Nursing interventions to empower the family caregiver of person with lower limb amputation: scoping review.

OBJECTIVES: to map nursing interventions that empower the Family caregiver of the person with lower limb amputation for is role. METHODS: scoping review guided by Joanna Briggs Institute methodology conducted in different databases (including gray literature). RESULTS: six studies published between 2009 and 2021 were included. Interventions of counselling and support for patients and family; peer support interventions performed by a certified pair; involvement of caregivers or family members in support groups; and key interventions for patient and family caregiver psychological balance. Two studies discussed the importance of caregiver and amputee training and development of coping skills. Another study recommended Interventions of informative support for caregivers regarding care for the amputee and adaptation to home. CONCLUSIONS: results of this review allow the identification of recommendations (guidelines) for practice and recommendations/suggestions for interventions according with identified needs of family caregivers of patients with lower limb amputation.

Copaiba oil minimizes inflammation and promotes parenchyma re-epithelization in acute allergic asthma model induced by ovalbumin in BALB/c mice.

Introduction: Asthma is a condition of airflow limitation, common throughout the world, with high mortality rates, especially as it still faces some obstacles in its management. As it constitutes a public health challenge, this study aimed to investigate the effect of copaiba oil (e.g., Copaifera langsdorffii), as a treatment resource, at doses of 50 and 100 mg/kg on certain mediators of acute lung inflammation (IL-33, GATA3, FOXP3, STAT3, and TBET) and early mechanisms of lung remodeling (degradation of elastic fiber tissues, collagen deposition, and goblet cell hyperplasia). Methods: Using an ovalbumin-induced acute allergic asthma model in BALB/c mice, we analyzed the inflammatory mediators through immunohistochemistry and the mechanisms of lung remodeling through histopathology, employing orcein, Masson's trichrome, and periodic acid-Schiff staining. Results: Copaiba oil treatment (CO) reduced IL-33 and increased FOXP3 by stimulating the FOXP3/GATA3 and FOXP3/STAT3 pathways. Additionally, it upregulated TBET, suggesting an additional role in controlling GATA3 activity. In the respiratory epithelium, CO decreased the fragmentation of elastic fibers while increasing the deposition of collagen fibers, favoring epithelial restructuring. Simultaneously, CO reduced goblet cell hyperplasia. Discussion: Although additional research is warranted, the demonstrated anti-inflammatory and re-epithelializing action makes CO a viable option in exploring new treatments for acute allergic asthma.

Needs of Family Caregivers of People with Lower Limb Amputations: A Scoping Review.

Lower limb amputation affects several parameters of a patient's life. Family caregivers providing care for these patients experience multiple feelings and needs; knowing caregivers' needs is essential to prepare them for this new role, as well as the health planning of this type of care. This scoping review aimed to identify and map the needs of family caregivers of people with lower limb amputations. This scoping review was conducted in accordance with the JBI methodological framework and the PRISMA-ScR reporting guidelines. A bibliographical search was carried out on the needs of family caregivers of lower limb amputees in 15 databases. Two independent reviewers extracted data using a data extraction tool developed for this scoping review. Eight studies were included in the present review (n = 6 quantitative studies; n = 2 reviews). Results indicate that family caregivers of people with lower limb amputations may experience an extensive range of needs, as follows: (i) mental health and psychological support, (ii) physical health, (iii) health and well-being, (iv) supportive care, (v) social support, and (vi) educational/informational support. The needs identified in this review can help to develop interventions and programs that provide better support during the situational transition process.

Social representations of tuberculosis by people with the disease.

OBJECTIVE: To understand the social representations of people with tuberculosis about the disease and its implications for following treatment. METHOD: A descriptive, qualitative study based on the Theory of Social Representations. It was conducted in a municipal health unit in the city of Belém. The participants were people diagnosed with tuberculosis and undergoing directly observed treatment, with the sample size defined by the data saturation technique. Data collection was done through semi-structured interviews. For data analysis it was used thematic content analysis. RESULTS: The records converged into three categories: Representations of tuberculosis and its impacts on the diagnosis; The faces of treatment: challenges facing follow-up and hope; and Constructions of living with the disease in family and society. FINAL CONSIDERATIONS: Living with the disease transforms everyday life and relationships. Discrimination and prejudice denote the need to reconfigure such representations for patients to be embraced.

Anaesthetic peripheral nerve blocks for a total knee replacement revision due to infection in a patient with symptomatic chronic coronary syndrome: A case report.

This report aims to describe the perioperative management of a high-risk cardiovascular patient proposed for urgent total knee replacement revision. We discuss the use of peripheral nerve blocks and its impact on haemodynamic stability and clinical outcomes, including major cardiovascular adverse events and myocardial injury after non-cardiac surgery.

Social representations of tuberculosis by people with the disease / Representaciones sociales de tuberculosis por personas con la enfermedad / Representações sociais da tuberculose por pessoas com a doença

ABSTRACT Objective: To understand the social representations of people with tuberculosis about the disease and its implications for following treatment. Method: A descriptive, qualitative study based on the Theory of Social Representations. It was conducted in a municipal health unit in the city of Belém. The participants were people diagnosed with tuberculosis and undergoing directly observed treatment, with the sample size defined by the data saturation technique. Data collection was done through semi-structured interviews. For data analysis it was used thematic content analysis. Results: The records converged into three categories: Representations of tuberculosis and its impacts on the diagnosis; The faces of treatment: challenges facing follow-up and hope; and Constructions of living with the disease in family and society. Final considerations: Living with the disease transforms everyday life and relationships. Discrimination and prejudice denote the need to reconfigure such representations for patients to be embraced.

RESUMEN Objetivo: Comprender las representaciones sociales de personas con tuberculosis sobre la enfermedad y sus implicaciones para el seguimiento del tratamiento. Método: Estudio descriptivo, con abordaje cualitativo, basado en la Teoría de las Representaciones Sociales. Se llevó a cabo en una unidad de salud municipal de la ciudad de Belém. Los participantes fueron personas con diagnóstico de tuberculosis y en tratamiento bajo observación directa, cuyo cuantitativo fue definido por la técnica de saturación de datos. La recolección de datos se realizó a través de una entrevista semiestructurada. Para analizar dos datos, utilice un análisis de contenido temático. Resultados: Los registros convergieron en tres categorías: Representaciones de la tuberculosis y sus impactos en el diagnóstico; Como enfrenta el tratamiento: desafíos que enfrenta el seguimiento y la esperanza; y Construcciones de convivencia con la enfermedad en familia y sociedad. Consideraciones finales: O vivir con una enfermedad transforma la vida cotidiana y las relaciones. La discriminación y el prejuicio denotan la necesidad de reconfigurar estas representaciones, para que el docente sea aceptado.

RESUMO Objetivo: Compreender as representações sociais de pessoas com tuberculose sobre a doença e implicações no tratamento. Método: Estudo descritivo, de abordagem qualitativa, com base na Teoria das Representações Sociais. Realizado em uma unidade municipal de saúde no município de Belém. Os participantes foram pessoas com diagnóstico de tuberculose e em tratamento diretamente observado, cujo quantitativo foi definido pela técnica da saturação de dados. A coleta de dados foi realizada por meio de entrevista semiestruturada. Para análise dos dados utilizou-se a análise temática de conteúdo. Resultados: Os registros convergiram em três categorias: Representações da tuberculose e seus impactos frente ao diagnóstico; as faces do tratamento: desafios frente ao seguimento e esperança; e Construções do conviver com a doença em família e sociedade. Considerações finais: O conviver com a doença transforma o cotidiano e as relações. A discriminação e preconceito denotam a necessidade de reconfigurar tais representações, para o doente ser acolhido.

Representações sociais do cuidador familiar sobre cuidados paliativos em paciente terminal / Social representations of the family caregiver about palliative care in terminal patient / Representaciones sociales del cuidador familiar sobre cuidados paliativos en pacientes terminales

Objetivo: analisar as representações sociais dos cuidadores familiares sobre os cuidados paliativos em paciente terminal. Método: estudo descritivo com abordagem qualitativa. Para a interpretação dos resultados foi empregado como aporte teórico a Teoria das Representações Sociais. A pesquisa foi realizada com 30 cuidadores familiares de pacientes com câncer em estágio final. Resultado: observou-se a dimensão do cuidador familiar e o meio inserido das representações sociais. O cuidador não é um mero familiar, mas sim alguém que sofre junto com o doente, principalmente, os que estão com câncer em fase terminal, e por isso também precisa de orientações para seus cuidados físico e emocional. Discussão: A teoria das representações sociais, vinculada a área da saúde do cuidador familiar. Considerações finais: As representações sociais do cuidador familiar possibilitaram identificar a verdadeira extensão das questões diárias no cotidiano profissional

Objective: to analyze the social representations of family caregivers about palliative care in terminally ill patients. Method: descriptive study with a qualitative approach. For the interpretation of the results, the Theory of Social Representations was used as a theoretical contribution. The research was conducted with 30 family caregivers of end-stage cancer patients. Result: the dimension of the family caregiver and the inserted environment of the social representations were observed. The caregiver is not a mere family member, but someone who suffers together with the patient, especially those with terminal cancer, and therefore also needs guidance for their physical and emotional care. Discussion: the theory of social representations, linked to the area of family caregiver health. Final considerations:The social representations of the family caregiver made it possible to identify the true extent of daily issues in the professional routine

Objetivos: analizar las representaciones sociales de los cuidadores familiares sobre los cuidados paliativos en pacientes terminales. Método: estudio descriptivo con enfoque cualitativo. Para la interpretación de los resultados se utilizó como aporte teórico la Teoría de las Representaciones Sociales. La investigación se llevó a cabo con 30 cuidadores familiares de pacientes con cáncer en etapa terminal. Resultado: se observó la dimensión del cuidador familiar y el ambiente inserto de las representaciones sociales. El cuidador no es un simple miembro de la familia, sino alguien que sufre junto con el paciente, especialmente aquellos con cáncer terminal, y por lo tanto también necesita orientación para su cuidado físico y emocional. Discusión: La teoría de las representaciones sociales, vinculada al área de la salud del cuidador familiar. Consideraciones finales: las representaciones sociales del cuidador familiar permitieron identificar la verdadera extensión de las cuestiones cotidianas en el cotidiano profesional

Chronic treatment with D2-antagonist haloperidol leads to inhibitory/excitatory imbalance in striatal D1-neurons.

Striatal dysfunction has been implicated in the pathophysiology of schizophrenia, a disorder characterized by positive symptoms such as hallucinations and delusions. Haloperidol is a typical antipsychotic medication used in the treatment of schizophrenia that is known to antagonize dopamine D2 receptors, which are abundantly expressed in the striatum. However, haloperidol's delayed therapeutic effect also suggests a mechanism of action that may go beyond the acute blocking of D2 receptors. Here, we performed proteomic analysis of striatum brain tissue and found more than 400 proteins significantly altered after 30 days of chronic haloperidol treatment in mice, namely proteins involved in glutamatergic and GABAergic synaptic transmission. Cell-type specific electrophysiological recordings further revealed that haloperidol not only reduces the excitability of striatal medium spiny neurons expressing dopamine D2 receptors (D2-MSNs) but also affects D1-MSNs by increasing the ratio of inhibitory/excitatory synaptic transmission (I/E ratio) specifically onto D1-MSNs but not D2-MSNs. Therefore, we propose the slow remodeling of D1-MSNs as a mechanism mediating the delayed therapeutic effect of haloperidol over striatum circuits. Understanding how haloperidol exactly contributes to treating schizophrenia symptoms may help to improve therapeutic outcomes and elucidate the molecular underpinnings of this disorder.

Chronic stress promotes basal ganglia disinhibition by increasing the excitatory drive of direct-pathway neurons.

Chronic stress (CS) is a well-recognized triggering factor in obsessive-compulsive disorder (OCD) and Tourette's syndrome (TS), two neuropsychiatric disorders characterized by the presence of stereotypic motor symptoms. Planning and execution of motor actions are controlled by the dorsal striatum, a brain region that promotes or suppresses motor movement by activating striatal neurons from the direct- or indirect-pathway, respectively. Despite the dorsal striatum being affected in motor disorders and by CS exposure, how CS affects the two opposing pathways is not fully understood. Here, we report that CS in mice selectively potentiates the direct-pathway, while sparing the indirect-pathway. Specifically, we show that CS both increases excitation and reduces inhibition over direct-pathway neurons in the dorsomedial striatum (DMS). Furthermore, inhibitory interneurons located in the DMS also display reduced excitatory drive after chronic stress, thus amplifying striatal disinhibition. Altogether, we propose a model where both increased excitatory drive and decreased inhibitory drive in the striatum causes disinhibition of basal ganglia's motor direct pathway - a mechanism that might explain the emergence of motor stereotypies and tic disorders under stress.

Sucrose preference test: A systematic review of protocols for the assessment of anhedonia in rodents.

Anhedonia is described as a decreased ability to experience rewarding and enjoyable activities, a core symptom of major depressive disorder. The sucrose preference test (SPT) is a widely used and reliable behavioural test to assess anhedonia in rodents, based on a two-bottle choice paradigm. To date, different protocols are in use, inducing variability between researchers and hampering comparisons between studies. We performed a systematic review of the SPT protocols used in 2021 to identify the parameters in which they differ and their potential impact. We searched a total of four databases (PubMed, Scopus, Web of Science and Science Direct), from 1st January 2021 to 31st December 2021, and screened a total of 1066 articles. After screening by title and abstract, a total of 415 articles were included in this review. We extracted and analysed the different procedures used, the type of sweet solution and the habituation, deprivation, and testing protocols. The overall quality of the studies was considered very good, however, SPT protocols were extremely variable between studies with a total of 65 different habituation protocols and 104 combinations of food/water deprivation and preference testing duration. As the SPT is one of the most used tests to assess anhedonia in rodents, this work raises awareness of the great variability in SPT protocols being currently used. Furthermore, we call for standardization in the protocol used, and overall improvement of data reporting of methodologies and results, to increase the consistency between studies and allow a better comparison of results between different labs.

Comparative neurotoxicity of dietary methylmercury and waterborne inorganic mercury in fish: Evidence of optic tectum vulnerability through morphometric and histopathological assessments.

This work investigated the effects of inorganic mercury (iHg) and methylmercury (MeHg) on the fish optic tectum morphology, viz. in relation to: (i) vulnerability of specific optic tectum layers; (ii) preferential targeting of Hg forms to neurons or glial cells; (iii) comparative toxicity of iHg and MeHg in this brain area that is in the maintenance of several fish behaviors. Two experiments exposing juvenile white seabream (Diplodus sargus) to waterborne iHg [HgCl2 (2 µg L-1)] and dietary MeHg (8.7 µg g-1) were performed, comprising both exposure (7 and 14 days; E7 and E14, respectively) and post-exposure (28 days; PE28) periods. Morphometric assessments were performed using stereological methods where the layers of the optic tectum were outlined, while its area and the number of neurons and glial cells were estimated. A histopathological assessment was also performed per section and per layer of optic tectum. iHg exposure did not trigger the loss of neurons during the exposure periods, while a decrease of glial cells was detected in a single layer of the optic tectum at E14. Differently, upon MeHg exposure, a decrease on the number of neurons and glial cells was found in several layers of optic tectum. In the post-exposure, both Hg forms triggered the loss of neurons, while only MeHg exposure led to a decrease on the number of glia cells. The histopathological assessment pointed out a higher toxicity of MeHg in the optic tectum layers, particularly in the post-exposure period, while no significant alterations were found in fish exposed to iHg. Hg forms targeted preferentially neurons. iHg and MeHg are relevant neurotoxicants to fish, with MeHg exposure leading to a higher toxicity than iHg in the optic tectum. After 28 days of post-exposure, iHg and MeHg neurotoxicity remained prominent, suggesting long-term effects of these toxicants.

Injection of kaolin/carrageenan in the rat knee joint induces progressive experimental knee osteoarthritis.

ABSTRACT: Osteoarthritis (OA), the most common joint disorder worldwide, is characterized by progressive degeneration of articular and periarticular structures, leading to physical and emotional impairments that greatly affect the quality of life of patients. Unfortunately, no therapy has been able to halt the progression of the disease. Owing to the complexity of OA, most animal models are only able to mimic a specific stage or feature of the human disorder. In this work, we demonstrate the intraarticular injection of kaolin or carrageenan leads to the progressive degeneration of the rat's knee joint, accompanied by mechanical hyperalgesia and allodynia, gait impairments (reduced contact area of the affected limb), and radiological and histopathological findings concomitant with the development of human grade 4 OA. In addition, animals also display emotional impairments 4 weeks after induction, namely, anxious and depressive-like behaviour, important and common comorbidities of human OA patients. Overall, prolonging kaolin or carrageenan-induced monoarthritis mimics several important physical and psychological features of human OA in both male and female rodents and could be further applied in long-term studies of OA-associated chronic pain.

Retrospective Survey and Analysis of Anaesthesia and Outcomes in Paediatric Cleft Lip or Palate Surgery in a Tertiary Care Center, Portugal.

INTRODUCTION: Orofacial clefts are the most common craniofacial abnormalities, affecting approximately one in 700 newborns each year. The anaesthetic management of these patients is challenging, including difficulties in airway approach and respiratory complications that have direct implications in the final outcome. AIM: The present study aimed to characterize the anesthetic approach to paediatric patients undergoing cleft palate or lip surgical repair and review the perioperative anesthetic complications in a tertiary Portuguese hospital. METHODS: Data were collected from a retrospective review of the patient records which included anaesthesia perioperative notes of paediatric patients submitted to cleft surgery repair during a five-year period (2016 to 2021). Demographic, pre-anaesthetic characteristics, anaesthetic management and perioperative complications were recorded. RESULTS: A total of 102 patients were included, with a median age of 1.5 years. Congenital syndromes were present in 14 (13.7%) of the children included. Inhalational induction of anaesthesia with sevoflurane was the preferred approach in 86 cases (84.3%), with neuromuscular blockade being used in 59 cases (57.8%). Intubation was achieved at first attempt in 91 (89.2%) cases with four (3.9%) patients needing three or more attempts. Intraoperative respiratory-related complications were the most frequent, occurring in 22 (21.6%) cases. These include multiple attempts to intubation, desaturation due to bronchospasm or laryngospasm. The average length of stay was two days. Postoperative complications were recorded in 17 (16.7%) of patients. DISCUSSION: The predominance of airway and respiratory complications occurring in cleft is consistent with previous studies. Care must be taken in order to avoid such complications in the perioperative period by following protocols, having skilled personnel, appropriate monitoring equipment and airway devices available during cleft surgeries to minimise morbidity.

Debriefing or Feedback: Exploring the Impact of Two Post-Scenario Discussion Methods in the Acquisition and Retention of Non-Technical Skills.

INTRODUCTION: There is a paucity of quantitative studies objectively comparing debriefing and feedback as methods for post-scenario discussion and its impact on healthcare teams' acquisition and retention of non-technical skills. The main purpose of this study is to provide some insight on this research question, using a sample of medical students. A secondary objective explores students' opinion and preference on the post-scenario discussion. MATERIAL AND METHODS: Forty-five medical students were distributed among 15 teams, and randomly allocated to two groups. Each team participated in three different simulated scenarios, with similar levels of difficulty and opportunities to apply specific non-technical skills: leadership, communication, and task management. To assess the acquisition and retention of skills, scenarios occurred on days one (baseline), two (acquisition) and 20 (retention). Team performance was objectively evaluated by an observer, using scenario recordings. Students individually assessed different aspects of debriefing and feedback. RESULTS: Both debriefing and feedback groups showed similar overall increase in objective scores, with significant increase between days one and two (acquisition), and a smaller increase between days two and 20 (retention). Students indicated debriefing as the preferred discussion method. CONCLUSION: Debriefing and feedback are effective post-scenario discussion methods, promoting acquisition and retention of non-technical skills, by undergraduate students. Allying debriefing reflexive practice with feedback directive style, and shifting appropriately between facilitation and instruction, can be a good compromise to achieve a timely and educationally meaningful discussion.

Introdução: Há uma escassez de estudos quantitativos comparando objetivamente o debriefing e o feedback como métodos de discussão pós-cenário e o seu impacto na aquisição e retenção de competências não-técnicas pelas equipas de saúde. O objetivo principal deste estudo é explorar esta questão de investigação, usando uma amostra de estudantes de medicina. Adicionalmente, foi analisada a opinião e preferência dos estudantes sobre o método de discussão pós-cenário. Material e Métodos: Quarenta e cinco estudantes de medicina foram distribuídos em 15 equipas e alocados aleatoriamente a dois grupos. Cada equipa participou em três cenários de simulação diferentes, com níveis de dificuldade semelhantes e as mesmas oportunidades para aplicar as seguintes competências não-técnicas específicas: liderança, comunicação e gestão de tarefas. Para avaliar a aquisição e retenção de competências, os cenários decorreram nos dias um (linha de base), dois (aquisição) e 20 (retenção). O desempenho de cada equipa foi avaliado objetivamente por um observador, através da análise das gravações dos cenários e de uma checklist. Os estudantes foram ainda convidados a avaliar individualmente a condução do debriefing e do feedback. Resultados: Ambos os grupos (debriefing e feedback) demonstraram um incremento semelhante nas pontuações objetivas, com um aumento acentuado entre os dias um e dois (aquisição) e um aumento ligeiro entre os dias dois e 20 (retenção). Os estudantes indicaram o debriefing como método de discussão preferencial. Conclusão: O debriefing e o feedback são métodos eficazes de discussão pós-cenário, promovendo a aquisição e retenção de competências não-técnicas por estudantes pré-graduados. A aliança da prática reflexiva do debriefing com o estilo diretivo de feedback, alternando apropriadamente entre facilitação e instrução, é um compromisso aceitável para alcançar uma discussão educacionalmente significativa num tempo limitado.

Representações sociais sobre o processo de saúde e doença na crença católica / Social representations about the health and disease process in catholic belief / Representaciones sociales sobre el proceso de salud y enfermedad en la creencia católica

Objetivo: estudo objetivou descrever as representações sociais de pacientes católicos e analisar as implicações do seu imaginário para o processo saúde-doença. Método: estudo descritivo, com abordagem qualitativa. Realizado em um hospital oncológico, tendo como participantes pessoas autodeclaradas católicas. Utilizou-se entrevista semiestruturada e técnica de livre associação de palavras para coleta de dados. Resultados: emergiram três unidades temáticas: A representação da doença para cristãos católicos; A religião católica como alicerce no processo de adoecimento; Representação da doença para católicos: enfermidades adquiridas por infringirmos as leis de Deus. Considerações finais: a religiosidade é parte significativa no cotidiano das pessoas e deve ser respeitada independente da crença do profissional.

Objective: the study aimed to describe the social representations of Catholic patients and analyze the implications of their imaginary for the health-disease process. Method: descriptive study, with qualitative approach. Carried out in an oncology hospital, having as participants self-declared Catholic people. Semi-structured interviews and a technique of free word association were used for data collection. Results: three thematic units emerged: The representation of the disease for Catholic christians; The Catholic religion as a foundation in the process of illness; Representation of the disease for Catholics: diseases acquired by breaking the laws of God. Final considerations: religiosity is a significant part of people's daily lives and should be respected regardless of the professional's belief.

Objetivo: el estudio tuvo como objetivo describir las representaciones sociales de los pacientes católicos y analizar las implicaciones de su imaginario para el proceso salud-enfermedad. Método: estudio descriptivo, con enfoque cualitativo. Realizado en un hospital oncológico, teniendo como participantes personas autodeclaradas católicas. Para la recolección de datos se utilizaron entrevistas semiestructuradas y una técnica de asociación libre de palabras. Resultados: surgieron tres unidades temáticas: La representación de la enfermedad para los cristianos católicos; La religión católica como fundamento en el proceso de la enfermedad; Representación de la enfermedad para los católicos: enfermedades adquiridas por la ruptura de las leyes de Dios. Consideraciones finales: la religiosidad es una parte importante de la vida cotidiana de las personas y debe ser respetada independientemente de la creencia del profesional.

A neurophysiological signature of dynamic emotion recognition associated with social communication skills and cortical gamma-aminobutyric acid levels in children.

Introduction: Emotion recognition is a core feature of social perception. In particular, perception of dynamic facial emotional expressions is a major feature of the third visual pathway. However, the classical N170 visual evoked signal does not provide a pure correlate of such processing. Indeed, independent component analysis has demonstrated that the N170 component is already active at the time of the P100, and is therefore distorted by early components. Here we implemented, a dynamic face emotional paradigm to isolate a more pure face expression selective N170. We searched for a neural correlate of perception of dynamic facial emotional expressions, by starting with a face baseline from which a facial expression evolved. This allowed for a specific facial expression contrast signal which we aimed to relate with social communication abilities and cortical gamma-aminobutyric acid (GABA) levels. Methods: We recorded event-related potentials (ERPs) and Magnetic Resonance (MRS) measures in 35 typically developing (TD) children, (10-16 years) sex-matched, during emotion recognition of an avatar morphing/unmorphing from neutral to happy/sad expressions. This task allowed for the elimination of the contribution low-level visual components, in particular the P100, by morphing baseline isoluminant neutral faces into specific expressions, isolating dynamic emotion recognition. Therefore, it was possible to isolate a dynamic face sensitive N170 devoid of interactions with earlier components. Results: We found delayed N170 and P300, with a hysteresis type of dependence on stimulus trajectory (morphing/unmorphing), with hemispheric lateralization. The delayed N170 is generated by an extrastriate source, which can be related to the third visual pathway specialized in biological motion processing. GABA levels in visual cortex were related with N170 amplitude and latency and predictive of worse social communication performance (SCQ scores). N170 latencies reflected delayed processing speed of emotional expressions and related to worse social communication scores. Discussion: In sum, we found a specific N170 electrophysiological signature of dynamic face processing related to social communication abilities and cortical GABA levels. These findings have potential clinical significance supporting the hypothesis of a spectrum of social communication abilities and the identification of a specific face-expression sensitive N170 which can potentially be used in the development of diagnostic and intervention tools.

Ultrasensitive dopamine detection with graphene aptasensor multitransistor arrays.

Detecting physiological levels of neurotransmitters in biological samples can advance our understanding of brain disorders and lead to improved diagnostics and therapeutics. However, neurotransmitter sensors for real-world applications must reliably detect low concentrations of target analytes from small volume working samples. Herein, a platform for robust and ultrasensitive detection of dopamine, an essential neurotransmitter that underlies several brain disorders, based on graphene multitransistor arrays (gMTAs) functionalized with a selective DNA aptamer is presented. High-yield scalable methodologies optimized at the wafer level were employed to integrate multiple graphene transistors on small-size chips (4.5 × 4.5 mm). The multiple sensor array configuration permits independent and simultaneous replicate measurements of the same sample that produce robust average data, reducing sources of measurement variability. This procedure allowed sensitive and reproducible dopamine detection in ultra-low concentrations from small volume samples across physiological buffers and high ionic strength complex biological samples. The obtained limit-of-detection was 1 aM (10-18) with dynamic detection ranges spanning 10 orders of magnitude up to 100 µM (10-8), and a 22 mV/decade peak sensitivity in artificial cerebral spinal fluid. Dopamine detection in dopamine-depleted brain homogenates spiked with dopamine was also possible with a LOD of 1 aM, overcoming sensitivity losses typically observed in ion-sensitive sensors in complex biological samples. Furthermore, we show that our gMTAs platform can detect minimal changes in dopamine concentrations in small working volume samples (2 µL) of cerebral spinal fluid samples obtained from a mouse model of Parkinson's Disease. The platform presented in this work can lead the way to graphene-based neurotransmitter sensors suitable for real-world academic and pre-clinical pharmaceutical research as well as clinical diagnosis.

Chronic stress causes striatal disinhibition mediated by SOM-interneurons in male mice.

Chronic stress (CS) is associated with a number of neuropsychiatric disorders, and it may also contribute to or exacerbate motor function. However, the mechanisms by which stress triggers motor symptoms are not fully understood. Here, we report that CS functionally alters dorsomedial striatum (DMS) circuits in male mice, by affecting GABAergic interneuron populations and somatostatin positive (SOM) interneurons in particular. Specifically, we show that CS impairs communication between SOM interneurons and medium spiny neurons, promoting striatal overactivation/disinhibition and increased motor output. Using probabilistic machine learning to analyze animal behavior, we demonstrate that in vivo chemogenetic manipulation of SOM interneurons in DMS modulates motor phenotypes in stressed mice. Altogether, we propose a causal link between dysfunction of striatal SOM interneurons and motor symptoms in models of chronic stress.