Gold nanoclusters could help break down Alzheimer's amyloid plaques

Alzheimer's disease is marked by progressive memory loss and mental decline, resulting from the accumulation of amyloid-β (Aβ) protein between brain cells, forming amyloid plaques. These plaques disrupt cell communication, cause inflammation, and damage crucial connections, leading to neuron death and Alzheimer's symptoms. Conventional therapies struggle to remove these protein clumps, as they form stubborn aggregates.

Researchers at Nankai University and Hebei University of Technology have developed a novel material that could help dismantle amyloid plaques. This material, a combination of naturally occurring protein ferritin and tiny clusters of gold (Au) atoms, was inspired by an unexpected discovery during research. The team found that ferritin nanocage-Au hybrid nanomaterials can disrupt preformed Aβ aggregates, which is different from other inorganic nanomaterials that typically interfere with Aβ aggregation nonspecifically.

The researchers aimed to create a bioactive nanostructure that specifically recognizes Aβ aggregates and remodels them using a well-defined molecular mechanism. They engineered a human ferritin nanocage with computational Aβ-recognition peptides on its surface, allowing the nanostructure to selectively target Aβ aggregates. This design provided excellent biocompatibility and acted as a programmable platform for organizing targeting ligands and gold nanostructures.

Upon testing the nanomaterial in genetically engineered mice with Alzheimer's-like amyloid accumulation, the team confirmed its potential to disassemble Aβ aggregates. They determined the nanomaterial's high-resolution protein structure and established a structural model of its interaction with Aβ aggregates. By integrating molecular dynamics simulations with experimental validation, the researchers visualized the microscopic dynamic process of aggregate disruption.

Through this study, the researchers uncovered the principles governing the dismantling of Aβ plaques at a structural and mechanistic level. This insight could inform the design of new protein-based nanomaterials targeting proteins linked to neurodegenerative diseases. The team's work offers the first detailed explanation for the therapeutic potential of bioactive hybrid materials combining ferritin and gold nanostructures, revealing how these carefully engineered nanomaterials engage Aβ aggregates and dynamically remodel them at the molecular level.