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Fat tissue may be a source of valuable blood stem cells, study says
Date:1/27/2010

marrow tissues share similar properties, so we suspected that valuable stem cells might be found in the adipose regions, offering a unique resource for stem cells that might be easier and less costly to extract," said Dr. Koh.

Within the adipose tissue is a special cell population known as the stromal vascular fraction (SVF), which consists of other undefined stem cells as well as immune, endothelial (blood vessel lining), progenitor (undifferentiated or premature precursor cells), and stromal (connective tissue) cells. Cells in the SVF share similar properties to those in the bone marrow. Both contain a population of cells that have the ability to differentiate into several cell types. In addition, both adipose tissue and bone marrow offer similar environments for optimal stem cell growth and reproduction, including a smaller amount of circulating oxygen and specialized vascular systems as compared with other organs.

The research team characterized the HSPCs in the SVF of mouse adipose tissue with both in vitro and in vivo analyses. They studied the origin of the HSPCs to better predict their behavior and determine whether the quantity of cells could be increased by promoting more frequent HSPC movement between the bone marrow and peripheral blood using granulocyte colony-stimulating factor, or G-CSF, a growth hormone used to encourage development of stem cells. The team found that the more they could mobilize the HSPCs between the bone marrow and the peripheral blood, the more HSPCs they would find in the SVF.

The study results provide compelling evidence that the SVF derived from adipose tissue contains functional HSPCs capable of generating hematopoietic (blood-forming) cells. Importantly, researchers found that the cells were able to differentiate into a variety of hematopoietic cells when tracked for at least 16 weeks post-transplantation, which reflects long-term and permanent reconstitution of donor hematopoietic
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Contact: Patrick C. Irelan
pirelan@hematology.org
202-776-0544
American Society of Hematology
Source:Eurekalert

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