The isolation and culture of endothelial colony-forming cells from human and rat lungs View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2015-11

AUTHORS

Rajesh S Alphonse, Arul Vadivel, Shumei Zhong, Suzanne McConaghy, Robin Ohls, Mervin C Yoder, Bernard Thébaud

ABSTRACT

Blood vessels are crucial for the normal development, lifelong repair and homeostasis of tissues. Recently, vascular progenitor cell-driven 'postnatal vasculogenesis' has been suggested as an important mechanism that contributes to new blood vessel formation and organ repair. Among several described progenitor cell types that contribute to blood vessel formation, endothelial colony-forming cells (ECFCs) have received widespread attention as lineage-specific 'true' vascular progenitors. Here we describe a protocol for the isolation of pulmonary microvascular ECFCs from human and rat lung tissue. Our technique takes advantage of an earlier protocol for the isolation of circulating ECFCs from the mononuclear cellular fraction of peripheral blood. We adapted the earlier protocol to isolate resident ECFCs from the distal lung tissue. After enzymatic dispersion of rat or human lung samples into a cellular suspension, CD31-expressing cells are positively selected using magnetic-activated cell sorting and plated in endothelial-specific growth conditions. The colonies arising after 1-2 weeks in culture are carefully separated and expanded to yield pure ECFC cultures after a further 2-3 weeks. The resulting cells demonstrate the defining characteristics of ECFCs such as (i) 'cobblestone' morphology of cultured cell monolayers; (ii) acetylated low-density lipoprotein uptake and Ulex europaeus lectin binding; (iii) tube-like network formation in Matrigel; (iv) expression of endothelial cell-specific surface markers and the absence of hematopoietic or myeloid surface antigens; (v) self-renewal potential displayed by the most proliferative cells; and (vi) contribution to de novo vessel formation in an in vivo mouse implant model. Assuming typical initial cell adhesion and proliferation rates, the entire procedure can be completed within 4 weeks. Isolation and culture of lung vascular ECFCs will allow assessment of the functional state of these cells in experimental and human lung diseases, providing newer insights into their pathophysiological mechanisms. More... »

PAGES

1697-1708

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nprot.2015.107

DOI

http://dx.doi.org/10.1038/nprot.2015.107

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26448359


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41 schema:description Blood vessels are crucial for the normal development, lifelong repair and homeostasis of tissues. Recently, vascular progenitor cell-driven 'postnatal vasculogenesis' has been suggested as an important mechanism that contributes to new blood vessel formation and organ repair. Among several described progenitor cell types that contribute to blood vessel formation, endothelial colony-forming cells (ECFCs) have received widespread attention as lineage-specific 'true' vascular progenitors. Here we describe a protocol for the isolation of pulmonary microvascular ECFCs from human and rat lung tissue. Our technique takes advantage of an earlier protocol for the isolation of circulating ECFCs from the mononuclear cellular fraction of peripheral blood. We adapted the earlier protocol to isolate resident ECFCs from the distal lung tissue. After enzymatic dispersion of rat or human lung samples into a cellular suspension, CD31-expressing cells are positively selected using magnetic-activated cell sorting and plated in endothelial-specific growth conditions. The colonies arising after 1-2 weeks in culture are carefully separated and expanded to yield pure ECFC cultures after a further 2-3 weeks. The resulting cells demonstrate the defining characteristics of ECFCs such as (i) 'cobblestone' morphology of cultured cell monolayers; (ii) acetylated low-density lipoprotein uptake and Ulex europaeus lectin binding; (iii) tube-like network formation in Matrigel; (iv) expression of endothelial cell-specific surface markers and the absence of hematopoietic or myeloid surface antigens; (v) self-renewal potential displayed by the most proliferative cells; and (vi) contribution to de novo vessel formation in an in vivo mouse implant model. Assuming typical initial cell adhesion and proliferation rates, the entire procedure can be completed within 4 weeks. Isolation and culture of lung vascular ECFCs will allow assessment of the functional state of these cells in experimental and human lung diseases, providing newer insights into their pathophysiological mechanisms.
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