L25: Function of Myeloperoxidase (Granules in Neutrophils) скачать в хорошем качестве

L25: Function of Myeloperoxidase (Granules in Neutrophils)

#biotechnology #immunology #neutrophils #granulesinneutrophils #primarygranules #Myeloperoxidase This is the 5th video of chapter 2 of immunology and focuses on Neutrophils, and different types of granules in neutrophils especially focusing on Primary Granules and mechanisms of action of Myeloperoxidase. Granules in Neutrophils, Function of Myeloperoxidase The links to the other 4 videos are the following L2.1: Immunology; Hematopoiesis; Hematopoietic Stem Cell and Common Myeloid-Erythroid Progenitor    • L21: Hematopoiesis; Hematopoietic Stem Cel...   L2.2: Immunology; Hematopoiesis; Hematopoietic Stem Cell (HSC) and Common Lymphoid Progenitor    • L22: Hematopoiesis; Hematopoietic Stem Cel...   L2.3: Immunology; Granulocytes and Agranulocytes; A quick review    • L23: Granulocytes and Agranulocytes; An in...   L2.4: Immunology; Neutrophils; The first line defender/Granulopoiesis /Geimsa stain    • L24: How Neutrophils are formed (Neutrophi...   Neutrophils are a type of white blood cell, and their granules play a crucial role in their immune functions. Neutrophils contain four types of granules: Azurophilic Granules (Primary Granules): These granules are the largest and most abundant in neutrophils. They contain enzymes with antimicrobial properties, such as myeloperoxidase, elastase, and cathepsin G. These enzymes help neutrophils to destroy and digest engulfed pathogens, contributing to the cell's role in the immune response. Specific (Secondary) Granules: These granules are smaller than azurophilic granules and contain proteins and enzymes with specific functions in the immune response. Examples include lysozyme, lactoferrin, collagenase, and gelatinase. These granules are involved in processes like phagocytosis, inflammation, and tissue repair. Gelatinase Granules (Tertiary Granules): Gelatinase granules are the least understood among the three types. They contain enzymes like gelatinase, which can break down gelatin and other matrix proteins. The functions of these granules are not as well-defined as those of azurophilic and specific granules, but they likely play a role in tissue remodeling and immune response modulation. Secretory Granules: The release of these granules and their contents is tightly regulated and occurs during various stages of neutrophil activation. Neutrophils are crucial components of the innate immune system, and their ability to release granule contents aids in the neutralization and elimination of pathogens Myeloperoxidase (MPO) is an enzyme found in the azurophilic granules of neutrophils, a type of white blood cell. It plays a critical role in the immune system's defense against microbial invaders. The primary function of myeloperoxidase is to generate reactive oxygen species (ROS) and to catalyze the production of hypochlorous acid (HOCl). Here's how myeloperoxidase functions: ROS Production: Myeloperoxidase catalyzes the reaction between hydrogen peroxide (H₂O₂) and chloride ions (Cl⁻), resulting in the formation of hypochlorous acid (HOCl) and oxygen (O₂). This reaction is part of the respiratory burst, a process in which neutrophils generate reactive oxygen species to destroy pathogens. Microbial Killing: Hypochlorous acid (HOCl) is a powerful antimicrobial agent. It can directly damage and kill bacteria, viruses, and fungi by disrupting their cell membranes and interfering with essential cellular processes. Myeloperoxidase-generated HOCl contributes to the microbicidal activity of neutrophils during the process of phagocytosis. In summary, myeloperoxidase is a key player in the neutrophil's arsenal against invading microorganisms. By producing reactive oxygen species and hypochlorous acid, it contributes to the destruction and elimination of pathogens during the innate immune response.