Linked Life Data

18177424

Source:http://linkedlifedata.com/resource/pubmed/id/18177424

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2008-8-28
pubmed:abstractText
The neovascularization of tissues is accomplished by two distinct processes: de novo formation of blood vessels through the assembly of progenitor cells during early prenatal development (vasculogenesis), and expansion of a pre-existing vascular network by endothelial cell sprouting (angiogenesis), the main mechanism of blood vessel growth in postnatal life. Evidence exists that adult bone marrow (BM)-derived progenitor cells can contribute to the formation of new vessels by their incorporation into sites of active angiogenesis. Aim of this study was to investigate the in vitro self-organizing capacity of human BM mononuclear cells (BMMNC) to induce vascular morphogenesis in a three-dimensional (3D) matrix environment in the absence of pre-existing vessels. Whole BMMNC as well as the adherent and non-adherent fractions of BMMNC were embedded in fibrin gels and cultured for 3-4 weeks without additional growth factors. The expression of hematopoietic-, endothelial-, smooth muscle lineage, and stem cell markers was analyzed by immunohistochemistry and confocal laser-scanning microscopy. The culture of unselected BMMNC in 3D fibrin matrices led to the formation of cell clusters expressing the endothelial progenitor cell (EPC) markers CD133, CD34, vascular endothelial growth factor receptor (VEGFR)-2, and c-kit, with stellar shaped spreading of peripheral elongated cells forming tube-like structures with increasing complexity over time. Cluster formation was dependent on the presence of both adherent and non-adherent BMMNC without the requirement of external growth factors. Developed vascular structures expressed the endothelial markers CD34, VEGFR-2, CD31, von Willebrand Factor (vWF), and podocalyxin, showed basement-membrane-lined lumina containing CD45+ cells and were surrounded by alpha-smooth muscle actin (SMA) expressing mural cells. Our data demonstrate that adult human BM progenitor cells can induce a dynamic self organization process to create vascular structures within avascular 3D fibrin matrices suggesting a possible alternative mechanism of adult vascular development without involvement of pre-existing vascular structures.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
1432-0436
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
76
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
772-83
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Vascular morphogenesis by adult bone marrow progenitor cells in three-dimensional fibrin matrices.
pubmed:affiliation
Department of Transfusion Medicine, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria. beate.rueger@meduniwien.ac.at
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't