Effect of cytofectins on the immune response of murine macrophages to mammalian DNA.

Journal Article (Journal Article)

DNA, depending on base sequence, can induce a wide range of immune responses. While bacterial DNA is stimulatory, mammalian DNA is inactive alone and can, moreover, inhibit the response to bacterial DNA. To determine whether the mode of cell entry affects the immune properties of mammalian DNA, we have investigated the effects of the cytofectin agents Fugene 6 (Roche Diagnostics Corp., Indianapolis, IN), Lipofectin and Lipofectamine (Life Technologies, Grand Island, NY) on the responses of murine macrophages to DNA from calf thymus and human placenta. Whereas calf thymus and human placenta DNA alone failed to stimulate J774 or RAW264.7 cell lines or bone marrow-derived macrophages, these DNAs in complexes with cytofectin agents stimulated macrophages to produce nitric oxide but not interleukin 12. Both single-stranded and double-stranded DNAs were active in the presence of cytofectins. Macrophage activation by the DNA-cytofectin complexes was reduced by chloroquine, suggesting a role of endosomal acidification in activation. As shown by flow cytometry and confocal microscopy, the cytofectins caused an increase in the uptake of DNA into cells. Our findings indicate that macrophages vary in their response to DNA depending on uptake pathway, suggesting that activation by DNA reflects not only sequence but also context or intracellular location.

Full Text

Duke Authors

Cited Authors

  • Zhu, F-G; Reich, CF; Pisetsky, DS

Published Date

  • June 2003

Published In

Volume / Issue

  • 109 / 2

Start / End Page

  • 255 - 262

PubMed ID

  • 12757621

Pubmed Central ID

  • PMC1782966

International Standard Serial Number (ISSN)

  • 0019-2805

Digital Object Identifier (DOI)

  • 10.1046/j.1365-2567.2003.01653.x


  • eng

Conference Location

  • England