Imaging technique reveals metabolic and oxygen changes in Alzheimer's brain
Researchers combined two-photon fluorescence lifetime imaging microscopy and phosphorescence lifetime imaging microscopy to measure metabolism and oxygen in the living mouse cerebral cortex. They compared Alzheimer's disease model mice with healthy wild-type mice, focusing on NAD(P)H states and oxygen availability. The approach aims to clarify how energy production and oxygen supply interact in Alzheimer's disease.
Alzheimer’s is usually associated with memory and cognitive decline, yet it also alters how brain cells generate and consume energy. Mitochondrial dysfunction and shifts in blood flow or oxygen delivery can add stress to neural tissue, making it useful to observe metabolism and oxygenation together.
In mice, researchers at the University of Virginia paired two-photon FLIM with PLIM. FLIM tracked NAD(P)H lifetimes, distinguishing free from protein-bound forms as a readout of mitochondrial activity. PLIM used a ruthenium-based oxygen probe whose phosphorescence lifetime varies with oxygen, estimating vascular pO₂. The setup compared Alzheimer’s model mice with healthy wild-type mice.
This work may mainly affect Alzheimer’s researchers and, over time, people with the disease and their caregivers. By linking metabolic and oxygen measurements in living brain tissue, it could help clarify disease mechanisms and inform future investigations. However, because findings come from mouse models, clinical relevance remains uncertain; any societal benefit would depend on replication, validation, and translation into human studies.