Exercise attenuates matrix metalloproteinase activity in preexisting atherosclerotic plaque
- Exercise attenuates matrix metalloproteinase activity in preexisting atherosclerotic plaque
- 손수민; 박종호; Matthias Nahrendorf; Dawid Schellingerhou; 김정연; 강병택; 정상욱; 김요진; 류주희; 김광명; 권익찬; 이동건; 이명묵; 김동억
- Exercise; Atherosclerosis; Matrix metalloproteinase; Preexisting plaque; Molecular imaging
- Issue Date
- VOL 216, NO 1, 67-73
- Objective :
Few studies have investigated if exercise by itself has anti-atherosclerotic effects, without combining interventions with a low-fat diet. We studied the effects of exercise as a stand-alone intervention on preexisting atheromata by measuring not only plaque size but also the levels of plaque-destabilizing matrix-metalloproteinase (MMP) activity in vivo.
Methods and results :
We used near-infrared fluorescent (NIRF) molecular imaging with an MMP-2/9 activatable NIRF probe to visualize the inflammatory protease activity within preexisting atheromata of 17-week-old ApoE−/− mice on: (a) normal chow diet (NCD), (b) Western diet (WD), and (c) WD with treadmill exercise for 10 weeks. We also measured tissue levels of aortic lipid peroxidation (LPO) and plasma levels of glucose/lipid/cytokine profiles. Exercise did not attenuate growth of preexisting atheromatous plaques. However, exercise strongly decreased proteolytic activity in plaques for animals on WD, with levels decreasing almost to NCD levels. Exercise was associated with decreased aortic LPO levels and increased blood adiponectin/leptin levels; however, exercise did not affect WD-consumption/weight-gain or improve blood glucose/lipid profiles.
Exercise training reduced aortic MMP activity in mice with preexisting atheromata, even though they remained on a high fat diet and plaque-growth was not attenuated.
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