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study provides conclusive evidence that an intact complement LP is essential to initiate CAIA, and that MAp44 may be an appropriate treatment for inflammatory arthritis.
Data indicate that co-deficiency of factor H (FH (show CFH Proteins)) and MASP-1/MASP-3 did not ameliorate either the plasma Complement C3 (show C3 Proteins) (C3) activation or glomerular C3 accumulation in FH-deficient mice.
Within the mannose-binding lectin (show MBL2 Proteins)/MASP complex, MASP-1 is the necessary complement component for thrombin (show F2 Proteins)-like activity in vitro.
We conclude that MASP-1 does not require binding to mannose binding lectins or ficolins to activate the alternative pathway of complement
we investigated the mechanism of MASP-3 activation and its substrate using the recombinant mouse MASP-3 (rMASP-3) and several different types of MASP-deficient mice
Our studies demonstrate for the first time, to our knowledge, the absolute requirement for the activity of MASP-1 protein in autoimmune-associated inflammatory tissue injury
MASP-1 converted pro-Df to the active form in vitro, although the activation mechanism of pro-Df by MASP-1 is still unclear. Thus, it is clear that MASP-1 is an essential protease of both the lectin and alternative complement pathways.
MASP-1 contributes to the activation of the lectin pathway, probably through the activation of MASP-2 (show MASP2 Proteins).
described for the first time a detailed model of prothrombin (show F2 Proteins) activation by MASP-1
Fusion of MAP-1 with FH domains represents a novel therapeutic approach for selective targeting upstream and central complement activation at sites of inflammation
The levels of MASP-1 and MASP-1/C1-INH complexes are reduced in HAE patients compared with controls. Both MASP-1 and MASP-1/C1-INH complexes are related to the degree of complement C4 consumption
Polymorphisms in MASP1 and MASP2 (show MASP2 Proteins) genes are associated with the susceptibility or protection to infectious diseases. (Review)
Because MASP-1 and MASP-2 (show MASP2 Proteins) have been shown to interact directly with blood coagulation, elevated levels of these proteins may play a role in the enhanced thrombotic environment and consequent vascular complications in diabetes.
MASP-1 cleaves prothrombin (show F2 Proteins) and identified its cleavage sites, suggesting that MASP-1 gives rise to an alternative active form of thrombin (show F2 Proteins) by cleaving at the cleavage site R393.
MASP-1 may activate neutrophils indirectly via endothelial cells.
Data indicate that MASP-1 and MASP-2 (show MASP2 Proteins) can readily form heterodimers after dissociation and re-association, however, in the presence of Ca(2 (show CA2 Proteins)+) exchange of subunits is slow between the homodimers.
Data show that among the components of the mannose-binding lectin (MBL (show MBL2 Proteins)) and associated serine proteases (MASPs) only MASP-1 is able to trigger response in endothelial cells (HUVECs) and the proteolytic activity of MASP-1 is essential.
Polymorphisms in the MASP1 gene are associated with serum levels of MASP-1, MASP-3, and MAp44
This gene encodes a serine protease that functions as a component of the lectin pathway of complement activation. The complement pathway plays an essential role in the innate and adaptive immune response. The encoded protein is synthesized as a zymogen and is activated when it complexes with the pathogen recognition molecules of lectin pathway, the mannose-binding lectin and the ficolins. This protein is not directly involved in complement activation but may play a role as an amplifier of complement activation by cleaving complement C2 or by activating another complement serine protease, MASP-2. The encoded protein is also able to cleave fibrinogen and factor XIII and may may be involved in coagulation. A splice variant of this gene which lacks the serine protease domain functions as an inhibitor of the complement pathway. Alternate splicing results in multiple transcript variants.
, complement factor MASP-3
, complement-activating component of Ra-reactive factor
, mannan-binding lectin serine protease 1
, mannose-binding lectin-associated serine protease 1
, mannose-binding protein-associated serine protease
, ra-reactive factor serine protease p100
, serine protease 5
, Ra-reactive factor serine protease p100