Sex differences and effects of the estrous stage on hippocampal-prefrontal theta communications.
Sex differences and effects of the estrous stage on hippocampal-prefrontal theta communications.
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DOI：
10.14814/phy2.14646
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发表时间：
2020-11
影响因子：
2.5
通讯作者：
Kabbaj M
中科院分区：
文献类型：
--
作者：
Schoepfer KJ;Xu Y;Wilber AA;Wu W;Kabbaj M
Effective communication between the mammalian hippocampus and neocortex is essential to certain cognitive‐behavioral tasks critical to survival in a changing environment. Notably, functional synchrony between local field potentials (LFPs) of the ventral hippocampus (vHPC) and the medial prefrontal cortex (mPFC) within the theta band (4–12 Hz) underlies innate avoidance behavior during approach‐avoidance conflict tasks in male rodents. However, the physiology of vHPC‐mPFC communications in females remains unestablished. Furthermore, little is known about how mPFC subdivisions functionally interact in the theta band with hippocampal subdivisions in both sexes in the absence of task demand. Given the established roles of biological sex and gonadal hormone status on innate avoidance behaviors and neuronal excitability, here, we characterize the effects of biological sex and female estrous stage on hippocampal‐prefrontal (HPC‐mPFC) theta signaling in freely moving female and male rats. LFPs from vHPC, dorsal hippocampus (dHPC), mPFC‐prelimbic (PrL), and mPFC‐infralimbic (IL) were simultaneously recorded during spontaneous exploration of a familiar arena. Data suggest that theta phase and power in vHPC preferentially synchronize with PrL; conversely, dHPC and IL preferentially synchronize. Males displayed greater vHPC‐PrL theta synchrony than females, despite similar regional frequency band power and inter‐regional coherence. Additionally, several significant estrous‐linked changes in HPC‐mPFC theta dynamics were observed. These findings support the hypothesis that HPC‐mPFC theta signaling is sensitive to both biological sex and female estrous stage. These findings establish novel research avenues concerning sex as a biological variable and effects of gonadal hormone status on HPC‐mPFC network activity as it pertains to threat evaluation biomarkers. Effective signaling between subregions of the hippocampus and the prefrontal cortex underlies several cognitive‐behavioral processes necessary for survival. Theta‐frequency synchrony between the local fields of the ventral hippocampus and the prefrontal cortex regulates innate avoidance behavior in male rodents. However, this circuit remains understudied in females, despite its potential utility in research modeling the neurobiology of anxiety disorders (and sex differences therein). Here, we demonstrate that both biological sex and female hormone status have multifaceted effects on hippocampal‐prefrontal theta‐frequency signaling in freely‐moving rats during the exploration of a familiar arena. These findings provide insight into how biological sex and the female estrous stage shape the way in which these circuits may represent the potential for threat.
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影响因子：
4.8
作者：
McLean CP;Asnaani A;Litz BT;Hofmann SG
通讯作者：
Hofmann SG
影响因子：
16.2
作者：
Fanselow, Michael S.;Dong, Hong-Wei
通讯作者：
Dong, Hong-Wei
影响因子：
5.3
作者：
Blume, Shannon R.;Freedberg, Mari;Rosenkranz, J. Amiel
通讯作者：
Rosenkranz, J. Amiel
影响因子：
2.9
作者：
JOHNSTON, AL;FILE, SE
通讯作者：
FILE, SE
影响因子：
3.8
作者：
Guerra-Araiza, C;Coyoy-Salgado, A;Camacho-Arroyo, I
通讯作者：
Camacho-Arroyo, I