Tag Archive for 'Research'

Scientists Develop Technique to Determine Ethnic Origin of Stem Cell Lines

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An international team of scientists led by researchers at The Scripps Research Institute has developed a straightforward technique to determine the ethnic origin of stem cells.

The team’s analysis of a variety of human embryonic stem cell lines currently in use in research laboratories around the world found that these cells originated largely from Caucasian and East Asian populations, with little representation from populations originating in Africa. In response to these results, the scientists used skin cells from an individual of West African Yoruba heritage to create a new stem cell line, the first to carry the genetic profile of this ethnic group.

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Human Lung Stem Cell Discovered

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Human Lung Stem Cell Discovered For the first time, researchers at Brigham and Women’s Hospital (BWH) have identified a human lung stem cell that is self-renewing and capable of forming and integrating multiple biological structures of the lung including bronchioles, alveoli and pulmonary vessels.  This research is published in the May 12, 2011 issue of the New England Journal of Medicine.

“This research describes, for the first time, a true human lung stem cell.  The discovery of this stem cell has the potential to offer those who suffer from chronic lung diseases a totally novel treatment option by regenerating or repairing damaged areas of the lung,” said Piero Anversa, MD, director of the Center for Regenerative Medicine at Brigham and Women’s Hospital and corresponding author.

Using lung tissue from surgical samples, researchers identified and isolated the human lung stem cell and tested the functionality of the stem cell both in vitro and in vivo.  Once the stem cell was isolated, researchers demonstrated in vitro that the cell was capable of dividing both into new stem cells and also into cells that would grow into various types of lung tissue.  Next, researchers injected the stem cell into mice with damaged lungs.  The injected stem cells differentiated into new bronchioles, alveoli and pulmonary vessel cells which not only formed new lung tissue, but also integrated structurally to the existing lung tissue in the mice.

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USA approves first ‘ethical’ human stem cell lines for research

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The U.S. government approved the first 13 batches of human embryonic stem cells on Wednesday, enabling researchers using them to get millions of dollars in federal funding as promised by President Barack Obama in March.

“Today we are announcing the approval of the first 13 stem cell lines,” Collins told reporters in a telephone briefing.

In March, Obama lifted restrictions on human embryonic stem cell research imposed by his predecessor, George W. Bush.

He could not lift a restriction set by Congress, called the Dickey-Wicker amendment, that forbids the use of federal money to make the stem cells, which require destruction of a human embryo. But the decision made it possible for researchers to use federal funds to work with cells that others have made.

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Now, a new tool to examine cancer growth

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Scientists have developed a new tool that illuminates connections between stem cells and cancer.
Researchers have been successful in breaking apart human prostate tissue, extract the stem cells in the tissue, and alter those cells genetically so that they spur cancer.

Many tissues contain pools of stem cells that replenish the tissue when it’s damaged or when changes take place. For example, stem cells in the skin produce new cells to replace those irreparably damaged by the sun, and stem cells in the breast create milk-producing cells when a woman is pregnant.

A characteristic of these stem cells is that they self-renew. This means that in addition to making cells with a specific function, they also make many new stem cells.

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UWM researcher makes breakthrough in stem cell technology

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UW-Milwaukee researcher Andrew Cohen has successfully developed a software program that facilitates predicting the evolution of stem cells. The program essentially speeds up what has been a tedious process for researchers in the past.

The program was published last week in the journal Nature Methods. It applies algorithmic information theory to the growth and movement of stem cells tracked over time to show what type of cells (i.e. brain, skin, etc.) they will eventually develop into.

“People look at images and take measurements by hand,” Cohen explained. “It takes a long time, and using computers makes the process a lot less tedious.”

Stem cells all start out the same before they develop into the different cells of our bodies. Scientists do not know what triggers the stem cell’s future growth pattern into a particular type of cell, but researchers like Cohen are figuring out how to predict the cell’s future based on measurements and math.

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Stem cells used to treat blindness

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Cultured stem cells from eyes helped improve the sight of eight patients with Limbal Stem Cell Deficiency, a painful, blinding disease, British doctors said.

The patients’ own corneal cells were cultured and used to reduce corneal cloudiness from the disease, The North East England Stem Cell Institute, Newcastle, England, reported in a release Thursday.

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