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Complement component anaphylatoxins upregulate chemokine expression by human astrocytes
Anne-Christine Jauneau1, Alexander Ischenko, Philippe Chan
1Institut Fédératif de Recherche Multidisciplinaire sur les Peptides No. 23, INSERM U519, Faculté Mixte de Médecine et de Pharmacie, 22 Boulevard Gambetta, 76183 Rouen Cedex, France. acjauneau@hotmail.com
FEBS Letters
|February 28, 2003
Summary
Anaphylatoxins, immune system components, increase brain cell chemokine mRNA. Their role in interleukin-8 secretion requires interleukin-1beta, suggesting involvement in brain disorder pathogenesis.
Area of Science:
- Neuroimmunology
- Innate Immunity
Background:
- The complement (C) system is a key part of innate immunity.
- Complement activation releases anaphylatoxins, which are proinflammatory polypeptides.
- Anaphylatoxin receptors are present on brain cells, suggesting a role in neurological processes.
Purpose of the Study:
- To investigate the effect of anaphylatoxins on chemokine expression in human astrocytes.
- To understand the role of anaphylatoxins in initiating inflammatory cascades within the brain.
Main Methods:
- Studied human astrocytes.
- Measured chemokine mRNA expression following anaphylatoxin stimulation.
- Assessed interleukin-8 secretion in the presence and absence of interleukin-1beta.
Main Results:
- Anaphylatoxins significantly increased chemokine mRNA expression in astrocytes.
- Anaphylatoxin-induced secretion of interleukin-8 was dependent on the presence of interleukin-1beta.
- This suggests a conditional inflammatory response in the brain.
Conclusions:
- Anaphylatoxins can initiate a chemokine cascade in the brain.
- This cascade, particularly interleukin-8 secretion, is modulated by interleukin-1beta.
- Anaphylatoxins may contribute to the pathogenesis of brain disorders.