Navigation Links
New type of human stem cell may be more easy to manipulate
Date:6/8/2010

Researchers from the Massachusetts General Hospital Center for Regenerative Medicine (MGH-CRM) and the Harvard Stem Cell Institute have a developed a new type of human pluripotent stem cell that can be manipulated more readily than currently available stem cells. As described in the June 4 Cell Stem Cell, these new cells could be used to create better cellular models of disease processes and eventually may permit repair of disease-associated gene mutations.

"It has been fairly easy to manipulate stem cells from mice, but this has not been the case for traditional human stem cells," explains Niels Geijsen, PhD, of the MGH-CRM, who led the study. "We had previously found that the growth factors in which mouse stem cells are derived define what those cells can do, and now we've applied those findings to human stem cells."

The first mammalian embryonic stem cells (ESCs) were derived from mice and have proven very useful for studying gene function and the impact of changes to individual genes. But techniques used in these studies to introduce a different version of a single gene or inactivate a particular gene were ineffective in human ESCs. In addition, human ESCs proliferate much more slowly than do cells derived from mice and grow in flat, two-dimensional colonies, while mouse ESCs form tight, three-dimensional colonies. It is been extremely difficult to propagate human ESCs from a single cell, which prevents the creation of genetically manipulated human embryonic stem cell lines.

In previous work, Geijsen and his colleagues demonstrated that the growth factor conditions under which stem cells are maintained in culture play an important role in defining the cells' functional properties. Since the growth factors appeared to make such a difference, the researchers tried to make a more useful human pluripotent cell using a new approach. They derived human induced pluripotent stem cells (iPSCs) which are created by reprogramming adult cells and have many of the characteristics of human ECSs, including resistance to manipulation in cultures containing the growth factor LIF, which is used in the creation of mouse ESCs.

The resulting cells visibly resembled mouse ESCs and proved amenable to a standard gene manipulation technique that exchanges matching sequences of DNA, allowing the targeted deactivation or correction of a specific gene. The ability to manipulate these new cells depended on both the continued presence of LIF and expression of the five genes that are used in reprogramming adult cells into iPSCs. If any of those factors was removed, these hLR5- (for human LIF and five reprogramming factors) iPSCs reverted to standard iPSCs.

"Genetic changes introduced into hLR5-iPSCs would be retained when they are coverted back to iPSCs, which we then can use to generate cell lines for future research, drug development and someday stem-cell based gene-correction therapies," says Geijsen. He is an assistant professor of Medicine at Harvard Medical School and a principal faculty member of the Harvard Stem Cell Institute.


'/>"/>

Contact: Sue McGreevey
smcgreevey@partners.org
617-724-2764
Massachusetts General Hospital
Source:Eurekalert

Related biology news :

1. Forsyth scientists support the Human Microbiome Project
2. Some like it hot: Site of human evolution was scorching
3. East-African human ancestors lived in hot environments, says Caltech-led team
4. Scientists discover ancient viral invasion that shaped human genome
5. Innovative research reawakens human memories through intelligent textiles
6. New culture dish could advance human embryonic stem cell research
7. Powerful genome barcoding system reveals large-scale variation in human DNA
8. European Society of Human Reproduction and Embryology Annual Meeting
9. Early human habitat was savanna, not forest
10. UCI researchers create retina from human embryonic stem cells
11. Discovery of stem cell illuminates human brain evolution, points to therapies
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:11/28/2016)... "The biometric system market projected to ... system market is in the growth stage and is ... biometric system market is expected to be valued at ... 16.79% between 2016 and 2022. Government initiative in adoption ... rising use of biometric technology in financial institutes and ...
(Date:11/19/2016)... -- Securus Technologies, a leading provider of civil and ... and monitoring, announced today that it has offered a ... independent technology judge determine who has the largest and ... calling platform, and the best customer service. ... what we do – which clearly is not the ...
(Date:11/15/2016)... 15, 2016 Research and Markets has announced ... 2021" report to their offering. ... ... by 2021 from USD 6.21 Billion in 2016, growing at a ... of the bioinformatics market is driven by the growing demand for ...
Breaking Biology News(10 mins):
(Date:12/6/2016)... PUNE, India , December 6, 2016 ... (Microfluidic Chips, Micropump, Microneedle), Material (Polymer, Glass, Silicon), Application (Genomics, Proteomics, ... 2021", published by MarketsandMarkets, the global market is projected to reach ... at a CAGR of 19.2% during the forecast period (2016 to ... ...
(Date:12/6/2016)... -- The Texas Medical Center (TMC) and the ... announced the establishment of a new international BioBridge, a ... and the Texas Medical Center, the largest ... and the Texas Medical Center, with the support of ... health innovation ecosystem where emerging technologies can be developed, ...
(Date:12/5/2016)... (PRWEB) , ... December 05, 2016 , ... ... nanocellulose, including both cellulose nanocrystals and cellulose nanofibrils. The composition claims are ... There are also claims directed to combination with polymers, carbon fibers, graphene, and ...
(Date:12/5/2016)... CHICAGO , December 5, 2016 ... report, "Cell Expansion Market, by Products (Consumable, Instruments, ... Applications (Regenerative Medicine and Stem Cell Research, Cancer, ... Research Institutes, Cell Banks) - Global Revenue, Trends, ... by Scalar Market Research, the global cell expansion ...
Breaking Biology Technology: