Granulocyte - wikipedia Granulocyte Granulocyte An eosinophilic granulocyte. Details System Immune system Identifiers MeSH D006098 Anatomical terms of microanatomy ( edit on Wikidata ) Granulocytes are a category of white blood cells characterized by the presence of granules in their cytoplasm. They are also called polymorphonuclear leukocytes ( PMN, PML, or PMNL ) 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 ( eosinophils, basophils, and mast cells ) have lower numbers. Granulocytes are produced via granulopoiesis in the bone marrow. Contents 1 Types 1.1 Neutrophils 1.2 Eosinophils 1.3 Basophils 1.4 Mast cells 2 Development 3 Function 3.1 Granule contents 4 Clinical significance 5 Additional images 6 See also 7 References 8 Bibliography 9 External links Types There are four types of granulocytes : Basophils Eosinophils Neutrophils 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 Main article : Neutrophil A neutrophil with a segmented nucleus ( center and surrounded by erythrocytes ), the intra-cellular granules are visible in the cytoplasm ( Giemsa - stained high magnification ) 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 ( 5x10 ) neutrophils, which are about 12 -- 15 micrometers 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 ( two to five segments ) ; 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 ( ingestion ), release of soluble anti-microbials ( including granule proteins ), and generation of neutrophil extracellular traps ( NETs ). 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 ( azurophilic ) granules ( found in young cells ) and secondary ( specific ) granules ( which are found in more mature cells ). Primary granules contain cationic proteins and defensens that are used to kill bacteria, proteolytic enzymes and cathepsin G to break down ( bacterial ) proteins, lysozyme to break down bacterial cell walls, and myeloperoxidase ( used to generate toxic bacteria - killing substances ). 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 ( used to take essential iron from bacteria ). Neutrophil extracellular traps ( NETs ) 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 Main article : Eosinophil Eosinophils also have kidney - shaped lobed nuclei ( two to four lobes ). 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 ( e.g., enteric nematodes ) because their granules contain a unique, toxic basic protein and cationic protein ( e.g., cathepsin ) ; 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 ( e.g., CD4+ T cell, dendritic cell, B cell, mast cell, neutrophil, and basophil 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. Basophils Main article : Basophil A basophil with lobed nuclei surrounded by erythrocytes Basophils are one of the least abundant cells in bone marrow and blood ( occurring at less than two percent of all cells ). 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 ( this begins the recovery process and blocks the travel of microbes to other parts of the body ). 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 See article : Mast cell Mast cells are a type of granulocyte that are present in tissues ; they mediate host defense against pathogens ( e.g., parasites ) 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 : Antimicrobial agents ( Defensins and Eosinophil cationic protein ) Enzymes Acid hydrolases : further digest bacteria Lysozyme : dissolves cell walls of some gram - positive bacteria Low pH vesicles ( 3.5 - 4.0 ) Toxic nitrogen oxides ( nitric oxide ) Toxic oxygen - derived products ( e.g., superoxide, hydrogen peroxide, hydroxy radicals, singlet oxygen, hypohalite ) Clinical significance 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 ( etymologically, `` no granulocytes at all '' ; clinically, granulocyte levels less than 5 % of normal ) and neutropenia ( deficiency of neutrophil granulocytes ). Granulocytes live only one to two days in circulation ( four days in spleen or other tissue ), 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 insulin - dependent diabetes mellitus. Additional images Blood cell lineage Hematopoiesis See also Blood count Haematopoiesis Immune system Innate immune system Trogocytosis White blood cell References Jump up ^ WebMD ( 2009 ). `` granulocyte ''. Webster 's New World Medical Dictionary ( 3rd ed. ). Houghton Mifflin Harcourt. p. 181. ISBN 978 - 0 - 544 - 18897 - 6. Jump up ^ WebMD ( 2009 ). `` leukocyte, polymorphonuclear ''. Webster 's New World Medical Dictionary ( 3rd ed. ). Houghton Mifflin Harcourt. p. 244. ISBN 978 - 0 - 544 - 18897 - 6. ^ Jump up to : Breedveld A, Groot Kormelink T, van Egmond M, de Jong EC ( October 2017 ). `` Granulocytes as modulators of dendritic cell function ''. J. Leukoc. Biol. 102 ( 4 ) : 1003 -- 1016. doi : 10.1189 / jlb. 4MR0217 - 048RR. PMID 28642280. Jump up ^ Stvrtinová, Viera ; Ján Jakubovský and Ivan Hulín ( 1995 ). `` Neutrophils, central cells in acute inflammation ''. Inflammation and Fever from Pathophysiology : Principles of Disease. Computing Centre, Slovak Academy of Sciences : Academic Electronic Press. ISBN 80 - 967366 - 1 - 2. Archived from the original on December 31, 2010. Retrieved March 28, 2009. 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Clinical & Experimental Immunology. 151 ( 1 ) : 139 -- 45. doi : 10.1111 / j. 1365 - 2249.2007. 03532. x. PMC 2276935. PMID 17991288. ^ Jump up to : Mayer, Gene ( 2006 ). `` Immunology -- Chapter One : Innate ( non-specific ) Immunity ''. Microbiology and Immunology On - Line Textbook. USC School of Medicine. Retrieved November 12, 2008. Jump up ^ Soehnlein, Oliver ; Kai - Larsen, Ylva ; Frithiof, Robert ; Sorensen, Ole E. ; Kenne, Ellinor ; Scharffetter - Kochanek, Karin ; Eriksson, Einar E. ; Herwald, Heiko ; Agerberth, Birgitta ; Lindbom, Lennart ( 2008 ). `` Neutrophil primary granule proteins HBP and HNP1 -- 3 boost bacterial phagocytosis by human and murine macrophages ''. Journal of Clinical Investigation. 118 ( 10 ) : 3491 -- 502. doi : 10.1172 / JCI35740. PMC 2532980. PMID 18787642. Jump up ^ Clark, Stephen R ; Ma, Adrienne C ; Tavener, Samantha A ; McDonald, Braedon ; Goodarzi, Zahra ; Kelly, Margaret M ; Patel, Kamala D ; Chakrabarti, Subhadeep ; McAvoy, Erin ; Sinclair, Gary D ; Keys, Elizabeth M ; Allen - Vercoe, Emma ; Devinney, Rebekah ; Doig, Christopher J ; Green, Francis HY ; Kubes, Paul ( 2007 ). `` Platelet TLR4 activates neutrophil extracellular traps to ensnare bacteria in septic blood ''. Nature Medicine. 13 ( 4 ) : 463 -- 69. doi : 10.1038 / nm1565. PMID 17384648. ^ Jump up to : Hess, Charles E. `` Segmented Eosinophil ''. University of Virginia Health System. Retrieved 2009 - 04 - 10. ^ Jump up to : Baron, Samuel ( editor ) ( 1996 ). Medical Microbiology ( 4th edition ). EditionThe University of Texas Medical Branch at Galveston. ISBN 0 - 9631172 - 1 - 1. CS1 maint : Extra text : authors list ( link ) Jump up ^ Gleich, Gerald J. ; Adolphson, Cheryl R. ( 1986 ). `` The Eosinophilic Leukocyte : Structure and Function ''. 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Jump up ^ Lee DM, Friend DS, Gurish MF, Benoist C, Mathis D, Brenner MB ( September 2002 ). `` Mast cells : a cellular link between autoantibodies and inflammatory arthritis ''. Science. 297 ( 5587 ) : 1689 -- 92. doi : 10.1126 / science. 1073176. PMID 12215644. Jump up ^ Polyzoidis S, Koletsa T, Panagiotidou S, Ashkan K, Theoharides TC ( 2015 ). `` Mast cells in meningiomas and brain inflammation ''. J Neuroinflammation. 12 ( 1 ) : 170. doi : 10.1186 / s12974 - 015 - 0388 - 3. PMC 4573939. PMID 26377554. MCs originate from a bone marrow progenitor and subsequently develop different phenotype characteristics locally in tissues. Their range of functions is wide and includes participation in allergic reactions, innate and adaptive immunity, inflammation, and autoimmunity ( 34 ). In the human brain, MCs can be located in various areas, such as the pituitary stalk, the pineal gland, the area postrema, the choroid plexus, thalamus, hypothalamus, and the median eminence ( 35 ). In the meninges, they are found within the dural layer in association with vessels and terminals of meningeal nociceptors ( 36 ). MCs have a distinct feature compared to other hematopoietic cells in that they reside in the brain ( 37 ). MCs contain numerous granules and secrete an abundance of prestored mediators such as corticotropin - releasing hormone ( CRH ), neurotensin ( NT ), substance P ( SP ), tryptase, chymase, vasoactive intestinal peptide ( VIP ), vascular endothelial growth factor ( VEGF ), TNF, prostaglandins, leukotrienes, and varieties of chemokines and cytokines some of which are known to disrupt the integrity of the blood - brain barrier ( BBB ) ( 38 -- 40 ). They key role of MCs in inflammation ( 34 ) and in the disruption of the BBB ( 41 -- 43 ) suggests areas of importance for novel therapy research. Increasing evidence also indicates that MCs participate in neuroinflammation directly ( 44 -- 46 ) and through microglia stimulation ( 47 ), contributing to the pathogenesis of such conditions such as headaches, ( 48 ) autism ( 49 ), and chronic fatigue syndrome ( 50 ). In fact, a recent review indicated that peripheral inflammatory stimuli can cause microglia activation ( 51 ), thus possibly involving MCs outside the brain. Bibliography Campbell, Neil A., Reece Jane B., Biology ( 6th edition ), Pearson Education, Inc., 2002 ISBN 0 - 8053 - 6624 - 5. Delves, P.J., Martin, S.J., Burton, D.R. and Roit I.M. Roitt 's Essential Immunology ( 11th edition ), Blackwell Publishing, 2006, ISBN 978 - 1 - 4051 - 3603 - 7. Ernst J.D. and Stendahl O., ( editors ), Phagocytosis of Bacteria and Bacterial Pathogenicity, Cambridge University Press, 2006, ISBN 0 - 521 - 84569 - 6. Website. Hoffbrand, A.V., Pettit, J.E. and Moss, P.A.H., Essential Haematology ( 4th edition ), Blackwell Science, 2005, ISBN 0 - 632 - 05153 - 1. Paoletti R., Notario A. and Ricevuti G., ( editors ), Phagocytes : Biology, Physiology, Pathology, and Pharmacotherapeutics, The New York Academy of Sciences, 1997, ISBN 1 - 57331 - 102 - 2. Robinson J.P. and Babcock G.F., ( editors ), Phagocyte Function -- A guide for research and clinical evaluation, Wiley -- Liss, 1998, ISBN 0 - 471 - 12364 - 1. Sompayrac, L. How the Immune System Works ( 3rd edition ), Blackwell Publishing, 2008, ISBN 978 - 1 - 4051 - 6221 - 0. 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Question: what is the most common type of granulocyte
Answer: neutrophil granulocytes