Research brief
A study in Neuroreport examines how ononin, a natural compound, affects mild cognitive impairment (MCI) in mice. The research used APP/PS1 mice, genetically engineered to mimic Alzheimer’s symptoms. After administering ononin, researchers noted improved cognitive performance and neuronal function. These findings suggest ononin may help address cognitive deficits linked to MCI, though its effects on humans are still unknown.
Key points
- Ononin improved cognitive test results in APP/PS1 mice.
- Key brain regions showed increased neuronal activity.
- Cerebral blood flow improved after treatment.
Cognitive Improvements in Mice
Researchers worked with four-month-old APP/PS1 mice, administering 30 mg/kg of ononin orally over eight days. The mice underwent behavioural tests like the novel object recognition and Y-maze tests. Results showed a marked improvement in their ability to recognise new objects and navigate mazes, suggesting ononin may enhance cognitive function in this MCI model.
Increased Neuronal Activity
The study found that ononin treatment increased neuronal activation in the nucleus tractus solitarius (NTS), hippocampal CA1 region, and cortex. This was indicated by a rise in c-Fos-positive cells, showing more active neurons. Ononin also restored dendritic spine density and increased dendritic intersections in NTS neurons, suggesting improved synaptic plasticity.
Enhanced Brain Blood Flow
Researchers observed improved cerebral perfusion after ononin administration. Using laser speckle contrast imaging, they found that brain blood flow significantly increased. This enhancement in cerebral blood flow may help explain the cognitive improvements, as it likely supports better delivery of oxygen and nutrients to brain tissues.
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