How does the immune system's response to insulin affect the development of type 1 diabetes?5 answersThe immune system plays a crucial role in the development of type 1 diabetes (T1D) by targeting insulin-producing β-cells. Various immune cells, such as dendritic cells, macrophages, lymphocytes, and natural killer cells, are involved in the immune responses associated with T1D. Additionally, the presence of hybrid insulin peptides (HIPs) triggers T-cell responses that precede the onset of clinical symptoms, with a shift towards predominantly inflammatory responses in individuals progressing to T1D. Type I interferons (TI-IFN) have been found to inhibit interleukin-10 (IL-10) signaling in effector and regulatory T cells, impacting their responses and correlating with diabetes development in NOD mice. This interplay between immune cells, cytokines, and insulin-related peptides highlights the complex dynamics of autoimmune diabetes pathogenesis and suggests potential targets for intervention strategies.
How does the immune metabolism of macrophages contribute to the pathogenesis of diabetes mellitus?5 answersThe immune metabolism of macrophages plays a crucial role in the pathogenesis of diabetes mellitus. In diabetes, changes in immune cell metabolism, driven by environmental signals like glucose, lipids, and insulin, lead to altered functions of macrophages, contributing to diabetes-associated complications. Macrophages in diabetic conditions exhibit a pro-inflammatory phenotype, which is linked to the development of diabetic complications. Metabolic reprogramming of macrophages in response to high glucose exposure affects their functions, such as cytokine expression, phagocytosis, and bactericidal activity, ultimately impacting diabetic pathogenesis. Additionally, the dysregulation of macrophage metabolism in diabetes is associated with impaired glycolytic capacity, reduced phagocytosis, and sensitization to cytokine stimulation, further exacerbating the progression of diabetes.
Glucose in rheumatoid arthritis?5 answersGlucose metabolism in rheumatoid arthritis (RA) is a topic of interest in recent research. Studies suggest that glucose metabolism may be altered in RA, potentially contributing to the inflammatory phenotype of rheumatoid synovial fibroblasts and the pathophysiology of autoimmune diseases. Insulin resistance (IR) and impaired glucose tolerance are common in RA patients, and disease activity is associated with increased insulin resistance and impaired glucose metabolism. Factors such as inflammation markers, matrix metalloproteinase-3 (MMP3) levels, and disease activity indicators like DAS28-ESR are significant predictors of impaired glucose metabolism in RA. Dysglycaemia, including impaired glucose tolerance, is prevalent in RA patients and is associated with factors such as obesity, dyslipidemia, and elevated intercellular adhesion molecule-1 levels. The interaction between immune cells and glucose metabolism is also important in RA, with metabolic disorders impacting the progression of systemic inflammation and arthritic manifestations. Understanding the role of glucose metabolism in RA may provide insights into disease severity and potential therapeutic targets.
How does high blood glucose impact the survival of t cells in T1D?5 answersHigh blood glucose in T1D can impact the survival of T cells. The loss of tolerance to GAD65 (555-567) in diabetes-prone mice correlates with an impaired response to glucose, indicating a connection between T cell reactivity and diabetes pathogenesis. Additionally, autoreactive T cells in T1D produce pro-inflammatory cytokines such as IFN-γ, TNF-α, and IL-1β, which can induce β cell stress and death. The immune dysregulation during the early stages of T1D development can also impact β cell function, as evidenced by the decreased expression of glucose metabolism genes in islets from donors with T1D. However, further research is needed to fully understand the impact of high blood glucose on T cell survival in T1D.
How does high blood glucose affect the survival of t cells in type 1 diabetes?5 answersHigh blood glucose levels have been found to have modest effects on the survival of T cells in type 1 diabetes. In vitro studies showed that elevated levels of glucose had only modest effects on T cell proliferation and cytokine production. However, in patients with type 1 diabetes, enhanced intracellular glucose uptake in T cells was observed, which was associated with lower C-peptide levels and higher hemoglobin A1c levels. Patients with low T cell glucose uptake at onset of type 1 diabetes maintained higher levels of C-peptide and had a higher proportion of beta-cell function preservation during the disease course. These findings suggest that high blood glucose levels in type 1 diabetes may affect T cell survival and beta-cell function.
How does diabetes affect the immune system?5 answersDiabetes affects the immune system by causing chronic inflammation and immune dysregulation. In both type 1 diabetes (T1D) and type 2 diabetes (T2D), immune cells such as dendritic cells, macrophages, and lymphocytes are involved in the immune response. In T2D, obesity and insulin resistance contribute to chronic inflammation, which primarily occurs in adipose tissue. This chronic inflammation leads to an imbalance of proinflammatory and anti-inflammatory cytokines, further exacerbating immune dysfunction. In T1D, the immune system targets and destroys insulin-producing cells, leading to insufficient insulin production. The dysregulation of immune cells and cytokines in both types of diabetes can contribute to increased susceptibility to infections. Understanding the mechanisms behind immune dysfunction in diabetes can help develop novel treatments and preventive strategies for infectious diseases and diabetes-related complications.