title: Cortisol reactivity and suicidal behavior: Investigating the role of hypothalamic-pituitary-adrenal axis responses to stress in suicide attempters and ideators.
abstract: Every 40s a person dies by suicide somewhere in the world. The causes of suicidal behavior are not fully understood. Dysregulated hypothalamic-pituitary-adrenal (HPA) axis activity, as measured by cortisol levels, is one potential risk factor. The current study aimed to investigate whether cortisol reactivity to a laboratory stress task differentiated individuals who had previously made a suicide attempt from those who had thought about suicide (suicide ideators) and control participants. One hundred and sixty participants were recruited to a previous attempt, a suicidal ideation or a control group. Participants completed background questionnaires before completing the Maastricht Acute Stress Test (MAST). Cortisol levels were assessed throughout the stress task. Measures of suicide behavior were measured at baseline, 1 month and 6 month follow-up. Participants who had made a previous suicide attempt exhibited significantly lower aggregate cortisol levels during the MAST compared to participants in the control group; suicide ideators were intermediate to both groups. This effect, however, was driven by participants who made an attempt within the past year, and to some degree by those with a family history of attempt. Participants who made a suicide attempt and had a family history of suicide exhibited the lowest levels of cortisol in response to stress. Finally, lower levels of cortisol in response to the MAST were associated with higher levels of suicidal ideation at 1-month follow-up in the suicide attempter group. These results are consistent with other findings indicating that blunted HPA axis activity is associated with some forms of suicidal behavior. The challenge for researchers is to elucidate the precise causal mechanisms linking stress, cortisol and suicide risk.
authors.affiliation: School of Psychology, University of Leeds, Leeds UK. Electronic address: d.b.oconnor@leeds.ac.uk.
authors.forename: Daryl B
authors.initials: DB
authors.lastname: O'Connor
authors.affiliation: School of Psychology, University of Leeds, Leeds UK.
authors.forename: Jessica A
authors.initials: JA
authors.lastname: Green
authors.affiliation: School of Psychology, University of Nottingham, Nottingham, UK.
authors.forename: Eamonn
authors.initials: E
authors.lastname: Ferguson
authors.affiliation: Division of Psychology, University of Stirling, Stirling, UK.
authors.forename: Ronan E
authors.initials: RE
authors.lastname: O'Carroll
authors.affiliation: Suicidal Behavior Research Laboratory, Institute of Health & Wellbeing, University of Glasgow, Glasgow, UK.
authors.forename: Rory C
authors.initials: RC
authors.lastname: O'Connor
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000378:metabolism*; D007030:Hypothalamo-Hypophyseal System / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D010913:Pituitary-Adrenal System / Q000378:metabolism*; D013315:Stress, Psychological / Q000378:metabolism*; D059020:Suicidal Ideation; D013406:Suicide, Attempted; D055815:Young Adult
chemical_list: D006854:Hydrocortisone
keywords: Allostatic load; Chronic stress; Cortisol reactivity; HPA axis; Self-harm