Journals Arteriosclerosis, Thrombosis, and Vascular Biology
Name
Arteriosclerosis, Thrombosis, and Vascular Biology
Subjects
Vascular biology
Proteolytic enzymes
Proteomics
Vascular muscle
Extracellular matrix
Engiogenesis
Proteolytic enzymes
Proteomics
Vascular muscle
Extracellular matrix
Engiogenesis
ISSN
1079-5642
Description
Objective— Recent studies on cardiovascular progenitors have led to a new appreciation that paracrine factors may support the regeneration of damaged tissues. Methods and Results— We used a shotgun proteomics strategy to compare the secretome of peripheral blood–derived smooth muscle progenitors (SPCs) with human aortic smooth muscle cells. The late-outgrowth SPCs produced fewer proteolytic enzymes and inflammatory cytokines and showed reduced invasive capacity. Similar to smooth muscle cells, SPCs secreted extracellular matrix. However, SPCs produced different matrix proteins, as evidenced by the truncation of proangiogenic domains in collagen α-1 (I) and increased production of periostin. Moreover, SPCs retained serum proteins, including proteoglycans, regulating collagen assembly; and pigment epithelium–derived factor, a potent inhibitor of angiogenesis. As a functional consequence, their conditioned medium was less angiogenic, as demonstrated by endothelial tube formation assays in vitro and implantation of Matrigel plugs into nude, severe combined immunodeficient mice (NOD/SCID).
Publisher
Lippincott & Williams Company
Journal Webpage
Journal type
Open Access