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Commentary

The Pervasive and Persistent Neurobiological and Clinical Aftermath of Child Abuse and Neglect

See Commentary by Etain, et al.

The Pervasive and Persistent Neurobiological and Clinical Aftermath of Child Abuse and Neglect

In the last 2 decades, there has been a veritable explosion of studies concerning the clinical and neurobiological consequences of early life trauma. Once an area relegated to esoteric debates on whether Freud’s patients’ accounts of early trauma were "real" or "fantasies," largely appearing in the psychoanalytic literature and commentaries related to Freud’s vacillation on this subject,1 child abuse and neglect are now clearly established as major risk factors for mood, anxiety, and psychotic disorders, as well as several medical disorders.2,3 Indeed, with the exception of genetic (and perhaps epigenetic) mechanisms, child abuse and neglect, undoubtedly, are among the most significant contributors to vulnerability for the development of major psychiatric syndromes.

In this issue of JCP, Etain and colleagues4 provide a seminal study on the relationship of childhood trauma to disease severity in a large cohort (almost 600) of Norwegian and French bipolar disorder patients. In brief, using one of the best validated measures of early adversity, the Childhood Trauma Questionnaire, they observed very significant effects—ie, a clear "dose-response" relationship—of childhood sexual and emotional abuse and emotional neglect on the severity and course of bipolar disorder, namely, earlier age at onset, increased suicide attempts, more rapid cycling, and an increased number of depressive episodes. For example, both emotional and sexual abuse independently predicted lower age at onset and higher number of suicide attempts, with sexual abuse a strong predictor of rapid cycling. Patients with child abuse histories developed bipolar disorders more than 4 years earlier than patients with no such histories. A similar dose-response relationship was observed between child abuse severity and number of suicide attempts. However, there was no statistically significant dose-response relationship between genders.

These findings add to the burgeoning evidence supporting a preeminent role of child abuse and neglect in the pathogenesis of serious and severe psychiatric disorders including major depression, schizophrenia, and posttraumatic stress disorder (PTSD).

In the past decade, considerable progress has been made by our group and others in elucidating the neurobiological mechanisms mediating the increased risk of mood and anxiety disorders in individuals exposed to child abuse and neglect. Space constraints preclude a comprehensive discussion, and reviews are available.5,6 Here, we will summarize clinical studies that have sought to elucidate the biological mechanisms by which early life trauma produces these long-lasting effects on psychiatric disease morbidity. The major areas to be discussed include genetics and epigenetics, neuroendocrine systems, and inflammation, as well as structural and functional brain imaging. It is important to note that in addition to increasing risk for major psychiatric disorders, child abuse and neglect, not surprisingly, also affect treatment response. For example, in a recent meta-analysis, Nanni et al7 reported that depressed patients with a history of child abuse or neglect exhibited a significantly reduced response to both antidepressants and psychotherapy.

The pioneering study by Caspi and colleagues8 documented the importance of a polymorphism in the promotor region of the serotonin transporter in mediating the depressogenic effects of child abuse and neglect in the well-studied Dunedin cohort. This finding has been replicated by most (including our group9), but not all,10 investigators. A multitude of studies have now documented the importance of polymorphisms of several candidate genes in mediating the depressogenic, suicidogenic, and/or anxiogenic effects of child abuse and neglect. These include studies of the corticotropin-releasing factor (CRF) type 1 receptor (CRFR1),11 CRF binding protein (CRFBP),12 brain-derived neurotrophic factor (BDNF),13 5-HT3 receptor (HTR3A),14 and FKBP5,15 which codes for a co-chaperone protein that mediates the effects of cortisol on the glucocorticoid receptor. Single-nucleotide polymorphisms (SNPs) of each of these genes have been demonstrated in multiple studies in relatively large populations to exert significant effects in mediating the deleterious effects of early adversity. Although it has not yet been demonstrated, we would suggest that individuals with multiple vulnerability SNPs are unusually sensitive to the depressogenic and anxiogenic effects of early life trauma and that, conversely, those with few or none of these SNPs are quite likely resilient in the face of such adversity. We predict a time in the not-distant future in which personalized medicine will be realized in this domain—physicians and mental health professionals will have access to individuals’ genome scans, a component of their permanent electronic medical record, and, with the advances described above, will be able to predict relative risk for mood and anxiety disorders based on the number of vulnerability and resilience SNPs present. If parents were informed immediately after a child’s birth that the child would very likely be unduly sensitive to the effects of emotional or physical abuse or neglect, they could, for example, take precautions against bullying and be more mindful of the child’s environment.

A major recent advance in the field has been epigenetics—the realization that heritable changes in gene expression associated with transcriptional modifications by methylation and demethylation occur in response to environmental changes and, in particular, to early adversity. The epigenetic changes seen in these preclinical and clinical studies pioneered by Michael Meaney and his colleagues have, for example, been shown to be associated with the increase in suicide in victims of child abuse, as demonstrated in postmortem brain studies.16 Recently, our group demonstrated that a SNP in the FKBP5 gene that mediates the child abuse-associated increase in PTSD is actually mechanistically regulated by just this type of demethylation.17 Our study is the first direct demonstration in psychiatry of a SNP-epigenetics interaction with important clinical and therapeutic implications.

Other biological consequences of early trauma have been implicated in mediating the increased vulnerability of these individuals for mood and anxiety disorders. Long-lasting dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis has received considerable attention, although there is no universal agreement as to the precise nature of the HPA axis alterations.18,19 There is much evidence for hyperactivity of hypothalamic and extrahypothalamic circuits containing CRF after early life adversity in rodent, nonhuman primate, and clinical studies.20-23 Consequent alterations in circulating adrenocorticotropic hormone and glucocorticoid concentrations have also been noted. This finding may be particularly relevant to the mixed bipolar patient with early life trauma because of the profound HPA-axis hyperactivity reported in this subpopulation.24

Inflammation is now known to play a preeminent role in the pathogenesis of a variety of major medical disorders including cardiovascular disease, cancer, and diabetes, and there is now evidence that it also is involved in depression, bipolar disorder, and schizophrenia. Thus, multiple studies have revealed increased inflammatory markers including C-reactive protein and interleukin-6, as well as tumor necrosis factor, in patients with depression.25 Danese and colleagues26 have provided groundbreaking studies unequivocally demonstrating persistent increases in inflammatory markers in adults exposed to child abuse and neglect, and these findings have been replicated by our group.27

Finally, the long-term neurobiological consequences of child abuse and neglect in the central nervous system have been demonstrated directly by structural and functional brain imaging studies. This area is burgeoning and can be only briefly discussed. However, it is important to note that the myriad of studies that have reported structural and functional alterations in patients with major psychiatric disorders over the last 4 decades were largely conducted without the knowledge that early life trauma could and does exert profound effects on such measures. It is impossible to determine from those early studies of patients with bipolar disorder, depression, and schizophrenia what role early life trauma played in the results obtained. What is clear is that child abuse and neglect result in structural alterations in the hippocampus, amygdala, and several cerebrocortical areas, and, moreover, the effects are in part specific to the nature of the early abuse. Thus, we recently documented reduced cortical thickness in the somatosensory cortical area for genital sensation in women with childhood sexual abuse, a finding that is congruent with their often-repeated observations of diminished libido and anorgasmia.28 Emotional abuse was associated with structural alterations in emotional processing areas such as the anterior cingulate.28 Functional imaging studies, largely using functional magnetic resonance imaging, by our group29 and others30 have revealed alterations in brain areas that mediate emotional processing to provocative stimuli. Long-lasting changes in cognitive function, including executive function, are also seen in adults victimized during childhood.31 Coming full circle, the report by Etain et al4 demonstrating the profound negative consequences of child abuse and neglect on the course of bipolar disorder is of considerable importance because it not only contributes to the burgeoning database on the profound impact of child abuse and neglect on adult health but also raises a fundamentally important question: Do patients with early life trauma and mood disorders represent a unique endophenotype that requires, for optimal outcome, a unique treatment approach? As we uncover the precise neurobiological consequences of child abuse and neglect, rational and novel treatment strategies can be developed.

Author affiliations: Department of Psychiatry and Behavioral Sciences, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida.

Potential conflicts of interest: Dr Nemeroff has received research support/grants from National Institutes of Health and Agency for Healthcare Research and Quality; has consulted for Xhale, Takeda, SK Pharma, Shire, Roche, Eli Lilly, Allergan, and Mitsubishi Tanabe; is a stockholder in CeNeRx BioPharma, PharmaNeuroBoost, Revaax, and Xhale; has other financial interests in CeNeRx BioPharma and PharmaNeuroBoost; has patents for a method and devices for transdermal delivery of lithium (US 6,375,990B1) and a method of assessing antidepressant drug therapy via transport inhibition of monoamine neurotransmitters by ex vivo assay (US 7,148,027B2); is on scientific advisory boards of American Foundation for Suicide Prevention (AFSP), CeNeRx BioPharma (2012), National Alliance for Research on Schizophrenia and Depression, Xhale, PharmaNeuroBoost (2012), Anxiety Disorders Association of America (ADAA), Skyland Trail, and AstraZeneca (2009); is on the boards of directors of AFSP, Mt Cook Pharma (2010), NovaDel (2011), Skyland Trail, Gratitude America, and ADAA; has income sources of or equity of $10,000 or more in AstraZeneca, PharmaNeuroBoost, CeNeRx BioPharma, NovaDel, Reevax, American Psychiatric Publishing, and Xhale; and has received honoraria and royalties from and served as an expert witness for various companies and organizations. Dr Seligman reports no potential conflict of interest.

Funding/support: None reported.

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Submitted: June 10, 2013; accepted June 10, 2013.

Corresponding author: Charles B. Nemeroff, MD, PhD, Department of Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, 1120 Northwest 14 St, Ste 1455, Miami, FL 33136 (cnemeroff@med.miami.edu).

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