- MMP-9 in B-cell chronic lymphocytic leukemia is up-regulated by {alpha}4beta1 integrin or CXCR4 engagement via distinct signaling pathways, localizes to podosomes, and is involved in cell invasion and migration. Redondo-Mu??oz, J., Escobar-D??az, E., Samaniego, R., Terol, M.J., Garc??a-Marco, J.A., Garc??a-Pardo, A. Blood (2006)