2021年4月8日
Recognition of acrolein-specific epitopes by B cell receptors triggers an innate immune response.
The Journal of biological chemistry
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- 開始ページ
- 100648
- 終了ページ
- 100648
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.jbc.2021.100648
Natural antibodies, predominantly immunoglobulin M (IgM), play an important role in the defense against pathogens and in maintaining homeostasis against oxidized molecules known as oxidation-specific epitopes, such as those contained in oxidized low-density lipoproteins. However, due to the complexity of the oxidized products, very few individual epitopes have been characterized in detail. In the present study, to identify endogenous sources of oxidation-specific epitopes, we stimulated mouse spleen and peritoneal cavity (PerC) cells in vitro with bovine serum albumin (BSA) modified with a variety of lipid peroxidation-related carbonyl compounds, and identified the acrolein-modified BSA (acrBSA) as the most efficient trigger studied for the production of IgM in PerC cells. The acrolein-specific epitopes accelerated the differentiation of B-1a cells, a fetal-derived B cell lineage, to plasma cells. In addition, acrBSA was specifically bound to B-1a cells, suggesting the presence of an acrolein-specific IgM-B cell receptor (BCR). A hybridoma, RE-G25, producing an acrolein-specific IgM, was established from the PerC cells and was indeed identified as a population of B cells expressing a specific IgM-BCR. In addition, we analyzed the BCR repertoire of acrolein-specific B cells and identified the most frequent IgM heavy chain gene segments of the B cells. These data established the presence of innate B cells expressing the acrolein-specific BCR, and suggested that in addition to our understanding of acrolein as a toxic aldehyde, acrolein may play a role as a trigger of the innate immune response.
- リンク情報
- ID情報
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- DOI : 10.1016/j.jbc.2021.100648
- PubMed ID : 33839149
- PubMed Central 記事ID : PMC8121969