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http://dx.doi.org/10.4062/biomolther.2007.15.1.016

Beyond Clot Dissolution; Role of Tissue Plasminogen Activator in Central Nervous System  

Kim, Ji-Woon (Department of Pharmacology, School of Medicine)
Lee, Soon-Young (Department of Pharmacology, College of Pharmacy, Seoul National University)
Joo, So-Hyun (Department of Pharmacology, School of Medicine,)
Song, Mi-Ryoung (Molecular Cellular and Developmental Biology, The Salk Institute)
Shin, Chan-Young (Department of Pharmacology, School of Medicine,Center for Geriatric Neuroscience Research, Institute of Biomedical Science and Technology, Konkuk University)
Publication Information
Biomolecules & Therapeutics / v.15, no.1, 2007 , pp. 16-26 More about this Journal
Abstract
Tissue plasminogen activator (tPA) is a serine protease catalyzing the proteolytic conversion of plasminogen into plasmin, which is involved in thrombolysis. During last two decades, the role of tPA in brain physiology and pathology has been extensively investigated. tPA is expressed in brain regions such as cortex, hippocampus, amygdala and cerebellum, and major neural cell types such as neuron, astrocyte, microglia and endothelial cells express tPA in basal status. After strong neural stimulation such as seizure, tPA behaves as an immediate early gene increasing the expression level within an hour. Neural activity and/or postsynaptic stimulation increased the release of tPA from axonal terminal and presumably from dendritic compartment. Neuronal tPA regulates plastic changes in neuronal function and structure mediating key neurologic processes such as visual cortex plasticity, seizure spreading, cerebellar motor learning, long term potentiation and addictive or withdrawal behavior after morphine discontinuance. In addition to these physiological roles, tPA mediates excitotoxicity leading to the neurodegeneration in several pathological conditions including ischemic stroke. Increasing amount of evidence also suggest the role of tPA in neurodegenerative diseases such as Alzheimer's disease and multiple sclerosis even though beneficial effects was also reported in case of Alzheimer's disease based on the observation of tPA-induced degradation of $A{\beta}$ aggregates. Target proteins of tPA action include extracellular matrix protein laminin, proteoglycans and NMDA receptor. In addition, several receptors (or binding partners) for tPA has been reported such as low-density lipoprotein receptor-related protein (LRP) and annexin II, even though intracellular signaling mechanism underlying tPA action is not clear yet. Interestingly, the action of tPA comprises both proteolytic and non-proteolytic mechanism. In case of microglial activation, tPA showed non-proteolytic cytokine-like function. The search for exact target proteins and receptor molecules for tPA along with the identification of the mechanism regulating tPA expression and release in the nervous system will enable us to better understand several key neurological processes like teaming and memory as well as to obtain therapeutic tools against neurodegenerative diseases.
Keywords
synaptic plasticity; ECM; dendrite; neurotoxicity; Alzheimer's disease; ischemia;
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