LTP was induced in cultured hippocampal neurons with a glycine-mediated form of cLTP as previously described (Fortin et al., 2010 (link), Stamatakou et al., 2013 (link)). To block Wnts, a combination of recombinant Sfrp1 (2.5 μg/mL; R&D Systems, Abingdon, UK) and Sfrp3 (250 ng/mL; R&D Systems) was used throughout the induction of cLTP and during the incubation with control solution. See Supplemental Experimental Procedures for more information.
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