Corporate Banner
Satellite Banner
Stem Cells, Cellular Therapy & Biobanking
>
Scientific Community
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Discovery Could Keep Bad Stem Cells Out of Therapies

Published: Tuesday, April 23, 2013
Last Updated: Tuesday, April 23, 2013
Bookmark and Share
Some pluripotent stem cells fail to differentiate and end up mixed in with their newly differentiated daughter cells.

Because these remaining pluripotent stem cells can subsequently develop into unintended cell types — bone cells among blood, for instance — or form tumors known as teratomas, identifying and separating them from their differentiated progeny is of utmost importance in keeping stem cell-based therapeutics safe.

Now, UCLA scientists have discovered a new agent that may be useful in strategies to remove these cells. Their research was published online April 15 in the journal Developmental Cell and will appear in an upcoming print edition of the journal.

The study was led by Carla Koehler, a professor of chemistry and biochemistry at UCLA, and Dr. Michael Teitell, a UCLA professor of pathology and pediatrics. Both are members of the Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research at UCLA and UCLA's Jonsson Comprehensive Cancer Center.

In work using the single-celled microorganism known as baker's yeast, or Saccharomyces cerevisiae, as a model system, Koehler, Teitell and their colleagues had discovered a molecule called MitoBloCK-6, which inhibits the assembly of cells' mitochondria — the energy-producing "power plants" that drive most cell functions. The research team then tested the molecule in a more complex model organism, the zebrafish, and demonstrated that MitoBloCK-6 blocked cardiac development.

However, when the scientists introduced MitoBloCK-6 to differentiated cell lines, which are typically cultured in the lab, they found that the molecule had no effect at all. UCLA postdoctoral fellow Deepa Dabir tested the compound on many differentiated lines, but the results were always the same: The cells remained healthy.

"I was puzzled by this result, because we thought this pathway was essential for all cells, regardless of differentiation state," Koehler said.

The team then decided to test MitoBloCK-6 on human pluripotent stem cells. Postdoctoral fellow Kiyoko Setoguchi showed that MitoBloCK-6 caused the pluripotent stem cells to die by triggering apoptosis, a process of programmed cell suicide.

Because the tissue-specific daughter cells became resistant to death shortly after their differentiation, the destruction of the pluripotent stem cells left a population of only the differentiated cells. Why this happens is still unclear, but the researchers said that this ability to separate the two cell populations could potentially reduce the risk of teratomas and other problems in regenerative medicine treatment strategies.

"We discovered that pluripotent stem cell mitochondria undergo a change during differentiation into tissue-specific daughter cells, which could be the key to the survival of the differentiated cells when the samples are exposed to MitoBloCK-6," Teitell said. "We are still investigating this process in mitochondria, but we now know that mitochondria have an important role in controlling pluripotent stem cell survival."

MitoBloCK-6 is what is known as a "small molecule," which can easily cross cell membranes to reach mitochondria. This quality makes MitoBloCK-6 - or a derivative compound with similar properties - ideal for potential use as a drug, because it can function in many cell types and species and can alter the function of mitochondria in the body for therapeutic effects.

"It is exciting that our research in the one-cell model baker's yeast yielded an agent for investigating and controlling mitochondrial function in human pluripotent stem cells," Koehler said. "This illustrates that mitochondrial function is highly conserved across organisms and confirms that focused studies in model systems provide insight into human stem-cell biology. When we started these experiments, we did not predict that we would be investigating and controlling mitochondrial function in pluripotent stem cells."

The research was supported by the California Institute for Regenerative Medicine, the National Institutes of Health, the United Mitochondrial Disease Foundation, and the Development and Promotion of Science and Technology Talents Project of the Royal Thai Government.


Further Information

Join For Free

Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 3,000+ scientific posters on ePosters
  • More than 4,500+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.

Related Content

Transcription Factor Isoforms Implicated in Colon Diseases
UC Riverside study explains how distribution of two forms of a transcription factor in the colon influence risk of disease.
Thursday, May 19, 2016
Cat Stem Cell Therapy Gives Humans Hope
By the time Bob the cat came to the UC Davis veterinary hospital, he had used up most of his nine lives.
Monday, February 08, 2016
Embryonic Switch for Cancer Stem Cell Generation
An international team of scientists report that decreases in a specific group of proteins trigger changes in the cancer microenvironment that accelerate growth and development of therapy-resistant cancer stem cells (CSCs).
Wednesday, December 02, 2015
Artificial Kidney Research Gets A Boost
Development of a surgically implantable, artificial kidney — a promising alternative to kidney transplantation or dialysis for people with end-stage kidney disease — has received a $6 million boost.
Monday, November 09, 2015
Scientists Create CRISPR/Cas9 Knock-In Mutations in Human T Cells
In a project spearheaded by investigators at UC San Francisco, scientists have devised a new strategy to precisely modify human T cells using the genome-editing system known as CRISPR/Cas9.
Tuesday, July 28, 2015
Growing Spinal Disc Tissue
Scientists develop new method for growing spinal disc tissue in the lab for combating chronic back pain.
Friday, July 03, 2015
Grant Supports Creation of Patient-Derived Stem Cell Lines
Researchers have received a two-year, $600,000 grant from the National Institute on Aging to develop and study patient-derived stem cell lines.
Thursday, December 12, 2013
Prostate Cancer Stem Cells are a Moving Target
Researchers have discovered how prostate cancer stem cells evolve as the disease progresses, a finding that could help point the way to more highly targeted therapies.
Friday, December 06, 2013
Researchers Change Cell Types by Flipping a Single Switch
New findings have identified a method for changing one cell type into another in a process called forced transdifferentiation.
Friday, December 06, 2013
Understanding a Protein’s Role in Familial Alzheimer’s
Researchers have used genetic engineering of human iPSC’s to specifically and precisely parse the roles of a key mutated protein in causing familial Alzheimer's disease (AD).
Monday, November 18, 2013
Researchers Un-Junking Junk DNA
A study shines a new light on molecular tools our cells use to govern regulated gene expression.
Wednesday, November 13, 2013
$100M gift launches Sanford Stem Cell Clinical Center
T. Denny Sanford has committed $100 million to the creation of the Sanford Stem Cell Clinical Center at the University of California, San Diego.
Wednesday, November 06, 2013
Grafted Limb Cells Acquire Molecular ‘Fingerprint’ of New Location
Findings further creation of regenerative therapies for humans.
Wednesday, October 30, 2013
From Mature Cells to Embryonic-Like Stem Cells
Bioengineers have shown that physical cues can replace certain chemicals when nudging mature cells back to a pluripotent stage.
Tuesday, October 22, 2013
Researchers Develop Stem Cell Therapies for Acute Lung Injury
An estimated 200,000 patients a year have acute respiratory failure in the U.S. and mortality is about 30 to 40 percent.
Monday, October 21, 2013
Scientific News
Heart Defect Prediction Technology Could Lead to Earlier, More Informed Treatment
Experimental method uses genetics-guided biomechanics, patient-specific stem cells.
Immune Cells Remember Their First Meal
Scientists at the University of Bristol have identified the trigger for immune cells' inflammatory response – a discovery that may pave the way for new treatments for many human diseases.
Cancer Cells Coordinate to Form Roving Clusters
Rice University scientists identify ‘smoking gun’ in metastasis of hybrid cells.
Bio-Mimicry Method For Preparing & Labeling Stem Cells Developed
Method allows researchers to prepare mesenchymal stem cells and monitor them using MRI.
Transcription Factor Isoforms Implicated in Colon Diseases
UC Riverside study explains how distribution of two forms of a transcription factor in the colon influence risk of disease.
New Bio-Glass Could Make it Possible to Re-Grow or Replace Cartilage
Researchers at Imperial College London have developed a material that can mimic cartilage and potentially encourage it to re-grow.
Stem Cell Advance Could Be Key Step Toward Treating Deadly Blood Diseases
UCLA scientists get closer to creating blood stem cells in the lab.
Harnessing Engineered Slippery Surfaces For Tissue Repair
A new method could facilitate the transfer of intact regenerating cell sheets from the culture dish to damaged tissues in patients.
Brazilian Zika Virus Strain Causes Birth Defects in Experimental Models
First direct experimental proof of causal effect, researchers say.
Stem Cell Gene Therapy For Fatal Childhood Disease Ready For Human Trial
A pioneering approach for Sanfilippo disease, a genetic condition for which there is no effective treatment, will now be trialled in humans.
SELECTBIO

SELECTBIO Market Reports
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
3,000+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
4,500+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FOR FREE!