There is growing attention on natural substances capable of stimulating the
cholinergic system and of exerting
antioxidant effects, as potential therapeutic agents in
Alzheimer's disease (AD). The aim of the present study is to evaluate the expected neuroprotective mechanisms of
myrtenal (M) in an experimental model of
dementia in rats.
Dementia was induced in male Wistar rats by
scopolamine (Sc) administration (0.1 mg/kg for 8 days and 20.0 mg/kg on day 9). The animals were divided into 5 groups (1) Controls; (2) Sc; (3) Sc +
Myrtenal (40 mg/kg), (4) Sc +
Galantamine (1 mg/kg); (5) Sc +
Lipoic acid (30 mg/kg). Changes in recognition memory and habituation were evaluated via the Novel Object Recognition and Open Field tests.
Acetylcholinesterase (AChE) activity, ACh levels, and changes in oxidative status of the brain were measured biochemically. The histological changes in two brain regions-cortex and hippocampus, were evaluated qualitatively and quantitatively.
Myrtenal improved recognition memory and habituation, exerted
antioxidant effects and significantly increased ACh brain levels. Histologically, the neuroprotective capacity of
myrtenal was also confirmed. For the first time, we have demonstrated the neuroprotective potential of
myrtenal in an experimental model of
dementia. Our study provides proof-of-concept for the testing of
myrtenal, in association with standard of care treatments, in patients affected by
cognitive decline.