Cited by 481

Tumor necrosis factor-alpha production by astrocytes. Induction by lipopolysaccharide, IFN-gamma, and IL-1 beta.

Chung, I Y, Benveniste, E N·1990·The Journal of Immunology

Abstract

Astrocytes have the capacity to secrete or respond to a variety of cytokines including IL-1, IL-6, IL-3, and TNF-alpha. In this study, we have examined the capacity of astrocytes to secrete TNF-alpha in response to a variety of biologic stimuli, particularly cytokines such as IL-1 and IFN-gamma, which are known to be present in the central nervous system during neurologic diseases associated with inflammation. Rat astrocytes do not constitutively produce TNF-alpha, but have the ability to secrete TNF-alpha in response to LPS, and can be primed by IFN-gamma to respond to a suboptimal dose of LPS. IFN-gamma and IL-1 beta alone do not induce TNF-alpha production, however, the combined treatment of IFN-gamma and IL-1 beta results in a striking synergistic effect on astrocyte TNF-alpha production. Astrocyte TNF-alpha protein production induced by a combined treatment of either IFN-gamma/LPS or IFN-gamma/IL-1 beta occurs in a dose- and time-dependent manner, and appears to require a "priming signal" initiated by IFN-gamma, which then renders the astrocyte responsive to either a suboptimal dose of LPS or IL-1 beta. Astrocyte TNF-alpha production by IFN-gamma/LPS stimulation can be inhibited by the addition of anti-rat IFN-gamma antibody, whereas IFN-gamma/IL-1-induced TNF-alpha production is inhibited by antibody to either IFN-gamma or IL-1 beta. Polyclonal antisera reactive with mouse macrophage-derived TNF-alpha neutralized the cytotoxicity of IFN-gamma/LPS and IFN-gamma/IL-1 beta-induced astrocyte TNF-alpha, demonstrating similarities between these two sources of TNF-alpha. We propose that astrocyte-produced TNF-alpha may have a pivotal role in augmenting intracerebral immune responses and inflammatory demyelination due to its diverse functional effects on glial cells such as oligodendrocytes and astrocytes themselves.

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Crossref · 10.4049/jimmunol.144.8.2999

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Authors
Chung, I. Y., & Benveniste, E. N.
Affiliations
  • Department of Cell Biology and Anatomy, University of Alabama at Birmingham , Birmingham, AL 35294
  • Department of Neurology, University of Alabama at Birmingham , Birmingham, AL 35294
Venue
The Journal of Immunology
Published
1990-04
Volume
144
Issue
8
Pages
2999-3007
ISSN
  • 0022-1767
  • 1550-6606
Cited by
481
References
0
Language
en

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