Two-dimensional gel analysis of secreted proteins induced by interleukin-1β in rat astrocytes

Julia W. Chang, Donald A. Young, Paul D. Coleman, M. Kerry O'Banion

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Interleukin-1β (IL-1β) is a pro-inflammatory cytokine produced in the brain by endogenous microglial cells responding to injury. Levels of IL-1β are elevated in several neurodegenerative disorders, including Alzheimer's disease. IL-1β, which can act as a mitogen for astrocytes, also elicits the expression and secretion of multiple factors and paracrine 'second messengers' such as other cytokines, nerve growth factor, prostaglandins and nitric oxide that may in turn modulate neuronal and glial responses to injury. Utilizing giant, high-resolution two-dimensional gel electrophoresis, we have sought to more fully define the potential range of protein mediators that are secreted by astrocytes treated with IL-1β. In cultured rat astrocytes, we observe dramatic increases in the secretion of eight different protein species after 24 h of treatment with human recombinant IL-1β (1 U/ml). Seven of the proteins are also induced by tumor necrosis factor-α or basic fibroblast growth factor. Based on immunoprecipitation with specific antisera, we have identified three of these proteins as plasminogen activator inhibitor type-1, ceruloplasmin, and complement component C3. The identities of the other proteins, including the IL-1β-specific induction, are currently unknown. Characterization of these downstream modulators of IL-1β action complements gene-based approaches and will provide a better understanding of astrocyte responses to injury as well as markers for astrocyte activation in neurodegenerative diseases.

Original languageEnglish (US)
Pages (from-to)349-359
Number of pages11
JournalNeurochemistry International
Volume39
Issue number5-6
DOIs
StatePublished - Oct 9 2001
Externally publishedYes

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Keywords

  • Alzheimer's disease
  • Basic fibroblast growth factor
  • C3 complement component
  • CNS injury
  • Ceruloplasmin
  • Plasminogen activator inhibitor type-1
  • Tumor necrosis factor-α
  • Two-dimensional gel electrophoresis

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Cell Biology

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