Activity assays for BACE1 (β-secretase) and ADAM10 (α-secretase) were carried out according to the manufacturer’s instructions (AnaSpec, Fremont, CA, USA). The final concentrations of Hup A were 0.1, 1, and 10 μM. Inhibitors of BACE1 (LY2886721) or ADAM10 (GM 6001) obtained from the assay kits were employed for the experimental positive group (positive control). The fluorescence intensity was measured in a Synergy HTX multimode reader (BioTek, Winooski, VT, USA) at excitation/emission wavelengths of 490/520 nm.
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