These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Engagement of Toll-like receptor 2 in mouse macrophages infected with Mycobacterium avium induces non-oxidative and TNF-independent anti-mycobacterial activity.
    Author: Gomes MS, Sousa Fernandes S, Cordeiro JV, Silva Gomes S, Vieira A, Appelberg R.
    Journal: Eur J Immunol; 2008 Aug; 38(8):2180-9. PubMed ID: 18624355.
    Abstract:
    Toll-like receptor (TLR) 2 plays an important role in the immune response to mycobacterial infections, being required for optimal immunity against certain virulent Mycobacterium avium strains. Here we analyzed the role of TLR2 in the intra-macrophagic growth of M. avium, using macrophages from TLR2-deficient mice. We found that the engagement of TLR2/TLR6 and/or TLR2/TLR1 receptors induced bacteriostasis of M. avium inside bone marrow-derived macrophages in a MyD88-dependent way. Additionally, lipoproteins from the cell envelope of M. avium with a molecular mass of 20-25 kDa triggered this TLR2 pathway, leading to a decrease in the growth of the mycobacteria. Although TLR2 engagement induced the production of TNF, this cytokine as well as nitric oxide and superoxide molecules were not necessary for TLR2-mediated bacteriostasis. Finally, TLR ligation did not induce the expression of the 47-kDa guanosine triphosphatase (LRG-47) but it promoted an increased maturation of the phagosome with regards to acquisition of LAMP1. Our data show that triggering TLR2 inhibited M. avium growth by an as-yet-unknown mechanism that may involve increased phagosome maturation.
    [Abstract] [Full Text] [Related] [New Search]