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Cell-surface nucleolin is involved in lipopolysaccharide internalization and signalling in alveolar macrophages.

Authors: Wang, Y  Mao, M  Xu, JC 
Citation: Wang Y, etal., Cell Biol Int. 2011 Jul;35(7):677-85. doi: 10.1042/CBI20100625.
Pubmed: (View Article at PubMed) PMID:21309751
DOI: Full-text: DOI:10.1042/CBI20100625

C23 (nucleolin) shuttling between the nucleus, cytoplasm and cell surface has been implicated in controlling regulatory processes and may play a role in pathogen infection and autoimmune diseases. It has been reported that cell surface-expressed C23 on THP-1 monocytes is involved in the inflammatory response induced by LPS (lipopolysaccharide). This study investigates whether C23 is a membrane receptor for LPS during LPS-induced AMs (alveolar macrophages) activation. First, using immunofluorescence and microscopy, we detected the expression of C23 on the surface of AMs. Second, using LPS affinity columns, we demonstrated that C23 directly binds to LPS. Third, we found that LPS colocalized with C23 on both the cell surface and in the cytoplasm. Finally, knockdown of C23 expression on the cell surface using siRNA (small interfering RNA) led to significant reductions in the internalization of LPS, in LPS-induced NF-kappaB (nuclear factor kappaB)-DNA binding and in the protein expression of TNF (tumour necrosis factor)-alpha and IL-6 (interleukin-6). These findings provide evidence that cell-surface C23 on AMs may serve as a receptor for LPS and are essential for internalization and transport of LPS. Furthermore, C23 participates in the regulation of LPS-induced inflammation of AMs, which indicates that cell-surface C23 is a new and promising therapeutic target for the treatment of bacterial infections.

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CRRD Object Information
CRRD ID: 9686449
Created: 2015-02-09
Species: All species
Last Modified: 2015-02-09
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.