Preclinical Evidences for an Antimanic Effect of Carvedilol.

Oxidative imbalance, alterations in brain-derived neurotrophic factor (BDNF), and mitochondrial dysfunction are implicated in bipolar disorder (BD) pathophysiology and comorbidities, for example, cardiovascular conditions. Carvedilol (CVD), a nonselective beta-blocker widely used for the treatment of hypertension, presents antioxidant and mitochondrial stabilizing properties. Thus, we hypothesized that CVD would prevent and/or reverse mania-like behavioral and neurochemical alterations induced by lisdexamfetamine dimesylate (LDX). To do this, male Wistar rats were submitted to two different protocols, namely, prevention and reversal. In the prevention treatment the rats received daily oral administration (mg/kg) of CVD (2.5, 5 or 7.5), saline, valproate (VAL200), or the combination of CVD5 + VAL100 for 7 days. From the 8th to 14th day LDX was added. In the reversal protocol LDX was administered for 7 days with the drugs being added from the 8th to 14th day of treatment. Two hours after the last administration the behavioral (open field and social interaction) and neurochemical (reduced glutathione, lipid peroxidation, and BDNF) determinations were performed. The results showed that CVD prevented and reversed the behavioral and neurochemical alterations induced by LDX. The administration of CVD5 + VAL100 potentiated the effect of VAL200 alone. Taken together these results demonstrate a possible antimanic effect of CVD in this preclinical model.

Central effects of lipoic acid associated with paroxetine in mice.

Antidepressants, including selective serotonin reuptake inhibitors, are commonly prescribed for the treatment of affective disorders such as anxiety and depression. The purpose of this study was to investigate the central effects of acute administration of paroxetine (PXT) combined with lipoic acid (LA) on various behavioral models in mice. Paroxetine (10 and 20 mg/kg), LA (100 mg/kg), or vehicle was administered, intraperitoneally, 30 minutes before the tests. The results showed that PXT (10 mg/kg) alone and in combination with LA increased locomotor activity. In the anxiety models studied, an anxiolytic effect was observed after the administration of LA and PXT. In the tail suspension test, PXT at both doses and in combination with LA caused a significant decrease in immobility time. These results indicate possible anxiolytic and antidepressant effects of LA associated with PXT. These data suggest that coadministration of LA and PXT may improve anxiolytic and antidepressant responses, and being more effective than each drug alone. However, further studies are necessary to investigate the mechanism by which antioxidants exert antidepressant or anxiolytic action.

Sex and the Estrous-Cycle Phase Influence the Expression of G Protein-Coupled Estrogen Receptor 1 (GPER) in Schizophrenia: Translational Evidence for a New Target.

Schizophrenia is a mental disorder with sex bias in disease onset and symptom severity. Recently, it was observed that females present more severe symptoms in the perimenstrual phase of the menstrual cycle. The administration of estrogen also alleviates schizophrenia symptoms. Despite this, little is known about symptom fluctuation over the menstrual cycle and the underlying mechanisms. To address this issue, we worked with the two-hit schizophrenia animal model induced by neonatal exposure to a virus-like particle, Poly I:C, associated with peripubertal unpredictable stress exposure. Prepulse inhibition of the startle reflex (PPI) in male and female mice was considered analogous to human schizophrenia-like behavior. Female mice were studied in the proestrus (high-estrogen estrous cycle phase) and diestrus (low-estrogen phase). Additionally, we evaluated the hippocampal mRNA expression of estrogen synthesis proteins; TSPO and aromatase; and estrogen receptors ERα, ERß, and GPER. We also collected peripheral blood mononuclear cells (PBMCs) from male and female patients with schizophrenia and converted them to induced microglia-like cells (iMGs) to evaluate the expression of GPER. We observed raised hippocampal expression of GPER in two-hit female mice at the proestrus phase without PPI deficits and higher levels of proteins related to estrogen synthesis, TSPO, and aromatase. In contrast, two-hit adult males with PPI deficits presented lower hippocampal mRNA expression of TSPO, aromatase, and GPER. iMGs from male and female patients with schizophrenia showed lower mRNA expression of GPER than controls. Therefore, our results suggest that GPER alterations constitute an underlying mechanism for sex influence in schizophrenia.

Low-dose candesartan prevents schizophrenia-like behavioral alterations in a neurodevelopmental two-hit model of schizophrenia.

Schizophrenia is a severe mental disorder with complex etiopathogenesis. Based on its neurodevelopmental features, an animal model induced by "two-hit" based on perinatal immune activation followed by peripubertal unpredictable stress was proposed. Sex influences the immune response, and concerning schizophrenia, it impacts the age of onset and symptoms severity. The neurobiological mechanisms underlying the influence of sex in schizophrenia is poorly understood. Our study aimed to evaluate sex influence on proinflammatory and oxidant alterations in male and female mice exposed to the two-hit model of schizophrenia, and its prevention by candesartan, an angiotensin II type 1 receptor (AT1R) blocker with neuroprotective properties. The two-hit model induced schizophrenia-like behavioral changes in animals of both sexes. Hippocampal microglial activation alongside the increased expression of NF-κB, and proinflammatory cytokines, namely interleukin (IL)-1ß and TNF-α, were observed in male animals. Conversely, females presented increased hippocampal and plasma levels of nitrite and plasma lipid peroxidation. Peripubertal administration of low-dose candesartan (0.3 mg/kg PO) prevented behavioral, hippocampal, and systemic changes in male and female mice. While these results indicate the influence of sex on inflammatory and oxidative changes induced by the two-hit model, candesartan was effective in both males and females. The present study advances the neurobiological mechanisms underlying sex influence in schizophrenia and opens new avenues to prevent this devasting mental disorder.

Sex influences in the preventive effects of N-acetylcysteine in a two-hit animal model of schizophrenia.

BACKGROUND: Schizophrenia (SCZ) is a neurodevelopmental disorder influenced by patient sex. Mechanisms underlying sex differences in SCZ remain unknown. A two-hit model of SCZ combines the exposure to perinatal infection (first-hit) with peripubertal unpredictable stress (PUS, second-hit). N-acetylcysteine (NAC) has been tested in SCZ because of the involvement of glutathione mechanisms in its neurobiology. AIMS: We aim to investigate whether NAC administration to peripubertal rats of both sexes could prevent behavioral and neurochemical changes induced by the two-hit model. METHODS: Wistar rats were exposed to polyinosinic:polycytidylic acid (a viral mimetic) or saline on postnatal days (PND) 5-7. On PND30-59 they received saline or NAC 220 mg/kg and between PND40-48 were subjected to PUS or left undisturbed. On PND60 behavioral and oxidative alterations were evaluated in the prefrontal cortex (PFC) and striatum. Mechanisms of hippocampal memory regulation such as immune expression of G protein-coupled estrogen receptor 1 (GPER), α7-nAChR and parvalbumin were also evaluated. RESULTS: NAC prevented sensorimotor gating deficits only in females, while it prevented alterations in social interaction, working memory and locomotor activity in both sexes. Again, in rats of both sexes, NAC prevented the following neurochemical alterations: glutathione (GSH) and nitrite levels in the PFC and lipid peroxidation in the PFC and striatum. Striatal oxidative alterations in GSH and nitrite were observed in females and prevented by NAC. Two-hit induced hippocampal alterations in females, namely expression of GPER-1, α7-nAChR and parvalbumin, were prevented by NAC. CONCLUSION: Our results highlights the influences of sex in NAC preventive effects in rats exposed to a two-hit schizophrenia model.

Análise da automedicação pediátrica em pacientes atendidos em hospital de alta complexidade / Analysis of pediatric self-medication in patients treated at a highcomplexity hospital

A automedicação pediátrica ocorre quando pais ou responsáveis usam medicamentos sem prescrição para tratar doenças ou sintomas reconhecidos nas crianças. Analisar o perfil da automedicação pediátrica em um hospital de alta complexidade no interior do Ceará. Trata-se de um estudo transversal baseado na técnica de entrevista, realizado com 135 pais/responsáveis de crianças com idade entre 0 a 12 anos que procuraram atendimento hospitalar entre novembro de 2020 e março de 2021. Observou-se uma prevalência de automedicação de 60%. Quanto à frequência, 43,2% dos entrevistados relataram realizar às vezes. Destes, a maioria era: mãe (94,3%; p<0,0001), com 17 a 27 anos (48,6%; p<0,0001) e renda familiar de menos de 1 salário mínimo (57,1%; p=0,020); 59,3% apontaram como motivo considerar o problema de saúde simples. A principal causa da automedicação foi a febre e os medicamentos mais utilizados foram analgésicos e antipiréticos. A predominância da automedicação pediátrica pelas mães deve-se à experiência com seus outros filhos. Além disso, as condições socioeconômicas influenciaram as práticas errôneas da automedicação, pois as famílias que não possuem recursos para a consulta e compra dos fármacos acabam optando pela autoadministração. O uso indiscriminado de medicações deve ser reprimido, pois, a depender da dose, consequências graves podem ocorrer às crianças. Destaca-se a importância da equipe multiprofissional de saúde durante uma consulta pediátrica, com médicos, enfermeiros e farmacêuticos repassando aos pais informações a respeito dos medicamentos, seus benefícios e riscos, desestimulando a prática nesta faixa populacional e reduzindo os erros de medicação.

Pediatric self-medication occurs when parents or guardians use over-the-counter medications to treat recognized illnesses or symptoms in children. To analyze the profile of pediatric self-medication in a high-complexity hospital in the interior of Ceará. This is a cross-sectional study based on the interview technique, carried out with 135 parents/guardians of children aged 0 to 12 years old who sought hospital care between November 2020 and March 2021. There was a prevalence of self-medication of 60%. As for frequency, 43.2% of respondents reported doing it sometimes. Of these, the majority were: mothers (94.3%; p<0.0001); aged 17 to 27 years old (48.6%; p<0.0001); family income of less than 1 minimum wage (57.1 %; p=0.020); and 59.3% indicated that their reason for medicating was that they considered the health problem as simple. The main cause of self-medication was fever, and the most used drugs were analgesics and antipyretics. The predominance of pediatric self-medication by mothers is due to their experience with their other children. In addition, socioeconomic conditions influenced the erroneous practices of self-medication, as families that do not have the resources to consult and purchase drugs end up opting for self-administration. The indiscriminate use of medications must be repressed, because, depending on the dose, serious consequences can occur to children. The importance of a multidisciplinary health team during a pediatric consultation is highlighted, with doctors, nurses, and pharmacists providing parents with information about medication, their benefits and risks, discouraging the practice in this population group and reducing medication errors.

Reversal of schizophrenia-like symptoms and immune alterations in mice by immunomodulatory drugs.

Immune dysregulation observed in schizophrenia alters tryptophan metabolism. Tryptophan metabolism is triggered by indoleamine 2,3-dioxygenase (IDO) and tryptophan 2,3-dioxygenase (TDO). Tryptophan is converted to quinolinic acid, a potent neurotoxin, and to kynurenic acid, an NMDA antagonist. 1-Methyl-D-tryptophan (MDT) inhibits IDO. Melatonin is metabolized by IDO while inhibiting TDO. We evaluated the reversal of ketamine-induced schizophrenia-like behavioral and neurochemical alterations in mice by the administration of MDT (20 or 40 mg/kg, i.p.) or melatonin (15 mg/kg, per os). Oxidative stress and inflammatory alterations, i.e. myeloperoxidase activity (MPO), reduced glutathione (GSH), lipid peroxidation (LPO) and interleukin (IL)-4 and IL-6 were measured in the prefrontal cortex (PFC), hippocampus and striatum. Risperidone was used as standard antipsychotic. Ketamine triggered positive- (PPI deficits and hyperlocomotion), cognitive- (working memory deficits) and negative (social interaction deficits) schizophrenia-like symptoms. These symptoms were accompanied by increased MPO activity, decreased GSH and increased LPO in all brain areas and increments in hippocampal IL-4 and IL-6. MDT and melatonin reversed all ketamine-induced behavioral alterations. Risperidone did not reverse working memory deficits. MDT and melatonin reversed alterations in MPO activity and GSH levels. LP was reversed only by melatonin and risperidone. Risperidone could not reverse MPO alterations in the PFC and striatum. All drugs reversed the alterations in IL-4 and IL-6. The hippocampus and striatum of ketamine+melatonin-treated animals had lower levels of IL-6. Our findings provide further preclinical evidence that immune-inflammatory and oxidative pathways are involved in schizophrenia and that targeting these pathways is a valid treatment option in schizophrenia.

Two-hit model of schizophrenia induced by neonatal immune activation and peripubertal stress in rats: Study of sex differences and brain oxidative alterations.

Schizophrenia is considered to be a developmental disorder with distinctive sex differences. Aiming to simulate the vulnerability of the third trimester of human pregnancy to the developmental course of schizophrenia, an animal model was developed, using neonatal poly(I:C) as a first-hit, and peripubertal stress as a second-hit, i.e. a two-hit model. Since, to date, there have been no references to sex differences in the two-hit model, our study sought to determine sex influences on the development of behavior and brain oxidative change in adult rats submitted to neonatal exposure to poly(I:C) on postnatal days 5-7 as well as peripubertal unpredictable stress (PUS). Our results showed that adult two-hit rats present sex-specific behavioral alterations, with females showing more pronounced deficits in prepulse inhibition of the startle reflex and hyperlocomotion, while males showing more deficits in social interaction. Male and female animals exhibited similar working memory deficits. The levels of the endogenous antioxidant, reduced glutathione, were decreased in the prefrontal cortex (PFC) of both male and female animals exposed to both poly(I:C) and poly(I:C)+PUS. Only females presented decrements in GSH levels in the striatum. Nitrite levels were increased in the PFC of male and in the striatum of female poly(I:C)+PUS rats. Increased lipid peroxidation was observed in the PFC of females and in the striatum of males and females exposed to poly(I:C) and poly(I:C)+PUS. Thus, the present study presents evidence for sex differences in behavior and oxidative brain change induced by a two-hit model of schizophrenia.

Análise epidemiológica dos candidatos à doação de órgãos nos estados do Ceará, São Paulo e Acre / Epidemiological analysis of candidates for the donation of organs in the states of Ceará, São Paulo and Acre / Análisis epidemiológica de los candidatos a la donación de órganos en los estados del Ceará, São Paulo y Acre

Objetivo: Analisar aspectos epidemiológicos de candidatos a doação de órgãos do Ceará, comparando com os estados de melhor e pior desempenho quanto ao transplante. Método: Estudo Transversal descritivo com abordagem quantitativa realizado com dados do Registro Brasileiro de Transplantes publicados em 2016. Resultados: O pior e melhor estado em relação às doações de órgãos foram Acre e São Paulo, respectivamente. O número de doadores efetivos por milhão de população no Ceará foi superior ao de São Paulo. A recusa familiar representou a maioria das causas de não concretização dos transplantes nos três estados. O Acidente Vascular Cerebral foi a principal causa de morte em São Paulo e Acre, enquanto no Ceará foi o Traumatismo crânio encefálico. Ceará e Acre apresentaram faixa etária predominante de 18-34 anos. Conclusão: O desempenho do Ceará quando comparado com os outros estados foi superior em relação a transformação de potenciais doadores em doadores efetivos

Objective: To analyze the epidemiological aspects of candidates for donation of organs from Ceará, comparing them with the best and worst performing states regarding transplantation. Methods: A descriptive cross-sectional study with a quantitative approach was performed with data from the Brazilian Transplant Registry published in 2016. Results: The worst and best condition in relation to organ donations were Acre and São Paulo, respectively. The number of effective donors per million population in Ceará was higher than in São Paulo. Family refusal accounted for most of the causes of non-transplantation in the three states. Cerebral Vascular Accident was the main cause of death in São Paulo and Acre, while in Ceará it was traumatic brain injury. Ceará and Acre had a predominant age group of 18-34 years. Conclusion: The performance of Ceará when compared to the other states was higher in relation to the transformation of potential donors into effective donors

Objetivo: Analizar aspectos epidemiológicos de candidatos a la donación de órganos de Ceará, comparando con los estados de mejor y peor desempeño en cuanto al trasplante. Métodos: Estudio Transversal descriptivo con abordaje cuantitativo realizado con datos del Registro Brasileño de Trasplantes publicados en 2016. Resultados: El peor y mejor estado en relación a las donaciones de órganos fueron Acre y São Paulo, respectivamente. El número de donantes efectivos por millón de población en Ceará fue superior al de São Paulo. La negativa familiar representó la mayoría de las causas de no concreción de los trasplantes en los tres estados. El Accidente Vascular Cerebral fue la principal causa de muerte en São Paulo y Acre, mientras que en Ceará fue el Traumatismo cráneo encefálico. Ceará y Acre presentaron rango de edad predominante de 18- 34 años. Conclusión: El desempeño de Ceará cuando comparado con los otros estados fue superior en relación a la transformación de potenciales donantes en donantes efectivos

Prevention and reversal of ketamine-induced schizophrenia related behavior by minocycline in mice: Possible involvement of antioxidant and nitrergic pathways.

It has been hypothesized that oxidative imbalance and alterations in nitrergic signaling play a role in the neurobiology of schizophrenia. Preliminary evidence suggests that adjunctive minocycline treatment is efficacious for cognitive and negative symptoms of schizophrenia. This study investigated the effects of minocycline in the prevention and reversal of ketamine-induced schizophrenia-like behaviors in mice. In the reversal protocol, animals received ketamine (20 mg/kg per day intraperitoneally or saline for 14 days, and minocycline (25 or 50 mg/kg daily), risperidone or vehicle treatment from days 8 to 14. In the prevention protocol, mice were pretreated with minocycline, risperidone or vehicle prior to ketamine. Behaviors related to positive (locomotor activity and prepulse inhibition of startle), negative (social interaction) and cognitive (Y maze) symptoms of schizophrenia were also assessed. Glutathione (GSH), thiobarbituric acid-reactive substances (TBARS) and nitrite levels were measured in the prefrontal cortex, hippocampus and striatum. Minocycline and risperidone prevented and reversed ketamine-induced alterations in behavioral paradigms, oxidative markers (i.e. ketamine-induced decrease and increase in GSH levels and TBARS content, respectively) as well as nitrite levels in the striatum. These data provide a rationale for evaluating minocycline as a novel psychotropic agent and suggest that its mechanism of action includes antioxidant and nitrergic systems.

Effects of doxycycline on depressive-like behavior in mice after lipopolysaccharide (LPS) administration.

Current evidences support inflammation, oxidative and nitrogen stress, as well as brain-derived neurotrophic factor (BDNF) signaling mechanisms as important in depression pathophysiology. Tetracycline antibiotics have anti-inflammatory and antioxidant properties. Preliminary evidence indicates that minocycline has antidepressant properties. Doxycycline (DOXY) has favorable pharmacokinetic and safety profiles when compared to other tetracycline congeners. The antidepressant activity of DOXY has not been adequately investigated. This study evaluated the effects of DOXY (25 and 50 mg/kg, i.p.) on LPS-induced (0.5 mg/kg, i.p.) depressive-like behavior. Doxycycline was administered 30 min before LPS (pre-LPS) or 1.5 and 23.5 h following LPS (post-LPS) administration in mice. LPS-treated animals presented an increase in immobility time in the forced swimming test (FST) when compared to controls 24 h after endotoxin administration. Similarly to imipramine (IMI-10 mg/kg, i.p.), DOXY at both doses prevented and reversed LPS-induced alterations in the FST. IL-1ß content was increased 24 h after LPS administration in striatum, hippocampus and prefrontal cortex. IMI and DOXY prevented and reversed LPS-induced increase in IL-1ß. IMI and DOXY also prevented and reversed LPS-induced alterations in nitrite content and oxidative stress parameters (lipid peroxidation and reduced glutathione levels). Both DOXY and IMI prevented LPS-induced decrease in hippocampal BDNF levels. Taken together, our results demonstrate that DOXY is comparable to IMI in effectively ameliorate LPS-induced depressive-like behavior, providing a rationale for testing DOXY's antidepressant efficacy in humans.

Evidences for a progressive microglial activation and increase in iNOS expression in rats submitted to a neurodevelopmental model of schizophrenia: reversal by clozapine.

Schizophrenia was proposed as a progressive neurodevelopmental disorder. In this regard herein we attempted to determine progressive inflammatory and oxidative alterations induced by a neonatal immune challenge and its possible reversal by clozapine administration. For this end, Wistar rats at postnatal day (PN) 5-7 were administered the viral mimetic polyriboinosinic-polyribocytidilic acid (polyI:C) or saline. A distinct group of animals additionally received the antipsychotic drug clozapine (25mg/kg) from PN60 to 74. At PN35 (periadolescence), 60 (adult) and 74 (adulthood) the animals were submitted to behavioral determinations of prepulse inhibition of the startle (PPI) and Y maze task for working memory evaluation. At PN35 and 74 the animals were sacrificed and the hippocampus (HC), prefrontal cortex (PFC) and striatum (ST) immunostained for Iba-1, a microglial marker, and inducible nitric oxide synthase (iNOS). At PN74 oxidative stress parameters, such as, reduced glutathione levels (GSH) and lipid peroxidation were determined. The results showed a progressive increase of microglial activation and iNOS immunostaining from PN35 to PN74 mainly in the CA2 and CA3 regions of the HC and in the ST. At PN74 neonatal challenge also induced an oxidative imbalance. These inflammatory alterations were accompanied by deficits in PPI and working memory only in adult life that were reversed by clozapine. Clozapine administration reversed microglial activation and iNOS increase, but not the alterations of oxidative stress parameters. Taken together these results give further evidences for a neuroprogressive etiology and course of schizophrenia and that clozapine may partly alleviate this process.