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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hyper IgM syndrome ： ウィキペディア英語版 Hyper IgM syndrome Hyper IgM syndrome is a family of genetic disorders in which the level of Immunoglobulin M (IgM) antibodies is relatively high. The most common type is a result of a defect in a Th2 cell protein (CD40 ligand). The disorder causes immunodeficiencies, including a higher than normal susceptibility to various types of infections. Individuals with hyper-IgM syndrome typically also have a low number of neutrophils and platelets. ==Pathophysiology== IgM is the form of antibody that all B cells produce initially, before they undergo class switching due to exposure to a recognized antigen. Healthy B cells efficiently switch to other types of antibodies as needed to attack invading bacteria, viruses, and other pathogens. Generally, in people with hyper IgM syndromes, the B cells keep making IgM antibodies because they can't switch to a different kind of antibody. This results in an overproduction of IgM antibodies and an underproduction of all other types, IgA, IgG, and IgE. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hyper IgM syndrome」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.