Astrocytic production of nerve growth factor in motor neuron apoptosis: Implications for amyotrophic lateral sclerosis

Mariana Pehar, Patricia Cassina, Marcelo R. Vargas, Raquel Castellanos, Liliana Viera, Joseph S. Beckman, Alvaro G. Estévez, Luis Barbeito

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

192 Citas (Scopus)


Reactive astrocytes frequently surround degenerating motor neurons in patients and transgenic animal models of amyotrophic lateral sclerosis (ALS). We report here that reactive astrocytes in the ventral spinal cord of transgenic ALS-mutant G93A superoxide dismutase (SOD) mice expressed nerve growth factor (NGF) in regions where degenerating motor neurons expressed p75 neurotrophin receptor (p75NTR) and were immunoreactive for nitrotyrosine. Cultured spinal cord astrocytes incubated with lipopolysaccharide (LPS) or peroxynitrite became reactive and accumulated NGF in the culture medium. Reactive astrocytes caused apoptosis of embryonic rat motor neurons plated on the top of the monolayer. Such motor neuron apoptosis could be prevented when either NGF or p75NTR was inhibited with blocking antibodies. In addition, nitric oxide synthase inhibitors were also protective. Exogenous NGF stimulated motor neuron apoptosis only in the presence of a low steady state concentration of nitric oxide. NGF induced apoptosis in motor neurons from p75NTR +/+ mouse embryos but had no effect in p75NTR-/- knockout embryos. Culture media from reactive astrocytes as well as spinal cord lysates from symptomatic G93A SOD mice-stimulated motor neuron apoptosis, but only when incubated with exogenous nitric oxide. This effect was prevented by either NGF or p75NTR blocking-antibodies suggesting that it might be mediated by NGF and/or its precursor forms. Our findings show that NGF secreted by reactive astrocytes induce the death of p75-expressing motor neurons by a mechanism involving nitric oxide and peroxynitrite formation. Thus, reactive astrocytes might contribute to the progressive motor neuron degeneration characterizing ALS.

Idioma originalInglés
Páginas (desde-hasta)464-473
Número de páginas10
PublicaciónJournal of Neurochemistry
EstadoPublicada - 1 abr. 2004

Áreas temáticas de ASJC Scopus

  • Bioquímica
  • Neurociencia celular y molecular


Profundice en los temas de investigación de 'Astrocytic production of nerve growth factor in motor neuron apoptosis: Implications for amyotrophic lateral sclerosis'. En conjunto forman una huella única.

Citar esto