Wednesday, December 7, 2016

Complement Activation

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  1. Classical pathway: Is considered part of the adaptive immune response since it begins with the formation of Ag: Ab complexes. These complexes are soluble found in antibodies that bind to an epitope, situated for bacterial or viral cell membranes. Soluble Ag:Ab complexes are referred to as immune complexes and only these complexes are formed by IgM or certain subclasses of IgG-abs are capable of activating the classical complement pathway. Th initial stage of activation involves the components C1, C2, C3, and C4, which are present in the plasma as zymogens. 
  2. Phosphatidyl serine: The phospholipid restricted to the cytoplasmic side of the membrane, and the change in its location serves to signal the immune system that the cell is undergoing apoptosis. 
  3. Alternative tickover pathway: The pathway initiated when C3 at high concentration in serum undergoes spontaneous hydrolysis as its internal thioester bond, yielding the molecule C3(H20). 

Reference
  • OrlandoinMiami. "Learn New Words." Orlando Espinosa. N.p., 30 Oct. 2015. Web. 08 Dec. 2016.

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