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Juvenile social isolation reduces sociability in adulthood, but the underlying neural circuit mechanisms are poorly understood. We found that, in male mice, 2 weeks of social isolation immediately following weaning leads to a failure to activate medial prefrontal cortex neurons projecting to the posterior paraventricular thalamus (mPFC→pPVT) during social exposure in adulthood. Chemogenetic or optogenetic suppression of mPFC→pPVT activity in adulthood was sufficient to induce sociability deficits without affecting anxiety-related behaviors or preference toward rewarding food. Juvenile isolation led to both reduced excitability of mPFC→pPVT neurons and increased inhibitory input drive from low-threshold-spiking somatostatin interneurons in adulthood, suggesting a circuit mechanism underlying sociability deficits. Chemogenetic or optogenetic stimulation of mPFC→pPVT neurons in adulthood could rescue the sociability deficits caused by juvenile isolation. Our study identifies a pair of specific medial prefrontal cortex excitatory and inhibitory neuron populations required for sociability that are profoundly affected by juvenile social experience.Yamamuro et al. show that juvenile social isolation disrupts prefrontal neurons projecting to the paraventricular thalamus and associated prefrontal somatostatin interneurons, and thereby impairs sociability in adulthood.

Frontal top-down cortical neurons projecting to sensory cortical regions are well-positioned to integrate long-range inputs with local circuitry in frontal cortex to implement top-down attentional control of sensory regions. How adolescence contributes to the maturation of top-down neurons and associated local/long-range input balance, and the establishment of attentional control is poorly understood. Here we combine projection-specific electrophysiological and rabies-mediated input mapping in mice to uncover adolescence as a developmental stage when frontal top-down neurons projecting from the anterior cingulate to visual cortex are highly functionally integrated into local excitatory circuitry and have heightened activity compared to adulthood. Chemogenetic suppression of top-down neuron activity selectively during adolescence, but not later periods, produces long-lasting visual attentional behavior deficits, and results in excessive loss of local excitatory inputs in adulthood. Our study reveals an adolescent sensitive period when top-down neurons integrate local circuits with long-range connectivity to produce attentional behavior. Frontal top-down cortical neurons implement top-down attentional control of sensory regions. The authors reveal adolescence as a developmental stage when frontal top-down neurons projecting from the anterior cingulate to visual cortex are functionally integrated into local excitatory circuitry.

This cross-sectional study explored the moderating effect of religious service attendance on the relationship between discrimination and suicidal behaviors in a community sample of immigrants. A convenience sample of 348 individuals with immigrant experience to the U.S. completed a survey in either English, Portuguese or Spanish. The relationship between discrimination and suicidal behaviors was moderated by religious service attendance, equipping help from religious communities (RCs) and not having experienced discrimination in RCs. Other protections included being born outside the U.S. First-generation immigrants also reported less discrimination, which was a risk factor for suicidal behaviors. Other risk factors were refugee status, higher acculturation, discrimination in RCs, and certain types of help from RCs. Help that equipped them to navigate the U.S. system was associated with lower suicide risk. Community partners and RCs can help immigrants by collaborating to promote immigrant mental health because of the high religious affiliation of immigrants.

Aim Attention is a goal‐directed cognitive process that facilitates the detection of task‐relevant sensory stimuli from dynamic environments. Anterior cingulate cortical area (ACA) is known to play a key role in attentional behavior, but the specific circuits mediating attention remain largely unknown. As ACA modulates sensory processing in the visual cortex (VIS), we aim to test a hypothesis that frontal top‐down neurons projecting from ACA to VIS (ACAVIS) contributes to visual attention behavior through chemogenetic approach. Methods Adult, male mice were trained to perform the 5‐choice serial reaction time task (5CSRTT) using a touchscreen system. An intersectional viral approach was used to selectively express inhibitory designer receptors exclusively activated by designer drugs (iDREADD) or a static fluorophore (mCherry) in ACAVIS neurons. Mice received counterbalanced injections (i.p.) of the iDREADD ligand (clozapine‐N‐oxide; CNO) or vehicle (saline) prior to 5CSRTT testing. Finally, mice underwent progressive ratio testing and open field testing following CNO or saline administration. Results Chemogenetic suppression of ACAVIS neuron activity decreased correct task performance during the 5CSRTT mainly driven by an increase in omission and a trending decrease in accuracy with no change in behavioral outcomes associated with motivation, impulsivity, or compulsivity. Breakpoint during the progressive ratio task and distance moved in the open field test were unaffected by ACAVIS neuron suppression. CNO administration itself had no effect on task performance in mCherry‐expressing mice. Conclusion These results identify long‐range frontal‐sensory ACAVIS projection neurons as a key enactor of top‐down attentional behavior and may serve as a beneficial therapeutic target. Circuit‐specific chemogenetic silencing demonstrated that frontal neurons projecting from anterior cingulate cortex to visual are essential for top‐down control of attention behavior in mice. This study suggests that long‐range frontal‐sensory projection neurons as a key enactor of top‐down attentional behavior and may serve as a beneficial therapeutic target.

Frontal top-down cortical neurons projecting to sensory cortical regions are well-positioned to integrate long-range inputs with local circuitry in frontal cortex to implement top-down attentional control of sensory regions. How adolescence contributes to the maturation of top-down neurons and associated local/long-range input balance, and the establishment of attentional control is poorly understood. Here we combine projection-specific electrophysiological and rabies-mediated input mapping in mice to uncover adolescence as a developmental stage when frontal top-down neurons projecting from the anterior cingulate to visual cortex are highly functionally integrated into local excitatory circuitry and have heightened activity compared to adulthood. Chemogenetic suppression of top-down neuron activity selectively during adolescence, but not later periods, produces long-lasting visual attentional behavior deficits, and results in excessive loss of local excitatory inputs in adulthood. Our study reveals an adolescent sensitive period when top-down neurons integrate local circuits with long-range connectivity to produce attentional behavior.

Neuromodulation is known to play differing roles in circuit dynamics during early fetal development and adulthood. While neuromodulatory tone is present in between these time periods, the role of neuromodulation during adolescence and specifically its contribution to circuit formation is not well understood. In this study, we hypothesized that neuromodulation contributes to adolescent circuit development and the establishment of top-down attentional behavior. We previously identified cholinergic input as a major neuromodulatory source for top-down projection neurons from the anterior cingulate area (ACA) to the primary visual cortex (VIS) through rabies-mediated input mapping. In this study, we tested the developmental role of Lynx1, an endogenous suppressor of cholinergic signaling, on adolescent circuit formation and attentional behavior. In situ hybridization results showed that Lynx1 expression levels increase across development in top-down projection neurons. Through viral transduction, introducing Lynx1 into top-down cells of Lynx1KO mice rescued their attention deficit only when intervention occurred during adolescence. On the other hand, knocking-down Lynx1 in these top-down cells of wild-type mice during adolescence produced an attention deficit in adulthood. c-Fos analysis revealed that Lynx1 expression in top-down cells during adolescence was critical for establishing long-range functional connectivity between ACA and VIS in adulthood. In summary, our study revealed that Lynx1-mediated neuromodulation during adolescence is essential for establishing top-down neuronal circuitry that would later support adult attentional behavior.

Frontal top-down cortical neurons projecting to sensory cortical regions are well-positioned to integrate long-range inputs with local circuitry in frontal cortex to implement top-down attentional control of sensory regions. How adolescent period contributes to the maturation of top-down neurons and associated local/long-range input balance, and the establishment of attentional control is poorly understood. Here we combine projection-specific electrophysiological and rabies-mediated input mapping in mice to uncover adolescence as a developmental stage when frontal top-down neurons projecting from the anterior cingulate to visual cortex are highly functionally integrated into local excitatory circuitry and have heightened activity compared to adulthood. Chemogenetic suppression of top-down neuron activity selectively during adolescence, but not later periods, produces long-lasting visual attentional behavior deficits, and results in excessive loss of local excitatory inputs in adulthood. Our study reveals an adolescent sensitive period when top-down neurons integrate local circuits with long-range connectivity to produce attentional behavior. Competing Interest Statement The authors have declared no competing interest.

Background Effective communication is integral to the delivery of goal-concordant care for older adults and their family caregivers, and yet, it is uncommon in people with serious illness. This study explores the challenges of integrating end-of-life communication into heart failure management from the perspectives of older adults and family caregivers. Methods In a qualitative study of older adults with heart failure and their family caregivers, fourteen semi-structured interviews were conducted with 19 participants in Ontario, Canada. The interviews were transcribed verbatim and thematic analysis was applied to analyze the data. Results Four themes were identified in the context of participants’ understanding of illness: 1) trivializing illness-related challenges, 2) positivity in late life, 3) discomfort in having end-of-life conversations, and 4) reluctant to engage despite need. These challenges often intertwine with one another. Most participants had not engaged in end-of-life discussions with their clinicians or family members. Conclusion The findings provide insights that can inform approaches to integrate end-of-life communication for older adults with serious illness and caregivers. The identified challenges highlight a need for end-of-life communication to occur earlier in illness to be able to support individuals throughout the period of decline. In addition, end-of-life communication should be introduced iteratively for those who may not be ready to engage. Alternative approaches to communication are needed to elicit the challenges that patients and caregivers experience throughout the progression of illness to improve care for people nearing the end of life.

Scrub typhus is a vector-borne febrile illness caused by Orientia tsutsugamushi transmitted by the bite of Trombiculid mites. O. tsutsugamushi has a high genetic diversity and is increasingly recognized to have a wider global distribution than previously assumed. We evaluated the clinical outcomes and host immune responses of the two most relevant human pathogenic strains of O. tsutsugamushi; Karp (n = 4) and Gilliam (n = 4) in a time-course study over 80 days post infection (dpi) in a standardized scrub typhus non-human primate rhesus macaque model. We observed distinct features in clinical progression and immune response between the two strains; Gilliam-infected macaques developed more pronounced systemic infection characterized by an earlier onset of bacteremia, lymph node enlargement, eschar lesions and higher inflammatory markers during the acute phase of infection, when compared to the Karp strain. C-reactive protein (CRP) plasma levels, interferon gamma (IFN-γ, interleukin-1 receptor antagonist (IL-1ra), IL-15 serum concentrations, CRP/IL10- and IFN-γ/IL-10 ratios correlated positively with bacterial load in blood, implying activation of the innate immune response and preferential development of a T helper-type 1 immune response. The O. tsutsugamushi-specific immune memory responses in cells isolated from skin and lymph nodes at 80 dpi were more markedly elevated in the Gilliam-infected macaques than in the Karp-infected group. The comparative cytokine response dynamics of both strains revealed significant up-regulation of IFN-γ, tumor necrosis factor (TNF), IL-15, IL-6, IL-18, regulatory IL-1ra, IL-10, IL-8 and granulocyte-colony-stimulating factor (G-CSF). These data suggest that the clinical outcomes and host immune responses to scrub typhus could be associated with counter balancing effects of pro- and anti-inflammatory cytokine-mediated responses. Currently, no data on characterized time-course comparisons of O. tsutsugamushi strains regarding measures of disease severity and immune response is available. Our study provides evidence for the strain-specificity of host responses in scrub typhus, which supports our understanding of processes at the initial inoculation site (eschar), systemic disease progression, protective and/or pathogenic host immune mechanisms and cellular immune memory function. This study characterised an improved intradermal rhesus macaque challenge model for scrub typhus, whereby the Gilliam strain infection associated with higher disease severity in the rhesus macaque model than the previous Karp strain infection. Difficulties associated with inoculum quantitation for obligate-intracellular bacteria were overcome by using functional inoculum titrations in outbred mice. The Gilliam-based rhesus macaque model provides improved endpoint measurements and contributes towards the identification of correlates of protection for future vaccine development.

Background Earlier end‐of‐life communication is critical for people with heart failure given the uncertainty and high‐risk of mortality in illness. Despite this, end‐of‐life communication is uncommon in heart failure. Left unaddressed, lack of end‐of‐life discussions can lead to discordant care at the end of life. Objective This study explores patients' and caregivers’ understanding of illness, experiences of uncertainty, and perceptions of end‐of‐life discussions in advanced illness. Design Interpretive descriptive qualitative study of older adults with heart failure and family caregivers. Fourteen semi‐structured interviews were conducted with 19 participants in Ontario, Canada. Interviews were transcribed verbatim and content analysis was used to analyse the data. Main results Understanding of illness was shaped by participants’ illness‐related experiences (e.g. symptoms, hospitalizations and self‐care routines) and the ability to adapt to challenges of illness. Participants were knowledgeable of heart failure management, and yet, were limited in their understanding of the consequences of illness. Participants adapted to the challenges of illness which appeared to influence their perception of overall health. Uncertainty reflected participants’ inability to connect manifestations of heart failure as part of the progression of illness towards the end of life. Most participants had not engaged in prior end‐of‐life discussions. Conclusion Detailed knowledge of heart failure management does not necessarily translate to an understanding of the consequences of illness. The ability to adapt to illness‐related challenges may delay older adults and family caregivers from engaging in end‐of‐life discussions. Future research is needed to examine the impact of addressing the consequences of illness in facilitating earlier end‐of‐life communication.