Reagents included ammonium iron(III) citrate (FAC) (Sigma Aldrich, F5879), 2,2-bipyridyl (Sigma Aldrich, 366-18-7), 4,4-bipyridyl (Sigma Aldrich, 533-26-4) and BAPTA-AM (Invitrogen, B6769). Trans-Ned19 (Ned19) and a cell-permeant version of NAADP (NAADP-AM) were synthesized as previously described [24 (link), 25 (link)] and used at a final concentration of 1 μM (Ned19) or 100 nM (NAADP-AM) for 12 h. The TRPML compounds ML-SA1, MK6-83, EVP21, and EVP22 have been previously described [26 (link)–29 ] and were employed at a final concentration of 5 μM for 12 h.
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