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• W3003647872 abstract "Abstract M 1 muscarinic acetylcholine receptor (M 1 R) activation can be a new therapeutic approach for the treatment of cognitive deficits associated with cholinergic hypofunction. However, M 1 R activation causes gastrointestinal (GI) side effects in animals. We previously found that an M 1 R positive allosteric modulator (PAM) with lower cooperativity (α‐value) has a limited impact on ileum contraction and can produce a wider margin between cognitive improvement and GI side effects. In fact, TAK‐071, a novel M 1 R PAM with low cooperativity (α‐value of 199), improved scopolamine‐induced cognitive deficits with a wider margin against GI side effects than a high cooperative M 1 R PAM, T‐662 (α‐value of 1786), in rats. Here, we describe the pharmacological characteristics of a novel low cooperative M 1 R PAM T‐495 (α‐value of 170), using the clinically tested higher cooperative M 1 R PAM MK‐7622 (α‐value of 511) as a control. In rats, T‐495 caused diarrhea at a 100‐fold higher dose than that required for the improvement of scopolamine‐induced memory deficits. Contrastingly, MK‐7622 showed memory improvement and induction of diarrhea at an equal dose. Combination of T‐495, but not of MK‐7622, and donepezil at each sub‐effective dose improved scopolamine‐induced memory deficits. Additionally, in mice with reduced acetylcholine levels in the forebrain via overexpression of A53T α‐synuclein (ie, a mouse model of dementia with Lewy bodies and Parkinson's disease with dementia), T‐495, like donepezil, reversed the memory deficits in the contextual fear conditioning test and Y‐maze task. Thus, low cooperative M 1 R PAMs are promising agents for the treatment of memory deficits associated with cholinergic dysfunction." @default.
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• W3003647872 date "2020-01-28" @default.
• W3003647872 modified "2023-09-28" @default.
• W3003647872 title "T‐495, a novel low cooperative M₁receptor positive allosteric modulator, improves memory deficits associated with cholinergic dysfunction and is characterized by low gastrointestinal side effect risk" @default.
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• W3003647872 doi "https://doi.org/10.1002/prp2.560" @default.
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