The post-partum period represents a time during which all maternal organisms undergo substantial plasticity in a wide variety of systems in order to ensure the well-being of the offspring. Although this time is generally associated with increased calmness and decreased stress responses, for a substantial subset of mothers, this period represents a time of particular risk for the onset of psychiatric disorders. Thus, post-partum anxiety, depression and, to a lesser extent, psychosis may develop, and not only affect the well-being of the mother but also place at risk the long-term health of the infant. Although the risk factors for these disorders, as well as normal peripartum-associated adaptations, are well known, the underlying aetiology of post-partum psychiatric disorders remains poorly understood. However, there have been a number of attempts to model these disorders in basic research, which aim to reveal their underlying mechanisms. In the following review, we first discuss known peripartum adaptations and then describe post-partum mood and anxiety disorders, including their risk factors, prevalence and symptoms. Thereafter, we discuss the animal models that have been designed in order to study them and what they have revealed about their aetiology to date. Overall, these studies show that it is feasible to study such complex disorders in animal models, but that more needs to be done in order to increase our knowledge of these severe and debilitating mood and anxiety disorders.
LINKED ARTICLESThis article is part of a themed section on Animal Models in Psychiatry Research. To view the other articles in this section visit http://dx.doi. org/10.1111/bph.2014.171.issue-20 Abbreviations BDNF, brain-derived neurotrophic factor; CORT, corticosterone; CRH, corticotrophin-releasing hormone; FSL, Flinders sensitive line; HAB, high anxiety-related behaviour; HPA axis, hypothalamus-pituitary-adrenal axis; HSP, hormone-simulated pregnancy; LAB, low anxiety-related behaviour; LH, learned helplessness; PPD, post-partum depression; PVN, paraventricular nucleus of the hypothalamus
IntroductionThe post-partum period represents a time of profound physiological and emotional changes in all maternal organisms in order to ensure the well-being and nurturance of the offspring. These alterations are wide ranging and include the onset of maternal behaviour, lactogenesis, as well as increased calmness and a reduced response to stress. However, in a large subset of mothers, this phase also represents a risk period for the development of several psychiatric disorders. Such postpartum mood and anxiety disorders are particularly damaging because they not only affect the well-being of the mother but also disadvantage the development of the infant as well, increasing their likelihood of developing a psychiatric disorder in later life (Weinstock, 2001;Newport et al., 2002; Davalos et al., 2012). Several post-partum disorders have been described and include post-partum depression (PPD), postpartum anxiety and post-partum psychosis. A n...