Prenatal stress and its effects on the fetus and the child: possible underlying biological mechanisms

Can prenatal maternal stress increase the risk of asthma?

Maternal stress adversely affects a mother's well-being and health and also negatively impacts her offspring. That this relationship also holds true for maternal stress during the pregnancy period is intuitive. However, whether maternal stress increases the risk of asthma development in her offspring is less clear and will be evaluated in this review. There is evidence from murine models to suggest that maternal stress during pregnancy increases the risk of asthma in the offspring. While recent experimental research adds to the increasing body of evidence supporting a causal relationship between prenatal maternal stress and asthma risk in the offspring, the epidemiological evidence supporting this notion is insufficient. Almost all existing observational studies suffer from severe methodological limitations. Nevertheless, the results from experimental work on maternal stress during pregnancy and asthma risk in the offspring, in concert with other obvious adverse health effects in the offspring are sufficient to justify a recommendation to reduce maternal stressors, particularly during pregnancy.

Effects of prenatal factors and temperament on infant cortisol regulation in low-income Mexican American families

Prenatal psychosocial exposures can significantly affect infant health and development. Infants with higher temperamental negativity are theorized to be more susceptible to environmental exposures. We evaluated the interaction of prenatal maternal exposures and infant temperamental negativity to predict infant cortisol response to mildly challenging mother-infant interaction tasks. Participants included 322 Mexican American mother-infant dyads (mother age 18-42; 82% Spanish-speaking; modal family income $10,000-$15,000). Mothers reported depressive symptoms and social support prenatally and infant temperamental negativity at 6 weeks postpartum. Salivary cortisol was collected from infants before and after mother-infant interaction tasks at 12 weeks. Higher prenatal maternal depressive symptoms and lower social support predicted higher cortisol among infants with higher temperamental negativity. Higher infant temperamental negativity predicted an increase in maternal distress and a decrease in social support from prenatal to 12 weeks postpartum. Interactive influences of maternal social-contextual factors and infant temperament may influence the development of infant neurobiological regulation and promote or strain maternal and infant adaptation over time.

A Review of the Effects of Anxiety During Pregnancy on Children's Health

Background:

Although pregnancy is often portrayed as a time of great joy, that’s not the reality for all women. The adverse, long-term, stable, and sometimes, irreparable effects of anxiety during pregnancy can change pregnancy into an agonizing and unpleasant event of women’s life span.

Aim:

The aim of this study was to explore the adverse effects of anxiety in pregnancy on children’s health in order to promote child health.

Methods:

In this narrative review the researchers searched in public databases like Google Scholar general search engine, and then more specific: Science Direct, Scientific Information Database, Magiran, Irandoc, Pubmed, Scopus, Cochrane library, and Psych info using Medical Subject Headings (MeSH) keywords: anxiety, maternal anxiety, pregnancy, pregnancy outcome, control and prevention restricted to English / Persian language, during the 20 years ago. Then those articles written by renowned experts were selected. At first, a list of 60 papers generated from the initial search. Then reviewers studied titles and abstracts and finally, quality assessment of full text studies was performed by two independent reviewers. Researchers reviewed summary of all articles sought, ultimately used data from 25 full articles to compile this review paper.

Results:

The findings were classified into four groups Biological, Mental, Behavioral, and Medical effects of anxiety during pregnancy.

Conclusions:

The effects of anxiety during pregnancy on offspring’s health are serious and thought-provoking to which the need for identifying and screening of anxiety disorders in prenatal care is necessary.

Programming the brain and behaviour by early-life stress: a focus on neuroactive steroids

Animal studies have amply demonstrated that stress exposure during pregnancy or in early postnatal life can adversely influence brain development and have long-term 'programming' effects on future brain function and behaviour. Furthermore, a growing body of evidence from human studies supports the hypothesis that some psychiatric disorders may have developmental origins. Here, the focus is on three adverse consequences of early-life stress: dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis, heightened anxiety behaviour and cognitive impairments, with review of what is known about the underlying central mechanisms. Neuroactive steroids modulate neuronal activity and play a key role in neurodevelopment. Moreover they can negatively modulate activity of the HPA axis, exert anxiolytic actions and influence cognitive performance. Thus, neuroactive steroids may provide a link between early-life stress and the resultant adverse effects on the brain and behaviour. Here, a role for neuroactive steroids, in particular the 5α-reduced/3α-hydroxylated metabolites of progesterone, testosterone and deoxycorticosterone, is discussed in the context of early-life stress. Furthermore, the impact of early-life stress on the brain's capacity to generate neurosteroids is considered and the evidence for an ability of neuroactive steroids to over-write the negative effects of early-life stress on the brain and behaviour is examined. An enhanced understanding of the influence of early-life stress on brain neurosteroid systems could aid the identification of new targets for developing treatments for stress-related conditions in humans.