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pubmed-article:10679281pubmed:abstractTextWe have shown that muramyl dipeptide (MDP) conjugated to a 10-mer polyguanylic acid (PolyG) is specifically internalized by macrophages through scavenger receptor (SCR)-mediated endocytosis. Macrophages activated by PolyG-MDP displayed about 20-fold higher cytotoxic activity against nonmacrophage tumor cells compared to that elicited by free MDP. The PolyG-MDP was found to trigger the secretion of higher levels of interleukin-6, interleukin-1alpha, TNF-alpha, and nitric oxide in comparison to free MDP. Addition of antibodies directed against IL-6 and TNF-alpha to macrophage culture completely abrogated the tumoricidal response of PolyG-MDP, indicating that these two cytokines are primarily responsible for bioefficacy. This general approach of PolyG as a vehicle may find wide application in the delivery of genes and antisense oligonucleotides to macrophages.lld:pubmed
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pubmed-article:10679281pubmed:authorpubmed-author:BasuS KSKlld:pubmed
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pubmed-article:10679281pubmed:copyrightInfoCopyright 2000 Academic Press.lld:pubmed
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pubmed-article:10679281pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:10679281pubmed:articleTitleSelective activation of antitumor activity of macrophages by the delivery of muramyl dipeptide using a novel polynucleotide-based carrier recognized by scavenger receptors.lld:pubmed
pubmed-article:10679281pubmed:affiliationNational Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India.lld:pubmed
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