There are two main types of transplant rejection; T cell mediated and antibody mediated and antibody mediated transplant rejection. These rejections are divided into hyperacute, acute and chronic rejection. In order to reduce and prevent solid organ rejection, patients who receive an organ transplant take immunosuppressive agents to suppress their immune system. In this video […]

George syndrome (22q11.2 deletion) and Job syndrome (hyper-IgE) explained with clear clinical signs and immune defects. Learn how these well-defined genetic syndromes cause recurrent infections, immune dysfunction, and characteristic physical findings. This video breaks down DiGeorge syndrome’s pharyngeal pouch failure from chromosome 22 microdeletion—remember “catch 22”—and its CATCH-22 features: cardiac defects, abnormal facies, thymic hypoplasia, […]

Explore Chediak-Higashi Syndrome, a rare autosomal recessive disorder affecting lysosomal trafficking and immune cell function. This video explains its genetic basis, characteristic features like recurrent infections and albinism, and the underlying pathophysiology driving its clinical presentation.

Explore the role of Interleukin-1 (IL-1) in immune responses, including its effects on inflammation, fever, and cytokine signaling. This video also covers the pharmacology of IL-1 antagonists, detailing their mechanisms of action and clinical applications in inflammatory diseases.

Learn about Interleukin-6 (IL-6), a key cytokine involved in inflammation, immune regulation, and acute phase responses. This video also explains the pharmacology of IL-6 antagonists like tocilizumab, including their mechanism of action and clinical use in conditions such as rheumatoid arthritis and cytokine release syndrome.

Hydroxychloroquine explained: how this disease-modifying antirheumatic drug (DMARD) treats autoimmune conditions and why it’s first-line for systemic lupus erythematosus. Hydroxychloroquine (plaquenil) is an antimalarial with powerful immunomodulatory effects used in SLE, rheumatoid arthritis, and juvenile inflammatory arthritis; it lowers mortality and reduces the risk of lupus nephritis by blocking antigen processing, T-cell activation, and autoantibody […]

Type 3 hypersensitivity (immune complex) reactions explained: how antigen–antibody complexes trigger complement-driven inflammation. Learn the mechanism of immune complex formation, clearance failures, and tissue deposition that cause localized (Arthus reaction, hypersensitivity pneumonitis) and systemic (serum sickness) disease. This video breaks down how antigens—from drugs, inhaled particles, bacteria like group A Streptococcus, or even self-antigens in […]

Explore Type II hypersensitivity, a cytotoxic immune reaction where antibodies target cells leading to destruction via the complement system or immune cells. This video covers the causes, underlying pathophysiology, and key examples such as autoimmune hemolytic anemia and Goodpasture syndrome.

Learn about DRESS Syndrome (Drug Reaction with Eosinophilia and Systemic Symptoms), a severe drug-induced hypersensitivity reaction involving multiple organs. This video explains its causes, immune-mediated pathophysiology, hallmark clinical signs like rash and eosinophilia, and essential treatment strategies.

Dive into the role of NOD-like receptors and the inflammasome in innate immunity, focusing on their activation pathways and inflammatory response. This video breaks down complex molecular interactions essential for understanding host defense and disease mechanisms.

Learn how Toll-like receptors (TLRs) detect microbial components and activate signaling pathways that drive innate immune responses. This video provides an overview of different TLR types, their ligands, and their role in linking innate and adaptive immunity.

Learn how MHC II molecules present extracellular antigens to helper T cells, playing a key role in activating adaptive immune responses. This video explains the antigen processing steps, including endocytosis, peptide loading in endosomes, and the involvement of the invariant chain and HLA-DM.

Explore how MHC I molecules present intracellular antigens to cytotoxic T cells, a crucial step in immune surveillance against infected or abnormal cells. This video explains the antigen processing pathway, including proteasome degradation, peptide transport via TAP, and MHC I loading in the endoplasmic reticulum.

Learn how antibodies function in the immune system by neutralizing pathogens, activating complement, and tagging invaders for destruction by other immune cells. This video breaks down the key roles of different antibody classes and their importance in immune responses.

Discover the structure and function of antibodies, key proteins produced by B cells that help identify and neutralize pathogens. This video explains the different antibody classes, their roles in immune defense, and how they interact with antigens.

Learn how the adaptive immune system provides specific and long-lasting defense through the actions of B cells and T cells. This video explains antigen recognition, clonal expansion, memory formation, and how adaptive responses are tailored to different pathogens.

Discover how mucosal immunity protects the body at surfaces like the respiratory, gastrointestinal, and urogenital tracts through specialized cells and secretory antibodies. This video explains key components such as M cells, IgA, and the role of gut-associated lymphoid tissue (GALT) in defending against pathogens.

Explore the role of IgA antibodies in mucosal immunity, focusing on their production, secretion, and protective functions at epithelial surfaces. This video explains how IgA helps neutralize pathogens while preserving immune tolerance in environments like the gut and respiratory tract.

Delve deeper into mucosal immunity by examining the roles of secretory IgA, antigen sampling, and immune tolerance at mucosal surfaces. This video explains how immune cells coordinate responses while maintaining balance between protection and tolerance in environments like the gut and respiratory tract.

Explore the foundations of mucosal immunity, focusing on the structural organization and key immune components of mucosal surfaces. This video introduces the roles of epithelial barriers, mucosal lymphoid tissues, and the first-line defense mechanisms against pathogens.

Explore the mechanisms of cell-mediated immunity, focusing on how T cells identify and destroy infected or abnormal cells. This video explains the roles of CD4+ helper T cells and CD8+ cytotoxic T cells in coordinating targeted immune responses.

Explore the adaptive immune system and how it provides specific, long-lasting protection through the actions of B cells and T cells. This video explains how the body recognizes antigens, generates memory, and mounts targeted immune responses.

Learn how humoral immunity protects the body through the production of antibodies by B cells in response to extracellular pathogens. This video explains the activation, differentiation, and function of B cells and their role in long-term immune protection.