The research that was carried out on the mice showed a dramatic
reduction of amyloid protein in the visual cortices of the animals after just one hour of being under the light.
Not exact matches
Additional experiments with cultured cells suggested that the mutation interferes with one
of the enzymes that breaks down the APP
protein and causes a 40 %
reduction in β
amyloid formation, Stefansson and colleagues report online today in Nature.
Telomere length predicts both cellular health and disease in rodent models and humans.8 Shorter telomeres predict onset
of cardiometabolic diseases
of aging.9 Chronic stress is associated with higher inflammation, shorter telomeres, and lower activity levels
of telomerase, the cellular enzyme that elongates telomeric DNA.10, 11 Levels
of amyloid beta (Aβ)
proteins circulating in the blood appear to be stress - related in rodent models12 and may be affected by stress
reduction, and greater Aβ42 / Aβ40 ratios are associated with lower risk
of dementia.13
The resulting
amyloid - β
reductions in gamma - stimulated animals were likely due both to lower production
of the
protein and to microglia clearing more
of it away, the authors wrote.
''... we hypothesize that repeated stress - related allostatic overload may affect brain function at three basic levels: (a) at the cellular level, it may compromise proteostasis (e.g. tau
protein), organelles homeostasis, and induce epigenetic changes in neuronal DNA; (b) at the tissue level it may affect intracellular communication (synaptic contacts), number
of cells (
reduction of neuronal density), composition
of the extracellular matrix (accumulation
of amyloid plaques), and neuroinflammation; (c) at the systemic levels it may alter the brain's regulation
of behavior (cognitive decline).
A substudy from one
of the outpatient obesity trials found that both the low - carbohydrate and low - fat diets led to
reductions in C - reactive
protein and plasma serum
amyloid A (85).
There are precedents that parallel our apparently paradoxical finding.36, 37 In a β -
amyloid immunization trial among those with probable Alzheimer disease, immunization led to significant clinical benefit, reduced β -
amyloid load, and reduced brain volume.36 The investigators hypothesized that removal
of β -
amyloid and / or other
protein constituents from brain tissue may have caused cerebral fluid shifts, resulting in brain volume
reductions on magnetic resonance imaging.