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Complement deficiency is an immunodeficiency of absent or suboptimal functioning of one of the complement system proteins. [4] Because of redundancies in the immune system , many complement disorders are never diagnosed.
Complement 4 deficiency; Specialty: Immunology: Complement tests C4 FB C3 CH50 ... 4 deficiency is a genetic condition affecting complement component 4. [1]
Complement component 5 is a protein that in humans is encoded by the C5 gene. [5] Complement component 5 is involved in the complement system. It is cleaved into C5a and C5b: C5a plays an important role in chemotaxis. [6] C5b forms the first part of the complement membrane attack complex. Deficiency is thought to cause Leiner's disease.
Complement component 4 (C4), in humans, is a protein involved in the intricate complement system, originating from the human leukocyte antigen (HLA) system. It serves a number of critical functions in immunity, tolerance, and autoimmunity with the other numerous components.
Lack of regulation of the classical complement pathway through the deficiency in C1-inhibitor results in episodic angioedema. [1] C1-inhibitor defiency can be hereditary or acquired, resulting in hereditary or acquired angioedema. [12] C1-inhibitor plays the role of inactivating C1r and C1s to prevent further downstream classical complement ...
Terminal complement pathway deficiency is a genetic condition affecting the complement membrane attack complex (MAC). It involves deficiencies of C5, C6, C7, and C8. (While C9 is part of the MAC, and deficiencies have been identified, [1] it is not required for cell lysis. [2]) People with this condition are prone to meningococcal infection. [3]
Structure of mannose in its α-D mannopyranose form. Mannan is a polymer of mannose.. The lectin pathway or MBL pathway is a type of cascade reaction in the complement system, similar in structure to the classical complement pathway, [1] in that, after activation, it proceeds through the action of C4 and C2 to produce activated complement proteins further down the cascade.
The trimer provides a surface for interaction between the antigen-antibody complex and other complement components. The alpha chain may be cleaved to release C4 anaphylatoxin, a mediator of local inflammation. Deficiency of this protein is associated with systemic lupus erythematosus and type I diabetes mellitus.