Central and systemic Interleukin-1 exacerbates neurodegeneration and motor symptoms in a model of Parkinson ‘s disease

CLARA POTT-GODOY; RODOLFO TARELLI; CARINA FERRARI; MARÍA INÉS SARCHI; FERNANDO PITOSSI.

BRAIN

OXFORD UNIV PRESS

Año: 2008 vol. 131 p. 1880 - 1894

0006-8950

Parkinson’s disease is a neurodegenerative disorder with uncertain aetiology and ill-defined pathophysiology. Activated microglial cells in the substantia nigra (SN) are found in all animal models of Parkinson’s disease and patients with the illness.Microglia may, however, have detrimental and protective functions in this disease. In this study, we tested the hypothesis that a sub-toxic dose of an inflammogen (lipopolysaccharide) can shift microglia to a pro-inflammatory state and exacerbate disease progression in an animal model of Parkinson’s disease.Central lipopolysaccharide injection in a degenerating SNexacerbated neurodegeneration, accelerated and increased motor signs and shifted microglial activation towards a pro-inflammatory phenotype with increased interleukin-1b (IL-1b) secretion. Glucocorticoid treatment and specific IL-1 inhibition reversed these effects. Importantly, chronic systemic expression of IL-1 also exacerbated neurodegeneration and microglial activation in the SN. In vitro, IL-1 directly exacerbated 6-OHDA-triggered dopaminergic toxicity. In vivo, we found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression. found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression. effects. Importantly, chronic systemic expression of IL-1 also exacerbated neurodegeneration and microglial activation in the SN. In vitro, IL-1 directly exacerbated 6-OHDA-triggered dopaminergic toxicity. In vivo, we found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression. found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression. b (IL-1b) secretion. Glucocorticoid treatment and specific IL-1 inhibition reversed these effects. Importantly, chronic systemic expression of IL-1 also exacerbated neurodegeneration and microglial activation in the SN. In vitro, IL-1 directly exacerbated 6-OHDA-triggered dopaminergic toxicity. In vivo, we found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression. found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression. In vitro, IL-1 directly exacerbated 6-OHDA-triggered dopaminergic toxicity. In vivo, we found that nitric oxide was a downstreammolecule of IL-1 action and partially responsible for the exacerbation of neurodegeneration observed.Thus, IL-1 exerts its exacerbating effect on degenerating dopaminergic neurons by direct and indirect mechanisms.This work demonstrates an unequivocal association between IL-1 overproduction and increased disease progression, pointing to inflammation as a risk factor for Parkinson’s disease and suggesting that inflammation should be efficiently handled in patients to slow disease progression.