Human milk proteins including secretory IgA fail to elicit tolerance after feeding.

Human milk proteins including secretory IgA fail to elicit tolerance after feeding.
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母乳蛋白(包括分泌型 IgA)在喂养后无法引起耐受性。

DOI:
10.1093/intimm/10.4.537
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发表时间:
1998
影响因子:
4.4
通讯作者:
Kiyono,H
Kiyono,H
中科院分区:
医学3区
文献类型:
--
作者:
Yuki,Y;Fujihashi,K;Yamamoto,M;McGhee,JR;Kiyono,H

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口服大剂量的蛋白质抗原通常会诱导全身无反应状态,目前称为粘膜诱导耐受。在本研究中,我们使用不含酪蛋白的人乳蛋白(HMP)作为多蛋白抗原来研究粘膜诱导的耐受性。本研究中使用的HMP主要含有分泌型(S) IgA、乳铁蛋白(Lf)和α-乳白蛋白(Lact)。当小鼠在全身免疫前连续4周口服1或25mg HMP 3次或连续4周口服25mg时,随后用100μg HMP进行肠胃外免疫诱导针对HMP的抗原特异性血清IgG反应。对 IgG 亚类的分析表明,IgG1 和 IgG2b 是所记录的 IgG 反应的原因。当 HMP 和卵清蛋白 (OVA) 都喂给小鼠时,小鼠产生了对 OVA 的耐受性,但没有对 HMP 产生耐受性。为了进一步研究口服 HMP 后观察到的免疫反应的性质,我们检查了对 HMP 单个蛋白的反应。通过口服 HMP 进行全身免疫,可诱导对 S-IgA 和 Lf 的快速血清 IgG1 和 IgG2b 反应。对口服 HMP 的小鼠脾脏 CD4+ T 细胞的分析显示,产生 Th2 型细胞因子,但不产生 Th1 型细胞因子。这些结果表明,口服 HMP 优先诱导排他性 Th2 型免疫反应,这可能会阻止 HMP(S-IgA 和 Lf)特异性粘膜诱导耐受的发展。
Oral administration of large doses of protein antigen generally induces a state of systemic unresponsiveness currently termed mucosally induced tolerance. In this study, we used human milk protein (HMP) without casein as a multi-protein antigen for the study of mucosally induced tolerance. The HMP utilized in this study mainly contained secretory (S) IgA, lactoferrin (Lf) and alpha-lactalbumin (Lact). When mice were given 1 or 25 mg of HMP orally 3 times or 25 mg orally four consecutive weeks prior to systemic immunization, antigen-specific serum IgG responses to HMP were induced by subsequent parenteral immunization with 100 microg of HMP. Analysis of IgG subclasses revealed that IgG1 followed by IgG2b accounted for the IgG responses noted. When both HMP and ovalbumin (OVA) were fed to mice, tolerance developed to OVA but not to HMP. To further investigate the nature of immune responses seen following oral gavage of HMP, we examined responses to individual protein of HMP. Brisk serum IgG1 and IgG2b responses to both S-IgA and Lf were induced by oral followed by systemic immunization with HMP. Analysis of splenic CD4+ T cells from mice given oral HMP revealed production of Th2- but not Th1-type cytokines. These results show that oral administration of HMP preferentially induces exclusive Th2-type immune responses, which may prevent the development of HMP (S-IgA and Lf)-specific mucosally induced tolerance.
免疫球蛋白 IgA。
DOI: --
发表时间: 1970
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DOI: --
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期刊: Journal of immunology (Baltimore, Md. : 1950)
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期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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DOI: --
发表时间: 1994
影响因子: 4.4
作者:
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