In vivo matrix metalloproteinase-7 substrates identified in the left ventricle post-myocardial infarction using proteomics.
Matrix metalloproteinase-7 (MMP-7) deletion has been shown to improve survival after myocardial infarction (MI). MMP-7 has a large array of in vitro substrates, but in vivo substrates for MMP-7 following MI have not been fully identified. Accordingly, we evaluated the infarct regions of wild-type (WT; n = 12) and MMP-7 null (null; n = 10) mice using a proteomic strategy. Seven days post-MI, infarct regions of the left ventricles were excised, homogenized, and protein extracts were analyzed by two-dimensional gel electrophoresis and mass spectrometry. Of 13 spots that showed intensity differences between WT and null, the intensities of eight spots were higher and those of five spots were lower in the null group (p < 0.05). Fibronectin and tenascin-C, known in vitro substrates of MMP-7, were identified in spots that showed lower intensity in the null. Immunoblotting and in vitro cleavage assays confirmed reduced fibronectin and tenascin-C fragment generation in the null, and this effect was restored by exogenous administration of MMP-7. Lower levels of full-length peroxiredoxin-1 and -2 and higher levels of the full-length peroxiredoxin-3 were detected in the null group, suggesting MMP-7 deletion may also indirectly regulate protein levels through nonenzymatic mechanisms. In conclusion, this is the first study to identify fibronectin and tenascin-C as in vivo MMP-7 substrates in the infarcted left ventricle using a proteomic approach.
Department of Medicine, Division of Cardiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229, USA.
Ying Ann
YA
Chiao
Rogelio
R
Zamilpa
Elizabeth F
EF
Lopez
Qiuxia
Q
Dai
Gladys P
GP
Escobar
Kevin
K
Hakala
Susan T
ST
Weintraub
Merry L
ML
Lindsey
D000818:Animals; D015180:Electrophoresis, Gel, Two-Dimensional; D005353:Fibronectins / Q000032:analysis / Q000378:metabolism; D006352:Heart Ventricles / Q000033:anatomy & histology / Q000201:enzymology* / Q000473:pathology; D015151:Immunoblotting; D008297:Male; D013058:Mass Spectrometry; D020783:Matrix Metalloproteinase 7 / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009203:Myocardial Infarction / Q000201:enzymology*; D009206:Myocardium / Q000201:enzymology*; D054464:Peroxiredoxins / Q000032:analysis / Q000378:metabolism; D040901:Proteomics / Q000379:methods*; D019063:Tenascin / Q000032:analysis / Q000378:metabolism; D020257:Ventricular Remodeling / Q000502:physiology*
D005353:Fibronectins; D019063:Tenascin; D054464:Peroxiredoxins; D020783:Matrix Metalloproteinase 7