BMPs inhibit neurogenesis by a mechanism involving degradation of a transcription factor
Related Experiment Video
Updated: Oct 12, 2026
Methods for the Modulation and Analysis of NF-κB-dependent Adult Neurogenesis
Published on: February 13, 2014
1Department of Anatomy & Neurobiology and the Developmental Biology Center, University of California Irvine, College of Medicine, 92697-1275, USA.
Abstract:
Bone morphogenetic proteins (BMPs), negative regulators of neural determination in the early embryo, were found to be potent inhibitors of neurogenesis in olfactory epithelium (OE) cultures. BMPs 2, 4 or 7 decreased the number of proliferating progenitor cells and blocked production of olfactory receptor neurons (ORNs). Experiments suggested that this effect was due to an action of BMPs on an early-stage progenitor in the ORN lineage. Further analysis revealed that progenitors exposed to BMPs rapidly (< 2 h) lost MASH1, a transcription factor known to be required for the production of ORNs. This disappearance was due to proteolysis of existing MASH1 protein, but new gene expression was required to trigger it. The data suggest a novel mechanism of BMP action, whereby the induced degradation of an essential transcription factor results in premature termination of a neuronal lineage.
Insights
Bone morphogenetic proteins (BMPs) inhibit neurogenesis in olfactory epithelium cultures by decreasing progenitor cells and blocking olfactory receptor neuron (ORN) production. This occurs via rapid MASH1 protein degradation, terminating neuronal lineage development.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Bone morphogenetic proteins (BMPs) are known negative regulators of early embryonic neural determination.
- Neurogenesis, the process of generating new neurons, is crucial for sensory organ development.
Purpose of the Study:
- To investigate the role of BMPs in neurogenesis within the olfactory epithelium (OE).
- To elucidate the molecular mechanism by which BMPs affect olfactory receptor neuron (ORN) production.
Main Methods:
- Culturing olfactory epithelium (OE) cells.
- Treating cultures with BMPs (2, 4, or 7).
- Quantifying progenitor cell proliferation and ORN production.
- Analyzing MASH1 transcription factor levels and degradation pathways.
Main Results:
- BMPs significantly reduced proliferating progenitor cells and blocked ORN production in OE cultures.
- BMPs acted on early-stage progenitors within the ORN lineage.
- Exposure to BMPs led to rapid (< 2 hours) loss of the MASH1 transcription factor.
- MASH1 loss was mediated by proteolysis, triggered by new gene expression.
Conclusions:
- BMPs are potent inhibitors of neurogenesis in the olfactory epithelium.
- BMPs induce premature termination of the ORN lineage through proteolysis-dependent MASH1 degradation.
- This represents a novel mechanism of BMP action regulating neuronal development.
