An educational infographic timeline illustrating a century of scientific milestones in Type 1 Diabetes Mellitus (T1DM) research, focusing on pathogenesis and therapeutic interventions. The diagram transitions from the discovery of the pancreas's role in 1889 (depicted by a surgical pancreatectomy icon) to modern strategies like implantable niches in 2022. Key educational concepts include the autoimmune nature of T1DM, represented by circular insets showing T-cell, autoantibody (Y-shaped), and dendritic cell interactions with pancreatic beta-cells. Genetic and molecular mechanisms are highlighted through illustrations of HLA Class II molecules and DNA helices. Clinical advancements featured include environmental triggers (virus-induced autoimmunity via Coxsackie virus B4), immunological therapies (anti-CD3 antibodies in NOD mouse models), and the role of gut microbiota (depicting granulocytes and natural killer cells in the intestine). The visual serves as an overview of how animal models and genetic engineering have elucidated beta-cell destruction and informed transplantation techniques using syringe-mediated islet delivery into engineered microenvironments.

This pathophysiology diagram illustrates the cellular mechanisms of Type 1 Diabetes (T1D) within a pancreatic islet of Langerhans. The diagram is divided into three sequential panels. Panel 1 shows healthy endocrine cells: alpha (α) cells secreting glucagon, beta (β) cells secreting insulin, and delta (δ) cells secreting somatostatin, each expressing specific surface antigens. Panel 2 depicts an 'immune attack' phase where an autoreactive cytotoxic T cell recognizes a Chromogranin A (ChgA) peptide presented on the β-cell surface. Panel 3 illustrates the outcome: selective β-cell destruction ('Dead β cell') and the absence of insulin production, while α and δ cells remain intact and functional. The diagram also highlights the role of diagnostics, showing dextran-coated magnetofluorescent iron oxide nanoparticles being internalized by infiltrating macrophages and monocytes (insulitis). These nanoparticles serve as contrast agents for MRI to visualize microvascular leakage and inflammation in the pancreas. This educational tool demonstrates the transition from normal hormonal homeostasis to autoimmune-mediated islet dysfunction.

This pathophysiology diagram illustrates the link between HIV-associated gut dysbiosis and the development of Type 1 Diabetes Mellitus (T1DM). The upper section shows the gut lumen with decreased short-chain fatty acid (SCFA)-producing bacteria. An impaired gut barrier is depicted with HIV-infected epithelial cells, leading to a 'leaky gut' and the translocation of microbes and microbial products into the systemic circulation. This translocation triggers two primary pathways: 1) Systemic immune activation via Toll-like receptors (TLRs), involving CD4+/CD8+ T-cells, macrophages, dendritic cells (DCs), and monocytes, which promotes an autoimmune anti-islet response. 2) Direct interaction of microbial products with pancreatic beta cells, triggering intracellular signaling pathways including NOD2, TLR2/MyD88/NF-kB, and TLR3/MyD88. The diagram further highlights the role of Mucosal-Associated Invariant T (MAIT)-cells, which exhibit altered cytotoxicity and regulatory functions under these conditions. The final outcome is pancreatic beta-cell destruction (dead beta-cell) and the cessation of insulin production, illustrating a proposed mechanism for secondary autoimmune diabetes in people living with HIV (PLWH).