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Compr Psychiatry. 2020 Jan;96:152143. doi: 10.1016/j.comppsych.2019.152143. Epub 2019 Oct 31.

Longitudinal population subgroups of CRP and risk of depression in the ALSPAC birth cohort.

Author information

1
Department of Psychiatry, University of Cambridge, Cambridge, UK; Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, UK; Institute of Clinical Sciences, Imperial College London, London, UK. Electronic address: efo22@cam.ac.uk.
2
Department of Psychiatry, University of Cambridge, Cambridge, UK; Department of Kinanthropology, Charles University, Prague, Czech Republic.
3
Centre for Academic Mental Health, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; Division of Psychiatry, University College London, London, UK.
4
Division of Psychiatry, University College London, London, UK.
5
Department of Psychiatry, University of Cambridge, Cambridge, UK; Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, UK.

Abstract

BACKGROUND:

Meta-analyses confirm increased circulating C-reactive protein (CRP) levels in depression. Longitudinal studies have linked one-off measurements of CRP at baseline with increased risk of developing depressive symptoms subsequently at follow-up, but studies with repeat CRP measures from the same individuals are scarce.

METHODS:

We have examined whether longitudinal patterns of inflammation, based on three CRP measurements from childhood to early-adulthood, are associated with the risk of depression in early-adulthood in the Avon Longitudinal Study of Parents and Children, a prospective birth cohort.

RESULTS:

Using Gaussian mixture modelling of available CRP data from age 9, 15 and 18 years, we identified four population clusters/sub-groups reflecting different longitudinal patterns of CRP: persistently low (N=463, 29.5%); persistently high (N=371, 24%); decreasing (N=360, 23%); increasing (N=367, 23.5%). The increasing group showed a steep increase in CRP levels between adolescence and early-adulthood. Participants in this group had a higher risk of moderate/severe depression at age 18 years, compared with those with persistently low CRP; adjusted odds ratio (OR)=3.78 (95% Confidence Interval (CI), 1.46-9.81; p=0.006). The odds of moderate/severe depression were also increased for the persistently high CRP group, but this was not statistically significant; OR=2.54 (95% CI, 0.90-7.16).

LIMITATIONS:

Repeat CRP measures were available for a subset, who may not be representative of all cohort participants.

CONCLUSIONS:

The results suggest that an increasing pattern of inflammation from adolescence to early-adulthood is associated with risk of depression in early-adulthood.

KEYWORDS:

ALSPAC; C-reactive protein; CRP; Depression; Immunopsychiatry; Inflammation

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