PT  - JOURNAL ARTICLE
AU  - Kate A. White
AU  - Yun-Feng Zhang
AU  - Zhijian Zhang
AU  - Janardhan P. Bhattarai
AU  - Andrew H. Moberly
AU  - Estelle E. in 't Zandt
AU  - José I. Pena-Bravo
AU  - Huijie Mi
AU  - Xianglian Jia
AU  - Marc V. Fuccillo
AU  - Fuqiang Xu
AU  - Minghong Ma
AU  - Daniel W. Wesson
TI  - Glutamatergic Neurons in the Piriform Cortex Influence the Activity of D1- and D2-Type Receptor-Expressing Olfactory Tubercle Neurons
AID  - 10.1523/JNEUROSCI.1444-19.2019
DP  - 2019 Nov 27
TA  - The Journal of Neuroscience
PG  - 9546--9559
VI  - 39
IP  - 48
4099  - http://www.jneurosci.org/content/39/48/9546.short
4100  - http://www.jneurosci.org/content/39/48/9546.full
SO  - J. Neurosci.2019 Nov 27; 39
AB  - Sensory cortices process stimuli in manners essential for perception. Very little is known regarding interactions between olfactory cortices. The piriform “primary” olfactory cortex, especially its anterior division (aPCX), extends dense association fibers into the ventral striatum's olfactory tubercle (OT), yet whether this corticostriatal pathway is capable of shaping OT activity, including odor-evoked activity, is unknown. Further unresolved is the synaptic circuitry and the spatial localization of OT-innervating PCX neurons. Here we build upon standing literature to provide some answers to these questions through studies in mice of both sexes. First, we recorded the activity of OT neurons in awake mice while optically stimulating principal neurons in the aPCX and/or their association fibers in the OT while the mice were delivered odors. This uncovered evidence that PCX input indeed influences OT unit activity. We then used patch-clamp recordings and viral tracing to determine the connectivity of aPCX neurons upon OT neurons expressing dopamine receptor types D1 or D2, two prominent cell populations in the OT. These investigations uncovered that both populations of neurons receive monosynaptic inputs from aPCX glutamatergic neurons. Interestingly, this input originates largely from the ventrocaudal aPCX. These results shed light on some of the basic physiological properties of this pathway and the cell-types involved and provide a foundation for future studies to identify, among other things, whether this pathway has implications for perception.SIGNIFICANCE STATEMENT Sensory cortices interact to process stimuli in manners considered essential for perception. Very little is known regarding interactions between olfactory cortices. The present study sheds light on some of the basic physiological properties of a particular intercortical pathway in the olfactory system and provides a foundation for future studies to identify, among other things, whether this pathway has implications for perception.