No abstract

A Escala Multidimensional de Suporte Social Percebido (MSPSS), originalmente desenvolvida por Zimet, Dahlem, Zimet, e Farley (1988), foi criada para avaliar subjectivamente o suporte social proveniente da família, dos amigos e de outros significativos. Neste trabalho apresentam-se as características psicométricas da versão portuguesa da MSPSS. A escala foi avaliada num grupo de estudantes (n = 454), num grupo da população geral (n = 261) e num grupo de doentes com depressão major (n = 100). A análise factorial demonstrou a existência de três factores (Família, Amigos e Outros Significativos). Igualmente apresentou uma boa consistência interna, entre .85 e .95, considerando os três factores, os três grupos e ambos os géneros; apresentou uma adequada validade de construto e a estabilidade teste-reteste no grupo de estudantes e população geral apresentou valores entre .40 e .91. Os alfas de Cronbach no reteste oscilaram entre .87 e .95. A presente versão da MSPSS mostrou ter qualidades psicométricas adequadas para ser utilizada em estudantes, em sujeitos da população geral bem como em populações com psicopatologia depressiva, sendo necessária agora a continuação da investigação em outras amostras e utilizando estudos de seguimento.

The social rank and arrested defenses model for mood disorders bridges between animal and human models of psychopathology. There is increasing evidence that depression is associated with subordinated and loss of social rank, feeling inferior, shame, submissive behavior, and feeling defeated. These stressful states activate threat coping responses of fight and flight. If these are aroused but blocked, feelings of entrapment emerge with a negative impact on mood. The current study builds on previous studies and explores the association between depressive symptoms, social rank variables (of social comparison and submissive behavior), entrapment, and defeat in a sample of patients (n = 106) with major depression and in a sample of healthy controls (n = 116). Results showed that social rank variables, entrapment, and defeat were strongly associated with depressive symptoms in both samples. Entrapment and defeat showed significant association with other social rank variables. Logistic regression analysis revealed that defeat and internal entrapment were significant predictors of the belonging to the clinical or control groups. The present study extends previous research and supports the importance of defeat and external entrapment in clinical depression.

Depression is a prevalent psychiatric disorder with an increasing impact in global public health. However, a large proportion of patients treated with currently available antidepressant drugs fail to achieve remission. Recently, antipsychotic drugs have received approval for the treatment of antidepressant-resistant forms of major depression. The modulation of adult neuroplasticity, namely hippocampal neurogenesis and neuronal remodeling, has been considered to have a key role in the therapeutic effects of antidepressants. However, the impact of antipsychotic drugs on these neuroplastic mechanisms remains largely unexplored. In this study, an unpredictable chronic mild stress protocol was used to induce a depressive-like phenotype in rats. In the last 3 weeks of stress exposure, animals were treated with two different antipsychotics: haloperidol (a classical antipsychotic) and clozapine (an atypical antipsychotic). We demonstrated that clozapine improved both measures of depressive-like behavior (behavior despair and anhedonia), whereas haloperidol aggravated learned helplessness in the forced-swimming test and behavior flexibility in a cognitive task. Importantly, an upregulation of adult neurogenesis and neuronal survival was observed in animals treated with clozapine, whereas haloperidol promoted a downregulation of these processes. Furthermore, clozapine was able to re-establish the stress-induced impairments in neuronal structure and gene expression in the hippocampus and prefrontal cortex. These results demonstrate the modulation of adult neuroplasticity by antipsychotics in an animal model of depression, revealing that the atypical antipsychotic drug clozapine reverts the behavioral effects of chronic stress by improving adult neurogenesis, cell survival and neuronal reorganization.