Activation of FAS receptor is required for the increased formation of the disialoganglioside GD3 in cultured cerebellar granule cells committed to apoptotic death

M. Castiglione, P. Spinsanti, L. Iacovelli, L. Lenti, F. Martini, R. Gradini, V. Di Giorgi Gerevini, A. Caricasole, A. Caruso, R. De Maria, F. Nicoletti, D. Melchiorri

Research output: Contribution to journalArticlepeer-review

Abstract

Apoptosis was induced in cultured cerebellar granule cells by lowering extracellular K+ concentrations (usually from 25 to 10 mM). The apoptotic phenotype was preceded by an early and transient increase in the intracellular levels of the disialoganglioside, GD3, which behaves as a putative pro-apoptotic factor. We examined whether activation of Fas receptor mediates the increase in GD3 formation in granule cells committed to die. Degenerating granule cells showed increased expression of both Fas receptor and its ligand (Fas-L), at times that coincided with the increase in GD3 levels and the induction of GD3 synthase mRNA. Addition of neutralizing anti-Fas-L antibodies reduced the extent of 'low-K+'-induced apoptosis and abolished the increase in GD3 levels and GD3 synthase mRNA. Similar reductions were observed in cultures prepared from gld or lpr mice, which harbor loss-of-function mutations of Fas-L and Fas receptor, respectively. In addition, exogenous application of soluble Fas-L further enhanced both the increase in GD3 formation and cell death in cultured granule cells switched from 25 into 10 mM K +. We conclude that activation of Fas receptor is entirely responsible for the increase in GD3 levels and contributes to the development of apoptosis by trophic deprivation in cultured cerebellar granule cells.

Original languageEnglish
Pages (from-to)889-898
Number of pages10
JournalNeuroscience
Volume126
Issue number4
DOIs
Publication statusPublished - 2004

Keywords

  • anti Fas-L antibodies
  • days in vitro
  • DIV
  • Fas ligand
  • Fas-L
  • GD3 synthase
  • gld and lpr mice
  • high performance thin layer chromatography
  • HPTLC
  • PBS
  • phosphate buffer saline
  • trophic deprivation

ASJC Scopus subject areas

  • Neuroscience(all)

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