Endothelial progenitor cell

Endothelial progenitor cell

Endothelial progenitor cells are bone marrow-derived cells that circulate in the blood and have the ability to differentiate into endothelial cells, the cells that make up the lining of blood vessels. The process by which blood vessels are born "de novo" from endothelial progenitor cells is known as vasculogenesis. Most of vasculogenesis occurs "in utero" during embryologic development. Endothelial progenitor cells found in adults are thus related to angioblasts, which are the stem cells that form blood vessels during embryogenesis. Endothelial progenitor cells are thought to participate in pathologic angiogenesis such as that found in retinopathy and tumor growth. While angioblasts have been known to exist for many years, adult endothelial progenitor cells were only characterized in the 1990s after Asahara and colleagues published that a purified population of CD34-expressing cells isolated from the blood of adult mice could differentiate into endothelial cells "in vitro". [cite journal | author = Asahara T, et al| title = Isolation of putative progenitor endothelial cells for angiogenesis | journal = Science | volume = 275 | pages = 964–7 | year = 1997 | pmid = 9020076| doi = 10.1126/science.275.5302.964 ] As endothelial progenitor cells are originally derived from the bone marrow, it is thought that various cytokines, growth factors, and hormones cause them to be mobilized from the bone marrow and into the peripheral circulation where they ultimately are recruited to regions of angiogenesis [cite journal | author = Asahara T, et al| title = Bone marrow origin of endothelial progenitor cells responsible for postnatal vasculogenesis in physiological and pathological neovascularization. | journal = Circulation Research | volume = 85 | issue = 6| pages = 221–8 | year = 1999 | pmid = 10436164 ] .

Endothelial Progenitor Cell Markers

*Endothelial progenitor cells are thought to express CD34, CD133, CD31, VE-cadherin, VEGFR2, and c-Kit. CD133 and CD34 are often used as markers for selection and purification of these cells because CD133 is not found on mature endothelial cells, and CD34 is not found on the undifferentiated stem cells from which endothelial progenitor cells derive. [cite journal | author = Hristov, et al| title = Endothelial progenitor cells: isolation and characterization. | journal = Trends in Cardiovascular Medicine | volume = 13 | issue = 5 | pages = 201–6 | year = 2003 | pmid = 12837583| doi = 10.1016/S1050-1738(03)00077-X ]
*There is emerging evidence that cells that express the combination of CD31, CD45, and Tie-2 may also be a population endothelial progenitor cells. [cite journal | author = Shaw J, et al| title = Hematopoietic stem cells and endothelial cell precursors express Tie-2, CD31 and CD45. | journal = Blood Cells, Molecules, and Diseases | volume = 32 | issue = 1 | pages = 168–75 | year = 2004 | pmid = 14757432| doi = 10.1016/j.bcmd.2003.10.003 ]

Relationship to Cardiovascular Outcomes

*There is evidence that circulating endothelial progenitor cells play a role in the repair of damaged blood vessels after a myocardial infarction. In fact, higher levels of circulating endothelial progenitor cells detected in the bloodstream predict for better outcomes and fewer repeat heart attacks. [cite journal | author = Werner N, et al| title = Circulating Endothelial Progenitor Cells and Cardiovascular Outcomes. | journal = New England Journal of Medicine | volume = 353 | pages = 999–1007 | year = 2005 | pmid = 16148285| doi = 10.1056/NEJMoa043814 ] It is hypothesized that endothelial progenitor cells are mobilized after a myocardial infarction, and that they function to restore the lining of blood vessels that are damaged during the heart attack. In a September 2007 news press release by Harvard University, Virna Sales, a researcher in cardiology and surgery at Boston Children's Hospital and Harvard University Medical School and John Mayer, Jr. who is an associate of Surgery Professor, discovered that adult endothelial progenitor stem cells could eventually (within 10 years) be scaffolded with supportive tissue to make pediatric heart valves- for better use in surgically treating cardiac defects.

References


Wikimedia Foundation. 2010.

См. также в других словарях:

  • Progenitor cell — The concept of a progenitor cell is difficult to define. Like stem cells, progenitor cells have a capacity to differentiate into a specific type of cell.cite web |url=http://cancerweb.ncl.ac.uk/cgi bin/omd?progenitor+cell |title=Definition:… …   Wikipedia

  • Cell potency — Pluripotent, embryonic stem cells originate as inner mass cells within a blastocyst. The stem cells can become any tissue in the body, excluding a placenta. Only the morula s cells are totipotent, able to become all tissues and a placenta. The… …   Wikipedia

  • Endothelial NOS — Nitric oxide synthase 3 (endothelial cell) Rendering of 1M9J …   Wikipedia

  • Hematopoietic stem cell — HSC=Hematopoietic stem cell, Progenitor=Progenitor cell, L blast=Lymphoblast, Lymphocyte, Mo blast=Monoblast, Monocyte, Myeloblast …   Wikipedia

  • Mesenchymal stem cell — showing typical ultrastructural morphology. Latin cellula mesenchymatica precursoria Code TH H2 …   Wikipedia

  • List of distinct cell types in the adult human body — There are about 210 distinct human cell types,.[1][2][3] There are between 50 and 75 trillion cells in the human body.[citation needed] Cell types can be classified by their tissue of origin. However, it is possible for some cells to have their… …   Wikipedia

  • Myosatellite cell — For the glial progenitor cells, see Satellite cell (glial). Myosatellite cell Latin myosatellitocytus Code TH H2.00.05.2.01020 Myosatellite cells or satellite cells are small mononuclear progenitor cells with virtually no cytoplasm found in… …   Wikipedia

  • Mural cell — The term mural cell refers generally to vascular smooth muscle cells and pericytes, both involved in the formation of normal vasculature and responsive to vascular endothelial growth factor (VEGF).[1] The weakness and disorganization of tumor… …   Wikipedia

  • Mesangial cell — Mesangial cells are specialized cells around blood vessels in the kidneys, at the mesangium. They are specialized smooth muscle cells that function to regulate blood flow through the capillaries, usually divided into two types, each having a very …   Wikipedia

  • Cardiac muscle cell — Latin cardiomyocytus; myocytus cardiacus Code TH H2.00.05.2.02004 A cardiac muscle cell or myocardiocyte (also known as cardiomyocyte[1] …   Wikipedia


Поделиться ссылкой на выделенное

Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»