Science and Education Publishing American Journal of Pharmacological Sciences 1 5 2013 12 16 Role of Matrix Metalloproteinases (MMPs) and MMP Inhibitors on Intracranial Aneurysms (A Review Article) 100 103 EN Azam Maradni Seyed Hasan Emamirazavi Abbas Noruzi-javidan Seyed Hamzeh Mousavi Alireza Khoshnevisan Brain and spinal injury repair research center (BASIR), Department of neurosurgery, Tehran University of Medical Sciences, Tehran, Iran AJPS2013156 10.12691/ajps-1-5-6 2012 12 10 2013 09 22 2013 12 16 Cerebrovascular disease is one of the leading causes of death in the world, and about one-fourth of cerebrovascular deaths are due to ruptured cerebral aneurysms (CA). Accordingly it is important to find a way to reduce aneurysm formation and its subsequent morbidity and mortality. Proteolytic activity capable of lysing gelatin has been shown to be increased in aneurysm tissue and expression of plasmin, membrane-type matrix metalloproteinase-1(MT1-MMP), and matrix metalloproteinase-2 (MMP-2) in aneurysmal wall is more than what we observe in normal cerebral arteries. This activity may induce focal degradation of the vascular extracellular matrix and may contribute to aneurysm formation and growth. MMPs are important in tissue remodeling associated with various physiological and pathological processes such as morphogenesis, angiogenesis, apoptosis and tissue repair. in this paper we review the role of MMPs in aneurysm formation.