Where indicated, BMDMs were transduced with either a control vector, wild-type human MMP9, a catalytically inactive MMP9 E402/A mutant (Orgaz et al., 2014 (link)), wild-type human MMP14, a catalytically inactive MMP14 E240/A mutant expression vector (Shimizu-Hirota et al., 2012 (link)), or a constitutively active human RhoA L63 expression vector (RTV-204; Cell Biolabs). The MMP9 and MMP14 constructs were cloned into the pLentilox-IRES-GFP lentiviral vector, while the RhoA constructs were inserted into pBABEhygro retroviral vector. Expression of the recombinant proteins was confirmed by Western blot.