Related Experiment Videos
Factors regulating neurogenesis and programmed cell death in mouse olfactory epithelium
A L Calof1, P C Rim, K J Askins
1Department of Anatomy & Neurobiology, University of California, Irvine, College of Medicine 92697-1275, USA. alcalof@uci.edu
Annals of the New York Academy of Sciences
|February 4, 1999
Summary
Neurogenesis in the mouse olfactory epithelium (OE) is regulated by factors including differentiated olfactory receptor neurons (ORNS). Bulbectomy-induced ORN death releases this inhibition, promoting OE neurogenesis.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- The olfactory epithelium (OE) contains stem cells that generate olfactory receptor neurons (ORNS).
- Understanding the regulation of neurogenesis and cell death in the OE is crucial for olfactory system maintenance.
Purpose of the Study:
- To identify factors regulating neurogenesis and programmed cell death in mouse OE.
- To elucidate the mechanisms underlying these regulatory processes.
Main Methods:
- Tissue culture of embryonic OE and isolated cell types.
- In vivo studies using olfactory bulbectomy in adult mice to induce ORN death and subsequent neurogenesis.
Main Results:
- Identified multiple proliferating neuronal progenitor cell stages in the ORN lineage.
- Discovered that differentiated ORNs produce an inhibitory signal affecting progenitor neurogenesis.
- Demonstrated that ORN death releases this inhibition, leading to increased OE neurogenesis.
Conclusions:
- The number of ORNs in the OE is regulated at multiple progenitor cell stages.
- A negative feedback loop exists where differentiated ORNs inhibit their own progenitors' neurogenesis.
- This feedback mechanism is critical for maintaining OE homeostasis and olfactory function.