Exploring the Therapeutic Potential of N-(3,4-dimethoxy phenyl)-6,7-dimethoxyquinazoline-4-amine (TKM01) in Aluminium-Induced Alzheimer's Disease-Like Model of Zebrafish.

Aluminum (Al), a pervasive environmental neurotoxicant, has been strongly implicated in the onset and progression of Alzheimer's disease (AD)-like pathology. Chronic and sub-chronic exposure to aluminum chloride (AlCl3) induces cognitive deficits, oxidative stress, cholinergic dysfunction, neuroinflammation, and neuronal damage, making it a widely used agent for modeling AD in preclinical research. This study aimed to evaluate the neuroprotective efficacy of TKM01, a novel 4-anilinoquinazoline derivative, in an AlCl3-induced AD-like zebrafish model. Adult zebrafish were exposed to AlCl3 (11 mg/L for 15 days) and pre-treated with TKM01 at two concentrations (240 and 480 µg/mL). Behavioral assessments, including the T-maze, novel object recognition (NOR), and open field test (OFT), demonstrated significant improvements in spatial learning, recognition memory, and reduced anxiety-like behavior in TKM01-treated groups. Biochemical analyses revealed decreased acetylcholinesterase (AChE) activity and lipid peroxidation (LPO), alongside elevated antioxidant enzyme activities, including superoxide dismutase (SOD) and catalase (CAT). ELISA showed a reduction in pro-inflammatory cytokines (TNF-α and IL-1β), and RT-PCR analysis confirmed downregulation of NLRP3, ASC, and caspase A gene expression. Furthermore, histopathological examination revealed that TKM01 mitigated AlCl3-induced neuronal degeneration, edema, and cellular disorganization in brain telencephalon. Additionally, molecular docking and 200 ns molecular dynamics simulations supported stable and favorable binding interactions between TKM01 and IL-1β/ASC. Collectively, these findings suggest that TKM01 attenuates AlCl3-induced neurotoxicity via antioxidant, anti-inflammatory, anticholinesterase, and neuroprotective mechanisms. TKM01 emerges as a promising multifunctional therapeutic candidate for AD, warranting further investigation in mammalian models.