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Published on: October 14, 2012
Myelin basic protein (MBP) and MBP peptides are mitogens for cultured astrocytes
S A South1, G E Deibler, S F Tzeng
1Research Service, Hines VA Hospital, Hines, IL 60141, USA.
Myelin basic protein (MBP) fragments stimulate astrocyte proliferation after CNS demyelination. Specific MBP regions interact with fibroblast growth factor receptor (FGFR) and ganglioside GM(1), potentiated by microglial factors, contributing to astrogliosis.
Area of Science:
- Neuroscience
- Cell Biology
- Regenerative Medicine
Background:
- Astrogliosis, characterized by astrocyte proliferation, impedes axonal regeneration and remyelination following central nervous system (CNS) demyelination.
- Myelin basic protein (MBP) is a key component of myelin and its breakdown products may influence the glial response to injury.
Purpose of the Study:
- To investigate the role of myelin basic protein (MBP) in stimulating astrocyte proliferation after CNS demyelination.
- To identify specific regions of MBP responsible for mitogenic activity and elucidate the underlying molecular mechanisms.
Main Methods:
- Primary astrocyte cultures were treated with MBP and its peptide fragments in various media conditions.
- Assays included proliferation measurements, inhibition studies with suramin (FGFR inhibitor) and cholera toxin B (GM(1) binder), and intracellular calcium imaging.
Main Results:
- MBP induced astrocyte proliferation, with mitogenic activity localized to MBP(1-44), MBP(88-151), and MBP(152-167) peptide fragments.
- Microglia-conditioned media potentiated the mitogenic effects of these MBP fragments.
- Suramin inhibited MBP-induced proliferation, implicating fibroblast growth factor receptor (FGFR) signaling.
- Cholera toxin B selectively inhibited the mitogenicity of MBP(1-44), suggesting interaction with ganglioside GM(1).
- MBP(1-44) caused a sustained increase in intracellular calcium, while MBP(152-167) induced a modest, transient elevation.
Conclusions:
- Specific MBP peptide fragments are mitogenic for astrocytes, playing a potential role in astrogliosis post-demyelination.
- FGFR and extracellular calcium are critical for MBP-induced astrocyte proliferation.
- MBP(1-44) and MBP(152-167) interact with distinct cellular targets (GM(1) and FGFR, respectively).
- Factors secreted by microglia enhance the mitogenic potential of MBP fragments, supporting a combined role in vivo.
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