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The American Journal of Psychiatry, VOL. 164, No. 4
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Article   |   April 01, 2007 
Increased Waking Salivary Cortisol Levels in Young People at Familial Risk of Depression
Zola N. Mannie; Catherine J. Harmer; Philip J. Cowen
Am J Psychiatry 2007;164:617-621. 10.1176/appi.ajp.164.4.617
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Abstract
Objective: Cortisol hypersecretion is one of the most reliable biological abnormalities in major depression, but it is uncertain if it represents an illness marker or a trait vulnerability to mood disorder. The present study sought to answer this question by measuring waking salivary cortisol levels in young people at familial risk of depression but with no personal history of mood disorder. Method: The authors studied 49 young people who had not been depressed themselves but who had a parent with a history of major depression (FH+) and a comparison group of 55 participants who had no personal history of depression and no reported depression in a first-degree relative. The authors measured the amount of cortisol secreted in saliva during the first 30 minutes after awakening on a workday and on a nonworkday. Results: The amount of cortisol secreted by the FH+ subjects was greater than that of the comparison subjects on both workdays (mean=698 nmol×minutes/liter, SD=243, versus mean=550, SD=225) and nonworkdays (mean=633 nmol×minutes/liter, SD=216, versus mean=492, SD=166). The increase in cortisol secretion was not accounted for by differences in parental attachment, life events, personality, or current mental state. Conclusions: Hypersecretion of cortisol can be detected in asymptomatic individuals at genetic risk of depression and may represent an illness endophenotype. Further studies will be needed to find out if increased waking salivary cortisol levels can predict individual risk of illness and whether the increased cortisol secretion has implications for general health and cognitive function. Abstract Teaser
Figures in this Article

    One of the more consistent physiological abnormalities reported in clinical depression is the hypersecretion of cortisol (1, 2). Generally, cortisol hypersecretion is regarded as a state marker of depression that remits with clinical improvement. However, some studies have suggested that subtle abnormalities in the hypothalmic-pituitary-adrenal (HPA) axis persist in patients at high risk of relapse (3). One convenient noninvasive measure of HPA axis activity is the increase in salivary cortisol that follows awakening (4). With this approach, we found that the morning increase in salivary cortisol was elevated not only in acutely depressed patients but also in recovered depressed patients who had been withdrawn from medication (5, 6).
    The latter finding is of interest because it suggests that cortisol hypersecretion may persist during clinical remission and could represent a risk factor for further episodes of illness. However, it is unclear whether the increase in waking cortisol seen in recovered depressed patients might predate the onset of the depressive condition or could instead represent some kind of illness "scar," that is, a consequence of repeated episodes of illness and their treatment (7). To resolve this issue, it is necessary to study people who are at risk of depression but who have not suffered clinical illness. Numerous risk factors for depression have been described, but one of the most reliable is family inheritance (8). It has been estimated that by young adulthood up to 40% of children of parents with a clinical mood disorder will have suffered a personal episode of depression (9, 10). The aim of the present study was to study waking salivary cortisol levels in young people who had a parent affected by depression but no personal history of depression themselves. We predicted that the waking salivary cortisol levels of these subjects would be greater than those of comparison subjects with no personal or family history of depression.
    +

    Subjects

    We recruited 58 young people (41 women and 17 men) (age: mean=19.1 years, range=17—21) who had never personally suffered from depression but who had a biological parent with a history of major depression (FH+). The subjects were recruited by advertisement through the University of Oxford, U.K., Brookes University, and other local colleges. Potential participants were assessed with the Structured Clinical Interview for DSM-IV Axis I Disorders Schedule Clinician Version (SCID-I) (11) to exclude a personal current or previous history of major depression. The presence of major depression in a parent was assessed with the family history method by using the participant as an informant (12). The criteria included description of the symptoms of major depression together with the prescription of specific antidepressant treatment, either psychotherapy or medication. Where the history was not clear, permission was sought from the participants for the researcher to seek clarification directly from the parent. A history of bipolar disorder in a parent was an exclusion criterion.
    We also recruited 62 comparison subjects (44 women and 18 men) (age: mean=18.8 years, range=16—20) who were determined by the same instruments to have no current or past history of major depression and no history of depression in a biological parent or other first-degree relative. All subjects gave full informed consent to participate in the study, which was approved by the local ethics committee. Each subject was paid £40 for participation.
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    Psychosocial Measures

    Both subject groups were assessed on a number of psychosocial measures that have previously been reported to be risk factors for major depression (13). The experience of parenting was assessed with the Parental Bonding Instrument, which rates parental care and overprotection (14). Both lack of care and overprotection have been associated with an increased risk of depression (14, 15). Lifetime and recent adverse life events are also linked with the development of depression (16). We measured life events with the Life Events Rating Scale, which assesses threat and loss events in the past year and over the lifespan (17). Aspects of temperament and cognitive style, for example, neuroticism and ruminative thinking, are also believed to increase the risk of depression (13, 18). We measured neuroticism with the Eysenck Personality Inventory and ruminative thinking with the Ruminative Responses Scale, a subscale of the Response Styles Questionnaire (19, 20).
    We also measured a number of items assessing current emotional state because subclinical symptoms of anxiety and depression can be a risk factor for major depression and because waking salivary cortisol is sensitive to current emotional state (21, 22). We measured mood and anxiety with two self-rating instruments, the Mood and Feelings Questionnaire and the Hospital Anxiety and Depression Scale (23, 24). The Perceived Stress Scale was used to measure subjective stress over the past month (25).
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    Salivary Cortisol Sampling

    We measured waking salivary cortisol levels on two separate mornings. One of the sampling mornings took place on a day when the participants had scheduled activities such as work or study ("workday"). The other sampling morning occurred on a day without such commitments ("nonworkday"). The participants were carefully instructed to take the first saliva sample as soon as they awoke and to take two further samples at 15-minute intervals. During the sampling, the subjects remained resting in bed and did not eat or drink. Saliva samples were collected by using a salivette device (Sarstedt, Leicester, U.K.) in which saliva is absorbed into a cotton roll and then expressed into a sterile vial. Salivary cortisol was measured, blind to subject status, by an in-house double-antibody immunoassay with intra- and interassay coefficients of variation of 3% and 10%, respectively.
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    Statistical Analysis

    Cortisol data distribution did not differ significantly from normal (Kolmogorov-Smirnov test) and were analyzed with a two-way repeated-measures analysis of variance (ANOVA) with the day of the testing ("workday versus nonworkday") and time of sampling ("time") as the main within-subjects factors. Group (FH+ versus comparison) was a between-subjects factor. Neither age nor gender were significant covariates and were both dropped from the analysis. Salivary cortisol level was also measured as an area under the curve with the trapezoid measure. Other variables were analyzed with Student’s t tests (two-tailed) or the chi-square test. Correlations were carried out with Pearson’s product-moment correlation.
    Assayable cortisol samples for both occasions were returned by 49 FH+ subjects and 53 comparison subjects. The salivary cortisol levels of one comparison subject were grossly elevated (>100 nmol/liter) and were dropped from the analysis. Therefore, all subsequent analyses were carried out on 49 FH+ subjects (36 women and 13 men) and 52 comparison subjects (38 women and 18 men). The age of the FH+ subjects (mean=19.1 years, SD=0.9) was about 6 months greater than that of the comparison subjects (mean=18.7 years, SD=1.0), a difference of borderline statistical significance (t=1.98, df=99, p=0.05). The gender ratio of the groups did not differ (χ2=0.78, df=1, p=0.38).
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    Waking Salivary Cortisol Levels

    The ANOVA of the salivary cortisol data showed main effects of test day (F=10.13, df=1, 99, p=0.002), time (F=137.20, df=2, 99, p<0.001), and group (F=15.46, df=1, 99, p<0.001). There was a significant interaction between test day and time (F=4.10, df=2, 99, p<0.02), but no other significant interactions were apparent. Salivary cortisol levels rose from the point of awakening, were higher on workdays than nonworkdays, and were higher in FH+ subjects than comparison subjects at each time point (Figure 1).
    Significant increases in cortisol secretion of over 25% were also seen in FH+ participants when cortisol was measured as the area under the curve (workday: mean=698 nmol×minutes/liter, SD=243, versus mean=550, SD=225) (t=3.18, df=99, p=0.002) (nonworkday: mean=633, SD=216, versus mean=492, SD=166) (t=3.67, df=99, p<0.001). When we considered both groups together, the area under the curve of cortisol secretion on workdays was about 10% greater than on nonworkdays (mean=622 nmol×minutes/liter, SD=244, versus mean=561, SD=204) (t=2.97, df=100, p=0.004, paired t test). The time of awakening did not differ between the groups on either the nonworkday (FH+: mean=0846 hours, SD=1.2, versus comparison subjects: mean=0844, SD=1.2) (t=0.17, df=99, p=0.87) or the workday (FH+: mean=0749, SD=1.2, versus mean=0745, SD=1.0) (t=0.32, df=99, p=0.75).
    We examined whether the cortisol area-under-the-curve in the FH+ participants was influenced by the gender of the depressed parent. For this purpose, we took the area under the curve cortisol response of each subject averaged over the two test days. Of the FH+ subjects, 33 identified depression in their mothers and 13 in their fathers (in three subjects, both the mother and the father were reported as depressed). The cortisol area under the curve in participants whose mothers had been depressed (mean=660 nmol×minutes/liter, SD=201) did not differ from those for whom fathers were depressed (mean=671, SD=219) (t=0.15, df=44, p=0.88). Both groups had significantly higher mean cortisol areas under the curve than the comparison subjects (mothers depressed: t=3.38, df=83, p=0.001; fathers depressed: t=2.65, df=63, p=0.01).
    +

    Psychosocial Data

    Scores for depressive symptoms, neuroticism, and perceived stress were very similar in the two subject groups (Table 1). Adverse life events in the past year did not distinguish the two groups, but the FH+ subjects had a small excess of lifetime life events. Although the two groups did not differ on the father-related scores of the Parental Bonding Instrument, the comparison subjects rated their mothers as being more overprotective (Table 1).
    +

    Correlations

    For correlation analyses, the cortisol data for each subject were measured as the average area under the curve of the two test occasions. With this measure, there were no significant correlations between mean cortisol areas under the curve and any of the psychosocial variables shown in Table 1, either in the FH+ subjects considered alone or in both subject groups together. In addition, there was no correlation of area-under-the-curve cortisol secretion with age or time of awakening. Some expected correlations were seen in the psychosocial data. For example, perceived stress in the past month correlated positively with the Mood and Feelings Questionnaire score (r=0.693, p<0.001), the past year’s life events (r=0.280, p=0.005), and neuroticism (r=0.590, p<0.001) and negatively with the Parental Bonding Instrument maternal care score (r=—0.33, p=0.001).
    Our findings suggest that young people at risk of depression through a positive family history have increased waking salivary cortisol levels. This increase in cortisol secretion does not appear to be explained by differences in current mental state because both FH+ subjects and comparison subjects scored very similarly on ratings of mood symptoms and perceived stress.
    The increase in salivary cortisol level that follows awakening is believed to represent activation of the HPA axis (26). The awakening cortisol response has good intrasubject reliability, although it is modified by factors such as current perceived stress (27). High levels of neuroticism are associated with increased waking salivary cortisol levels, but it is difficult to distinguish the effect of trait neuroticism on cortisol secretion from the elevated levels of anxiety and depression typical of people who score highly on neuroticism scales (28). It has been reported previously that waking salivary cortisol is increased on workdays relative to nonworkdays, and our data support this (29). However, the effect of family history on waking salivary cortisol was apparent on both test days and seemed independent of the workday/nonworkday difference. We did not control for menstrual cycle status because a previous study showed no difference in waking salivary cortisol levels between the follicular and luteal phases of the cycle (30). In addition, the ANOVA showed no main or interactive effects of gender on waking cortisol secretion. However, in general it is advisable to control for menstrual cycle effects in neuroendocrine studies; such control might have improved the precision of our results.
    What underlying mechanisms might account for the increased waking salivary cortisol level in FH+ participants? As noted above, current mental state, perceived stress, and neuroticism do not apparently play a role in this particular group of subjects. Both animal experimental and human studies indicate that childhood adversity can produce long-term modifications in the regulation of the HPA axis (31, 32). For example, infants whose mothers had experienced postnatal depression had higher morning salivary cortisol levels as teenagers, perhaps mediated by early attachment difficulties (33). However, judged by the Parental Bonding Instrument, the FH+ and comparison groups did not seem to differ substantially in their perception of childhood care, and in fact, the comparison subjects reported more maternal overprotection, although this did not correlate with cortisol secretion. Similarly, although the FH+ subjects reported a small excess of lifetime adverse events, this did not apparently account for their greater cortisol secretion. However, our life events interview did not probe specifically for childhood sexual abuse, which has been linked to the development of abnormal HPA axis function in adulthood (32).
    It seems likely that part of the increased risk for depression in children with a depressed parent is transmitted by genetic factors (8), and there is good evidence that genetic influences are involved in various aspects of HPA axis regulation, including waking salivary cortisol levels (27, 34, 35). Therefore, it seems likely that genetic differences play a part in the increased salivary cortisol secretion we observed in FH+ subjects. The increase in salivary cortisol level that follows awakening is believed to be caused by enhanced release of adrenocorticotropic hormone (ACTH) from the pituitary gland (26), and there are several points in the HPA axis at which genetic variation could alter this process (35). For example, hypersecretion of cortisol in depressed patients has been attributed in part to deficient feedback by glucocorticoid receptors, leading to HPA axis disinhibition (1, 2, 36). Glucocorticoid receptors have a number of polymorphic variants, some of which may influence cortisol secretion (37) and could therefore be implicated in the increased waking salivary cortisol seen in FH+ subjects.
    In the present group of FH+ subjects, increased cortisol secretion was not associated with clinical symptoms. However, an elevated waking cortisol level might be part of an endophenotype predisposing a subject to the development of depression in the context of life events and difficulties. Prospective studies will be required to test this proposal. If this is the case, waking salivary cortisol levels might provide a useful surrogate marker on which to test psychological or nutritional strategies designed to lower the incidence of depression in those at risk.
    It is also possible that FH+ subjects could experience medical consequences of persistent cortisol hypersecretion, including, for example, increased risks of obesity and cardiovascular disease, illnesses that are known to be associated with recurrent depression (38). There is also much current interest in the deleterious effects of elevated cortisol secretion on synaptic plasticity and neurogenesis in the brain (39). For example, it has been proposed that cognitive impairments seen in depressed patients might be secondary to chronic cortisol hypersecretion affecting the cellular integrity of the hippocampus (40). Whether in at-risk individuals hypersecretion of cortisol in the absence of clinical depression might also result in cognitive impairment will need to be assessed in specific neuropsychological studies, perhaps in conjunction with structural imaging of the hippocampus.
    A number of limitations of our study must be acknowledged. We did not systematically conduct personal psychiatric interviews with relatives for either FH+ or comparison groups; therefore, it is possible that some of the parents in the FH+ group did not suffer from depression or that some parents in the comparison group did. Presumably, however, misclassifications of this kind would tend to decrease rather than increase differences in cortisol secretion between the two groups. Also, although an increased waking salivary cortisol level might be a useful marker of vulnerability to depression, it is not clear how far an increase in cortisol secretion at one point in the day can be regarded as clinically significant, with potential pathological consequences. It is also worth noting that altered secretion of the adrenal steroid dehydroepiandrosterone (DHEA) may be a risk factor for depression in young people (41) and that the ratio of salivary cortisol to DHEA might provide a more sensitive measure of "functional" hypercortisolemia than a measurement of cortisol alone (42). Further studies will be needed to assess how far increased waking cortisol secretion is a personal risk factor for subsequent depression and whether it has consequences for health and cognitive performance in the absence of depressive symptoms.
    Received March 16, 2006; revision received May 4, 2006; accepted May 31, 2006. From the Department of Psychiatry, Warneford Hospital, and the Department of Experimental Psychology, University of Oxford. Address correspondence and reprint requests to Dr. Cowen, Department of Psychiatry, Warneford Hospital, University of Oxford, Oxford OX3 7JX, UK; phil.cowen@psych.ox.ac.uk (e-mail).
    All authors report no competing interests.
    Supported by an MRC program grant to Dr. Cowen.
    The authors thank Alison Reed for performance of the cortisol assays.
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    Figure 1. Salivary Cortisol Levels in Subjects Without Depression But With a Parent With a History of Major Depression (FH+) and Comparison Subjectsa

    aParticipants took samples immediately after awakening and then twice more at 15-minute intervals. Salivary cortisol levels were significantly greater on workdays than on nonworkdays (F=10.13, df=1, 99, p=0.002) and significantly greater in the FH+ group on both days (F=15.46, df=1, 99, p<0.001).

    Figure 1. Salivary Cortisol Levels in Subjects Without Depression But With a Parent With a History of Major Depression (FH+) and Comparison SubjectsaaParticipants took samples immediately after awakening and then twice more at 15-minute intervals. Salivary cortisol levels were significantly greater on workdays than on nonworkdays (F=10.13, df=1, 99, p=0.002) and significantly greater in the FH+ group on both days (F=15.46, df=1, 99, p<0.001).
    +
    +1.
    Holsboer F: The corticosteroid receptor hypothesis of depression. Neuropsychopharmacol 2000; 23:477—501
     
    +2.
    Young AH: Cortisol in mood disorders. Stress 2004; 7:205—208
     
    +3.
    Zobel AW, Nickel T, Sonntag A, Uhr M, Holsboer F, Ising M: Cortisol response in the combined dexamethasone/CRH test as predictor of relapse in patients with remitted depression: a prospective study. J Psychiatr Res 2001; 35:83—94
     
    +4.
    Pruessner JC, Wolf OT, Hellhammer DH, Buske-Kirschbaum A, von-Auer K, Jobst S, Kaspers F, Kirschbaum C: Free cortisol levels after awakening: a reliable biological marker for the assessment of adrenocortical activity. Life Sci 1997; 61:2539—2549
     
    +5.
    Bhagwagar Z, Hafizi S, Cowen PJ: Increased salivary cortisol after waking in depression. Psychopharmacol 2005; 182:54—57
     
    +6.
    Bhagwagar Z, Hafizi S, Cowen PJ: Increase in concentration of waking salivary cortisol in recovered patients with depression. Am J Psychiatry 2003; 160:1890—1891
     
    +7.
    Ising M, Lauer CJ, Holsboer F, Modell S: The Munich Vulnerability Study on Affective Disorders: premorbid neuroendocrine profile of affected high-risk probands. J Psychiatr Res 2005; 39:21—28
     
    +8.
    Sullivan PF, Neale MC, Kendler KS: Genetic epidemiology of major depression: review and meta-analysis. Am J Psychiatry 2000; 157:1552—1562
     
    +9.
    Weissman M, Fendrich M, Warner V, Wickramaratne P: Incidence of psychiatric disorder in offspring at high and low risk for depression. Am J Child Adolesc Psychiatry 1992; 31:640—648
     
    +10.
    Beardslee WR, Versage EM, Gladstone TRG: Children of affectively ill parents: a review of the past 10 years. Am J Child Adolesc Psychiatry 1998; 37:1134—1141
     
    +11.
    First MB, Spitzer RL, Gibbon M, Williams JBW: Structured Clinical Interview for DSM-IV Axis I Disorders—Clinician Version. Washington, DC, American Psychiatric Press, 1997
     
    +12.
    Andreasen NC, Rice JA, Endicott J, Reich T, Coryell W: The family history approach to diagnosis. Arch Gen Psychiatry 1986; 43:421—429
     
    +13.
    Kendler KS, Gardner CO, Prescott CA: Toward a comprehensive developmental model for major depression in women. Am J Psychiatry 2002; 159:1133—1145
     
    +14.
    Parker G: Parental characteristics in relation to depressive disorders. Br J Psychiatry 1979; 134:138—147
     
    +15.
    Patton GC, Coffey C, Posterino M, Carlin JB, Wolfe R: Parental "affectionless control" in adolescent depressive disorder. Soc Psychiatr Epidemiol 2001; 36:475—480
     
    +16.
    Kessler RC, Davis CG, Kendler KS: Childhood adversity and adult psychiatric disorder in the US national comorbidity survey. Psychol Med 1997; 27:1101—1119
     
    +17.
    Goodyer IM, Herbert J, Tamplin A, Secher SM, Pearson J: Short-term outcome of major depression, II: life events, family dysfunction, and friendship difficulties as predictors of persistent disorder. J Am Acad Child Adolesc Psychiatry 1997; 36:474—480
     
    +18.
    Goodyer IM: Social adversity and mental functions in adolescents. Br J Psychiatry 2002; 181:383—386
     
    +19.
    Eysenck HJ, Eysenck SBG: Manual of the Eysenck Personality Scales (EPS Adult). London, Hodder and Stoughton, 1991
     
    +20.
    Nolen-Hoeksema S, Morrow J: A prospective study of depression and posttraumatic stress symptoms after a natural disaster: the 1989 Loma Priet earthquake. J Pers Soc Psychol 1991; 67:115—121
     
    +21.
    Aalto-Setala T, Marttunen M, Tuulio-Henriksson A, Poikolainen K, Lonnqvist J: Depressive symptoms in adolescence as predictors of early adulthood depressive disorders and maladjustment. Am J Psychiatry 2002; 159:1235—1237
     
    +22.
    Pruessner M, Hellhammer DH, Pruessner JC, Lupien S: Self-reported depressive symptoms and stress levels in healthy young men: associations with the cortisol response to awakening. Psychosom Med 2003; 65:92—99
     
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