Impacts of Early Life Adversity on Microbiota and Immune Functioning in Individuals with Major Depressive Disorder

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Creator: 

Richards, Carley Lyn

Date: 

2018

Abstract: 

Early life stress may contribute to depression vulnerability, possibly through immune system development and gut microbial colonization patterns. Increased pro-inflammatory cytokines and differences in gut microbiota composition have been seen in depressed individuals. The current study investigated inflammatory and bacterial profiles of 39 individuals with a current major depressive episode and 43 healthy volunteers with varying severity of childhood trauma. Plasma interleukin (IL)-6/IL-10 ratios was positively correlated with depression severity, and childhood trauma explained variance in severity of symptoms above and beyond that accounted for by the IL-6/IL-10 ratios. Expression of Faecalibacterium prausnitzi (F. prausnitzi) in stool was decreased in depressed participants compared to healthy controls. Importantly, this relationship was significant only in participants who had experienced moderate-to-severe physical neglect. These findings suggest a relationship between particular gut bacteria and depressive symptoms that is dependent on the presence of specific types of early life trauma.

Subject: 

Mental Health
Immunology

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Science: 
M.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Neuroscience

Parent Collection: 

Theses and Dissertations

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