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Matrix Metalloproteinase-28 Deletion Amplifies Inflammatory and Extracellular Matrix Responses to Cardiac Aging

  • Yonggang Ma (a1) (a2), Ying Ann Chiao (a1) (a2) (a3), Jianhua Zhang (a1) (a2), Anne M. Manicone (a4), Yu-Fang Jin (a5) and Merry L. Lindsey (a1) (a2)...

To determine if matrix metalloproteinase (MMP)-28 mediates cardiac aging, wild-type (WT) and MMP-28−/− young (7 ± 1 months, n = 9 each) and old (20 ± 2 months, n = 7 each) female mice were evaluated. MMP-28 expression in the left ventricle (LV) increased 42% in old WT mice compared to young controls (p < 0.05). By Doppler echocardiography, LV function declined at 20 ± 2 months of age for both groups. However, dobutamine stress responses were similar, indicating that cardiac reserve was maintained. Plasma proteomic profiling revealed that macrophage inflammatory protein (MIP)-1 α, MIP-1β and MMP-9 plasma levels did not change in WT old mice but were significantly elevated in MMP-28−/− old mice (all p < 0.05), suggestive of a higher inflammatory status when MMP-28 is deleted. RT2-PCR gene array and immunoblotting analyses demonstrated that MIP-1α and MMP-9 gene and protein levels in the LV were also higher in MMP-28−/− old mice (all p < 0.05). Macrophage numbers in the LV increased similarly in WT and MMP-28−/− old mice, compared to respective young controls (both p < 0.05). Collagen content was not different among the WT and MMP-28−/− young and old mice. In conclusion, LV inflammation increases with age, and MMP-28 deletion further elevates inflammation and extracellular matrix responses, without altering macrophage numbers or collagen content.

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Microscopy and Microanalysis
  • ISSN: 1431-9276
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