ADP-heptose-induced cytokine secretion is ALPK1-dependent. HeLa cells were transfected with control or ALPK1-targeting siRNAs and infected with wt S. flexneri (MOI 2) or treated with ADP-heptose (10-5 M). As control, cells were left untreated (mock) or treated with digitonin. Cytokines were measured in cell culture supernatants after 8 h 