IL1B and Salla disease: Dysregulated production of IL-1β was dependent upon caspase activity but not cathepsin B. We investigated the role of IL-1β in SD pathology using two approaches: the creation of hexb−/−Il1r1−/− double knockout mice or by treating hexb−/− animals with anakinra, a recombinant form of the IL-1 receptor antagonist, IL-1Ra.