advanced imaging techniques but also various assays that mimic the cellular environment, allowing for a comprehensive understanding of protein interactions.
Tubulin Acts as a Protective Factor
Through their experiments, the researchers discovered that tubulin plays a critical role in determining the fate of Tau and alpha synuclein within cells. "When tubulin levels are low, as it has been found in Alzheimer's disease, microtubules are less abundant and Tau and alpha synuclein can form toxic aggregates," Lucas said. This finding indicates that maintaining adequate levels of tubulin could be essential for neuronal .
"But when tubulin is present, Tau and alpha-synuclein shift away from harmful aggregates and instead promote the assembly of y microtubules," Lucas added. "Tubulin redirects the activity of these proteins by giving them something productive to do." This suggests that enhancing tubulin levels or function could represent a viable therapeutic strategy for mitigating the effects of neurodegenerative diseases.
The findings suggest that tubulin may play a much more active role in protecting the brain than previously recognized. "Our findings significantly shift tubulin's role in neurodegeneration, from a passive casualty of disease to an active protector against toxic protein aggregation," Ferreon said. This shift in understanding highlights the potential for tubulin-targeted therapies that could alter the course of diseases like Alzheimer's and Parkinson's.
Furthermore, boosting the tubulin pool, rather than blocking droplet formation, can curb toxic aggregation while preserving the y roles of Tau and alpha synuclein, offering a potential selective therapeutic strategy. This approach could lead to new treatment options that do not merely aim to reduce symptoms but also address underlying mechanisms of disease.
In summary, the study conducted by Baylor College of Medicine researchers opens new avenues for research and potential therapeutic interventions in the treatment of Alzheimer's and Parkinson's diseases. By understanding the role of tubulin in regulating the behavior of Tau and alpha synuclein, scientists may develop innovative strategies to combat these debilitating conditions.
Other contributors to the study include co-first author Phoebe S. Tsoi, My Diem Quan, Kyoung-Jae Choi and co-corresponding author Josephine C. Ferreon, all at Baylor College of Medicine.
The research was supported by NINDS-NIH grant R01 NS105874, Welch Foundation grant Q-2097-20220331 and NIGMS-NIH grant R01 GM122763.
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