Immune System Development

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Introduction

Lymphatic vessel development cartoon
Lymphatic vessel development[1]


Developing Human Thymus (Carnegie stage 22)
Developing Human Thymus (stage 22)

Development of the immune system will also link to cardiovascular development notes (blood and vessel) and bone marrow development. Two organs which also relate to this system are the thymus and spleen, which have in the past been included in endocrine and gastrointestinal tract development respectively. There are now also movies showing lymphocyte (B and T cells) traffic within adult lymph nodes.


The maternal immune system also has specialised functions and cells associated with implantation, placenta development and pregnancy.


  • During prenatal development, maternal IgG antibodies are transferred from about GA week 13 from maternal blood across the placenta. Placenta syncytiotrophoblast cell endosomes bind IgG, in maternal blood lacunae, through neonatal Fc receptors.
  • During early postnatal development, maternal IgA, IgM, IgG antibodies are transferred from breast milk into the infant gastrointestinal tract.
  • During postnatal development, the immune system matures..


Immune Links: Introduction | Blood | Spleen | Thymus | Lymphatic | Lymph Node | Antibody | Med Lecture - Lymphatic Structure | Med Practical | Immune Movies | Vaccination | Bacterial Infection | Abnormalities | Category:Immune
Historic Embryology  
1912 Development of the Lymphatic System | 1918 Gray's Lymphatic Images | 1916 Pig Lymphatics | 1919 Chicken Lymphatic | 1921 Spleen | 1922 Pig Stomach Lymphatics | Historic Disclaimer

Some Recent Findings

  • Tie1 is required for lymphatic valve and collecting vessel development[2] "Tie1 is a receptor tyrosine kinase with broad expression in embryonic endothelium. Reduction of Tie1 levels in mouse embryos with a hypomorphic Tie1 allele resulted in abnormal lymphatic patterning and architecture, decreased lymphatic draining efficiency, and ultimately, embryonic demise. ... Our findings reveal a fundamental role for Tie signaling during lymphatic vessel remodeling and valve morphogenesis and implicate it as a candidate gene involved in primary lymphedema."
  • The Nobel Prize in Physiology or Medicine 2011 Bruce A. Beutler and Jules A. Hoffmann for their discoveries concerning the activation of innate immunity and the other half to Ralph M. Steinman for his discovery of the dendritic cell and its role in adaptive immunity.
  • Regulation of lymphatic-blood vessel separation by endothelial Rac1.[3] "Sprouting angiogenesis and lymphatic-blood vessel segregation both involve the migration of endothelial cells, but the precise migratory molecules that govern the decision of blood vascular endothelial cells to segregate into lymphatic vasculature are unknown."
  • The development of intestinal lymphoid tissues at the interface of self and microbiota[4] "(postnatal) Intestinal lymphoid tissues face the challenging task of inducing adaptive immunity to pathogens, yet maintaining homeostasis with the enormous commensal microbiota. To that aim, the ancient partnership between self and flora has resulted in the generation of a unique set of lymphoid tissues capable of constant large-scale reformatting. A first set of lymphoid tissues, the mesenteric lymph nodes and Peyer's patches, are programmed to develop in the sterile environment of the fetus, whereas a second set of lymphoid tissues, the tertiary lymphoid tissues, are induced to form by the microbiota and inflammation."
  • Ordering human CD34+CD10-CD19+ pre/pro-B-cell and CD19- common lymphoid progenitor stages in two pro-B-cell development pathways.[5]"Here, we show a similar divergence in human B-cell development pathways between the Pax5(+)TdT(-) pre/pro-B differentiation pathway that gives rise to infant B-lineage leukemias and the early-B pathway."
  • Epithelial cells in fetal intestine produce chemerin to recruit macrophages.[6] "Macrophages are first seen in the fetal intestine at 11-12 wk and rapidly increase in number during the 12- to 22-wk period of gestation. The development of macrophage populations in the fetal intestine precedes the appearance of lymphocytes and neutrophils and does not require the presence of dietary or microbial antigens."
  • Ontogeny of reticular framework of white pulp and marginal zone in human spleen: immunohistochemical studies of fetal spleens from the 17th to 40th week of gestation. [7] "The reticular framework of the periarteriolar lymphoid sheath (PALS), lymph follicle (LF), and marginal zone (MZ) is thus heterogeneous in the fetal spleen, and the development of the heterogeneity is related to the ontogeny of the PALS, LF, and MZ."
More recent papers  
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This table shows an automated computer PubMed search using the listed sub-heading term.

  • Therefore the list of references do not reflect any editorial selection of material based on content or relevance.
  • References appear in this list based upon the date of the actual page viewing.

References listed on the rest of the content page and the associated discussion page (listed under the publication year sub-headings) do include some editorial selection based upon both relevance and availability.

Links: References | Discussion Page | Pubmed Most Recent | Journal Searches


Search term: Immune System Development

Shenglan Hu, Li Wang, Zongyong Jiang Dietary additive probiotics modulation of the intestinal microbiota. Protein Pept. Lett.: 2017; PubMed 28240160

Yang Wang, Robert Safirstein, Heino Velazquez, Xiao-Jia Guo, Lindsay Hollander, John Chang, Tian-Min Chen, Jian-Jun Mu, Gary V Desir Extracellular renalase protects cells and organs by outside-in signalling. J. Cell. Mol. Med.: 2017; PubMed 28238213

Meihang Li, Hugues Beauchemin, Natalija Popovic, Alan Peterson, Eva d'Hennezel, Ciriaco A Piccirillo, Chao Sun, Constantin Polychronakos The common, autoimmunity-predisposing 620Arg > Trp variant of PTPN22 modulates macrophage function and morphology. J. Autoimmun.: 2017; PubMed 28237724

Kathleen A Linder, Leen Alkhouli, Mayur Ramesh, George A Alangaden, Carol A Kauffman, Marisa H Miceli Effect of underlying immune compromise on the manifestations and outcomes of group A streptococcal bacteremia. J. Infect.: 2017; PubMed 28237623

Ana Beatriz DePaula-Silva, Tyler J Hanak, Jane E Libbey, Robert S Fujinami Theiler's murine encephalomyelitis virus infection of SJL/J and C57BL/6J mice: Models for multiple sclerosis and epilepsy. J. Neuroimmunol.: 2017; PubMed 28237622

Spleen Development

Stage 13 image 074.jpg The human spleen arises in week 5 within the dorsal mesogastrium as proliferating mesenchyme overlying the dorsal pancreatic endoderm. Cells required for its hemopoietic function arise from the yolk sac wall and near dorsal aorta.

The spleen generates both red and white cells in the 2nd trimester. Note that many embryonic RBCs remain nucleated.

D4 Dorsal Mesogastrium (stage 13)


Links: Spleen Development

Thymus Development

Embryonic thymus The thymus has a key role in the development of an effective immune system as well as an endocrine function.

The thymus has two origins for the lymphoid thymocytes and the thymic epithelial cells. The thymic epithelium begins as two flask-shape endodermal diverticula that form from the third pharyngeal pouch and extend lateralward and backward into the surrounding mesoderm and neural crest-derived mesenchyme in front of the ventral aorta.

D4 Developing Thymus (stage 22)


Links: Thymus Development

Lymph Node Development

Lymph node cartoon

Links: Lymph Node Development


T Lymphocyte Development

A study of cord blood from 19 early second and third trimester fetuses (GA 18-36 weeks) and 16 term newborns (GA 37-42 weeks).[8]

  • Percentage of lymphocytes in fetal white blood cells was 79.3%, reducing to 40% by term birth
    • higher than that of adults.
  • Mononuclear cells (cord blood mononuclear cells (CBMC)
  • fetal mononuclear cells were unable to produce IL-2, IL-4 or IFN-gamma.
  • spontaneously secreted IL-10, IL-6 and TNF-alpha in vitro.
  • fail to respond to mitogen (PHA) or allogeneic stimulation in vitro.
    • Stimulation with PHA up-regulated the production of IL-10, IL-6 and TNF-alpha substantially.
    • CD3+ T cells in fetal (40.1%) and neonatal (42.4%)
    • lower than that of men (59.6%) and pregnant women (53.6%).
  • CD8+ T cells (9.5%)
  • gamma delta - T cells (0.5%)
  • NK cells (4.8%)


Gastrointestinal Tract

Intraepithelial Lymphocytes

Intraepithelial lymphocyte differentiation 02.jpg

Thymic and peripheral differentiation of natural and induced intraepithelial lymphocyte.[9]

See also Intraepithelial lymphocyte differentiation

Peyer's Patches

Peyer's patches appear and are continuously formed from 13.5 weeks (GA 15.5 wk) through to about 36 weeks in the gastrointestinal tract. Then between 15.5 and 20 weeks (GA17.5 wk to 22 wk) they develop the surface markers of lymphocytes in the mucosal immune system of the gut.[10] This developmental change is also occurring within the appendix lymphocyte markers: HLA - DR, CD19 (B cell population), CD9 (pre-B cells), CD3 T lymphocytes, CD4 helper / inducer lymphocytes, the CD8 suppressor / cytotoxic cells and lastly, the CD57 Natural Killer cells.


Other Organs

  • Liver - The adult liver is a lymphoid organ with a predominantly innate immune system. NK cells are abundant in the normal liver (about one-third of intrahepatic lymphocytes), differs from other lymphoid organs and peripheral blood.


Maternal Antibodies

During prenatal development, maternal antibodies are transferred across the placenta to the fetus. Immunoglobulin G (IgG) is transferred across the syncytiotrophoblast cell layer is mediated by the Neonatal Fc receptor (FcRn). Once inside placental villi, immunoglobulins then need to enter fetal circulation by crossing the second cellular endothelial cell layer by an as yet unknown mechanism.

During postnatal development, maternal antibodies are transferred by maternal milk across the neonatal gastrointestinal tract epithelium by the Neonatal Fc receptor (FcRn). (See Neonatal Fc receptor review[11])


Links: Placenta Development | Milk

Additional Images

Histology

The images below are from adult immune Lymph Nodes.

Immune Cells

  • Human natural killer cells (NK) - originate from CD34(+) hematopoietic progenitor cells.


Adult Lymphocyte Histology

Lymphocyte EM Images: T and B Lymphocytes 1 TEM | T and B Lymphocytes 2 TEM | T Lymphocyte SEM | B lymphocyte 1 TEM | B lymphocyte 2 TEM | B lymphocyte 3 TEM | Plasma Cell TEM | T2 Lymphocyte 1 TEM | T2 Lymphocyte 2 TEM | lymphocyte rosettes | T lymphocyte 1 | T lymphocyte 2 | T lymphocyte 3 | T lymphocyte 4 | T lymphocyte 5 | T lymphocyte 6 | B lymphocyte | B lymphocytes TEM | Immune System Development | Blood

Movies

Adult Lymphocyte Motility

Adult Mouse Lymphocyte Motility
Mouse adult lymph node 01.jpg
 ‎‎Lymph Node 1
Page | Play
Mouse adult lymph node 02.jpg
 ‎‎Lymph Node 2
Page | Play
Mouse adult lymph node 03.jpg
 ‎‎Lymph Node 3
Page | Play
Mouse adult lymph node 04.jpg
 ‎‎Lymph Node 4
Page | Play
Transendothelial
migration
T cell zone Medullary sinus Sinus endothelial
barrier
Mouse adult lymph node 05.jpg
 ‎‎Lymph Node 5
Page | Play
Mouse adult lymph node 06.jpg
 ‎‎Lymph Node 6
Page | Play
Mouse adult lymph node 07.jpg
 ‎‎Lymph Node 7
Page | Play
Mouse adult lymph node 08.jpg
 ‎‎Lymph Node 8
Page | Play
Bi-directional traffic Cross the sinus
endothelial barrier
T and B cell motility T and B cell coupling
Mouse Immune Movies: Transendothelial migration | T cell zone | Medullary sinus | Sinus endothelial barrier | Bi-directional traffic | cross the sinus endothelial barrier | T and B cell motility | T and B cell coupling | T cell Elimination | Immune System Development | Mouse Development
Mouse adult thymus 11.jpg
 ‎‎Thymus 1
Page | Play

References

  1. Friedemann Kiefer, Ralf H Adams Lymphatic endothelial differentiation: start out with Sox--carry on with Prox. Genome Biol.: 2008, 9(12);243 PubMed 19138383 | PMC2646268 | Genome Biology
  2. Xianghu Qu, Bin Zhou, H Scott Baldwin Tie1 is required for lymphatic valve and collecting vessel development. Dev. Biol.: 2015; PubMed 25576926
  3. Gabriela D'Amico, Dylan T Jones, Emma Nye, Karen Sapienza, Antoine R Ramjuan, Louise E Reynolds, Stephen D Robinson, Vassiliki Kostourou, Dolores Martinez, Deborah Aubyn, Richard Grose, Gareth J Thomas, Bradley Spencer-Dene, Daniel Zicha, Derek Davies, Victor Tybulewicz, Kairbaan M Hodivala-Dilke Regulation of lymphatic-blood vessel separation by endothelial Rac1. Development: 2009, 136(23);4043-53 PubMed 19906871
  4. G Eberl, M Lochner The development of intestinal lymphoid tissues at the interface of self and microbiota. Mucosal Immunol: 2009, 2(6);478-85 PubMed 19741595
  5. Eva Sanz, Norman Muñoz-A, Jorge Monserrat, Ana Van-Den-Rym, Pedro Escoll, Ismael Ranz, Melchor Alvarez-Mon, Antonio de-la-Hera Ordering human CD34+CD10-CD19+ pre/pro-B-cell and CD19- common lymphoid progenitor stages in two pro-B-cell development pathways. Proc. Natl. Acad. Sci. U.S.A.: 2010, 107(13);5925-30 PubMed 20231472
  6. Akhil Maheshwari, Ashish R Kurundkar, Sadiq S Shaik, David R Kelly, Yolanda Hartman, Wei Zhang, Reed Dimmitt, Shehzad Saeed, David A Randolph, Charles Aprahamian, Geeta Datta, Robin K Ohls Epithelial cells in fetal intestine produce chemerin to recruit macrophages. Am. J. Physiol. Gastrointest. Liver Physiol.: 2009, 297(1);G1-G10 PubMed 19443732
  7. Takashi Satoh, Eiichi Sakurai, Hiroshi Tada, Tomoyuki Masuda Ontogeny of reticular framework of white pulp and marginal zone in human spleen: immunohistochemical studies of fetal spleens from the 17th to 40th week of gestation. Cell Tissue Res.: 2009, 336(2);287-97 PubMed 19255788
  8. Y Zhao, Z-P Dai, P Lv, X-M Gao Phenotypic and functional analysis of human T lymphocytes in early second- and third-trimester fetuses. Clin. Exp. Immunol.: 2002, 129(2);302-8 PubMed 12165087
  9. Hilde Cheroutre, Florence Lambolez, Daniel Mucida The light and dark sides of intestinal intraepithelial lymphocytes. Nat. Rev. Immunol.: 2011, 11(7);445-56 PubMed 21681197 | Nat Rev Immunol.
  10. S A Bhide, K V Wadekar, S A Koushik Peyer's patches are precocious to the appendix in human development. Dev. Immunol.: 2001, 8(2);159-66 PubMed 11589311
  11. <pubmed25601863 </pubmed>| Front Immunol.

Reviews

Cara C Bertozzi, Paul R Hess, Mark L Kahn Platelets: covert regulators of lymphatic development. Arterioscler. Thromb. Vasc. Biol.: 2010, 30(12);2368-71 PubMed 21071706

Hélène Maby-El Hajjami, Tatiana V Petrova Developmental and pathological lymphangiogenesis: from models to human disease. Histochem. Cell Biol.: 2008, 130(6);1063-78 PubMed 18946678

David Zawieja Lymphatic biology and the microcirculation: past, present and future. Microcirculation: 2005, 12(1);141-50 PubMed 15804980

Young-Kwon Hong, Jay W Shin, Michael Detmar Development of the lymphatic vascular system: a mystery unravels. Dev. Dyn.: 2004, 231(3);462-73 PubMed 15376314

Reina E Mebius Organogenesis of lymphoid tissues. Nat. Rev. Immunol.: 2003, 3(4);292-303 PubMed 12669020


Articles

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Terms

Immune Development

  • adenoid - (Greek " +-oeides = in form of) in the form of a gland, glandular; the pharyngeal tonsil.
  • afferent lymph - vessel carrying lymph towards a node.
  • acquired immune deficiency syndrome - (AIDS) note this is now better described as "advanced HIV disease", decrease in the number of CD4 T cells. (More? Immunobiology - AIDS)
  • anastomose - joining of two tubes or structures together.
  • Antibody mediated immunity - the immune function of plasma cells (active B lymphocytes) secreting antibody which binds antigen.
  • antibodies - mammals have five classes (IgA, IgD, IgE, IgG, and IgM)
  • antigen - any substance that is recognised by the immune system and stimulates antibody production.
  • appendix - is a gut-associated lymphoid tissue (GALT) located at the beginning of the colon. The anatomy is as a finger-like structure that arises from the cecum. The length (2.5-13 cm) is longer in both infants and children and also has more abundant lymphatic tissue in early life. The wall structure is similar to the small intestine (though with no villi), nor plicae circularis. Lymph nodules surround the lumen of the gastrointestinal tract and extend from the mucosa into the submucosa.
  • B cell - (B-cell, B lymphocyte) historically named after a structure called the bursa of Fabricius in birds, a source of antibody-producing lymphocytes. These immune cells develop in the bone marrow. (More? Electron micrographs of nonactivate and activated lymphocytes)
  • B lymphocyte - (B cell, B-cell)
  • BALT - (Bronchus Associated Lymphoid Tissue) immune tissue associated with the respiratory tract.
  • band cell - (band neutrophil or stab cell) seen in bone marrow smear, a cell undergoing granulopoiesis, derived from a metamyelocyte, and leading to a mature granulocyte. Also occasionally seen in circulating blood.
  • cecum - (caecum, Latin, caecus = "blind") within the gastrointestinal tract a pouch that connects the ileum with the ascending colon of the large intestine.
  • cell - has a specific cell biology definition, but is often used instead of "lymphocyte" when describing B and T cells.
  • cell-mediated immunity - the immune function of T lymphocytes. (More? Immunobiology - T Cell-Mediated Immunity)
  • central tolerance - in thymus mediated by cortical epithelial cells, medullary epithelial cells and thymic DCs, involves deletion of self reactive thymocytes (T cell).
  • "clockface" - a term used to describe the appearance of plasma cell nuclei due to the clumping of the chromatin at the nucleus periphery. More clearly seen in tissue plasma cells that the bone marrow smear, where they are sometimes confused with the basophilic erythroblasts. Image - plasma cell
  • CD - (cluster of differentiation) identifies immunological surface markers on cells.
  • CD4+ - (T helper cells) refers to T lymphocytes that express CD4 (glycoprotein of the immunoglobulin superfamily) on their surface. These cells can be infected by human immunodeficiency virus (HIV).
  • CD8+ - (cytotoxic T cells) refers to T lymphocytes that express CD8 (glycoprotein of the immunoglobulin superfamily) on their surface.
  • "clockface" - a term used to describe the appearance of plasma cell nuclei due to the clumping of the chromatin at the nucleus periphery. More clearly seen in tissue plasma cells that the bone marrow smear, where they are sometimes confused with the basophilic erythroblasts.
  • cords of Billroth - spleen cellular columns located in red pulp. surrounded by splenic sinusoids. Cords contain reticular cells, macrophages, lymphocytes, plasma cells and erythrocytes.
  • cortex - outer layer, used in association with medulla (innner layer or core) a general description that can be applied to describing an organ with a layered structure.
  • dendritic cell - (DC, antigen-presenting cell, APC) cells that present antigens and induce a primary immune response in resting naïve T lymphocytes. Originate from the same common progenitor as monocytes (PMID 20193011). In 2011 Ralph M. Steinman received half the Nobel Prize half of the award to to Ralph M. Steinman for his discovery of the dendritic cell and its role in adaptive immunity.
  • Effector cells - the immune functioning (active) B and T lymphocytes.
  • Efferent lymph - vessel carrying lymph away from a node.
  • fibroblastic reticular cell - (FRC) specialized myofibroblasts that form the structural mesenchymal network "sponge" within lymphoid tissue, through which T cells, B cells, dendritic cells (DCs), plasma cells and macrophages move and interact.
  • GALT - Gut Associated Lymphatic Tissue consisting of Peyer’s patches, isolated lymphoid follicles and mesenteric lymph nodes.
  • haemopoiesis (hemopoiesis) formation of blood cells.
  • Hassall's corpuscle - thymic corpuscle.
  • high endothelial venule - (HEV) the specialised post-capillary venous region that enables blood lymphocytes to enter a lymph node. These specialised post-capillary venules enables blood lymphocytes to enter a lymph node. Their endothelial cells express ligands that bind lymphocytes, aiding their adhesion and subsequent transmigration into the lymph node.
  • humoral immune response - production of antibody by plasma cells derived from B lymphocytes (B cells).
  • IEL - Intraepithelial Lymphocyte are T lymphocytes located in the gastrointestinal tract epithelium. Natural IELs (previously ‘type b’ IELs) acquire activated phenotype during development in the thymus in the presence of self antigens. Induced IELs (previously ‘type a’ IELs) progeny of conventional T cells activated post-thymically in response to peripheral antigens.
  • IgA - the main class of antibody in secretions (saliva, tears, milk, and respiratory and intestinal secretions).
  • IgD - the immunoglobulin B cell starts to produce as a cell-surface molecule after leaving the bone marrow.
  • IgE - bind Fc receptors (surface of mast cells in tissues and basophils in the blood) release of potent pro inflammatory molecules mediators of allergic reactions.
  • IgG - the major class of immunoglobulin in the blood.
  • IgM - the first class of antibody made by a developing B cell, which may switch to making other classes of antibody.
  • immunodeficiency - when one or more components of the immune system is defective. (More? Immunobiology - immunodeficiency)
  • immunoglobulin - (antibody, Ab) protein produced by plasma cells.
  • intraepithelial lymphocyte (IEL) immune cells residing in the gastrointestinal tract epithelium. image - Intraepithelial lymphocyte differentiation
  • involution - in the thymus refers to the replacement, mainly in the cortex, of cells by adipose tissue. (More? PubMed- thymus involution) | Cancer Medicine - Thymomas and Thymic Tumors)
  • Kupffer cells - stellate macrophage cells located in the liver sinusoids, named after Karl Wilhelm von Kupffer (1829 - 1902) a German anatomist who originally identified these cells. (More? Liver Development)
  • lacteal - term used to describe the lymphatic vessels of the small intestine.
  • lamina propria - a layer of loose connective tissue found underneath an epithelium, together with the epithelium described as mucosa.
  • Langerhans cell - (LC, dendritic cell) Antigen-presenting immune cell found mainly in the basal/suprabasal layers of adult skin and mucosa. Cells lie in the basal/suprabasal layers of stratified epidermal and mucosal tissues. First in the innate antiviral immune defines and can migrate to lymph nodes and induce a T cell–mediated adaptive immune response. (More? Integumentary | Immune System Development)
  • Leukocyte - (Greek, lukos = clear, white) white blood cell.
  • lingual - related to the tongue.
  • lymph node - connective tissue encapsulated lymphoid organ (1mm - 2cm in size), positioned in the pathway of lymph vessels. (More? Lymph Node Development)
  • lymphangion - the functional unit of a lymph vessel that lies between two semilunar (half moon-shaped) valves.
  • M cell - (microfold cell) found in the follicle-associated epithelium of the Peyer's patch. Function to transport gut lumen organisms and particles to immune cells across the epithelial barrier.
  • macrophage - a large highly motile white blood cell which engulfs foreign material (bacteria etc) and both degenerating cells and cell fragments. Differentiates from a monocyte and found in many different tissues and locations. Current theory suggests tissue macrophage is also derived from resident stem cell population in many tissues. More? Immunobiology - Defects in phagocytic cells are associated with persistence of bacterial infection)
  • MALT - Mucosa Associated Lymphoid Tissue
  • medulla - inner layer or core, used in association with cortex (outer layer) a general description that can be applied to describing an organ with a layered structure.
  • Memory Cell - effector T cell (lymphocyte)
  • mesenteric lymph nodes - Part of GALT as well as being involved in gut-draining. image - mesenteric lymph nodes
  • Mononuclear Phagocytic System - (MPS, Lymphoreticular System, Reticuloendothelial System, RES) Consists of circulating monocytes in the peripheral blood and non-circulating (fixed) tissue macrophages (MΦ) located in tissues and organs.
  • negative selection - T cells bearing autoreactive T cell antigen receptors (TCRs) are eliminated during their development in the thymus, protects against autoimmunity.
  • normoblast - seen in bone marrow smear, a developing erythroblast (red blood cell) that still retains a nucleus.
  • nude mice - (nu/nu) mice which are congenitally hairless and athymic, therefore they do not reject tissue and tumor grafts.
  • parenchyma - (Greek = enkeim "to pour in") cells forming the functional cells of an organ or tissue. These cells carry out the function of the organ at a cellular level, and are not the structural cells, connective tissue, extracellular matrix (stromal).
  • periarterial lymphoid sheath - (PALS) in the spleen the white pulp that surrounds the central arteries. (T-lymphocytes,macrophages and plasma cells)
  • Plasma Cell - active B cell (lymphocyte) which is secreting antibody. Located in either bone marrow or peripheral lymphoid tissues, these cells have and increased cytoplasmic volume (due to increase rough endoplasmic reticulum) in comparison to the inactive (non-secreting) lymphocyte.
  • red pulp - spleen region, organized as cell cords (splenic cords, cords of Billroth) and vascular sinuses.
  • regulatory T cells - (Tregs) maintain self tolerance and suppress pathological immune responses by control of immune response to non-self antigens.
  • sentinel lymph node - the hypothetical first lymph node or group of nodes reached by metastasizing cancer cells from a primary tumour.
  • splenic sinusoids - enlarged spleen capillary spaces located in red pulp and surrounding cords of Billroth.
  • stroma - (Greek = "a cover, table-cloth, bedding") tissue forming the framework/support of an organ or tissue. That is the structural cells which form connective tissue and secrete extracellular matrix, rather than the functional cells (parenchymal). All organs can therefore be functionally divided into these 2 components, stromal/parenchymal.
  • Subcapsular sinus (=marginal sinus) space lying under the connective tissue capsule which receives lymph from afferent lymphatic vessels.
  • T cell - (T-cell, T lymphocyte) named after thymus, where they develop, the active cell is responsible for cell-mediated immunity (killer T cells and helper T cells). Cells express T-cell receptor on surface and directly kill virally or bacterially infected cells. These cells can themselves be infected by HIV. (More? Electron micrographs of nonactivate and activated lymphocytes)
  • T cell activation - (T lymphocyte activation)The activation process begins with T-cells searching for and encountering antigen-bearing dendritic cells within lymph nodes.
  • Thymic corpuscle (=Hassall's corpuscle) a mass of concentric epithelioreticular cells found in the thymus. The number present and size tend to increase with thymus age. (see classical description of Hammar, J. A. 1903 Zur Histogenese und Involution der Thymusdriise. Anat. Anz., 27: 1909 Fiinfzig Jahre Thymusforschung. Ergebn. Anat. Entwickl-gesch. 19: 1-274.)
  • thymic epitheliocytes - reticular cells located in the thymus cortex that ensheathe the cortical capillaries, creating and maintain the microenvironment necessary for the development of T-lymphocytes in the cortex.
  • T helper cells - (helper T-cells) (Th cells, CD4+) refers to T lymphocytes that when mature express CD4 (glycoprotein of the immunoglobulin superfamily) on their surface.
  • T lymphocyte - (T cell, T-cell).
  • thymus - an immune/endocrine (thymic hormone) organ involved in the maturation of T lymphocytes (T-cells). Thymus Development
  • tonsils - lymph nodules embedded in the mucus membranes located at the back of the mouth and top of the throat. The overlying epithelium helps identify the location.
  • vermiform appendix - see appendix, anatomical region containing gut-associated lymphoid tissue located within the gastrointestinal tract at the beginning of the colon. The anatomy is as a finger-like structure that arises from the cecum. The length (2.5-13 cm) is longer in both infants and children and also has more abundant lymphatic tissue in early life. The wall structure is similar to the small intestine (though with no villi), nor plicae circularis. Lymph nodules surround the lumen of the gastrointestinal tract and extend from the mucosa into the submucosa.
  • VDJ recombination - (variable, diversity and joining gene segments) genetic recombination event that occurs in immune cell maturation in primary lymphoid organs, B cells ((bone marrow) and T cells (thymus).
  • white pulp - (Malpighian bodies of the spleen, splenic lymphoid nodules) spleen lymphoid region, organized as lymphoid sheaths with both T-cell and B-cell compartments, around the branching arterial vessels (resembles lymph node structure).
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Cite this page: Hill, M.A. 2017 Embryology Immune System Development. Retrieved February 28, 2017, from https://embryology.med.unsw.edu.au/embryology/index.php/Immune_System_Development

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