[HTML][HTML] Membrane type 1 matrix metalloproteinase regulates monocyte migration and collagen destruction in tuberculosis

T Sathyamoorthy, LB Tezera, NF Walker… - The Journal of …, 2015 - journals.aai.org
T Sathyamoorthy, LB Tezera, NF Walker, S Brilha, L Saraiva, FA Mauri, RJ Wilkinson
The Journal of Immunology, 2015journals.aai.org
Tuberculosis (TB) remains a global pandemic and drug resistance is rising. Multicellular
granuloma formation is the pathological hallmark of Mycobacterium tuberculosis infection.
The membrane type 1 matrix metalloproteinase (MT1-MMP or MMP-14) is a collagenase
that is key in leukocyte migration and collagen destruction. In patients with TB, induced
sputum MT1-MMP mRNA levels were increased 5.1-fold compared with matched controls
and correlated positively with extent of lung infiltration on chest radiographs (r= 0.483; p< …
Abstract
Tuberculosis (TB) remains a global pandemic and drug resistance is rising. Multicellular granuloma formation is the pathological hallmark of Mycobacterium tuberculosis infection. The membrane type 1 matrix metalloproteinase (MT1-MMP or MMP-14) is a collagenase that is key in leukocyte migration and collagen destruction. In patients with TB, induced sputum MT1-MMP mRNA levels were increased 5.1-fold compared with matched controls and correlated positively with extent of lung infiltration on chest radiographs (r= 0.483; p< 0.05). M. tuberculosis infection of primary human monocytes increased MT1-MMP surface expression 31.7-fold and gene expression 24.5-fold. M. tuberculosis–infected monocytes degraded collagen matrix in an MT1-MMP–dependent manner, and MT1-MMP neutralization decreased collagen degradation by 73%. In human TB granulomas, MT1-MMP immunoreactivity was observed in macrophages throughout the granuloma. Monocyte–monocyte networks caused a 17.5-fold increase in MT1-MMP surface expression dependent on p38 MAPK and G protein–coupled receptor-dependent signaling. Monocytes migrating toward agarose beads impregnated with conditioned media from M. tuberculosis–infected monocytes expressed MT1-MMP. Neutralization of MT1-MMP activity decreased this M. tuberculosis network–dependent monocyte migration by 44%. Taken together, we demonstrate that MT1-MMP is central to two key elements of TB pathogenesis, causing collagen degradation and regulating monocyte migration.
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