JN Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
 QUICK SEARCH:   [advanced]


     


J Neurophysiol (October 31, 2007). doi:10.1152/jn.00902.2007
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
99/1/77    most recent
00902.2007v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Bian, X.
Right arrow Articles by Luo, M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Bian, X.
Right arrow Articles by Luo, M.
Submitted on August 13, 2007
Accepted on October 25, 2007

Cortical-like Functional Organization of the Pheromone-processing Circuits in the Medial Amygdala

Xiling Bian1, Yuchio Yanagawa2, Wei R Chen3, and Minmin Luo4*

1 Institute of Biophysics, Chinese Academy of Sciences, Beijing , Beijing, China; NIBS, Beijing , Beijing, China
2 Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine and SORST, Maebashi , Japan
3 Department of Neurobiology, Yale University, New Haven, Connecticut, United States
4 NIBS, Beijing , Beijing, China

* To whom correspondence should be addressed. E-mail: luominmin{at}nibs.ac.cn.

The medial amygdala (MeA) is a critical center for processing pheromonal signals that regulate social and reproductive behaviors, but the fundamental cellular mechanisms underlying signal processing in the MeA have remained largely unknown. Some studies suggest that the MeA belongs to the striatum and provides inhibitory output to hypothalamic areas including the ventromedial hypothalamus (VMH). By combining tract tracing, genetic labeling of GABAergic neurons, and immunostaining against markers for glutamatergic synapses, we found that a majority of MeA neurons projecting to the VMH are glutamatergic. Whole-cell patch clamp recordings revealed that VMH-projecting neurons form a homogeneous population in terms of morphological and intrinsic properties. Nearly all cells possess Ih and IT and in some cases they can give rise to post-inhibitory rebound spikes. Morphological analysis of neurobiotin filled cells revealed neurons with long dendritic arbors that extend to the MeA external layer and within the amygdala. Thus, the VMH-projecting neurons in the MeA differ from the medium spiny neurons, the principal neurons of striatum, in terms of intrinsic physiological properties and morphology. In contrast, they resemble a subset of pyramidal cells in deep piriform cortex. Similar to pyramidal cells in piriform cortex, the VMH-projecting neurons in the MeA received direct excitatory input from their upstream sensory areas and inhibitory input from local GABAergic neurons. We conclude that pheromonal signals relayed to the VMH are processed by unique cortical, but not striatal, circuitry in the MeA.







HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 2007 by the The American Physiological Society.