Western blot analyses were conducted under reducing conditions as described before [23 (link)]. Specially, 16 μg protein of each TBS-T fraction and 1.2 μg protein of each FA fraction were loaded per well. The primary antibodies and their dilutions used in this study are as follows: anti-sFRP1 (Invitrogen, MA5–38193, 1:1000), anti-ADAM10 (Santa Cruz Biotechnology, SC-28358, 1:1000) and anti-β-actin (Sigma Life Sciences, A2228, 1:5000). The membrane for detecting sFRP1 in FA fraction was restained with Revert 700 total protein stain solution (LI-COR Biosciences) for total protein quantification.