Calcineurin inhibition enhances motor neuron survival following injury

The immunosuppressive agents cyclosporin A (CsA) and FK‐506 have previously been shown to exhibit neurotrophic and neuroprotective properties in vivo. Given that significant clinical expertise exists for both drugs, they represent an attractive starting point for treatment of acute neural injuries....

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Veröffentlicht in:Journal of cellular and molecular medicine 2010-03, Vol.14 (3), p.671-686
Hauptverfasser: Hui, Kelvin K.W., Liadis, Nicole, Robertson, Jennifer, Kanungo, Anish, Henderson, Jeffrey T.
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creator Hui, Kelvin K.W.
Liadis, Nicole
Robertson, Jennifer
Kanungo, Anish
Henderson, Jeffrey T.
description The immunosuppressive agents cyclosporin A (CsA) and FK‐506 have previously been shown to exhibit neurotrophic and neuroprotective properties in vivo. Given that significant clinical expertise exists for both drugs, they represent an attractive starting point for treatment of acute neural injuries. One putative mechanism for neuroprotection by these drugs relates to inhibition of calcineurin activity. However each drug–immunophilin complex can potentially influence additional signal transduction pathways. Furthermore, several non‐immunosuppressive immunophilin ligands have been described as possessing neuroprotective properties, suggesting that neuroprotection may be separable from calcineurin inhibition. In the present study, we examined the mechanism of this neuroprotection in facial motor neurons following axotomy‐induced injury. Similar to previous studies in rats, CsA and FK‐506 enhanced motor neuron survival in mice following acute injury. To examine the mechanism responsible for neuroprotection by these agents, pharmacologic inhibitors of several potential alternate signalling pathways (17‐(allylamino)‐17‐demethoxygeldanamycin, rapamycin, cypermethrin) were evaluated with respect to neuroprotection. Of these, only cypermethrin, a direct calcineurin inhibitor not previously associated with neuronal survival properties, was observed to significantly enhance motor neuron survival following injury. The results demonstrate for the first time that direct inhibition of calcineurin is neuroprotective in vivo. These data support a model in which calcineurin inhibition promotes neuronal survival, distinct from effects upon neurite outgrowth.
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To examine the mechanism responsible for neuroprotection by these agents, pharmacologic inhibitors of several potential alternate signalling pathways (17‐(allylamino)‐17‐demethoxygeldanamycin, rapamycin, cypermethrin) were evaluated with respect to neuroprotection. Of these, only cypermethrin, a direct calcineurin inhibitor not previously associated with neuronal survival properties, was observed to significantly enhance motor neuron survival following injury. The results demonstrate for the first time that direct inhibition of calcineurin is neuroprotective in vivo. 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subjects Animals
Animals, Newborn
Apoptosis
Axonogenesis
Axotomy
Calcineurin - genetics
Calcineurin Inhibitors
Caspase 3 - metabolism
Cell Survival - drug effects
Cyclosporin A
Cyclosporine - pharmacology
Cypermethrin
Cytochrome
Drug therapy
Drugs
Enzyme Activation - drug effects
facial nerve
Immunohistochemistry
immunophilin ligands
Immunosuppressive agents
Immunosuppressive Agents - pharmacology
Insecticides - pharmacology
Laboratories
Mice
Mice, Inbred ICR
Mice, Inbred Strains
Mice, Knockout
Microscopy, Fluorescence
Motor neurons
Motor Neurons - drug effects
Motor Neurons - metabolism
Motor Neurons - pathology
neuronal survival
Neurons
Neuroprotection
Neuroprotective Agents - pharmacology
Pharmaceuticals
Pharmacology
Phosphatase
Phosphorylation
programmed cell death
Proteins
Pyrethrins - pharmacology
Rapamycin
Rodents
Signal transduction
Signal Transduction - drug effects
Tacrolimus
Tacrolimus - pharmacology
title Calcineurin inhibition enhances motor neuron survival following injury
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