Effects of deletion of the matrix metalloproteinase 9 gene on development of murine thoracic aortic aneurysms

John S. Ikonomidis, John R. Barbour, Zainab Amani, Robert E. Stroud, Amanda R. Herron, David M. McClister, Sarah E. Camens, Merry L. Lindsey, Rupak Mukherjee, Francis G. Spinale

Research output: Contribution to journalArticle

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Abstract

Background - The matrix metalloproteinases (MMPs) contribute to cardiovascular remodeling, and MMPs, such as the gelatinases (MMP-9 and MMP-2), have been identified in thoracic aortic aneurysmal (TAA) tissue, but a cause-effect relationship has not been clearly established. Accordingly, this study examined TAA progression in mice devoid of the MMP-9 gene. Methods and Results - The descending thoracic aortas of wild-type (WT) FVB (n = 17) and MMP-9 gene knockout (KO, n = 11) mice were exposed to 0.5 mol/L of CaCl 2 for 15 minutes with terminal studies performed at 4 weeks. Aortic lumen diameter was measured using video micrometry at baseline and at 4 weeks (TAA) followed by aortic tissue analysis. In WT mice, aortic diameter increased by 138±5% at 4 weeks (P<0.05), consistent with TAA formation. In the KO mice, aortic diameter increased from baseline by 120±4% (P<0.05) but was attenuated from WT TAA values (P<0.05). Gelatin zymography performed on TAA segments confirmed the absence of MMP-9 in the KO mice but a >8-fold relative increase in the active form of MMP-2 compared with WT (P<0.05). Despite this, MMP-2 activity was relatively increased (P<0.05) and colocalized to smooth muscle cell actin in a differential pattern favoring medial distruction in the WT TAA compared with the KO TAA segments. Conclusions - These results demonstrate that MMP-9 gene deletion attenuated TAA formation despite an increase in the zymographic levels of MMP-2. These unique findings suggest that an interaction between these 2 MMPs is necessary to facilitate TAA progression.

Original languageEnglish (US)
Pages (from-to)I242-I248
JournalCirculation
Volume112
Issue number9 SUPPL.
DOIs
StatePublished - Aug 30 2005

Fingerprint

Thoracic Aortic Aneurysm
Matrix Metalloproteinase 9
Matrix Metalloproteinase 2
Thorax
Genes
Matrix Metalloproteinases
Thoracic Aorta
Gelatinases
Gene Knockout Techniques
Gene Deletion
Smooth Muscle Myocytes
Actins

Keywords

  • Aneurysm
  • Aorta
  • MMP-2
  • MMP-9
  • Thorax

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

Ikonomidis, J. S., Barbour, J. R., Amani, Z., Stroud, R. E., Herron, A. R., McClister, D. M., ... Spinale, F. G. (2005). Effects of deletion of the matrix metalloproteinase 9 gene on development of murine thoracic aortic aneurysms. Circulation, 112(9 SUPPL.), I242-I248. https://doi.org/10.1161/CIRCULATIONAHA.104.526152

Effects of deletion of the matrix metalloproteinase 9 gene on development of murine thoracic aortic aneurysms. / Ikonomidis, John S.; Barbour, John R.; Amani, Zainab; Stroud, Robert E.; Herron, Amanda R.; McClister, David M.; Camens, Sarah E.; Lindsey, Merry L.; Mukherjee, Rupak; Spinale, Francis G.

In: Circulation, Vol. 112, No. 9 SUPPL., 30.08.2005, p. I242-I248.

Research output: Contribution to journalArticle

Ikonomidis, JS, Barbour, JR, Amani, Z, Stroud, RE, Herron, AR, McClister, DM, Camens, SE, Lindsey, ML, Mukherjee, R & Spinale, FG 2005, 'Effects of deletion of the matrix metalloproteinase 9 gene on development of murine thoracic aortic aneurysms', Circulation, vol. 112, no. 9 SUPPL., pp. I242-I248. https://doi.org/10.1161/CIRCULATIONAHA.104.526152
Ikonomidis JS, Barbour JR, Amani Z, Stroud RE, Herron AR, McClister DM et al. Effects of deletion of the matrix metalloproteinase 9 gene on development of murine thoracic aortic aneurysms. Circulation. 2005 Aug 30;112(9 SUPPL.):I242-I248. https://doi.org/10.1161/CIRCULATIONAHA.104.526152
Ikonomidis, John S. ; Barbour, John R. ; Amani, Zainab ; Stroud, Robert E. ; Herron, Amanda R. ; McClister, David M. ; Camens, Sarah E. ; Lindsey, Merry L. ; Mukherjee, Rupak ; Spinale, Francis G. / Effects of deletion of the matrix metalloproteinase 9 gene on development of murine thoracic aortic aneurysms. In: Circulation. 2005 ; Vol. 112, No. 9 SUPPL. pp. I242-I248.
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AU - Herron, Amanda R.

AU - McClister, David M.

AU - Camens, Sarah E.

AU - Lindsey, Merry L.

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