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  • Title: New racemic annulated pyrazolo[1,2-b]phthalazines as tacrine-like AChE inhibitors with potential use in Alzheimer's disease.
    Author: Jalili-Baleh L, Nadri H, Moradi A, Bukhari SNA, Shakibaie M, Jafari M, Golshani M, Homayouni Moghadam F, Firoozpour L, Asadipour A, Emami S, Khoobi M, Foroumadi A.
    Journal: Eur J Med Chem; 2017 Oct 20; 139():280-289. PubMed ID: 28803044.
    Abstract:
    A novel series of tacrine-like compounds 7a-u possessing a fused pyrazolo[1,2-b]phthalazine structure were designed and synthesized as potent and selective inhibitors of AChE. The in-vitro biological assessments demonstrated that several compounds had high anti-AChE activity at nano-molar level. The more promising compound 7l with IC50 of 49 nM was 7-fold more potent than tacrine and unlike tacrine, it was highly selective against AChE over BuChE. The cell-based assays against hepatocytes (HepG2) and neuronal cell line (PC12) revealed that 7l had significantly lower hepatotoxicity compared to tacrine, with additional neuroprotective activity against H2O2-induced damage in PC12 cells. This compound could also inhibit AChE-induced and self-induced Aβ peptide aggregation. The advantages including synthetic accessibility, high potency and selectivity, low toxicity, adjunctive neuroprotective and Aβ aggregation inhibitory activity, make this compound as a new multifunctional lead for Alzheimer's disease drug discovery.
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