Activity deprivation induces neuronal cell death: mediation by tissue-type plasminogen activator

Spontaneous activity is an essential attribute of neuronal networks and plays a critical role in their development and maintenance. Upon blockade of activity with tetrodotoxin (TTX), neurons degenerate slowly and die in a manner resembling neurodegenerative diseases-induced neuronal cell death. The...

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Veröffentlicht in:PloS one 2011-10, Vol.6 (10), p.e25919
Hauptverfasser: Schonfeld-Dado, Eldi, Segal, Menahem
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description Spontaneous activity is an essential attribute of neuronal networks and plays a critical role in their development and maintenance. Upon blockade of activity with tetrodotoxin (TTX), neurons degenerate slowly and die in a manner resembling neurodegenerative diseases-induced neuronal cell death. The molecular cascade leading to this type of slow cell death is not entirely clear. Primary post-natal cortical neurons were exposed to TTX for up to two weeks, followed by molecular, biochemical and immunefluorescence analysis. The expression of the neuronal marker, neuron specific enolase (NSE), was down-regulated, as expected, but surprisingly, there was a concomitant and striking elevation in expression of tissue-type plasminogen activator (tPA). Immunofluorescence analysis indicated that tPA was highly elevated inside affected neurons. Transfection of an endogenous tPA inhibitor, plasminogen activator inhibitor-1 (PAI-1), protected the TTX-exposed neurons from dying. These results indicate that tPA is a pivotal player in slowly progressing activity deprivation-induced neurodegeneration.
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subjects Analysis
Animals
Apoptosis
Biochemistry
Biology
Cell death
Cell Death - drug effects
Cell Survival - drug effects
Deprivation
Down-Regulation - drug effects
Experiments
Growth factors
Immunofluorescence
Inhibitors
Ischemia
Localization
Mediation
Medicine
Mortality
Nervous system
Nervous system diseases
Neural networks
Neurobiology
Neurodegeneration
Neurodegenerative diseases
Neurological diseases
Neurons
Neurons - cytology
Neurons - drug effects
Neurons - metabolism
Neurosciences
Neurotoxicity
Neurotoxins - toxicity
Phosphopyruvate hydratase
Phosphopyruvate Hydratase - genetics
Plasminogen activator inhibitors
Polyamide-imides
Proteins
Rats
Rats, Wistar
t-Plasminogen activator
Tetrodotoxin
Tetrodotoxin - toxicity
Tissue plasminogen activator
Tissue Plasminogen Activator - genetics
Tissue Plasminogen Activator - metabolism
Transfection
Tumor necrosis factor-TNF
Up-Regulation - drug effects
title Activity deprivation induces neuronal cell death: mediation by tissue-type plasminogen activator
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