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Granzyme A (GrA) is a lymphocyte serine protease that is believed to enter virus-infected cells and growing tumors and induce apoptosis. We found recently that recombinant rat GrA (rGrA) promotes detachment of and interleukin (IL)-8 release from alveolar epithelial A549 cells and suggested that this protease is involved in the pathogenesis of certain inflammatory lung diseases. In the present study, we found that lambda-carrageenan (a sulfated oligosaccharide constituting the cell walls of seaweeds) potently inhibits rGrA-induced detachment and IL-8 release of A549 cells. This sulfated oligosaccharide might be useful for suppressing the development of inflammatory lung diseases in which GrA is thought to be involved.

Carrageenan inhibits granzyme A-induced detachment of and interleukin-8 release from alveolar epithelial A549 cells