Biology subjects

Hidema, S.

Publications and source records attributed to Hidema, S..

3 recordsLinked to original sources

bioRxiv2020

Oxytocin signals via Gi and Gq to drive persistent CA2 pyramidal cell firing and strengthen CA3-CA1 neurotransmission

The oxytocin receptor (OXTR) is concentrated in specific brain regions, exemplified by hippocampal subregion CA2, that support social information processing. Oxytocinergic modulation of CA2 directly affects social behavior, yet how oxytocin regulates activity in CA2 remains incompletely understood. We found that OXTR stimulation acts via closure of M-current potassium channels in all OXT-sensitive CA2 neurons. M-current inhibition was persistent in CA2 pyramidal cells, whose prolonged burst firing required functional coupling of the OXTR to both Gq and Gi proteins. Other neuromodulators acted via distinct patterns of G-protein signaling to induce CA2 pyramidal neuron burst firing, underscoring its likely importance. CA2 burst firing impacted hippocampal subregion CA1 where stratum oriens-resident CA1 interneurons were targeted more strongly than CA1 pyramidal cells. Oxytocinergic modulation of interneurons, via CA2 pyramidal cell input and directly, triggered a long-lasting enhancement of CA3-CA1 transmission. Thus, transient activation of oxytocinergic inputs may initiate long-lasting recording of social information.

cell biology↗

bioRxiv2019

Oxytocin Neurons Enable Social Transmission of Maternal Behavior

Maternal care is profoundly important for mammalian survival, and non-biological parents can express it after experience with infants. One critical molecular signal for maternal behavior is oxytocin, a hormone centrally released by hypothalamic paraventricular nucleus (PVN). Oxytocin enables plasticity within the auditory cortex, a necessary step for responding to infant vocalizations. To determine how this change occurs during natural experience, we continuously monitored homecage behavior of female virgin mice co-housed for days with an experienced mother and litter, synchronized with recordings from virgin PVN cells, including from oxytocin neurons. Mothers engaged virgins in maternal care by ensuring their nest presence, and demonstrated maternal behavior in self-generated pup retrieval episodes. These social interactions activated virgin PVN and gated behaviorally-relevant cortical plasticity for pup vocalizations. Thus rodents can acquire maternal behavior by social transmission, and our results describe a mechanism for adapting brains of adult caregivers to infant needs via endogenous oxytocin. One Sentence SummaryMother mice help co-housed virgins become maternal by enacting specific behaviors that activate virgin oxytocin neurons.

neuroscience↗

bioRxiv2019

Quantitative Cellular-Resolution Map of the Oxytocin Receptor in Postnatally Developing Mouse Brains

Oxytocin receptor (OTR) plays critical roles in social behavior development. Despite its significance, brain-wide quantitative understanding of OTR expression remains limited in postnatally developing brains. Here, we validated and utilized fluorescent reporter mice (OTRvenus/+) to examine OTR cells across postnatal periods. We developed postnatal 3D template brains to register whole brain images with cellular resolution to systematically quantify OTR cell densities. We found that cortical regions showed temporally and spatially heterogeneous patterns with transient postnatal OTR expression without cell death. Cortical OTR cells were largely not GABAergic neurons with the exception of cells in layer 6b. Subcortical regions showed similar temporal regulation except the hypothalamus. Moreover, our unbiased approach identified two hypothalamic nuclei with sexually dimorphic OTR expression. Lastly, we created a website to easily share our imaging data. In summary, we provide comprehensive quantitative data to understand postnatal OTR expression in the mouse brain.

neuroscience↗