Article

Bouwman LH, Roep BO, Roos AMannose-binding lectin: clinical implications for infection, transplantation, and autoimmunity. Hum Immunol 67:247-256

Leiden University, Leyden, South Holland, Netherlands
Human Immunology (Impact Factor: 2.14). 04/2006; 67(4-5):247-56. DOI: 10.1016/j.humimm.2006.02.030
Source: PubMed

ABSTRACT

Mannose-binding lectin (MBL) is a recognition molecule of the lectin pathway of complement and a key component of innate immunity. MBL variant alleles have been described in the coding region of the MBL gene, which are associated with low MBL serum concentration and impaired MBL structure and function. Both high and low serum levels of functional MBL have been associated with a variety of diseases and disease complications. Functioning as double-edged sword, low MBL serum levels have been shown to enhance the risk for infections. On the other hand, high MBL serum levels and high MBL activity have been associated with inflammatory diseases, transplant rejection, and diabetic nephropathy. Underscoring the Jekyll-and-Hyde character of MBL, both high and low serum MBL levels are associated with several aspects of autoimmune diseases. This review provides a general outline of the genetic and molecular characteristics of MBL and discusses MBL-disease association and its consequence in infection, transplantation, and autoimmunity.

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    • "In blood plasma this protein is associated with serine proteases. Both low and high levels of MBL in the blood indicate a variety of diseases, e.g., a high level of MBL was observed during inflammation (Bouwman et al., 2006). Here we focused on alterations that might be connected with periparturient changes. "
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    ABSTRACT: The organism undergoes tremendous changes at the end of pregnancy and beginning of lactation. The aim of the study was to analyze the physiological changes in cows during the last month of a first pregnancy and the first 2 months of lactation, based on the protein expression in peripheral blood plasma. Changes were observed in the expression of proteins involved in lipid metabolism (apolipoprotein A-I, apolipoprotein E, apolipoprotein J, and apolipoprotein A-IV); immune defense (complement C4 protein and mannose-binding protein C); blood clotting (fibrinogen alpha chain, fibrinogen gamma B-chain, and fibrinogen-like protein 1); as well as reconstruction, regeneration, and defense of cells and tissues (fibrinogen-like protein 1, glutathione peroxidase 3, endopin-1, Kelchlike ECH-associated protein 1, 72 kDa type IV collagenase, and pigment epithelium-derived factor). Multidimensional changes in the cow organism observed on the protein level at the end of pregnancy and during the first months of lactation highlight the immense challenges the organism must overcome to maintain homeostasis.
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    • "c o m / l o c a t e / h u m i m m activate the functional responses of human neutrophils [1] [2] [4]. The description of molecular features of FccR [5] and CR [6] [7] has improved comprehension of the effector functions of human neutrophils triggered via these receptors, but the specific role of polymorphic variants remains unclear. The binding of IgG to FccR induces a wide range of biological responses [3], which provides an important link between cellular and humoral immunity. "
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    ABSTRACT: Considering that human neutrophil FcγRIIa and FcγRIIIb receptors interact synergistically with CR3 in triggering neutrophil functional responses, allelic polymorphisms in these receptors might influence such interactions. We assessed whether FcγRIIIb polymorphisms affect FcγR/CR cooperation in mediating the neutrophil oxidative burst (OB), in particular the FcγRIIIb/CR3 cooperation that occurs via lectin-saccharide-like interactions. The OB of human neutrophil antigen (HNA)-1a-, HNA-1b-, and HNA-1a/-1b-neutrophils stimulated with immune complexes, opsonized or not with serum complement, was measured by the luminol-enhanced chemiluminescence assay. Compared with HNA-1a-neutrophils, HNA-1b-neutrophils exhibited reduced FcγR-stimulated OB, but increased FcγR/CR-stimulated OB. It suggests that (i) FcγR and CR cooperate more effectively in HNA-1b-neutrophils, and (ii) the HNA-1b allotype influences the FcγRIIIb cooperation with FcγRIIa, but not with CR3. HNA-1a- and HNA-1b-neutrophils exhibited similar OB responses elicited via CR3 alone or via FcγR/CR-independent pathways. In addition, the level of FcγRIIIb, FcγRIIa, and CR3 expression did not differ significantly among the neutrophil groups studied. Together, these results demonstrate that the HNA-1b allotype influences the functional cooperation between FcγRIIIb and FcγRIIa, and suggest that the difference in the glycosylation pattern between HNA-1a and HNA-1b does not affect the FcγRIIIb cooperation with CR3.
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    • "High levels of MBL, might result in excessive component activation and prime adaptive immune response, but on the other hand suppress cytokine release (Jack et al., 2001; Wang et al., 2011). Low levels of MBL might enhance adaptive autoimmune response, because of impaired clearance of apoptotic and necrotic cells (Bouwman et al., 2006; Nauta et al., 2003) and enhanced cytokine release (Jack et al., 2001). One previous, relatively small, study has shown association between high producing MBL genotypes and MBL-complex activity , with the development of T1D (Bouwman et al., 2005). "
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