Send to

Choose Destination
Nat Neurosci. 2009 Apr;12(4):454-62. doi: 10.1038/nn.2289. Epub 2009 Mar 22.

Phosphodiesterase 1C is dispensable for rapid response termination of olfactory sensory neurons.

Author information

Department of Biology, the Johns Hopkins University, Baltimore, Maryland, USA.


In the nose, odorants are detected on the cilia of olfactory sensory neurons (OSNs), where a cAMP-mediated signaling pathway transforms odor stimulation into electrical responses. Phosphodiesterase (PDE) activity in OSN cilia has long been thought to account for rapid response termination by degrading odor-induced cAMP. Two PDEs with distinct cellular localization have been found in OSNs: PDE1C in the cilia and PDE4A throughout the cell but absent from the cilia. We disrupted both of these genes in mice and carried out electro-olfactogram analysis. Unexpectedly, eliminating PDE1C did not prolong response termination. Prolonged termination occurred only in mice that lacked both PDEs, suggesting that cAMP degradation by PDE1C in cilia is not a rate-limiting factor for response termination in wild-type mice. Pde1c(-/-) OSNs instead showed reduced sensitivity and attenuated adaptation to repeated stimulation, suggesting that PDE1C may be involved in regulating sensitivity and adaptation. Our observations provide new perspectives on the regulation of olfactory transduction.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center