Single-Molecule Imaging Reveals How Copper Imbalance May Drive Alzheimer's, Parkinson's, and ALS
核心洞察
University of Houston researchers developed a groundbreaking single-molecule imaging technique to observe individual CTR1 (搜索) protein complexes inside living cells, revealing previously hidden copper regulation dynamics.
The team discovered that the copper transport protein CTR1 (搜索) changes its structure when copper levels become too high, reducing copper uptake as a protective cellular mechanism, published in Nature Communications.
A new $2.16 million NIH grant will fund investigation into how disruptions in copper-regulating behavior connect to signaling in human neurons and may contribute to neurodegenerative diseases.
A University of Houston research team has developed a groundbreaking single-molecule imaging technique that is shedding new light on how copper imbalances in the body may contribute to neurodegenerative diseases, including Alzheimer's, Parkinson's, and ALS (搜索). The work, led by Tai-Yen Chen, associate professor of chemistry at UH, has now been bolstered by a $2.16 million grant from the National Institute of General Medical Sciences, part of the National Institutes of Health.
The five-year grant renewal builds on Chen's earlier findings on cellular copper homeostasis, which were recently published in Nature Communications. That foundational research challenged a long-standing view of how the copper transport protein CTR1 (搜索) operates, opening new questions about how copper regulation influences cell function and development.
"We discovered that a protein called CTR1 (搜索), which brings copper into cells, is much more dynamic than scientists previously thought," Chen said. "We found that when copper levels become too high, CTR1 changes its structure in a way that helps reduce copper uptake. This appears to be an important mechanism that cells use to maintain healthy copper levels."
A New Window into Cellular Copper Regulation
While the root cause of Alzheimer's, Parkinson's, and ALS (搜索) remains largely unknown and existing medications only manage symptoms, researchers have long linked copper imbalances within neurons to severe neurological disorders. Chen hopes to pinpoint the exact cellular pathways that fail, providing the foundational knowledge needed to develop future cures and guide therapeutic strategies.
The new grant will allow Chen's team to investigate how this copper-regulating behavior is connected to signaling in human neurons and how disruptions in this process may contribute to neurodegenerative disease. Over the past decade, Chen's lab has secured more than $4 million to examine how copper regulation supports healthy brain development, with the initial $1.9 million NIGMS grant awarded in 2019.
Single-Molecule Precision Reveals Hidden Biology
Traditional biochemical methods, while powerful for measuring overall trends, typically report an average signal from many cells and many proteins. That averaging can obscure small differences between individual cells, unusual protein behaviors, or short-lived events that may be important in disease.
Chen's single-molecule approach overcomes these limitations by enabling researchers to watch and measure individual CTR1 (搜索) protein complexes inside individual cells. This allows the team to see differences from cell to cell and detect rare protein behaviors that may be hidden when scientists only measure large groups of cells at once.
"Some neurological diseases have been pretty much unsolvable in the past because there were no effective approaches to ask these complex questions," Chen said. "Now, with our unique imaging approach, new questions can be asked quantitatively, which can provide insight and move the field forward."
The imaging tools developed in Chen's lab could eventually help scientists study other diseases and biological processes in which rare molecular events or differences between individual cells play an important role, potentially broadening the impact of this technology well beyond neurodegenerative disease research.