CD14 as a Key Regulator in Inflammatory Signaling and Lipid Transport
CD14 as a Key Regulator in Inflammatory Signaling and Lipid Transport
Literature Information
Title: Dual Regulatory Roles of CD14 in Inflammasome Activation and Lipid Ligand Delivery
Journal: Frontiers in Immunology
Field: Innate immunity, inflammatory signaling, lipid metabolism
Research Background
CD14 is a glycosylphosphatidylinositol (GPI)-anchored receptor widely expressed on myeloid cells. Traditionally recognized as a co-receptor for LPS-induced TLR4 signaling, emerging evidence reveals that CD14 also binds oxidized phospholipids (OxPL) and mediates endogenous danger signal recognition. This dual ligand-binding ability makes CD14 a critical molecular hub connecting microbial infection, tissue injury, and inflammatory responses. However, the precise mechanisms by which CD14 distinguishes exogenous and endogenous ligands, regulates endocytosis, and modulates inflammasome activation remain incompletely understood.
Research Approach
This study systematically investigated the ligand-binding characteristics, intracellular trafficking, and downstream signaling of CD14 using immunofluorescence imaging, immunoprecipitation, and functional cellular assays. The research team explored the competitive binding between OxPL and LPS, the conformational changes of CD14 upon ligand stimulation, and the cell-type-specific responses in dendritic cells and macrophages. CD14-specific antibodies were used to validate subcellular localization and protein–protein interactions throughout the study.
Research Outcomes
- Dual Ligand Recognition Mechanism
CD14 contains a large hydrophobic ligand-binding pocket formed by four N-terminal domains, which accommodates both LPS and oxidized phospholipids. These ligands competit bind to the same site, leading to mutually inhibitory effects.
- TLR4-Independent Endocytosis Pathway
CD14 mediates the internalization of OxPL through activating PLCγ and Syk signaling cascades, independent of TLR4 activation. This endocytic process leads to transient CD14 depletion from the plasma membrane and attenuated responses to secondary LPS stimulation.
- Dendritic Cell Hyperactivation Program
CD14 promotes a unique hyperactivation state in dendritic cells, characterized by sustained IL-1β secretion without inducing cell death. This process depends on the caspase-11 non-canonical inflammasome pathway.
- Cell-Type-Specific Functional Differences
CD14 exerts distinct functions in different myeloid subsets: it promotes inflammasome activation in dendritic cells while exerting regulatory roles in macrophage inflammatory responses.
- Therapeutic Target Potential
Modulation of CD14 activity provides a potential strategy for balancing protective immunity and pathological inflammation, with implications in sepsis, chronic inflammatory diseases, and tissue injury repair.
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ANT BIO PTE. LTD. provides high-performance CD14 recombinant rabbit monoclonal antibody (Cat. No. S0B2050), which supports accurate detection of CD14 protein expression, subcellular localization, and relative quantification in formalin-fixed paraffin-embedded (FFPE) samples and frozen sections.
This antibody enables:
- Reliable identification of CD14-positive myeloid cells in tissue microenvironments
- Clear visualization of membrane-localized and endosomal CD14
- Stable and consistent detection in cellular functional assays
- High-specificity validation of CD14-mediated endocytosis and signaling events
Brand Mission
ANT BIO PTE. LTD. is committed to providing high-quality, reliable reagents for life science research. Through our three specialized sub-brands, we support global researchers in exploring the mechanisms of immunity, inflammation, and infectious diseases:
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Related Product List
- CD14 Recombinant Rabbit Monoclonal Antibody (S0B2050)
- Inflammasome Pathway Antibody Panel
- Lipid Transport Signaling Assay Kit
- Myeloid Cell Identification Antibody Cocktail
- TLR4 Sign Pathway Toolkit
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