Activity-dependent genes in mouse olfactory sensory neurons.
Level 5 - mechanism / opinion, no new human data
Bench and animal research without human data
PubMed 24692514 · doi:10.1093/chemse/bju015
What was done
The authors investigated activity-dependent gene expression in mouse olfactory sensory neurons (OSNs) using two sensory deprivation models: 6 days of unilateral naris occlusion and genetic silencing of OSNs. They also tested acute transcriptional responses after 30–40 minutes of odor stimulation, and evaluated total OSN numbers, stress-response mRNAs, and odorant receptor (OR) mRNA variability.
What was found
Both 6-day naris occlusion and genetic silencing decreased levels of S100A5, Lrrc3b, Kirrel2, Slc17a6, Rasgrp4, Pcp4l1, Plcxd3, and Kcnn2, while increasing Kirrel3. Naris occlusion additionally decreased Eml5, Ptprn, and Nphs1. Total OSN number and stress-response mRNAs remained unchanged after 6 days. Short-term (30–40 min) odor stimulation increased only 3 of the 11 mRNAs (S100A5, Lrrc3b, Kirrel2). Olfr855 mRNA consistently decreased, whereas overall OR mRNAs were highly variable. Specific quantitative values and effect sizes were not reported in the abstract.
Why it matters
This work identifies specific activity-dependent transcripts in mammalian olfactory neurons and indicates that most transcriptional adjustments occur slowly or indirectly, requiring a week or more from odor cessation to influence neuronal survival pathways.
Limits
The study is restricted to juvenile mice without human validation. The abstract omits sample sizes (n), numeric values, fold-changes, and statistical confidence intervals, and long-term functional survival endpoints were not directly quantified.
Cited by
- supports The turnover and sensory tuning of olfactory neurons is activity-dependent, requiring electrical firing generated by sniffing and odor exposure.