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thymus

  (thī'məs) pronunciation
n., pl. -mus·es.

A small glandular organ that is situated behind the top of the breastbone, consisting mainly of lymphatic tissue and serving as the site of T cell differentiation. The thymus increases gradually in size and activity until puberty, becoming vestigial thereafter.

[New Latin, from Greek thumos, warty excrescence, thymus.]


 
 
Sci-Tech Encyclopedia: Thymus gland

An important central lymphoid organ in the neck or upper thorax of all vertebrates from elasmobranchs to mammals. The thymus gland is most prominent during early life. In many laboratory species of mammals and in humans it reaches its greatest relative weight at the time of birth, but its absolute weight continues to increase until the onset of puberty. Thereafter, it begins to undergo an involution and progressively decreases in size throughout adult life.

The thymic stem cells generate a large population of small lymphocytes (thymocytes) through a series of mitotic divisions. Simultaneously these dividing lymphocytes show evidence of cellular differentiation within the special thymic environment. During this division and maturation phase the developing thymocytes undergo an intrathymic migration from the peripheral cortical area to the medullary core of the organ. Some thymocytes degenerate within the organ, but many enter the circulating blood and lymph systems at various stages of maturity. A small percentage of the T lymphocyte population (5–10%) within the thymus is antigenically competent and capable of recognizing antigenic determinents on foreign cells or substances. Some of the T lymphocytes have the capacity to lyse the foreign tissue cells, while others are involved in recognizing the “foreignness” of the antigens and assisting a second sub-population of bone-marrow-derived lymphocytes (B lymphocytes) to respond to the antigen by producing a specific antibody. These two types of immunocompetent T lymphocytes are called killer cells and helper cells, respectively. They are involved in both tissue transplantation and humoral antibody responses. On the other hand, the vast majority of the thymic lymphocytes are immunologically incompetent (90–95%). Some thymocytes are thought to give rise to the smaller pool of immunocompetent T lymphocytes, but many emigrate into the circulating blood. See also Cellular immunology; Lymphatic system; Thymosin.


 

Chest (neck) sweetbread; a ductless gland in the chest, as distinct from gut sweetbread or pancreas.

 

Pyramid-shaped lymphoid organ (see lymphoid tissue) between the breastbone and the heart. Starting at puberty, it shrinks slowly. It has no lymphatic vessels draining into it and does not filter lymph; instead, stem cells in its outer cortex develop into different kinds of T cells (see lymphocytes). Some migrate to the inner medulla and enter the bloodstream; those that do not may be destroyed to prevent autoimmune reactions. This process is most active during infancy. If a newborn's thymus is removed, not enough T cells are produced, the spleen and lymph nodes have little tissue, and the immune system fails, causing a gradual, fatal wasting disease. Thymus removal in adults has little effect.

For more information on thymus, visit Britannica.com.

 
Columbia Encyclopedia: thymus gland
(thī'məs) , mass of glandular tissue located in the neck or chest of most vertebrate animals. In humans, the thymus is a soft, flattened, pinkish-gray organ located in the upper chest under the breastbone. It is relatively large in the newborn infant (about the size of the baby's fist), and continues to grow throughout childhood up to the age of puberty when it weighs about 1.2 oz (35 grams). Then it gradually decreases in size until it blends in with the surrounding tissue. The functions of the thymus were not well understood until the early 1960s, when its role in the development of the body's system of immunity was discovered. Beginning during fetal development, the thymus processes many of the body's lymphocytes, which migrate throughout the body via the bloodstream, seeding lymph nodes and other lymphatic tissue. The main cells undergoing this processing are the T cells, a heterogeneous groups of cells essential in protecting the body against invasions by foreign organisms (see immunity). If the thymus fails to develop or is removed early in fetal life, the immune system cannot develop completely. Normally, by the time the infant is a few months old, the immune system has sufficiently formed so as to function throughout life. However, further growth and development of lymphoid tissue still depends on intervention by the thymic cells. After the initial seeding process, the thymus releases a hormonal substance that stimulates further growth of lymphoidal tissue, although such a substance has not yet been isolated.


 
Health Dictionary: thymus gland
(theye-muhs)

A gland located behind the breastbone that functions in the development of the immune system. The thymus is large in infancy and early childhood but begins to atrophy between ages eight and ten.

 

A primary lymphoid organ lying in the cranial mediastinum or in the neck or throat, (depending on the species), which reaches its maximum development during puberty and continues to play an immunological role throughout life, even though its function declines with age. Called also sweetbread.
During the last stages of fetal life and the early neonatal period, the reticular structure of the thymus entraps immature ‘stem’ cells arising from the bone marrow and circulating in the blood. The thymus preprocesses these cells, causing them to become antigen-specific and therefore capable of maturing into a type of lymphocyte that is essential to the regulation of immune responses generally and the development of cell-mediated immunity. More than 90% of T lymphocytes produced in the thymus are destroyed there in a process sometimes referred to as clonal purging, which is conceptually associated with the removal of self-reactive cells, i.e. only nonself-reactive cells leave the thymus. After development in the thymus, these lymphocytes re-enter the blood and are transported to developing secondary lymphoid tissues, such as lymph nodes and spleen, where they seed the cells that eventually become thymus-dependent or T lymphocytes. If the thymus is removed or becomes nonfunctional during fetal life, the secondary lymphoid tissue and blood fail to become seeded with the T lymphocytes and the body's cell-mediated arm of immunity fails to develop. It is this arm of immunity that is mainly responsible for rejection of organ transplants and resistance to microbial infection, and plays a role in the elimination of cells potentially able to give rise to cancer.

  • t. atrophy — leads to failure of the cell-mediated arm of the body's immunity.
 

The botanical name for thyme.

 
Wikipedia: thymus
Thymus
Illu_thymus.jpg
Thymus
Gray1178.png
The thymus of a full-term fetus, exposed in situ.
Gray's subject #274 1273
Artery derived from internal mammary artery, superior thyroid artery, and inferior thyroid artery
Nerve vagus
Precursor third branchial pouch
MeSH Thymus+gland
Dorlands/Elsevier t_10/12807749
This article discusses the bodily organ. For the herb genus Thymus, see Thyme.

In human anatomy, the thymus is an organ located in the upper anterior portion of the chest cavity just behind the sternum. Hormones produced by this organ stimulate the production of certain infection-fighting cells. It is of central importance in the maturation of T cells.

History

Due to the large numbers of apoptotic lymphocytes, the thymus was originally dismissed as a "lymphocyte graveyard", without functional importance. The importance of the thymus in the immune system was discovered in 1961 by Jacques Miller, by surgically removing the thymus from three day old mice, and observing the subsequent deficiency in a lymphocyte population, subsequently named T cells after the organ of their origin. [1] Recently advances in immunology have allowed the fine dissection of the function of the thymus in T cell maturation.

Function

In the two thymic lobes, lymphocyte precursors from the bone-marrow become thymocytes, and subsequently mature into T cells. Once mature, T cells emigrate from the thymus and constitute the peripheral T cell repertoire responsible for directing many facets of the adaptive immune system. Loss of the thymus at an early age through genetic mutation or surgical removal results in severe immunodeficiency and a high susceptibility to infection. [2]. The ability of T cells to recognize foreign antigens is mediated by the T cell receptor. The T cell receptor undergoes genetic rearrangement during thymocyte maturation, resulting in each T cell bearing a unique T cell receptor, specific to a limited set of peptide:MHC combinations. The random nature of the genetic rearrangement results in a requirement of central tolerance mechanisms to remove or inactivate those T cells which bear a T cell receptor with the ability to recognise self-peptides.

Phases of thymocyte maturation

The generation of T cells expressing distinct T cell receptors occurs within the thymus, and can be conceptually divided into three phases:

  • A rare population of hematopoietic progenitors enters the thymus from the blood, and expands by cell division to generate a large population of immature thymocytes[3].
  • Immature thymocytes each make distinct T cell receptors by a process of gene rearrangement. This process is error-prone, and some thymocytes fail to make functional T cell receptors, whereas other thymocytes make T cell receptors that are autoreactive. [4]. Growth factors include thymopoietin and thymosin.
  • Immature thymocytes undergo a process of selection, based on the specificity of their T cell receptors. This involves selection of T cells that are functional (positive selection), and elimination of T cells that are autoreactive (negative selection).
type: functional (positive selection) autoreactive (negative selection)
location: cortex medulla
Intrathymic_T_Cell_Differentiation.JPG

In order to be positively-selected, thymocytes will have to interact with several cell surface molecules, MHC/HLA, to ensure reactivity and specificity[5].

Positive selection eliminates (apoptosis) weak binding cells and only takes high medium binding cells. (Binding refers to the ability of the T-cell receptors to bind to either MHC class I/II or peptide molecules.)

Negative selection is not 100% complete. Some autoreactive T cells escape thymic censorship, and are released into the circulation.

Additional mechanisms of tolerance active in the periphery exist to silence these cells such as anergy, deletion, and regulatory T cells.

If these central tolerance mechanisms also fail, autoimmunity may arise.

Cells that pass both levels of selection are released into the bloodstream to perform vital immune functions.

Anatomy

The thymus is of a pinkish-gray color, soft, and lobulated on its surfaces. At birth it is about 5 cm in length, 4 cm in breadth, and about 6 mm in thickness. The organ enlarges during childhood, and atrophies at puberty.

The thymus will, if examined when its growth is most active, be found to consist of two lateral lobes placed in close contact along the middle line, situated partly in the thorax, partly in the neck, and extending from the fourth costal cartilage upward, as high as the lower border of the thyroid gland.

It is covered by the sternum, and by the origins of the sternohyoidei and sternothyreoidei.

Below, it rests upon the pericardium, being separated from the aortic arch and great vessels by a layer of fascia.

In the neck, it lies on the front and sides of the trachea, behind the sternohyoidei and sternothyreoidei.

The two lobes generally differ in size; they are occasionally united, so as to form a single mass, and sometimes separated by an intermediate lobe.

Development

Embryology

The two main components of the thymus, the lymphoid thymocytes and the thymic epithelial cells, have distinct developmental origins. The thymic epithelium is the first to develop, and appears in the form of two flask-shape endodermal diverticula, which arise, one on either side, from the third branchial pouch (pharyngeal pouch), and extend lateralward and backward into the surrounding mesoderm and neural crest-derived mesenchyme in front of the ventral aorta.

Here they meet and become joined to one another by connective tissue, but there is never any fusion of the thymus tissue proper. The pharyngeal opening of each diverticulum is soon obliterated, but the neck of the flask persists for some time as a cellular cord. By further proliferation of the cells lining the flask, buds of cells are formed, which become surrounded and isolated by the invading mesoderm. Additional portions of thymus tissue are sometimes developed from the fourth branchial pouches. [6]

During the late stages of the development of the thymic epithelium, hematopoietic lymphoid cells from bone-marrow precursors immigrate into the thymus and are aggregated to form lymphoid follicles.

The thymus continues to grow between birth and puberty and then begins to atrophy, a process directed by the high levels of circulating sex hormones. Proportional to thymic size, thymic activity (T cell output) is most active before puberty. Upon atrophy, the size and activity are dramatically reduced, and the organ is primarily replaced with fat (a phenomenon known as "involution"). The atrophy is due to the increased circulating level of sex hormones, and chemical or physical castration of an adult results in the thymus increasing in size and activity. [7] Patients with the autoimmune disease Myasthenia gravis commonly (70%) are found to have thymic hyperplasia or malignancy.[8] The reason or order of these cirumstances has yet to be determined by medical scientists.

Age Grams
birth about 15 grams;
puberty about 35 grams
twenty-five years 25 grams
sixty years less than 15 grams
seventy years about 0 grams

Structure

Histology
Enlarge
Histology
Minute structure of thymus.
Enlarge
Minute structure of thymus.

Each lateral lobe is composed of numerous lobules held together by delicate areolar tissue; the entire organ being enclosed in an investing capsule[9] of a similar but denser structure. The primary lobules vary in size from that of a pin's head to that of a small pea, and are made up of a number of small nodules or follicles.

The follicles are irregular in shape and are more or less fused together, especially toward the interior of the organ. Each follicle is from 1 to 2 mm in diameter and consists of a medullary and a cortical portion[10], and these differ in many essential particulars from each other.

Cortex

The cortical portion is mainly composed of lymphoid cells, supported by a network of finely-branched epithelial reticular cells, which is continuous with a similar network in the medullary portion. This network forms an adventitia to the blood vessels.

The cortex is the location of the earliest events in thymocyte development, where T cell receptor gene rearrangement and positive selection takes place.

Medulla

In the medullary portion, the reticulum is coarser than in the cortex, the lymphoid cells are relatively fewer in number, and there are found peculiar nest-like bodies, the concentric corpuscles of Hassall.[11] These concentric corpuscles are composed of a central mass, consisting of one or more granular cells, and of a capsule formed of epithelioid cells. They are the remains of the epithelial tubes, which grow out from the third branchial pouches of the embryo to form the thymus. Each follicle is surrounded by a vascular plexus, from which vessels pass into the interior, and radiate from the periphery toward the center, forming a second zone just within the margin of the medullary portion. In the center of the medullary portion there are very few vessels, and they are of minute size.

The medulla is the location of the latter events in thymocyte development. Thymocytes that reach the medulla have already successfully undergone T cell receptor gene rearrangement and positive selection, and have been exposed to a limited degree of negative selection. The medulla is specialised to allow thymocytes to undergo additional rounds of negative selection to remove auto-reactive T cells from the mature repertoire. The gene AIRE is expressed in the medulla, and drives the transcription of organ-specific genes such as insulin to allow maturing thymocytes to be exposed to a more complex set of self-antigens than is present in the cortex.

Vasculature

The arteries supplying the thymus are derived from the internal mammary, and from the superior thyroid and inferior thyroids.

The veins end in the left innominate vein, and in the thyroid veins.

The nerves are exceedingly minute; they are derived from the vagi and sympathetic nervous system. Branches from the descendens hypoglossi and phrenic reach the investing capsule, but do not penetrate into the substance of the organ.

Cancer

Two primary forms of tumours originate in the thymus.

Tumours originating from the thymic epithelial cells are called thymomas, and are found in about 25-50% of patients with myasthenia gravis. Symptoms are sometimes confused with bronchitis or a strong cough because the tumor presses on the cough nerve. All thymomas are potentially cancerous, but they can vary a great deal. Some grow very slowly. Others grow rapidly and can spread to surrounding tissues. Treatment of thymomas often requires surgery to remove the entire thymus.

Tumours originating from the thymocytes are called thymic lymphomas.

Other animals and second thymus

The thymus is also present in most vertebrates, with similar structure and function as the human thymus. Some animals have multiple secondary (smaller) thymi in the neck, this phenomenon has been reported for mice [12] and also occurs in 5 out of 6 human fetuses.[13] As in humans, the Guinea pig's thymus naturally atrophies as the animal reaches adulthood, but in the hairless "Skinny pig" breed (which arose from a spontaneous laboratory mutation) it often possesses no thymic tissue whatsoever, and the organ cavity is replaced with cystic spaces.

When animal thymic tissue is sold in a butcher shop or at a meat counter, thymus is known as sweetbread.

References

  1. ^ Miller JF. Events that led to the discovery of T-cell development and function--a personal recollection. Tissue Antigens. 2004 Jun;63(6):509-17. full text
  2. ^ Miller JF. The discovery of thymus function and of thymus-derived lymphocytes. Immunol Rev 185:7-14, 2002. full text
  3. ^ Schwarz BA, Bhandoola A. Trafficking from the bone marrow to the thymus: a prerequisite for thymopoiesis. Immunol Rev 209:47, 2006. full text
  4. ^ Sleckman BP, Lymphocyte antigen receptor gene assembly: multiple layers of regulation. Immunol Res 32:153-8, 2005. full text
  5. ^ Baldwin TA, Hogquist KA, Jameson SC, The fourth way? Harnessing aggressive tendencies in the thymus. “J Immunol.” 173:6515-20, 2004. http://www.jimmunol.org/cgi/content/full/173/11/6515]
  6. ^ Swiss embryology (from UL, UB, and UF) qblood/lymphat03
  7. ^ Sutherland JS. Activation of thymic regeneration in mice and humans following androgen blockade. J Immunol 2005 15;175(4):2741-53
  8. ^ Kumar, Parveen, Michael Clark (2002). Clinical Medicine 5th edn.. Saunders, 1222. ISBN 0-702-02606-9. 
  9. ^ Histology at BU 07403loa
  10. ^ Histology at BU 07401loa
  11. ^ Histology at USC lymp/c_61
  12. ^ Terszowski G et al. (2006) Evidence for a Functional Second Thymus in Mice. Science. 2 March 2006. PMID 16513945
  13. ^ Surprise organ discovered in mice, Nature News, 2 March 2006

External links

Additional images

This article incorporates text or images from the public domain Gray's Anatomy, Lea & Febiger, 1917 edition.


 
 

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