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- W3019660999 abstract "Abstract B lymphocytes are important players of the adaptive immune system. However, not just activation of B cells but also regulation of B cell signaling is important to prevent hyperactivity and dysregulation of the immune response. Different mechanisms and proteins contribute to this balance. One of these is CD22, a member of the Siglec family. It is an inhibitory coreceptor of the BCR and inhibits B cell activation. Upon BCR stimulation, CD22-dependent inhibition of BCR signaling results in a decreased calcium mobilization. Although some CD22 binding partners have already been identified, the knowledge about the CD22 interactome is still incomplete. In this study, quantitative affinity purification–mass spectrometry enabled the delineation of the CD22 interactome in the B cell line DT40. These data will clarify molecular mechanisms and CD22 signaling events after BCR activation and revealed several new CD22-associated proteins. One new identified interaction partner is the E3 ubiquitin ligase cullin 3, which was revealed to regulate CD22 surface expression and clathrin-dependent CD22 internalization after BCR stimulation. Furthermore cullin 3 was identified to be important for B lymphocytes in general. B cell–specific cullin 3-deficient mice show reduced developing B cells in the bone marrow and a severe pro-B cell proliferation defect. Mature B cells in the periphery are also reduced and characterized by increased CD22 expression and additionally by preactivated and apoptotic phenotypes. The findings reveal novel functions of cullin 3 in B lymphocytes, namely regulating CD22 surface expression and internalization after B cell activation, as well as promoting proliferation of pro-B cells." @default.
- W3019660999 created "2020-05-01" @default.
- W3019660999 creator A5015935858 @default.
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- W3019660999 creator A5090957913 @default.
- W3019660999 date "2020-06-15" @default.
- W3019660999 modified "2023-10-01" @default.
- W3019660999 title "Cullin 3 Is Crucial for Pro-B Cell Proliferation, Interacts with CD22, and Controls CD22 Internalization on B Cells" @default.
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- W3019660999 doi "https://doi.org/10.4049/jimmunol.1900925" @default.
- W3019660999 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32341059" @default.
- W3019660999 hasPublicationYear "2020" @default.