化IgG抗炎活性的分子决定因素
Sunny L Sneed1, Elizabeth A Strandberg1, Ana F S Laureano1
1Center for Immunology and Inflammatory Diseases, Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129.
概括
对IgG1和IgG3抗体的化赋予了抗炎活性,这取决于DC-SIGN/SIGN-R1. 在CH2域中特定的氨基酸残留决定了这种效应,使治疗IgG子类的工程成为可能.
科学领域:
- 免疫学 免疫学 免疫学
- 葡萄糖生物学 葡萄糖生物学
- 治疗抗体工程 治疗抗体工程
背景情况:
- 免疫球蛋白G (IgG) 抗体对于治疗至关重要.
- 在IgG Fc区域上的N结合甘氨酸显著影响效应器功能.
- 已知IgG1 Fc甘氨酸的终端化可以赋予抗炎性质.
研究的目的:
- 为了调查化是否赋予其他IgG亚类除IgG1.1之外的其他IgG亚类的抗炎活性.
- 为了确定分子机制,包括特定的氨基酸残留物和受体相互作用,基底是化介导的抗炎作用.
- 探索设计具有增强抗炎性能的治疗IgG子类的潜力.
主要方法:
- 在小鼠体内对自身抗体介导的炎症进行体内研究,使用化和亚化IgG子类 (IgG1,IgG2,IgG3,IgG4).
- 对抗炎症活性的DC-SIGN和SIGN-R1依赖性的评估.
- Fc马受体结合试验用于化和亚化IgG子类.
- 氨基酸序列对齐和IgG CH2域的分子建模.
- 位点定向的突变发生,以设计IgG Fc变体.
主要成果:
- 化抑制了IgG1和IgG3的体内自身抗体介导炎症,但不抑制IgG2或IgG4.
- 这种抗炎活性取决于DC-SIGN或其小鼠正义体,SIGN-R1.
- IgG1和IgG3共享类似的Fc玛受体结合特征,与IgG2和IgG4不同.
- 在CH2域 (位置234和327) 中,两个保存的氨基酸残留物是IgG1和IgG3的独特特征.
- 将这些残留物转化为IgG4-Fc赋予了依赖于化的抗炎活性,而它们从IgG1中去除则取消了它.
结论:
- 化赋予IgG1和IgG3亚类的抗炎活性,通过DC-SIGN/SIGN-R1.1进行介导.
- 在IgG1和IgG3的CH2域中,特定的保留氨基酸残留对这种抗炎功能至关重要.
- 这些发现为合理设计具有量身定制的抗炎性质的治疗IgG子类提供了基础.
相关概念视频
Antibody Structure
52.5K
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
52.5K
Transcytosis of IgG
3.4K
Transcytosis is the process in which molecules are internalized by endocytosis, transported across the cell, and released through exocytosis from the opposite end of the cell. Molecules such as insulin, immunoglobulins, and certain nutrients are transferred through the recycling endosomes by recycling and transcytosis.
IgG molecules from a mother undergo transcytosis starting around 13 weeks of gestation. The amount of IgG transferred and entering the fetal blood circulation increases with...
IgG molecules from a mother undergo transcytosis starting around 13 weeks of gestation. The amount of IgG transferred and entering the fetal blood circulation increases with...
3.4K
Immunoglobulin-like Cell Adhesion Molecules
3.3K
Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
3.3K
T Cell Types and Functions
3.2K
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
3.2K
Inflammatory Bowel Disease III: Crohn's Disease
69
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
69


