Key Points
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Lipid rafts act as platforms in B cells for B-cell receptor (BCR) signalling and antigen targeting.
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Rafts concentrate the Src-family kinase Lyn and exclude the BCR and receptors that negatively regulate BCR signalling.
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BCR oligomerization results in association of the BCR with lipid rafts and its phosphorylation by Lyn, initiating signalling.
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The association of the BCR with lipid rafts changes during B-cell development, which might contribute to the differences in the outcome of antigen encounter.
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B-cell co-receptors, including CD19–CD21 and FcγRII influence the association of the BCR with rafts, which might represent a new mechanism for co-receptor function.
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Epstein–Barr-virus-encoded gene products LMP1 and LMP2A are constitutively associated with rafts and act within rafts to block BCR signalling, providing signals for longevity and inducing latency.
Abstract
The B-cell antigen receptor acts during B-cell activation both to initiate signalling cascades and to transport antigen into the cell for subsequent processing and presentation. Recent evidence indicates that membrane microdomains, termed lipid rafts, have a role in B-cell activation as platforms for B-cell receptor (BCR) signalling and might also act in antigen trafficking. Lipid rafts might facilitate the regulation of the BCR during B-cell development by B-cell co-receptors, and during viral infection. So, lipid rafts seem to be an important new piece of the B-cell signalling puzzle.
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Authors and Affiliations
Glossary
- ITAM
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Immunoreceptor tyrosine-based activation motif, which is present in the cytoplasmic domains of the BCR Igα–Igβ complex and becomes tyrosine phosphorylated by Lyn after BCR activation.
- FLUORESCENCE RESONANCE ENERGY TRANSFER
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A method to determine whether proteins are close to one another by measuring the loss of fluorescence anisotropy between fluorophores that are associated with the proteins.
- SINGLE FLUOROPHORE TRACKING MICROSCOPY
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A method to measure the lateral motion of a single fluorescently labelled molecule in the plasma membrane using single dye tracking. It yields information about the diffusion and dynamics of individual raft proteins and lipids.
- PHOTONIC FORCE MICROSCOPY
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A method to measure the local viscous drag of a single membrane protein using a laser trap. It yields information about the size and dynamics of individual rafts.
- ANERGY
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A state of non-reactivity in B cells that is induced by antigen exposure, commonly in immature B cells
- ITIM
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Immunoreceptor tyrosine-based inhibitory motif that is present in the cytoplasmic domain of several inhibitory receptors that become tyrosine phosphorylated and recruits the phosphatases SHP1 and SHIP.
- GERMINAL CENTRE
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A specialized microenvironment in lymph nodes and spleens that forms after antigenic stimulation and is a site of extensive B-cell proliferation and somatic hypermutation of the immunoglobulin genes.
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Pierce, S. Lipid rafts and B-cell activation. Nat Rev Immunol 2, 96–105 (2002). https://doi.org/10.1038/nri726
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DOI: https://doi.org/10.1038/nri726
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