IL-21 is highly produced in Helicobacter pylori-infected gastric mucosa and promotes gelatinases synthesis - Caruso, R; Fina, D; Peluso, I; Fantini, M C; Tosti, C; Blanco, G DV; Paoluzi, O A; Caprioli, F; Andrei, F; Stolfi, C; Romano, M; Ricci, V; MacDonald, T T; Pallone, F; Monteleone, G (J Immunol, 2007)