期刊
JOURNAL OF NEUROSCIENCE
卷 29, 期 10, 页码 3067-3072出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.6187-08.2009
关键词
-
资金
- Institut National de la Sante et de la Recherche Medicale
- Ministere de l'Education Nationale
- de la Recherche et de la Technologie [NIC0025]
- Centre National de la Recherche Scientifique
- Fondation pour la Recherche Medicale [ICP20001222128, FDT20070910324]
- Region Ile de France
- Fondation Bettancourt Schueller
- Human Frontier Science Program Organization
- Association Francaise contre les Myopathies [12411]
Adaptation is a general property of sensory receptor neurons and has been extensively studied in isolated cell preparation of olfactory receptor neurons. In contrast, little is known about the conditions under which peripheral adaptation occurs in the CNS during odorant stimulation. Here, we used two-photon laser-scanning microscopy and targeted extracellular recording in freely breathing anesthetized rats to investigate the correlate of peripheral adaptation at the first synapse of the olfactory pathway in olfactory bulb glomeruli. We find that during sustained stimulation at high concentration, odorants can evoke local field potential (LFP) postsynaptic responses that rapidly adapt with time, some within two inhalations. Simultaneous measurements of LFP and calcium influx at olfactory receptor neuron terminals reveal that postsynaptic adaptation is associated with a decrease in odorant-evoked calcium response, suggesting that it results from a decrease in glutamate release. This glomerular adaptation was concentration-dependent and did not change the glomerular input-output curve. In addition, in situ application of antagonists of either ionotropic glutamate receptors or metabotropic GABA(B) receptors did not affect this adaptation, thus discarding the involvement of local presynaptic inhibition. Glomerular adaptation, therefore, reflects the response decline of olfactory receptor neurons to sustained odorant. We postulate that peripheral fast adaptation is a means by which glomerular output codes for high concentration of odor.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据