The predictive value of cortisol levels on 2-year course of depression in older persons
Introduction
Late-life major depressive disorder (MDD) is a debilitating disease, with prevalence rates varying between 0.9% to 9.4% among older community-dwelling persons, and up to 42% among persons living in institutions (Djernes, 2006). Furthermore, about ten percent of the persons in this age group are suffering from minor depression (Beekman et al., 1999). The prognosis of late-life depression is poor as compared to depressions among younger adults. It was demonstrated that chronicity or recurrence of depression affects one-third of depressed older adults (Cole, 1999). Comijs et al. (2015) have recently shown an even more unfavourable prognosis in a large cohort of depressed elderly. They demonstrated that almost half (48.4%) of the depressed persons in this cohort were still suffering from depression at 2-year follow-up. Early onset of depression, higher severity, co-morbid dysthymia and/or physical chronic diseases alongside older age were identified as predictors of poorer course (Beekman et al., 2001, Comijs et al., 2015, Licht-Strunk et al., 2007). In addition to clinical predictors, previous research aimed to disentangle the pathophysiological processes involved in depression and their contribution to the course of depression.
Since decades, the central role of the Hypothalamic–Pituitary–Adrenal (HPA)-axis in the pathogenesis of depression was acknowledged (e.g. Gibbons and McHugh, 1962). However, the majority of studies on cortisol and depression in older persons had a cross-sectional design, limiting insight into the association between HPA-axis functioning and course trajectories of depressive disorders. Some studies focused on the association between cortisol and the onset of depression or depressive symptoms later in life (e.g. Nabeta et al., 2014, Chinthapalli, 2014, Geoffroy et al., 2013), however studies on the predictive value of HPA-axis functioning on the course of current depressive disorders in older persons are lacking. Likewise, the majority of studies on adults examine the impact of HPA-axis functioning on either onset or recurrence of depression (Bockting et al., 2012, Lok et al., 2012, Hardeveld et al., 2015, Dedovic and Ngiam, 2015, Vrshek-Schallhorn et al., 2013). One study examined the association between cortisol and course trajectories of both depression and anxiety disorders in an adult population (aged 18–65 years). It demonstrated that a lower cortisol awakening response was associated with an unfavourable course of illness (Vreeburg et al., 2013). Finally, it has been suggested that an impaired signaling pathway via corticosteroid-activated mineralocorticoid and glucocorticoid receptors would lead to an impaired negative feedback regulation of the HPA system. This could cause high levels of cortisol, which in turn may be associated with unfavorable course of depression (Schüle et al., 2009). Hence, the Dexamethasone Suppression test (DST) was propagated as a putative predictor for course of depressive disorders (e.g. Schweitzer et al., 1987, Charles et al., 1989). However, since then, results from research on its predictive value were inconclusive, and research among older persons is lacking.
Although Bremmer et al. (2007) and Penninx et al. (2007) demonstrated a U-shaped association with both lower cortisol levels and higher cortisol levels being associated with depression in a cross-sectional population based study, a recent meta-analysis (Belvederi Murri et al., 2014) and our own findings (Rhebergen et al., 2015) could not replicate this. Nevertheless, when studying the predictive value of cortisol on the course of depression in older persons, one needs to take a possible U-shape into account, since neglect of this non-linear association may potentially mask underlying associations.
The Netherlands Study of Depression in Older Persons (NESDO) gives us the opportunity to investigate the association between cortisol and longitudinal course of late-life depressive disorders. The aim of this study is to examine the predictive value of cortisol on the 2-year course of depression in older persons, aged 60–93 years. To address the issue of a putative non-linear association, cortisol measures will be divided into tertiles, including lower, average or higher cortisol levels. We hypothesize that lower cortisol levels, a lower awakening response and lower Dexamethasone Suppression ratio may predict an unfavourable course trajectory of depressive disorders in older persons, as compared to average or higher cortisol levels or Dexamethasone Suppression ratio.
Section snippets
Study sample
Data were obtained from the Netherlands Study of Depression in Older Persons (NESDO; Comijs et al., 2011; http://nesdo.amstad.nl). NESDO is a longitudinal cohort of 378 currently depressed persons and 132 persons without a lifetime depression diagnosis aged 60–93 years (n = 510). Respondents were recruited from five different regions in the Netherlands. Both patients from mental health care institutes and patients from general practitioners participated, enabling inclusion of both healthy control
Results
Baseline characteristics are presented in Table 1. The mean age in our study population was 70.2 (±7.3) years, 63.8% were female and 103 persons (41.9%) were still diagnosed with MDD at 2-year follow-up. Chronic depression and higher depression severity at baseline were associated with persistence of depressive disorder at follow-up. Table 1 also shows that the persons with MDD at 2-year follow-up were more likely to have at baseline either low or high evening cortisol levels and to have a
Discussion
To date, findings on the predictive value of cortisol levels for the course of depression are scarce and not unequivocal, and prospective studies on older persons are lacking. In this study we aimed to gain insight in the prognostic value of cortisol levels on the course of major depressive disorder in older persons. Both higher and lower evening cortisol levels at baseline were associated with poorer course of MDD. Post-hoc analyses, with exclusion of smokers, demonstrated that in particular
Conflict of interest
We state that there are no conflicts of interest. Funding sources had no role in study design, in the collection, analysis and interpretation of the data, in writing the report and in the decision to submit the article for publication.
Contributors
All authors contributed sufficiently to the development of the analysis-plan, the analyses of the data, the writing of the article and all authors agree with transference of the copy right to Psychoneuroendocrinology.
Funding
NESDO is funded through the Fonds NutsOhra (project 0701-065), Stichting tot Steun VCVGZ, NARSAD, The Brain and Behavious Research Fund (grant ID 41080), and the participating universities and mental health care organizations (VU University Medical Center, Leiden University Medical Center, University Medical Center Groningen, University Medical Center St Radboud, GGZ inGeest, GGNet, GGZ Nijmegen, Lentis, and Parnassia). Funding sources had no role in study design, in the collection, analysis
Acknowledgement
None.
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