Structural heterogeneity of glycans in IgA molecules: Implications for IgA nephropathy

Structural heterogeneity of glycans in IgA molecules: Implications for IgA nephropathy
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IgA 分子中聚糖的结构异质性:对 IgA 肾病的影响

DOI:
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发表时间:
1997
期刊:
影响因子:
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通讯作者:
M. Tomana
M. Tomana
中科院分区:
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文献类型:
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作者:
J. Mestecky;M. Tomana

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摘要:糖蛋白上的碳水化合物部分,包括免疫球蛋白(Ig),涉及广泛的生物学功能。通过酶或化学去除糖基、抑制糖基化或天冬酰胺残基的定点突变以阻止N-连接糖基化,Ig上的碳水化合物参与肝细胞或其他细胞的结合、内化和分解代谢、与吞噬细胞上的Fc受体结合、补体激活和调理。人免疫球蛋白A1的结构在所有免疫球蛋白中是独一无二的。重链含有一个铰链区,具有其他免疫球蛋白中未见的特征一级结构,并含有5个短的O-连接的寡糖侧链,由丝氨酸连接的N-乙酰半乳糖胺(GalNAc)和βL-3连接的半乳糖(Gal)组成。这两种单糖都可以被唾液酸化。与普遍存在的N-连接侧链相反,O-连接的碳水化合物部分在人血清糖蛋白中很少发现。我们已经证明,来自IgA肾病(IgAN)患者血清中的IgA1蛋白的半乳糖化程度低于健康对照组。用GalNAc特异性凝集素处理的IgAN患者的Gal含量降低和IgA反应性降低表明,这些结构变化发生在位于IgA1铰链区的糖链上。因此,除了类风湿性关节炎、系统性红斑狼疮、炎症性肠病和其他疾病外,IgA肾病可能是观察到碳水化合物异常的慢性疾病的另一个例子,并可能参与发病机制。
Summary: The carbohydrate moieties on glycoproteins, including immunoglobulins (Ig), are involved in a broad spectrum of biological functions. As revealed by enzymatic or chemical removal of carbohydrate moieties, inhibition of glycosylation, or site‐directed mutagenesis of asparagine residues to prevent N‐linked glycosylation, carbohydrates on Ig have been shown to participate in binding, internalization and catabolism by hepatocytes or other cells, binding to Fc receptors on phagocytic cells, activation of complement, and opsonization. the structure of human IgA1 is unique among all Ig. the heavy chain contains a hinge region with a characteristic primary structure not seen in any other Ig, and which contains five short O‐linked oligosaccharide side‐chains composed of serine‐linked N‐acetylgalactosamine (GalNAc) and βl‐3‐linked galactose (Gal). Both of these monosaccharides may be sialylated. In contrast to ubiquitous N‐linked side‐chains, O‐linked carbohydrate moieties are found rarely among human serum glycoproteins. We have demonstrated that IgA1 proteins from the sera of patients with IgA nephropathy (IgAN) are galactosylated to a lesser extent than those from healthy controls. Decreased content of Gal and decreased reactivity of IgA from IgAN patients with lectins specific for GalNAc indicate that these structural changes occur on glycans located in the hinge region of IgA1. Thus, in addition to rheumatoid arthritis, systemic lupus erythmatosus, inflammatory bowel disease and other disorders, IgA nephropathy may represent another example of a chronic disease in which aberrancies of carbohydrates are observed and may participate in aetiopathogenesis.
DOI: 10.1172/jci112522
发表时间: 1986-06-01
影响因子: 15.9
作者:
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通讯作者: MESTECKY, J
DOI: 10.1172/jci109998
发表时间: 1980-01-01
影响因子: 15.9
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DOI: 10.1159/000422410
发表时间: 1993
影响因子: --
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通讯作者: Jackson,S
DOI: 10.1073/pnas.79.20.6229
发表时间: 1982-10
影响因子: 11.1
作者:
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通讯作者: R. Stockert;M. Kressner;J. Collins;I. Sternlieb;A. Morell
防御机制涉及免疫球蛋白 A 的 Fc 依赖性功能及其被细菌免疫球蛋白 A 蛋白酶的颠覆。
DOI: 10.1128/mr.52.2.296-303.1988
发表时间: 1988
期刊: Microbiological reviews
影响因子: --
作者:
Kilian,M;Mestecky,J;Russell,MW
通讯作者: Russell,MW