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It is generally accepted that angiogenesis is delayed in aging. To define the effects of age on the neovascular response, polyvinyl alcohol sponges were implanted SC in young (6-8 months old, n=11) and aged (23-25 months old, n=13) mice and sampled at 14 and 19 days. Angiogenic invasion was significantly delayed in aged mice at 14d relative to young at 14d(More)
This article considers the precision positioning problem associated with high-speed operation of the Atomic Force Microscope (AFM), and presents an inversion-based control approach to achieve precision positioning. Although AFMs have high (nanoscale) spatial resolution, a problem with current AFM systems is that they have low temporal resolution, i.e., AFM(More)
Matrix metalloproteinases (MMPs) and their specific inhibitors the TIMPs play significant roles in angiogenesis. We investigated how the expression of specific MMPs and TIMPs by human microvascular endothelial cells (hmECs) was modulated by culture of the cells in 3-dimensional (3D) type I collagen gels versus 2-dimensional (2D) collagen-coated surfaces. By(More)
Factors responsible for age-associated impairment of angiogenesis are poorly understood. We observed that in aged mice, new fibrovascular tissue within subcutaneous polyvinyl alcohol sponges expressed more tissue inhibitor of metalloproteinases (TIMP)-2 than did corresponding tissue from young mice. In complementary studies in vitro, we utilized young and(More)
Analysis of SP and NKA metabolism by human vascular endothelium, relative to that in human plasma, identified integrative, multiple pathways for the processing of circulating SP (but not NKA) by angiotensin-converting enzyme (ACE; EC, dipeptidyl(amino)peptidase IV (DAP IV; EC, and aminopeptidase M (AmM; EC In contrast, SP and(More)
Neovascular invasion into a 3-dimensional matrix is controlled, in part, by matrix metalloproteinases (MMPs) and their inhibitors, tissue inhibitors of metalloproteinases (TIMPs). We tested the hypothesis that increasing MMP activity, via a specific blocking antibody to TIMP1, would enhance fibrovascular invasion into a PVA sponge. In vivo, inhibition of(More)
Angiogenesis, the formation of new vessels from pre-existing vasculature, is impaired in aging. This is due, in part, to a lack of regulatory molecules such as nitric oxide (NO). We wished to test the hypothesis that there are deficits in the pathways that mediate NO production during angiogenesis (as defined by fibrovascular invasion into a polyvinyl(More)
OBJECTIVE The present study describes the distribution of atherosclerotic lesions in the coronary arteries of chow-fed 60-week-old male ApoE(-/-), 17-beta-estradiol-treated ApoE(-/-), and wild-type mice. METHODS AND RESULTS The histologic examination of coronary arteries in 12 ApoE(-/-) and 6 wild-type mice, in contrast to the distribution of(More)
The impairment of angiogenesis in aging has been attributed, in part, to alterations in proteins associated with the extracellular matrix (ECM). SPARC (secreted protein acidic and rich in cysteine/osteonectin/BM-40) is a matricellular protein that regulates endothelial cell function as well as cell-ECM interactions. We have previously shown that(More)
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