Journal
JAPANESE JOURNAL OF PHARMACOLOGY
Volume 84, Issue 2, Pages 101-112Publisher
JAPANESE PHARMACOLOGICAL SOC
DOI: 10.1254/jjp.84.101
Keywords
Alzheimer's disease; M1 muscarinic agonist; animal model; beta-amyloid; tau
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The cholinergic hypofunction in Alzheimer's disease (AD) appears to be linked with two other major hallmarks of this disease, beta -amyloid and hyperphosphorylated tau protein. Formation of beta -amyloids might impair the coupling of M1 muscarinic acetylcholine receptors (mAChR) with G-proteins. This can lead to decreased signal transduction, a decrease of trophic and non-amyloidogenic amyloid precursor protein (APPs) and generation of more beta -amyloids, aggravating further the cholinergic deficiency. This review is an attempt to explore the M1 mAChR regulation of beta -amyloid metabolism, tau hyperphosphorylation and cognitive functions. The therapeutic potential of Mi-selective muscarinic agonists including AF102B, AF150(S), AF267B (the AF series) is evaluated and compared, when possible, with several FDA-approved acetylcholinesterase inhibitors. These M1 agonists can elevate APPs, decrease tau protein phosphorylation/hyperphosphorylation in vitro and in vivo and restore cognitive impairments in several animal models for AD. Except for the M1 agonists, no other compounds were reported yet with combined effects; e.g., amelioration of cognition dysfunction and beneficial modulation of APPs/beta -amyloid together with tau hyperphosphorylation/phosphorylation. This property of M1 agonists to alter different aspects associated with AD pathogenesis could represent the most remarkable clinical value of such drugs.
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