MMP9 and Miyoshi myopathy: Thus, CSL induced downregulation of CXCR4 and MMP-9 may explain the underlying mechanism behind the ability of CSL to inhibit the CXCL12 induced migration and invasion of MM cells and can also be attributed to the downregulation of NF-κB activation by CSL as reported previously by our group (Kannaiyan et al., 2011a).