MMP2  is a 72 kDa enzymatic protein and  it belongs to matrix metalloproteinases (MMPs), a heterogenous family of zinc/calcium-dependent  TIMPs (tissue inhibitors of matrix metalloproteinases) regulated matrix-degrading  endopeptidases which are classified into collagenases (MMP-1, -8, -13, -18),  gelatinases (MMP-2, -9), stromelysins (MMP-3, -7, -10, -11), elastase (MMP-12),  and membrane-type matrix metalloproteinases (MT-MMP-1 through -5) (1). MMP2 involves  in extracellular matrix metabolism and cleaves type IV collagen along with  degrading the already denatured collagens.