AMBMP Hydrochloride Reverses STZ-Induced Alzheimer-Type Dementia Associated with Wnt/β-catenin/TLR4 Signaling

Alzheimer's disease (AD) is a debilitating neurodegenerative disorder with progressive cognitive decline and neuronal loss. This study investigated the neuroprotective effects of AMBMP Hydrochloride, a Wnt/β-catenin agonist, in a streptozotocin (STZ)-induced mice model of AD, elucidating the interplay between dysregulated Wnt/β-catenin signaling and Toll-Like Receptor 4 (TLR4)-mediated inflammation, with Palmitic acid used as a TLR4 pathway modulator. Mice received bilateral intracerebroventricular (i.c.v.) injections of STZ (3 mg/kg) on Day 1 and Day 3, followed by administration of Donepezil (3 mg/kg)/ AMBMP Hydrochloride (5 mg/kg and 10 mg/kg)/Palmitic acid (TLR4 agonist, 20 mg/kg) via the intraperitoneal (i.p.) route from Day 4 to Day 22. STZ-treated mice exhibited significant cognitive dysfunction, characterized by impaired performance in the Morris Water Maze (MWM) task along with increase in acetylcholinesterase (AChE) activity, oxidative stress (thiobarbituric acid reactive substances; TBARS), neuroinflammation [tumor necrosis factor alpha (TNF-α)/Interleukin-6 (IL-6)/Interleukin-1 beta (IL-1β) and nuclear factor kappa B (NF-κB)] and decreased reduced glutathione (GSH) levels. However, AMBMP Hydrochloride significantly improved behavioral and biochemical alterations possibly through modulation of Wnt/β-catenin signaling and attenuation of TLR4-mediated inflammation. Interestingly, Palmitic acid co-treatment was found to counteract these protective effects, further pointing to a role of TLR4 in the pharmacological effect of AMBMP Hydrochloride. In summary, we confirmed that AMBMP Hydrochloride exhibits potent neuroprotective effects associated with modulating Wnt/β-catenin/TLR4 signaling, offering a promising therapeutic approach against Alzheimer-Type Dementia. Future studies should delve deeper into the molecular mechanisms and translational promise of AMBMP hydrochloride, paving the way for its development as a potential candidate for AD management.