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Noggin is a negative regulator of neuronal differentiation in developing neocortex
1Department of Physiology and Neurobiology, University of Connecticut, Storrs, Conn., USA.
Developmental Neuroscience
|February 5, 2000
Summary
Noggin inhibits the differentiation of neocortical neurons by blocking bone morphogenetic proteins (BMPs). This study shows noggin affects neuronal differentiation, not proliferation or survival, in developing brain tissue.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Bone morphogenetic proteins (BMPs) are known to induce neuronal differentiation in the neocortical ventricular zone (VZ).
- BMP-2/4 protein is localized at the VZ surface and promotes neocortical precursor differentiation.
- Noggin is a high-affinity BMP-2/4 binding protein that inhibits BMP signaling.
Purpose of the Study:
- To investigate the role of endogenous BMP-2/4 in triggering neuronal differentiation.
- To determine the effect of noggin on neocortical precursor differentiation in dissociated cell cultures.
Main Methods:
- Treatment of dissociated neocortical cell cultures with human recombinant noggin protein.
- Assessment of neuronal differentiation markers (MAP-2, TUJ1) and cell proliferation/survival.
- Western blot analysis to detect noggin protein presence in developing cortex.
Main Results:
- Noggin significantly inhibited the differentiation of neocortical neurons, reducing MAP-2 and TUJ1 positive cells.
- Noggin treatment did not affect cell proliferation or survival.
- Noggin also decreased neurite outgrowth in MAP-2 positive neurons.
- Noggin protein was detected in the developing cortex at embryonic day 15 (E15).
Conclusions:
- Endogenous BMPs are confirmed to trigger neuronal differentiation in the neocortical VZ.
- A balance between noggin and BMP signaling likely regulates neocortical neuron differentiation in vivo.
- Noggin plays a critical role in modulating BMP-induced neuronal differentiation and neurite growth.