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Neurotrophins regulate the function of cultured microglia
K Nakajima1, Y Kikuchi, E Ikoma
1Department of Neurochemistry, National Institute of Neuroscience, Kodaira, Tokyo, Japan.
Glia
|October 17, 1998
Summary
Neurotrophins regulate microglial function by influencing enzyme secretion and nitric oxide release. These effects are mediated through Trk and LNGFRp75 receptors, impacting glial cell physiology.
Area of Science:
- Neuroscience
- Cell Biology
- Immunology
Background:
- Neurotrophins are crucial for neuronal development and survival.
- The role of neurotrophins in glial cell physiology, particularly microglia, is not well understood.
Purpose of the Study:
- To investigate the effects of neurotrophins on cultured rat microglia.
- To elucidate the signaling pathways involved in neurotrophin-microglia interactions.
Main Methods:
- Primary microglia cultures from newborn rat brains were used.
- Neurotrophin treatment, enzyme activity assays, nitric oxide measurements, RT-PCR, immunocytochemistry, and Western blotting were performed.
- Protein kinase inhibitor K252a and transcription factor NF-kappaB activation were assessed.
Main Results:
- Neurotrophins (NGF, BDNF, NT-3, NT-4) increased plasminogen activator secretion and acid phosphatase activity.
- Neurotrophins suppressed nitric oxide release from microglia.
- Microglia express Trk A, B, C, and LNGFRp75 receptors.
- Neurotrophins activated Trk A/B phosphorylation and NF-kappaB, indicating receptor-mediated signaling.
Conclusions:
- Neurotrophins modulate microglial function through Trk and/or LNGFRp75 signaling pathways.
- This study reveals a novel role for neurotrophins in regulating glial cell responses.