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Interleukin-1beta stimulates galectin-9 expression in human astrocytes
H Yoshida1, T Imaizumi, M Kumagai
1Departments of Vascular Biology, Hirosaki University School of Medicine, 5 Zaifu-cho, Hirosaki 036-8562, Japan.
Neuroreport
|December 1, 2001
Summary
Astrocytes produce galectin-9, a molecule involved in inflammation, when stimulated by Interleukin-1 beta (IL-1β). This finding suggests a role for astrocytes in central nervous system (CNS) inflammatory responses.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Galectin-9 is known as an eosinophil chemoattractant produced by activated T lymphocytes.
- Astrocytes, the primary glial cells in the central nervous system (CNS), play crucial roles in brain function and inflammation.
Purpose of the Study:
- To investigate the expression of galectin-9 in normal human astrocytes in culture.
- To determine the regulatory factors influencing galectin-9 production by astrocytes.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) for mRNA analysis.
- Western blotting and immunofluorescent staining for protein detection and localization.
- Stimulation with Interleukin-1 beta (IL-1β) and dexamethasone to assess regulatory effects.
Main Results:
- Astrocytes express galectin-9 mRNA and protein.
- Interleukin-1 beta (IL-1β) significantly enhances galectin-9 expression in a time- and concentration-dependent manner.
- Dexamethasone pretreatment effectively suppresses galectin-9 production.
- Galectin-9 protein is localized in the membrane fraction with diffuse cellular and perinuclear distributions.
Conclusions:
- Normal human astrocytes produce galectin-9 upon stimulation with IL-1β.
- The expression of galectin-9 by astrocytes may contribute to inflammatory processes within the CNS.
- These findings highlight a novel role for astrocytes in neuroinflammation.