Parental history of depression and higher basal salivary cortisol in unaffected child and adolescent offspring.

Introduction: There are contradictory findings regarding the associations of parental depression on the hypothalamic-pituitary-adrenal axis activity of their offspring. We aimed to explore the associations of parental depression on the diurnal salivary cortisol profile in their child and adolescent offspring.
Methods: A total of 189 unaffected child and adolescent offspring as determined by structured clinical interview were divided into 3 groups according to their parental history of depression, namely current parental depression (CPD, n = 27), past parental depression (PPD, n = 57), and no parental depression (NPD, n = 105). Diurnal saliva samples were collected to measure the cortisol awakening response and diurnal cortisol profile.
Results: CPD group had significantly higher basal cortisol level (mean ± SE = 11.9 ± 0.80 nmol/dl) than PPD group (mean ± SE = 9.7 ± 0.73 nmol/dl, post hoc p = .024) and NPD group (mean ± SE = 10.2 ± 0.52 nmol/dl, post hoc p = .031) and lower cortisol level at noon, but comparable cortisol levels in other time points. The cortisol awakening response reference to increase (AUCi) were significantly blunted in CPD group when compared with PPD and NPD (post hoc p < .01). Adjustment for potential confounding factors did not change major findings. Further analyses revealed that main influences were derived from current maternal depression.
Limitations: A single day of saliva sample.
Conclusion: Current but not past (lifetime) parental depression is associated with higher basal salivary cortisol and blunted cortisol awakening response in their children and adolescents.
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