For certain targets, interaction of the complement proteins with the target cell or microorganism causes direct lysis of that microorganism or cell [82].
The mechanism of selective adsorption is thought to be mediated by the interaction of the complement receptor and Fc receptor on granulocytes and monocytes, whereas complement factors and immunoglobulins adhere to the surface of cellulose acetate beads via ligand-receptor interactions [6, 15].
In this study, we focused on the interaction of the complement anaphylatoxin C5a with its receptors, C5aR and C5L2, and demonstrated that TLR activation exerts substantial positive modulation on C5a-induced pro-inflammatory cell responses to microbial components and whole bacteria in vitro and ex vivo.
Studies in the presence of 1 and 10 U/ml heparin revealed that the absence of BT-061 mediated CD4 down-modulation in the circulating whole blood system was not due to interactions of the complement system with BT-061, which is an antibody of the IgG1 class that potentially has the capacity to interact with the complement system.
Immune complexes, namely antigens opsonized by antibodies and complement, are bound to erythrocytes through specific interactions of the complement protein C3b with the erythrocyte complement receptor 1 (CR1 or CD35) in the erythrocyte membrane.
ARC1905 is meant to bind C5 to prevent its interaction during activation of the complement cascade.
The entry of L. major into macrophages is mediated in part by the interaction of the parasite with the complement 3-receptor (CR3, CD11b/CD18, Mac-1) (Mosser and Edelson, 1985; Brittingham et al., 1999; Kedzierski et al., 2004), which acts in conjunction with the mannose-fucose receptor (MFR) for parasite engulfment, at least for L. donovani (Blackwell et al., 1985).
The growing interest for mCRP has highlighted its importance in several disease states [ 40- 42] and revealed bioactivities in vitro and in vivo regarding elimination of immune complexes [ 43], interaction with the complement system [ 14, 44, 45], affinity for different Fcγ receptors [ 46], and proinflammatory effects on platelets [ 47] and blood lipids [ 48].
EBV binds to B-lymphocytes through interaction of the glycoprotein gp350/220 with the complement receptor CD21[8].
Like other complement serine proteases C1s has restricted substrate specificity and it is engaged into specific interactions with other subcomponents of the complement system.
Stoiber, H., Ebenbichler, C., Schneider, R., Janatova, J. & Dierich, M.P. Interaction of several complement proteins with gp120 and gp41, the two envelope glycoproteins of HIV-1.
