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Evidence of in vitro differential secretion of 72 and 92 kDa type IV collagenases after selective exposure to lipopolysaccharide in human fetal membranes.

Abstract
Premature rupture of chorioamniotic membranes complicated with intrauterine infection has been associated to degradation of extracellular matrix (ECM), which could explain local morphological changes. We used a culture system in which the chorioamniotic membranes form two independent chambers, allowing for the selective stimulation of either the amnion (AMN) and/or the choriodecidua (CHD) regions. Lipopolysaccharide (500 ng/ml) was added to the AMN and/or the CHD; secretions and gelatinolytic activity of matrix metalloproteinase (MMP)-2 and MMP-9 were measured in both compartments by enzyme-linked immunosorbent assay (ELISA) and zymography. Secretions of TIMP-1, TIMP-2 and TIMP-4 were measured by ELISA. Both metalloproteinases were immunolocalized in tissue sections. All stimulation modalities induced a similar proMMP-2 and proMMP-9 secretion pattern in the CHD with concentrations of 2.49 ng/ml and 90.91 pg/ml, respectively; the AMN showed no significant changes. The active forms of both enzymes did not change with any stimulation modality. TIMP-1, TIMP-2 and TIMP-4 secretions remained without significant changes (P = 0.41). ECM degradation and structural disarrangement were evident after stimulation. Secretion of proMMP-2 and proMMP-9 mainly in the CHD, presence of active forms associated to the tissue and minor changes in TIMPs secretion could favor ECM degradation and explain the weakening and thinning associated with the pathological rupture of chorioamniotic membranes.
AuthorsGuadalupe Garcia-Lopez, Felipe Vadillo-Ortega, Horacio Merchant-Larios, Rolando Maida-Claros, Mauricio Osorio, Diana Soriano-Becerril, Hector Flores-Herrera, Jorge Beltran-Montoya, Yonathan Garfias-Becerra, Verónica Zaga-Clavellina
JournalMolecular human reproduction (Mol Hum Reprod) Vol. 13 Issue 6 Pg. 409-18 (Jun 2007) ISSN: 1360-9947 [Print] England
PMID17449536 (Publication Type: Journal Article)
Chemical References
  • Lipopolysaccharides
  • Tissue Inhibitor of Metalloproteinase-1
  • Tissue Inhibitor of Metalloproteinases
  • tissue inhibitor of metalloproteinase-4
  • Tissue Inhibitor of Metalloproteinase-2
  • Matrix Metalloproteinase 2
  • Matrix Metalloproteinase 9
Topics
  • Amnion (drug effects, enzymology, ultrastructure)
  • Decidua (drug effects, enzymology, ultrastructure)
  • Enzyme-Linked Immunosorbent Assay
  • Extracellular Matrix (metabolism)
  • Extraembryonic Membranes (drug effects, enzymology, ultrastructure)
  • Female
  • Humans
  • Lipopolysaccharides (pharmacology)
  • Matrix Metalloproteinase 2 (metabolism)
  • Matrix Metalloproteinase 9 (metabolism)
  • Tissue Inhibitor of Metalloproteinase-1 (metabolism)
  • Tissue Inhibitor of Metalloproteinase-2 (metabolism)
  • Tissue Inhibitor of Metalloproteinases (metabolism)

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