Granulocyte


Granulocytes are a category of white blood cells in the innate immune system characterized by the presence of granules in their cytoplasm. They are also called polymorphonuclear leukocytes because of the varying shapes of the nucleus, which is usually lobed into three segments. This distinguishes them from the mononuclear agranulocytes. In common parlance, the term polymorphonuclear leukocyte often refers specifically to "neutrophil granulocytes", the most abundant of the granulocytes; the other types have lower numbers of lobes. Granulocytes are produced via granulopoiesis in the bone marrow.

Types

There are four types of granulocytes :
Except for the mast cells, their names are derived from their staining characteristics; for example, the most abundant granulocyte is the neutrophil granulocyte, which has neutrally staining cytoplasmic granules.

Neutrophils

Neutrophils are normally found in the bloodstream and are the most abundant type of phagocyte, constituting 60% to 65% of the total circulating white blood cells, and consisting of two subpopulations: neutrophil-killers and neutrophil-cagers. One litre of human blood contains about five billion neutrophils, which are about 12–15 micrometres in diameter. Once neutrophils have received the appropriate signals, it takes them about thirty minutes to leave the blood and reach the site of an infection. Neutrophils do not return to the blood; they turn into pus cells and die. Mature neutrophils are smaller than monocytes, and have a segmented nucleus with several sections; each section is connected by chromatin filaments. Neutrophils do not normally exit the bone marrow until maturity, but during an infection neutrophil precursors called myelocytes and promyelocytes are released.
Neutrophils have three strategies for directly attacking micro-organisms: phagocytosis, release of soluble anti-microbials, and generation of neutrophil extracellular traps.
Neutrophils are professional phagocytes: they are ferocious eaters and rapidly engulf invaders coated with antibodies and complement, as well as damaged cells or cellular debris. The intracellular granules of the human neutrophil have long been recognized for their protein-destroying and bactericidal properties. Neutrophils can secrete products that stimulate monocytes and macrophages; these secretions increase phagocytosis and the formation of reactive oxygen compounds involved in intracellular killing.
Neutrophils have two types of granules; primary granules and secondary granules. Primary granules contain cationic proteins and defensins that are used to kill bacteria, proteolytic enzymes and cathepsin G to break down proteins, lysozyme to break down bacterial cell walls, and myeloperoxidase. In addition, secretions from the primary granules of neutrophils stimulate the phagocytosis of IgG antibody-coated bacteria. The secondary granules contain compounds that are involved in the formation of toxic oxygen compounds, lysozyme, and lactoferrin. Neutrophil extracellular traps comprise a web of fibers composed of chromatin and serine proteases that trap and kill microbes extracellularly. Trapping of bacteria is a particularly important role for NETs in sepsis, where NET are formed within blood vessels.

Eosinophils

Eosinophils also have kidney-shaped lobed nuclei. The number of granules in an eosinophil can vary because they have a tendency to degranulate while in the blood stream. Eosinophils play a crucial part in the killing of parasites because their granules contain a unique, toxic basic protein and cationic protein ; receptors that bind to IgE are used to help with this task. These cells also have a limited ability to participate in phagocytosis, they are professional antigen-presenting cells, they regulate other immune cell functions, they are involved in the destruction of tumor cells, and they promote the repair of damaged tissue. A polypeptide called interleukin-5 interacts with eosinophils and causes them to grow and differentiate; this polypeptide is produced by basophils and by T-helper 2 cells.

Basophils

Basophils are one of the least abundant cells in bone marrow and blood. Like neutrophils and eosinophils, they have lobed nuclei; however, they have only two lobes, and the chromatin filaments that connect them are not very visible. Basophils have receptors that can bind to IgE, IgG, complement, and histamine. The cytoplasm of basophils contains a varied amount of granules; these granules are usually numerous enough to partially conceal the nucleus. Granule contents of basophils are abundant with histamine, heparin, chondroitin sulfate, peroxidase, platelet-activating factor, and other substances.
When an infection occurs, mature basophils will be released from the bone marrow and travel to the site of infection. When basophils are injured, they will release histamine, which contributes to the inflammatory response that helps fight invading organisms. Histamine causes dilation and increased permeability of capillaries close to the basophil. Injured basophils and other leukocytes will release another substance called prostaglandins that contributes to an increased blood flow to the site of infection. Both of these mechanisms allow blood-clotting elements to be delivered to the infected area. Increased permeability of the inflamed tissue also allows for more phagocyte migration to the site of infection so that they can consume microbes.

Mast cells

Mast cells are a type of granulocyte that are present in tissues; they mediate host defense against pathogens and allergic reactions, particularly anaphylaxis. Mast cells are also involved in mediating inflammation and autoimmunity as well as mediating and regulating neuroimmune system responses.

Development

Granulocytes are derived from stem cells residing in the bone marrow. The differentiation of these stem cells from pluripotent hematopoietic stem cell into granulocytes is termed granulopoiesis. Multiple intermediate cell types exist in this differentiation process, including myeloblasts and promyelocytes.

Function

Granule contents

Examples of toxic materials produced or released by degranulation by granulocytes on the ingestion of microorganisms are:
Granulocytopenia is an abnormally low concentration of granulocytes in the blood. This condition reduces the body's resistance to many infections. Closely related terms include agranulocytosis and neutropenia. Granulocytes live only one to two days in circulation, so transfusion of granulocytes as a therapeutic strategy would confer a very short-lasting benefit. In addition, there are many complications associated with such a procedure.
There is usually a granulocyte chemotactic defect in individuals suffering from type 1 diabetes mellitus.
Research suggests giving granulocyte transfusions to prevent infections decreased the number of people who had a bacterial or fungal infection in the blood. Further research suggests participants receiving therapeutic granulocyte transfusions show no difference in clinical reversal of concurrent infection.

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