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VEGF-A produced by chronically inflamed tissue induces lymphangiogenesis in draining lymph nodes. | LitMetric

AI Article Synopsis

Article Abstract

Lymphangiogenesis is involved in tumor cell metastasis and plays a major role in chronic inflammatory disorders. To investigate the role of lymphangiogenesis in inflammation, we induced and maintained delayed-type hypersensitivity (DTH) reactions in the ears of mice and then analyzed the resulting lymphangiogenesis in the inflamed tissue and draining lymph nodes (LNs) by quantitative fluorescence-activated cell sorting (FACS) and by immunofluorescence. Long-lasting inflammation induced a significant increase in the number of lymphatic endothelial cells, not only in the inflamed ears but also in the ear-draining auricular LNs. Inflammation-induced lymphangiogenesis was potently blocked by systemic administration of a vascular endothelial growth factor (VEGF)-A neutralizing antibody. Surprisingly, tissue inflammation specifically induced LN lymphangiogenesis but not LN angiogenesis. These findings were explained by analysis of both VEGF-A protein and mRNA levels, which revealed that VEGF-A was expressed at high mRNA and protein levels in inflamed ears but that expression was increased only at the protein level in activated LNs. Inflammation-induced lymphangiogenesis in LNs was independent of the presence of nodal B lymphocytes, as shown in B cell-deficient mice. Our data reveal that chronic inflammation actively induces lymphangiogenesis in LNs, which is controlled remotely, by lymphangiogenic factors produced at the site of inflammation.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2200913PMC
http://dx.doi.org/10.1182/blood-2007-01-066811DOI Listing

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