Chemically dimerized intravenous immunoglobulin has potent ameliorating activity in a mouse immune thrombocytopenic purpura model
- 作者：Yusuke Machino ; yusuke.machino@kyowa-kirin.co.jp ; Emiko Suzuki ; Saki Higurashi ; Hiroto Ohta ; Mami Suzuki ; Junya Kohroki1 ; Yasuhiko Masuho
- 关键词：Intravenous immunoglobulin ; Immune thrombocytopenic purpura ; Fc gamma receptor ; Chemical dimerization ; Platelet
- 刊名：Biochemical and Biophysical Research Communications
- 出版年：2012
- 期刊代码：159_0006291x
- 类别：bio
- 出版时间：24 February, 2012
- 卷：418
- 期：4
- 页码：748-753
- 文件大小：503 K
摘要
High-dose intravenous immunoglobulin (IVIG) preparations are currently used for the treatment of autoimmune diseases such as immune thrombocytopenic purpura (ITP). Although the mechanisms of IVIG efficacy remain enigmatic, some clinical and laboratory studies suggest that interaction of the Fc domain of IgG, especially the Fc domain of dimeric IgG, with its receptors (Fc gamma receptors; Fc纬Rs) plays an essential role. In this study, IVIG was dimerized with chemical crosslinkers to augment its therapeutic efficacy. Dimerized IVIG was found to have a much higher affinity for Fc纬Rs than monomeric IVIG. In a mouse ITP model, chemically dimerized IVIG abrogated the decrease in platelet numbers in the blood that was caused by an anti-platelet antibody at a dose that was one tenth of the required dose of IVIG. These results suggest that chemical dimerization of IVIG should greatly improve the efficacy of IVIG therapy of ITP.