Study Links Oligodendrocyte NRF2 Changes to Cognitive Decline in Aging Mice
Research examining aging-related white matter changes in humans and mice linked poorer cognitive trajectories with altered oligodendrocyte behavior, including reduced NRF2 activity. In aged mice, selectively removing NRF2 from oligodendrocytes was associated with less cognitive improvement and changes resembling those observed in human cognitive decline, although the findings do not establish a treatment for preserving cognition.
A study of aging-related white matter changes has identified oligodendrocytes—and the NRF2 pathway active within them—as possible contributors to differences in cognitive decline, based on findings from human tissue and genetically modified mice.
Oligodendrocytes produce and maintain myelin, the insulating material surrounding neuronal axons. Myelin helps electrical signals travel efficiently between neurons and also provides metabolic support. Although aging is associated with changes in myelin and oligodendrocytes, the source reports that the relationship is more complex than a straightforward loss of myelin or reduced remyelination.
The researchers examined neuropathological and transcriptomic changes in human white matter in relation to individuals’ rates of cognitive decline. Worse cognitive trajectories were associated with smaller myelinated axons, thicker myelin, and a greater number of oligodendrocytes showing reduced activity of NRF2, a pathway highlighted in the study.
The human findings were observational: they identified relationships between white matter features, oligodendrocyte characteristics and cognitive trajectories. They did not by themselves establish that reduced NRF2 activity caused cognitive decline.
The researchers also studied aged mice in which NRF2 was specifically knocked out in oligodendrocytes. These animals showed less cognitive improvement over time and developed white matter characteristics that mirrored those associated with cognitive decline in the human analysis.
The findings add to evidence that cognitive aging may involve changes in how oligodendrocytes behave, rather than only a reduction in the amount or integrity of myelin. Previous work described in the source material has associated learning in mice with the generation of new oligodendrocytes, while cognitive impairment in aged mice and non-human primates has been linked with reductions in oligodendrocytes and myelin.
The researchers identified the NRF2 pathway as a potential target for future efforts to preserve cognition during human aging. However, the reported evidence combines observational analysis of human white matter with a preclinical mouse experiment. It does not demonstrate that altering NRF2 in humans would prevent or reverse cognitive decline, nor does it establish a clinically available intervention.
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