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Effects of Pregnancy and Hormones on T cell Immune Regulation in Multiple Sclerosis
Multiple sclerosis (MS) is characterized by a dysregulated immune system leading to chronic inflammation in the central nervous system. Despite increasing number of treatments, many patients continue to deteriorate. A better understanding of the underlying disease mechanisms involved in driving disease is a pre-requisite for finding new biomarkers and new treatment targets. The improvement of MS during pregnancy, comparable to the beneficial effects of the most effective treatment, suggests that the transient and physiological immune tolerance established during pregnancy could serve as a model for successful immune regulation. Most likely the immune-endocrine alterations that take place dur...
Dynamic regulation of DNA methylation in human T-cell biology
T helper cells play a central role in orchestrating immune responses in humans. Upon encountering a foreign antigen, T helper cells are activated followed by a differentiation process where the cells are specialised to help combating the infection. Dysregulation of T helper cell activation, differentiation and function has been implicated in numerous diseases, including autoimmunity and cancer. Whereas gene-regulatory networks help drive T-cell differentiation, acquisition of stable cell states require heritable epigenetic signals, such as DNA methylation. Indeed, the establishment of DNA methylation patterns is a key part of appropriate T-cell differentiation but how this is regulated over ...
High Confidence Network Predictions from Big Biological Data
Biology functions in a most intriguing fashion, with human cells being regulated by multiplex networks of proteins and their dependent systems that control everything from proliferation to cell death. Notably, there are cases when these networks fail to function properly. In some diseases there are multiple small perturbations that push the otherwise healthy cells into a state of malfunction. These maladies are referred to as complex diseases, and include common disorders such as allergy, diabetes type II, and multiple sclerosis, and due to their complexity there is no universally defined approach to fully understand their pathogenesis or pathophysiology. While these perturbations can be mea...
Omic Network Modules in Complex diseases
Biological systems encompass various molecular entities such as genes, proteins, and other biological molecules, including interactions among those components. Understanding a given phenotype, the functioning of a cell or tissue, aetiology of disease, or cellular organization, requires accurate measurements of the abundance profiles of these molecular entities in the form of biomedical data. The analysis of the interplay between these different entities at various levels represented in the form of biological network provides a mechanistic understanding of the observed phenotype. In order to study this interplay, there is a requirement of a conceptual and intuitive framework which can model m...
Hormonal regulation of immune responses
Multiple sclerosis (MS) is a chronic autoimmune inflammatory disease of the central nervous system driven by immune dysregulation. Despite significant advancements in treatment options, many patients continue to deteriorate; thus, a deeper understanding of the underlying mechanisms that drive MS is crucial for identifying novel biomarkers and therapeutic strategies. Interestingly, disease symptoms improve transiently during pregnancy, with the most pronounced effects occurring in the third trimester. This improvement is followed by a postpartum exacerbation before disease activity returns to pre-pregnancy levels. Although the precise mechanisms behind this pregnancy-induced modulation remain...
Immune regulation at the foetal-maternal interface; implications for healthy and complicated pregnancies
For a successful pregnancy, the maternal immune system must acquire tolerance towards the paternal antigens present in the semi-allogeneic foetus. This tolerance is mainly established locally at the foetal-maternal interface, where foetally-derived trophoblasts invade the maternal endometrium (called decidua during pregnancy) and come in close proximity to maternal immune cells. The decidua is populated by maternal immune cells of a unique composition, characterised by their suppressive phenotypes that are essential for maintaining tissue homeostasis. Accordingly, failure of immune tolerance can lead to pregnancy complications. Macrophages and regulatory T-cells are enriched in the decidua a...
Immune regulation at the fetal?maternal interface with focus on decidual macrophages
A successful pregnancy requires that the maternal immune system adapts to tolerate the semi-allogeneic fetal-placental unit. This adaptation mainly occurs locally, i.e. at the fetal-maternal interface, where fetal-derived tissues come into close contact with maternal cells in the uterine endometrium (called decidua during pregnancy). Macrophages and regulatory T (Treg) cells are maternal immune cells that are enriched in the decidua and they likely play a central role in promoting fetal tolerance. However, the precise function of decidual macrophages and the factors regulating both macrophages and Treg cells in humans are unknown. The aim of this thesis was to characterize the phenotype and ...
Biomarkers and Disease Activity in Multiple Sclerosis
This thesis focuses on disease activity in clinically isolated syndrome (CIS) and newly diagnosed relapsing remitting multiple sclerosis (RRMS). The papers are based on data from 41 patients in a prospective longitudinal cohort study. All patients were untreated at baseline. Age- and sex-matched healthy controls (n=22) for blood and cerebrospinal fluid (CSF) samples were recruited from blood donors. Paper I evaluated the prognostic value of baseline levels of CXCL1, CXCL8, CXCL10, CXCL13, CCL22, neurofilament light chain (NFL), neurofilament heavy chain, glial fibrillary acidic protein, chitinase-3-like-1 (CHI3L1), matrix metalloproteinase-9 (MMP-9) and osteopontin in CSF in relation to dise...
Identification of candidate genes involved in Mercury Toxicokinetics and Mercury Induced Autoimmunity
BACKGROUND: Autoimmune diseases require the involvement and activation of immune cells and occur when the body builds up an immune response against its own tissues. This process takes place due to the inability to distinguish self-antigen from foreign antigen. Systemic autoimmunity represents an important cause of morbidity and mortality in humans. The mechanisms triggering autoimmune responses are complex and involve a network of genetic factors. Genome wide association study (GWAS) is a powerful method, used to identify genetic risk factors in numerous diseases, such as systemic autoimmune diseases. The goal of GWAS is to identify these genetic risk factors in order to make predictions abo...
