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Update in Endocrine Autoimmunity
Update in Endocrine Autoimmunity

... new mechanistic insights to immune tolerance is immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX). This is an X-linked disorder that is characterized by a severe autoimmunity syndrome in which most affected subjects usually die before the age of 2 yr if they do not receive bone ...
Septic Shock
Septic Shock

... • XLA is caused by mutations in the Btk gene, located on chromosome Xq 21.3-22 • autosomal recessive - caused by abnormalities in the mu-chain gene that codes for the heavy chain of IgM or the Bcell linker protein ...
Septic Shock
Septic Shock

... • XLA is caused by mutations in the Btk gene, located on chromosome Xq 21.3-22 • autosomal recessive - caused by abnormalities in the mu-chain gene that codes for the heavy chain of IgM or the Bcell linker protein ...
Adaptive immunity
Adaptive immunity

... Because of tolerance: central and peripheral. ...
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Cells of the Immune Response

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Autoimmunity, T-cells and STAT-4 in the pathogenesis of chronic EDITORIAL M.G. Cosio
Autoimmunity, T-cells and STAT-4 in the pathogenesis of chronic EDITORIAL M.G. Cosio

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Return to Table of Contents
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Types of Immunity
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...  multiple allergies  autoimmune diseases present  adults more than children Immediate localized hypersensitivity is managed with antihistamines, whereas delayed hypersensitivity is best treated with corticosteroids. Autoimmune Diseases: In autoimmune diseases (connective tissue diseases) certain ...
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Thymic Selection of T-Cell Receptors as an Extreme Value Problem

... Letter, we show that the model can be solved exactly in the limit of long TCR-peptide sequences. The resulting analytic expression for the amino acid composition of selected TCRs is surprisingly accurate even for short peptides and provides a theoretical basis for previous numerical results. Further ...
The hygiene hypothesis revisited
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Thymus gland Bone marrow Secondary organs of immune system

... •as well as killing off the harmful bacteria causing the infection, •some of the good resident microbes will die, leaving an opportunity for others to grow. ...
Lymphatic System - Downey Unified School District
Lymphatic System - Downey Unified School District

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Lymphatic System - Dr. Salah A. Martin
Lymphatic System - Dr. Salah A. Martin

... another by desmosomes. The reticular cells of the thymus are of epithelial origin. In particular, they develop from the endoderm. They reflect their epithelial origins in their secretory nature. They produce a variety of peptide hormones most of which regulate T cell development and maturation. Thes ...
Lymphatic System and Immunity
Lymphatic System and Immunity

...  Fine reticular fiber network that holds lymphocytes in place and traps microorganisms ...
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... reactive T-lymphocytes) or products (autoantibodies) of own constituent parts (down to the submolecular levels) the immune system against the organism’s own antigens as ‘self’, which results in an immune response against (autoantigen). It may be part of the physiological immune its own cells and tis ...
Chapter 13
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... – Cytotoxic T cells destroy nonself protein-bearing cells – Helper T cells secrete cytokines that control the immune response ...
The Lymphatic and Immune Systems
The Lymphatic and Immune Systems

... ofLymphatic the Lymphatic Spleen Thymus Gland -largest lymphatic organ -located in upper left portion of the abdominal cavity -filters foreign material from the blood -destroys old red blood cells -activates ...
8-9-TCRs and T-cells
8-9-TCRs and T-cells

... How does ‘negative selection’ for self-tolerance occur? Testing for high affinity for Self-antigens -- expression of AIRE (autoimmune regulator gene) ...
and t-lymphocyte immune deficiencies
and t-lymphocyte immune deficiencies

... infections, particularly of the respiratory and gastrointestinal tract  The most common causative organisms are bacteria such as S. pneumoniae and H. influenza  Severe inherited disorders of antibody production are rare  usually present at 5-6 months of age, when the protective benefit of transfe ...
Unit VI: Immunity and Diseases
Unit VI: Immunity and Diseases

... III. The immune system is our body’s defense against foreign agents such as bacteria and viruses IV. The organs of the immune system are positioned throughout the body. (these organs are also called lymphoid organs because they are home to lymphocytes—types of white blood cells) A. Primary organs (w ...
Headache and The Immune System
Headache and The Immune System

... complicated latticework of different parts, some of which directly attack foreign invaders, and others which regulate the attacking cells. Recent research indicates that the immune system is involved in many illnesses, including headache. Pure immune diseases include lupus and rheumatoid arthritis. ...
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Thymus



The thymus is a specialized primary lymphoid organ of the immune system. Within the thymus, T cells or T lymphocytes mature. T cells are critical to the adaptive immune system, where the body adapts specifically to foreign invaders. The thymus is composed of two identical lobes and is located anatomically in the anterior superior mediastinum, in front of the heart and behind the sternum. Histologically, each lobe of the thymus can be divided into a central medulla and a peripheral cortex which is surrounded by an outer capsule. The cortex and medulla play different roles in the development of T-cells. Cells in the thymus can be divided into thymic stromal cells and cells of hematopoietic origin (derived from bone marrow resident hematopoietic stem cells). Developing T-cells are referred to as thymocytes and are of hematopoietic origin. Stromal cells include epithelial cells of the thymic cortex and medulla, and dendritic cells.The thymus provides an inductive environment for development of T cells from hematopoietic progenitor cells. In addition, thymic stromal cells allow for the selection of a functional and self-tolerant T cell repertoire. Therefore, one of the most important roles of the thymus is the induction of central tolerance.The thymus is largest and most active during the neonatal and pre-adolescent periods. By the early teens, the thymus begins to atrophy and thymic stroma is mostly replaced by adipose (fat) tissue. Nevertheless, residual T lymphopoiesis continues throughout adult life.
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