Immune control of tuberculosis by IFN-gamma-inducible LRG-47.

Journal Article (Journal Article)

Interferon-gamma (IFN-gamma) provides an essential component of immunity to tuberculosis by activating infected host macrophages to directly inhibit the replication of Mycobacterium tuberculosis (Mtb). IFN-gamma-inducible nitric oxide synthase 2 (NOS2) is considered a principal effector mechanism, although other pathways may also exist. Here, we identify one member of a newly emerging 47-kilodalton (p47) guanosine triphosphatase family, LRG-47, that acts independently of NOS2 to protect against disease. Mice lacking LRG-47 failed to control Mtb replication, unlike those missing the related p47 guanosine triphosphatases IRG-47 or IGTP. Defective bacterial killing in IFN-gamma-activated LRG-47-/- macrophages was associated with impaired maturation of Mtb-containing phagosomes, vesicles that otherwise recruited LRG-47 in wild-type cells. Thus, LRG-47 may serve as a critical vacuolar trafficking component used to dispose of intracellular pathogens like Mtb.

Full Text

Duke Authors

Cited Authors

  • MacMicking, JD; Taylor, GA; McKinney, JD

Published Date

  • October 24, 2003

Published In

Volume / Issue

  • 302 / 5645

Start / End Page

  • 654 - 659

PubMed ID

  • 14576437

Electronic International Standard Serial Number (EISSN)

  • 1095-9203

Digital Object Identifier (DOI)

  • 10.1126/science.1088063


  • eng

Conference Location

  • United States