The fibrinolytic system in dissemination and matrix protein deposition during a mycobacterium infection.

Abstract

The fibrinolytic system is known to play an important role in the inflammatory response to bacterial infections. In the present study, relationships between protein components of the fibrinolytic system and infectivity by Mycobacterium avium were analyzed. Infections were initiated through noninvasive intratracheal administration of M. avium 724 in mice individually deficient for plasminogen, tissue-type plasminogen activator, urokinase-type plasminogen activator, and urokinase-type plasminogen activator receptor, along with wild-type control mice. There were no differences in lung colony counts among all mouse genotypes throughout a 10-week infection. However, in tissue-type plasminogen activator and plasminogen-deficient mice an earlier dissemination of M. avium to other organs was observed. Nevertheless, the M. avium growth rates in the liver, spleen, and lung did not differ between the various mouse populations throughout a 10-week infection. Histochemical and immunohistochemical analyses at 5 and 10 weeks after infection demonstrated that plasminogen-deficient mice, compared to wild-type mice, had enhanced fibrin and fibronectin deposition, as well as increased neutrophil infiltration within liver granulomas. These results suggest that plasmin(ogen) plays a role in the turnover of extracellular matrix proteins within granulomas and has a limited effect in the early dissemination of M. avium from lungs. Thus, plasmin(ogen) functions in limiting progressive fibrosis in the granuloma during a chronic mycobacterial infection.

• Authors: Jun Sato, Jeffrey Schorey, Victoria A Ploplis, Erijka Haalboom, Liana Krahule, Francis J Castellino
• Journal: The American journal of pathology (Am J Pathol) Vol. 163 Issue 2 Pg. 517-31 (Aug 2003) ISSN: 0002-9440 [Print] United States
• PMID: 12875972 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Cytokines
• Extracellular Matrix Proteins
• Fibronectins
• Plaur protein, mouse
• Receptors, Cell Surface
• Receptors, Urokinase Plasminogen Activator
• Fibrin
• Plasminogen Activators
• Tissue Plasminogen Activator
• Urokinase-Type Plasminogen Activator

Topics

• Animals
• Colony Count, Microbial
• Cytokines (metabolism)
• Extracellular Matrix Proteins (metabolism)
• Fibrin (metabolism)
• Fibrinolysis (physiology)
• Fibronectins (metabolism)
• Liver (microbiology, pathology)
• Lung (microbiology, pathology)
• Mice
• Mice, Inbred C57BL
• Mice, Knockout
• Mycobacterium avium Complex (growth & development)
• Mycobacterium avium-intracellulare Infection (metabolism, microbiology, pathology)
• Mycobacterium bovis (growth & development)
• Neutrophils (cytology, metabolism)
• Plasminogen Activators (genetics, metabolism)
• Receptors, Cell Surface (genetics, metabolism)
• Receptors, Urokinase Plasminogen Activator
• Spleen (microbiology, pathology)
• Tissue Plasminogen Activator (genetics, metabolism)
• Tuberculosis (metabolism, microbiology, pathology)
• Urokinase-Type Plasminogen Activator (genetics, metabolism)