Objective: To evaluate the factor structure, reliability, and validity of the Brazilian version of the Suicide Crisis Inventory-2 (SCI-2) among Brazilian adults. Methods: The SCI-2 was cross-culturally adapted into Portuguese and administered to 2,265 Brazilian participants. Confirmatory factor analysis (CFA) was used to assess factor structure, internal consistency, convergent validity, and criterion validity by using measures such as suicidal narratives, stressful life events, suicidal ideation, and suicide attempts. Results: The revised one-factor model of the SCI-2 demonstrated an adequate, although not optimal, model fit (χ2[1539] = 31,442.79, p < 0.001, comparative fit index [CFI] = 0.99, Tucker-Lewis index [TLI] = 0.99, root mean square error of approximation [RMSEA] = 0.09, standardized root mean residual [SRMR] = 0.05). The revised five-factor model, on the other hand, demonstrated good fit (χ2[1529] = 14,174.86, p < 0.001, CFI = 1.00, TLI = 1.00, RMSEA = 0.06, SRMR = 0.04). Comparison of these two models indicated that the five-factor model had a better fit than the one-factor model. Both the total and subscale scores of the SCI-2 showed strong internal consistency and good convergent and criterion validity in relation to stressful life events, suicidal narratives (excluding the goal disengagement subscale), suicidal ideation, and suicide attempts. Conclusion: Our findings suggest that the Brazilian version of the SCI-2 is a valid tool for assessing symptoms of suicidal crisis syndrome. Objective structure reliability Inventory2 Inventory 2 Inventory- SCI2 SCI (SCI-2 adults Methods SCI- crossculturally cross culturally 2265 265 2,26 participants CFA (CFA events ideation attempts Results onefactor one adequate optimal χ21539 χ χ2 1539 (χ2[1539 3144279 31 442 79 31,442.79 0001 0 001 0.001 [CFI 099 99 0.99 TuckerLewis Tucker Lewis [TLI [RMSEA 009 09 0.09 [SRMR 0.05. 005 0.05 . 05 0.05) fivefactor five hand χ21529 1529 (χ2[1529 1417486 14 174 86 14,174.86 100 1 00 1.00 006 06 0.06 0.04. 004 0.04 04 0.04) excluding subscale, , subscale) Conclusion syndrome (SCI- 226 26 2,2 χ2153 153 (χ2[153 314427 3 44 7 31,442.7 000 0.00 9 0.9 0.0 χ2152 152 (χ2[152 141748 17 8 14,174.8 10 1.0 (SCI 22 2, χ215 15 (χ2[15 31442 4 31,442. 0. 14174 14,174. 1. χ21 (χ2[1 3144 31,442 1417 14,174 (χ2[ 314 31,44 141 14,17 (χ2 31,4 14,1 (χ 31, 14,

Objective: To evaluate the factor structure, reliability, and validity of the Brazilian version of the Suicide Crisis Inventory-2 (SCI-2) among Brazilian adults. Methods: The SCI-2 was cross-culturally adapted into Portuguese and administered to 2,265 Brazilian participants. Confirmatory factor analysis (CFA) was used to assess factor structure, internal consistency, convergent validity, and criterion validity by using measures such as suicidal narratives, stressful life events, suicidal ideation, and suicide attempts. Results: The revised one-factor model of the SCI-2 demonstrated an adequate, although not optimal, model fit (χ2[1539] = 31,442.79, p < 0.001, comparative fit index [CFI] = 0.99, Tucker-Lewis index [TLI] = 0.99, root mean square error of approximation [RMSEA] = 0.09, standardized root mean residual [SRMR] = 0.05). The revised five-factor model, on the other hand, demonstrated good fit (χ2[1529] = 14,174.86, p < 0.001, CFI = 1.00, TLI = 1.00, RMSEA = 0.06, SRMR = 0.04). Comparison of these two models indicated that the five-factor model had a better fit than the one-factor model. Both the total and subscale scores of the SCI-2 showed strong internal consistency and good convergent and criterion validity in relation to stressful life events, suicidal narratives (excluding the goal disengagement subscale), suicidal ideation, and suicide attempts. Conclusion: Our findings suggest that the Brazilian version of the SCI-2 is a valid tool for assessing symptoms of suicidal crisis syndrome. Objective structure reliability Inventory2 Inventory 2 Inventory- SCI2 SCI (SCI-2 adults Methods SCI- crossculturally cross culturally 2265 265 2,26 participants CFA (CFA events ideation attempts Results onefactor one adequate optimal χ21539 χ χ2 1539 (χ2[1539 3144279 31 442 79 31,442.79 0001 0 001 0.001 [CFI 099 99 0.99 TuckerLewis Tucker Lewis [TLI [RMSEA 009 09 0.09 [SRMR 0.05. 005 0.05 . 05 0.05) fivefactor five hand χ21529 1529 (χ2[1529 1417486 14 174 86 14,174.86 100 1 00 1.00 006 06 0.06 0.04. 004 0.04 04 0.04) excluding subscale, , subscale) Conclusion syndrome (SCI- 226 26 2,2 χ2153 153 (χ2[153 314427 3 44 7 31,442.7 000 0.00 9 0.9 0.0 χ2152 152 (χ2[152 141748 17 8 14,174.8 10 1.0 (SCI 22 2, χ215 15 (χ2[15 31442 4 31,442. 0. 14174 14,174. 1. χ21 (χ2[1 3144 31,442 1417 14,174 (χ2[ 314 31,44 141 14,17 (χ2 31,4 14,1 (χ 31, 14,

Abstract This article aims to examine differences in suicidal narrative and suicide crisis syndrome symptoms, and suicidal ideation among those who maintained, lost, and gained employment or student status during the COVID-19 pandemic. It is a cross-sectional study based on an online and anonymous self-report questionnaire. Participants were recruited through social media platforms between November 2020 and October 2021. Changes in occupational status were assessed in 2,259 individuals. The sample was divided into four groups according to work (full-time/part-time) and study status (1) maintained, (2) lost, (3) gained, and (4) unemployed. Suicide outcomes were investigated by the Suicidal Narrative Inventory, Suicide Crisis Inventory, and Columbia - Suicide Severity Rating Scale Screener version. Changes in occupational status influenced symptoms of the suicide crisis syndrome and suicidal narrative, but not suicidal ideation. Those who maintained their work, such as full-time/part-time scored lower on the total scores of the Suicidal Narrative Inventory and Suicide Crisis Inventory-2 compared to those who lost their employed status and unemployed. Our findings suggest that it is appropriate to consider changes in employed status as a mental health risk factor during pandemics. COVID19 COVID 19 COVID-1 pandemic crosssectional cross sectional selfreport self report questionnaire 202 2021 2259 2 259 2,25 individuals fulltime/parttime fulltimeparttime full time/part time part (full-time/part-time 1 (1 (2 3 (3 4 (4 unemployed version Inventory2 Inventory- pandemics COVID1 COVID- 20 225 25 2,2 fulltime parttime timepart ( 22 2,

Resumo O objetivo do artigo é examinar diferenças nos sintomas da narrativa suicida e da síndrome de crise de suicídio e ideação suicida entre aqueles que mantiveram, perderam e ganharam emprego ou status educacional durante a pandemia de COVID-19. Trata-se de um estudo transversal baseado em um questionário online. Os indivíduos foram recrutados por meio de plataformas de mídia social entre novembro de 2020 e outubro de 2021. As mudanças no status ocupacional foram avaliadas em 2.259 indivíduos. A amostra foi dividida em grupos de acordo com as mudanças do status ocupacional: (1) aqueles que mantiveram, (2) aqueles que perderam, (3) aqueles que ganharam e (4) desempregados. Desfechos suicidas foram avaliados através do Inventário da Narrativa Suicida, Inventário da Crise Suicida e Columbia - Escala de Classificação da Gravidade do Suicídio. Mudanças no status ocupacional influenciaram sintomas da síndrome de crise de suicídio e narrativa suicida, mas não a ideação suicida. Aqueles que mantiveram seu emprego apresentaram menos sintomas de narrativa suicida e síndrome de crise de suicídio, comparados aos que perderam o emprego e aos desempregados. Esses achados sugerem que é apropriado considerar mudanças no status ocupacional como fator de risco para saúde mental durante pandemias. COVID19. COVID19 COVID 19. 19 COVID-19 Tratase Trata se online 202 2021 2259 2 259 2.25 1 (1 (2 3 (3 4 (4 desempregados Suicídio pandemias COVID1 COVID-1 20 225 25 2.2 ( COVID- 22 2.

Abstract This article aims to examine differences in suicidal narrative and suicide crisis syndrome symptoms, and suicidal ideation among those who maintained, lost, and gained employment or student status during the COVID-19 pandemic. It is a cross-sectional study based on an online and anonymous self-report questionnaire. Participants were recruited through social media platforms between November 2020 and October 2021. Changes in occupational status were assessed in 2,259 individuals. The sample was divided into four groups according to work (full-time/part-time) and study status (1) maintained, (2) lost, (3) gained, and (4) unemployed. Suicide outcomes were investigated by the Suicidal Narrative Inventory, Suicide Crisis Inventory, and Columbia - Suicide Severity Rating Scale Screener version. Changes in occupational status influenced symptoms of the suicide crisis syndrome and suicidal narrative, but not suicidal ideation. Those who maintained their work, such as full-time/part-time scored lower on the total scores of the Suicidal Narrative Inventory and Suicide Crisis Inventory-2 compared to those who lost their employed status and unemployed. Our findings suggest that it is appropriate to consider changes in employed status as a mental health risk factor during pandemics.

Resumo O objetivo do artigo é examinar diferenças nos sintomas da narrativa suicida e da síndrome de crise de suicídio e ideação suicida entre aqueles que mantiveram, perderam e ganharam emprego ou status educacional durante a pandemia de COVID-19. Trata-se de um estudo transversal baseado em um questionário online. Os indivíduos foram recrutados por meio de plataformas de mídia social entre novembro de 2020 e outubro de 2021. As mudanças no status ocupacional foram avaliadas em 2.259 indivíduos. A amostra foi dividida em grupos de acordo com as mudanças do status ocupacional: (1) aqueles que mantiveram, (2) aqueles que perderam, (3) aqueles que ganharam e (4) desempregados. Desfechos suicidas foram avaliados através do Inventário da Narrativa Suicida, Inventário da Crise Suicida e Columbia - Escala de Classificação da Gravidade do Suicídio. Mudanças no status ocupacional influenciaram sintomas da síndrome de crise de suicídio e narrativa suicida, mas não a ideação suicida. Aqueles que mantiveram seu emprego apresentaram menos sintomas de narrativa suicida e síndrome de crise de suicídio, comparados aos que perderam o emprego e aos desempregados. Esses achados sugerem que é apropriado considerar mudanças no status ocupacional como fator de risco para saúde mental durante pandemias.

Objective: To test the factor structure, reliability, and validity of the Brazilian version of the Abbreviated Suicidal Narrative Inventory (SNI-38). Methods: We used an anonymous online questionnaire of the SNI-38 and self-report measures administered between November 2020 and October 2021 in the Brazilian community. Participants were recruited through social media advertisements. Confirmatory factor analysis (CFA) was performed to test the factor structure of the SNI-38. In addition, we assessed internal consistency and convergent validity against stressful life events, suicide crisis syndrome, suicidal ideation, and suicide attempts. Results: A total of 2,660 participants were included. The eight-factor model of the SNI-38 had a good model fit (χ2[637] = 7,473.98, p < 0.001, comparative fit index [CFI] = 0.99, Tucker-Lewis index [TLI] = 0.99, root mean squared error of approximation [RMSEA] = 0.07, standardized root mean residual [SRMR] = 0.06). Notably, all items were significantly and positively loaded onto their respective factors (factor loadings ≥ 0.45). The reliability of all subscales except for goal disengagement ranged from good to high. Furthermore, all subscales except goal disengagement showed positive correlations with variables such as suicide crisis syndrome, stressful life events, lifetime/past month suicidal ideation, and lifetime suicide attempts. Conclusion: These findings provide preliminary support for the validity of the Brazilian version of the SNI-38 as an appropriate, valid instrument for measuring suicidal narratives in Brazilian individuals. Objective SNI38. SNI38 SNI 38 . (SNI-38) Methods SNI-3 selfreport self report 202 community advertisements CFA (CFA 38. addition events syndrome ideation attempts Results 2660 2 660 2,66 included eightfactor eight χ2637 χ χ2 637 (χ2[637 747398 7 473 98 7,473.98 0001 0 001 0.001 CFI [CFI 099 99 0.99 TuckerLewis Tucker Lewis TLI [TLI RMSEA [RMSEA 007 07 0.07 SRMR [SRMR 0.06. 006 0.06 06 0.06) Notably 0.45. 045 0.45 45 0.45) high Furthermore lifetimepast past Conclusion appropriate individuals SNI3 3 (SNI-38 SNI- 20 266 66 2,6 χ263 63 (χ2[63 74739 47 9 7,473.9 000 00 0.00 09 0.9 0.0 04 0.4 4 (SNI-3 26 6 2, χ26 (χ2[6 7473 7,473. 0. (SNI- (χ2[ 747 7,473 (SNI (χ2 74 7,47 (χ 7,4 7,

Bipolar disorder (BD) is a chronic mental illness characterized by changes in mood that alternate between mania and hypomania or between depression and mixed states, often associated with functional impairment. Although effective pharmacological and non-pharmacological treatments are available, several patients with BD remain symptomatic. The advance in the understanding of the neurobiology underlying BD could help in the identification of new therapeutic targets as well as biomarkers for early detection, prognosis, and response to treatment in BD. In this review, we discuss genetic, epigenetic, molecular, physiological and neuroimaging findings associated with the neurobiology of BD. Despite the advances in the pathophysiological knowledge of BD, the diagnosis and management of the disease are still essentially clinical. Given the complexity of the brain and the close relationship between environmental exposure and brain function, initiatives that incorporate genetic, epigenetic, molecular, physiological, clinical, environmental data, and brain imaging are necessary to produce information that can be translated into prevention and better outcomes for patients with BD.

Objective: To evaluate the effects of Hypericum perforatum (hypericum) on cognitive behavior and neurotrophic factor levels in the brain of male and female rats. Methods: Male and female Wistar rats were treated with hypericum or water during 28 days by gavage. The animals were then subjected to the open-field test, novel object recognition and step-down inhibitory avoidance test. Nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), and glial cell-line derived neurotrophic factor (GDNF) levels were evaluated in the hippocampus and frontal cortex. Results: Hypericum impaired the acquisition of short- and long-term aversive memory in male rats, evaluated in the inhibitory avoidance test. Female rats had no immediate memory acquisition and decreased short-term memory acquisition in the inhibitory avoidance test. Hypericum also decreased the recognition index of male rats in the object recognition test. Female rats did not recognize the new object in either the short-term or the long-term memory tasks. Hypericum decreased BDNF in the hippocampus of male and female rats. Hypericum also decreased NGF in the hippocampus of female rats. Conclusions: The long-term administration of hypericum appears to cause significant cognitive impairment in rats, possibly through a reduction in the levels of neurotrophic factors. This effect was more expressive in females than in males.

RESUMO CONTEXTO: Ostomia é um procedimento cirúrgico que cria um estoma com objetivo de construir um novo caminho para a saída das fezes ou urina. A relação dos marcadores de estresse oxidativo em pacientes ostomizados ainda é pouco descrita. OBJETIVO: O presente estudo tem como objetivo investigar as alterações dos parâmetros de estresse oxidativo em sangue de pacientes ostomizados comparados a controles saudáveis. MÉTODOS: Foram avaliados 29 pacientes ostomizados e 30 controles saudáveis. Os parâmetros de estresse oxidativo avaliados foram: peroxidação lipídica [hidroperóxido de lipídio (LPO), 8-isoprostano (8-ISO) e 4-hidroxinonenal (4-HNE)], oxidação e nitração de proteínas [carbonila e 3-nitrotirosina (3-NT)] e oxidação do DNA [8-hidroxi-2’-desoxiguanosina (8-OHDG)] em soro de pacientes ostomizados comparados a controles saudáveis. RESULTADOS: Os dados mostraram um aumento de LPO, 8-ISO, 4-HNE, 3-NT e 8-OHDG em soro de pacientes ostomizados em comparação a controles saudáveis. CONCLUSÃO: Os achados sustentam a hipótese de que a ostomia desencadeia o estresse oxidativo observado no sangue coletado destes pacientes.

ABSTRACT BACKGROUND: Ostomy is a surgical procedure that creates a stoma that aims to construct a new path for the output of feces or urine. The relationship of oxidative stress (OxS) markers in patients with ostomy is still poorly described. OBJECTIVE: The present study was aimed at investigating the changes in oxidative stress parameters in peripheral blood collected from ostomy patients when compared with a healthy control group. METHODS: It was evaluated 29 ostomy patients and 30 healthy control patients. The oxidative stress parameters evaluated were: lipid peroxidation [lipid hydroperoxide (LPO), 8-isoprostane (8-ISO) and 4-hydroxynonenal (4-HNE)], protein oxidation and nitration [carbonyl and 3-nitrotyrosine (3-NT)] and DNA oxidation [8-hydroxy-2’-deoxyguanosine (8-OHDG)] in serum from ostomy patients compared to health controls. RESULTS: The data showed an increase of LPO, 8-ISO, 4-HNE, 3-NT and 8-OHDG in serum collected from ostomy patients when compared to healthy controls. CONCLUSION: The findings support the hypothesis that ostomy triggers the oxidative stress observed in the blood collected from these patients.

O femproporex é o segundo anorexígeno à base de anfetamina mais consumido no mundo; esse fármaco é rapidamente convertido in vivo em anfetamina e atua através do aumento dos níveis de dopamina na fenda sináptica. Considerando que os efeitos do femproporex sobre o Sistema Nervoso Central são ainda pouco conhecidos e que a acetilcolinesterase é uma enzima reguladora envolvida na transmissão colinérgica e que indiretamente pode modular a liberação de dopamina, o presente estudo investigou os efeitos da administração aguda de femproporex sobre a atividade da enzima acetilcolinesterase em cérebro de ratos jovens. Ratos Wistar machos jovens receberam uma única injeção de femproporex (6,25, 12,5 ou 25 mg/kg i.p.) ou veículo (Tween 80 2%). Duas horas após a injeção, os ratos foram mortos por decapitação e o cérebro foi removido para avaliação da atividade da acetilcolinesterase. Os resultados mostraram que a administração de femproporex aumentou a atividade da acetilcolinesterase no hipocampo e córtex posterior, enquanto que no córtex pré-frontal, estriado e cerebelo a atividade da enzima não foi alterada. Em conclusão, o presente estudo demonstrou que a administração aguda de femproporex exerce um efeito no sistema colinérgico causando um aumento na atividade da acetilcolinesterase, de um modo dose dependente, no hipocampo e córtex posterior. Assim, sugere-se que o desequilíbrio na homeostase colinérgica pode ser considerado um importante mecanismo fisiopatológico subjacente ao dano cerebral observado em pacientes que utilizam anfetaminas, como o femproporex.

Fenproporex is the second most commonly amphetamine-based anorectic consumed worldwide; this drug is rapidly converted into amphetamine, in vivo, and acts by increasing dopamine levels in the synaptic cleft. Considering that fenproporex effects on the central nervous system are still poorly known and that acetylcholinesterase is a regulatory enzyme which is involved in cholinergic synapses and may indirectly modulate the release of dopamine, the present study investigated the effects of acute administration of fenproporex on acetylcholinesterase activity in brain of young rats. Young male Wistar rats received a single injection of fenproporex (6.25, 12.5 or 25mg/kg i.p.) or vehicle (2% Tween 80). Two hours after the injection, the rats were killed by decapitation and the brain was removed for evaluation of acetylcholinesterase activity. Results showed that fenproporex administration increased acetylcholinesterase activity in the hippocampus and posterior cortex, whereas in the prefrontal cortex, striatum and cerebellum the enzyme activity was not altered. In conclusion, in the present study we demonstrated that acute administration of fenproporex exerts an effect in the cholinergic system causing an increase in the activity of acetylcholinesterase in a dose-dependent manner in the hippocampus and posterior cortex. Thus, we suggest that the imbalance in cholinergic homeostasis could be considered as an important pathophysiological mechanism underlying the brain damage observed in patients who use amphetamines such as fenproporex.

Objective: In the present study, we aimed to examine the effects of repeated D-amphetamine (AMPH) exposure, a well-accepted animal model of acute mania in bipolar disorder (BD), and histone deacetylase (HDAC) inhibitors on locomotor behavior and HDAC activity in the prefrontal cortex (PFC) and peripheral blood mononuclear cells (PBMCs) of rats. Moreover, we aimed to assess brain-derived neurotrophic factor (BDNF) protein and mRNA levels in these samples. Methods: We treated adult male Wistar rats with 2 mg/kg AMPH or saline intraperitoneally for 14 days. Between the 8th and 14th days, rats also received 47.5 mg/kg lithium (Li), 200 mg/kg sodium valproate (VPT), 2 mg/kg sodium butyrate (SB), or saline. We evaluated locomotor activity in the open-field task and assessed HDAC activity in the PFC and PBMCs, and BDNF levels in the PFC and plasma. Results: AMPH significantly increased locomotor activity, which was reversed by all drugs. This hyperactivity was associated with increased HDAC activity in the PFC, which was partially reversed by Li, VPT, and SB. No differences were found in BDNF levels. Conclusion: Repeated AMPH administration increases HDAC activity in the PFC without altering BDNF levels. The partial reversal of HDAC increase by Li, VPT, and SB may account for their ability to reverse AMPH-induced hyperactivity.

Objective: To investigate the effects of cannabidiol (CBD) on mitochondrial complex and creatine kinase (CK) activity in the rat brain using spectrophotometry. Method: Male adult Wistar rats were given intraperitoneal injections of vehicle or CBD (15, 30, or 60 mg/kg) in an acute (single dose) or chronic (once daily for 14 consecutive days) regimen. The activities of mitochondrial complexes and CK were measured in the hippocampus, striatum, and prefrontal cortex. Results: Both acute and chronic injection of CBD increased the activity of the mitochondrial complexes (I, II, II-III, and IV) and CK in the rat brain. Conclusions: Considering that metabolism impairment is certainly involved in the pathophysiology of mood disorders, the modulation of energy metabolism (e.g., by increased mitochondrial complex and CK activity) by CBD could be an important mechanism implicated in the action of CBD.

Mood disorders are a leading cause of morbidity and mortality, yet their underlying pathophysiology remains unclear. Animal models serve as a powerful tool for investigating the neurobiological mechanisms underlying psychiatric disorders; however, no animal model developed to date can fully mimic the “corresponding” human psychiatric disorder. In this scenario, the development of different animal models contributes to our understanding of the neurobiology of these disorders and provides the possibility of preclinical pharmacologic screening. The present review seeks to provide a comprehensive overview of traditional and recent animal models, recapitulating different features and the possible pathologic mechanisms of mood disorders emulated by these models.

OBJETIVO: O presente estudo tem como objetivo investigar os efeitos da injeção intracerebroventricular de ouabaína sobre os níveis de BDNF na amígdala e no hipocampo de ratos Wistar. MÉTODOS: Os animais receberam uma única injeção intracerebroventricular de ouabaína (10-3 and 10-2 M) ou fluido cerebroespinhal artificial e, imediatamente, 3h, 24h ou sete dias após a injeção, os níveis de BDNF foram mensurados na amígdala e hipocampo dos ratos por ELISA sandwich (n = 8 animais por grupo). RESULTADOS: Quando avaliados imediatamente após a injeção, 3h ou 24h, ouabaína nas doses 10-2 e 10-3 M não alterou os níveis de BDNF em ambas as estruturas avaliadas. Entretanto, quando avaliados sete dias após a injeção, ouabaína nas doses 10-2 e 10-3 M mostrou uma significante redução nos níveis de BDNF em amígdala e hipocampo. CONCLUSÃO: Em conclusão, propõe-se que a administração de ouabaína diminuiu os níveis de BDNF em amígdala e hipocampo quando avaliados sete dias após a injeção, suportando a hipótese da participação da Na/K ATPase no transtorno bipolar.

OBJECTIVE: The present study aims to investigate the effects of ouabain intracerebroventricular injection on BDNF levels in the amygdala and hippocampus of Wistar rats. METHODS: Animals received a single intracerebroventricular injection of ouabain (10-3 and 10-2 M) or artificial cerebrospinal fluid and immediately, 1h, 24h, or seven days after injection, BDNF levels were measured in the rat's amygdala and hippocampus by sandwich-ELISA (n = 8 animals per group). RESULTS: When evaluated immediately, 3h, or 24h after injection, ouabain in doses of 10-2 and 10-3 M does not alter BDNF levels in the amygdala and hippocampus. However, when evaluated seven days after injection, ouabain in 10-2 and 10-3 M, showed a significant reduction in BDNF levels in both brain regions evaluated. DISCUSSION: In conclusion, we propose that the ouabain decreased BDNF levels in the hippocampus and amygdala when assessed seven days after administration, supporting the Na/K ATPase hypothesis for bipolar illness.

OBJETIVO: O transtorno do humor bipolar é uma doença psiquiátrica grave, recorrente e crônica associada a significativo prejuízo funcional, morbidade e mortalidade. A creatina quinase tem sido proposta como um marcador de dano cerebral. A creatina quinase é uma enzima importante principalmente para células que necessitam de uma grande quantidade de energia, como os neurônios. O objetivo do presente estudo foi comparar os níveis de creatina quinase entre as fases depressiva, maníaca e eutímica de pacientes com transtorno do humor bipolar. MÉTODO: Para avaliação dos níveis de creatina quinase no soro, 48 pacientes bipolares foram recrutados; 18 estavam eutímicos, 17 estavam em mania e 13 em episódio depressivo. Foi feita também uma comparação com um grupo controle que incluiu 41 voluntários saudáveis. Grupo eutimia: foram incluídos os pacientes que não cumpriam os critérios do DSM-IV para episódios de humor e deveriam ter a pontuação inferior a oito nas escalas de avaliação de mania (YMRS) e depressão (HDRS); grupo mania: foram incluídos os pacientes que apresentavam YMRS > 7 e HDRS < 7; grupo depressão: foram incluídos os pacientes que apresentavam HDRS > 7 e YMRS < 7. Os pacientes em episódios mistos não foram incluídos no estudo. Amostras de sangue foram coletadas de todos os participantes. RESULTADOS: Durante a mania, os níveis de creatina quinase foram aumentados em comparação com voluntários saudáveis. Entretanto, não houve diferença significativa nos níveis de creatina quinase em pacientes eutímicos e depressivos, quando comparados com o grupo controle. CONCLUSÃO: Nossos resultados sugerem que as fases maníaca, depressiva e eutímica do transtorno do humor bipolar, além de apresentarem sintomatologia distinta, também podem ser diferenciadas pelo nível de creatina quinase presente no sangue do paciente. Entretanto, mais estudos são necessários para entender as diferenças observadas na atividade da creatina quinase durante as fases do transtorno do humor bipolar.

OBJECTIVE: Bipolar disorder is a severe, recurrent, and often chronic psychiatric illness associated with significant functional impairment, morbidity, and mortality. Creatine kinase is an important enzyme, particularly for cells with high and fluctuating energy requirements, such as neurons, and is a potential marker of brain injury. The aim of the present study was to compare serum creatine kinase levels between bipolar disorder patients, in the various phases (depressive, manic, and euthymic), and healthy volunteers. METHOD: Forty-eight bipolar patients were recruited: 18 in the euthymic phase; 17 in the manic phase; and 13 in the depressive phase. The control group comprised 41 healthy volunteers. The phases of bipolar disorder were defined as follows: euthymic-not meeting the DSM-IV criteria for a mood episode and scoring < 8 on the Hamilton Depression Rating Scale (HDRS) and Young Mania Rating Scale (YMRS); manic-scoring < 7 on the HDRS and > 7 on the YMRS; depressive-scoring > 7 on the HDRS and < 7 on the YMRS. Patients in mixed phases were excluded. Blood samples were collected from all participants. RESULTS: Creatine kinase levels were higher in the manic patients than in the controls. However, we observed no significant difference between euthymic and depressive patients in terms of the creatine kinase level. CONCLUSION: Our results suggest that the clinical differences among the depressive, manic, and euthymic phases of bipolar disorder are paralleled by contrasting levels of creatine kinase. However, further studies are needed in order to understand the state-dependent differences observed in serum creatine kinase activity.