| Gc globulin | Group-specific complement globulin |
|---|---|
| AC | abdominal circumference; abdominal compression; absorption coefficient; abuse case; acetate; acetylc... |
| AICF | autoimmune complement fixation |
| ASAC | acidified serum-acidified complement |
| C1 | first cervical nerve; first cervical vertebra; first component of complement |
| complement 3b | <chemical> The larger fragment formed when c3 convertase splits c3 into c3a and c3b. In both the classical and alternate pathway, c3b participates in immune adherence and enhances phagocytosis. It also forms a cellular intermediate which continues the complement process. In the alternate pathways, c3b initiates a positive feedback activation of c3pase. Chemical name: Complement C3b (12 Dec 1998) |
|---|---|
| complement 3b inactivators | Compounds which inhibit, antagonise, or inactivate complement 3b. A well-known inhibitor is a beta-globulin which cleaves c3b into inactive fragments c3c and c3d. C3bina plays a key role in the regulation of the complement system by blocking the cytolytic sequence and preventing recruitment of the properdin amplification loop. (12 Dec 1998) |
| complement 3c | <chemical> An inactivated form of complement 3b (c3b). Complement 3b is inactivated with the help of two regulatory factors, complement factor h and complement factor I. Complement factor h (c3b inactivator accelerator) makes c3b susceptible to the serine protease, complement factor I (formerly called kaf, c3binf, or enzyme 3b inactivator), to form ic3b. Then complement factor I and a trypsin-like proteolytic enzyme further cleave ic3b into c3c and c3dg. Chemical name: Complement C3c (12 Dec 1998) |
| complement 3 convertase | <enzyme> The enzyme which in both the classical and alternate complement pathways cleaves complement 3 into anaphylatoxin (c3a) and c3b. Registry number: EC 3.4.21.43 (12 Dec 1998) |
| complement 3d | <chemical> An inactivated fragment of complement 3b (c3b). Factor h makes c3b susceptible to factor I (formerly called kaf, c3binf, or enzyme 3b inactivator) to form ic3b. Then factor I and a trypsin-like proteolytic enzyme further cleave ic3b into c3c and c3dg. Serum proteases degrade c3dg into complement 3d (c3d) and c3g. Chemical name: Complement C3d (12 Dec 1998) |
| complement 3 nephritic factor | A magnesium-dependent IgG autoantibody found in serum of patients with chronic mesangioproliferative hypocomplementemic glomerulonephritis. It causes inactivation of c3 in the alternate pathway by cleaving c3 into two inactive fragments, c3c and c3d, instead of the normal c3b. (12 Dec 1998) |
| complement 4 | The second component to react in the complement sequence. It is a beta-globulin with a sedimentation coefficient of 18.7, a molecular weight of 240,000 and a serum concentration of 430 micrograms/ml. It is activated by complement 1 and serves as a receptor for c2. (12 Dec 1998) |
| complement 4a | <chemical> Smaller fragment formed when c1s splits c4 into c4a and c4b. As an anaphylatoxin, c4a causes symptoms of immediate hypersensitivity but it has weaker activity than c3a or c5a. Chemical name: Complement C4a (12 Dec 1998) |
| complement 4b | <chemical> Larger fragment formed when c1s splits c4 into c4a and c4b. C4b combines with c2b to form the activated c4b2b complex which is often called the classical pathway c3 convertase. Chemical name: Complement C4b (12 Dec 1998) |
| complement 6 | The sixth component in the complement reaction sequence. It is a beta-globulin with a sedimentation coefficient of 8.7 and a molecular weight of 120,000 at 60 micrograms/ml in serum. It may exist in a complex with c5 and c7 and is activated by the binding of c5. (12 Dec 1998) |
| complement 7 | The seventh component in the complement reaction sequence. It is a beta-globulin probably in a complex with c5 and c6 and is activated by c5. The attachment of c7 renders the cell susceptible to lysis. (12 Dec 1998) |
| complement 8 | The next to the last essential component for cell lysis in the complement reaction sequence. It is a gamma-globulin with a molecular weight of 150,000 and a sedimentation coefficient of 8. It is present in trace amounts in serum and can be inhibited, like complement 1, by cation chelators. (12 Dec 1998) |
| complement 9 | The last component in the complement reaction sequence. It is an alpha-globulin present in serum as a trace, with a molecular weight of 80,000 and a sedimentation coefficient of 4.5. For cell lysis, it can be replaced by a metal chelator. (12 Dec 1998) |
| complement activating enzymes | <enzyme> Enzymes present in the complement system which activate one or more components in the system. Registry number: EC 3.- (12 Dec 1998) |
| complement activation | The sequential activation of serum components c1 through c9, initiated by an erythrocyte-antibody complex or by microbial polysaccharides and properdin, and producing an inflammatory response. (12 Dec 1998) |