PF-543 (1706522-79-3) is a potent (IC50 = 2.0 nM) and selective (>100-fold over SphK2) reversible inhibitor of sphingosine kinase-1 (SphK1).1 It induced autophagy in head and neck squamous cell carcinoma cells.2 PF-543 mitigated pulmonary fibrosis via re
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