Thapsigargin (67526-95-8) is a potent inhibitor of sarco-endoplasmic reticulum Ca2+ -ATPase1. (IC50= 30 nM) Induces endoplasmic reticulum stress and autophagy in a variety of cell lines2. Warning: Thapsigargin is highly irritating to skin and mucus membranes.
1) Treiman et al. (1998), A tool coming of age: thapsigargin as an inhibitor of sarco-endoplasmic reticulum Ca(2+)-ATPases; Trends Pharmacol. Sci., 19 131
2) Zhou et al. (2009), Autophagy-mediated insulin receptor down-regulation contributes to endoplasmic reticulum stress-induced insulin resistance; Mol. Pharmacol., 76 596