“This study is to explore the involvement of muscarinic acetylcholine receptors/protein kinase C cascade and the … A on the secretory amyloid precursor protein-&agr;. Upregulation of secretory amyloid precursor protein-&agr; by huperzine A … muscarinic acetylcholine receptor antagonist (specifically by M1-muscarinic acetylcholine … kinase C inhibitor as well.”