Navigation Links
UCLA stem cell researchers uncover mechanism that regulates human pluripotent stem cell metabolism
Date:11/15/2011

Human pluripotent stem cells, which can develop into any cell type in the body, rely heavily on glycolysis, or sugar fermentation, to drive their metabolic activities.

In contrast, mature cells in children and adults depend more on cell mitochondria to convert sugar and oxygen into carbon dioxide and water during a high energy-producing process called oxidative phosphorylation for their metabolic needs.

How cells progress from one form of energy production to another during development is unknown, although a finding by UCLA stem cell researchers provides new insight for this transition that may have implications for using these cells for therapies in the clinic.

Based mostly on visual appearance, it had been assumed that pluripotent stem cells contained undeveloped and inactive mitochondria, which are the energy-producing power plants that drive most cell functions. It was thought that stem cell mitochondria could not respire, or convert sugar and oxygen into carbon dioxide and water with the production of energy. This led most scientists to expect that mitochondria matured and gained the ability to respire during the transition from pluripotent stem cells into differentiated body cells over time.

Surprisingly, UCLA stem cell researchers discovered that pluripotent stem cell mitochondria respire at roughly the same level as differentiated body cells, although they produced very little energy, thereby uncoupling the consumption of sugar and oxygen from energy generation. Rather than finding that mitochondria matured with cell differentiation, as was anticipated, the researchers uncovered a mechanism by which the stem cells converted from glucose fermentation to oxygen-dependent respiration to achieve full differentiation potential.

The four-year study appears in the Nov. 15, 2011 issue of The EMBO Journal, a peer-reviewed journal of the European Molecular Biology Organization. Teitell collaborated with Carla Koehler, a UCLA professor of chemistry and biochemistry, for the study.

"A lot of attention is being paid to the role of metabolism in pluripotent stem cells for making properly differentiated cell lineages for research and potential clinical uses," said study senior author Dr. Michael Teitell, a researcher with the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research at UCLA and a professor of pediatrics, pathology and laboratory medicine, and bioengineering.

The initial question prompting our study was whether metabolism in pluripotent stem cells and cancer cells, which also rely heavily on glycolysis, were molecularly similar," he said. "This question led us to study the details of energy-generation by mitochondria in pluripotent stem cells."

Cells make energy in the form of ATP mainly in two ways, by glucose uptake and fermentation in the cytoplasm or by using respiration, in which glucose and oxygen are consumed to make carbon dioxide and water to fuel cell functions. Teitell and his team expected that pluripotent stem cells could not respire because of prior reports on the immature appearance and paucity of mitochondria.

Teitell's team found that the molecular complexes responsible for respiration, called the electron transport chain, in the mitochondria of pluripotent stem cells were functional, and yet the cells instead relied on glycolysis for energy production. The researchers speculated that there were one or more unknown regulators that kept the stem cells from respiring, since the electron transport chain was functional.

Jin Zhang, a graduate student and first author of the study, discovered that a protein called uncoupling protein 2 (UCP2), was highly expressed in the stem cells. He also found that UCP2 blocked respiration substrates derived from sugar from gaining access to the mitochondria, instead shunting them to the glycolytic and biosynthesis pathways located in the cytoplasm, inhibiting the stem cell's ability to respire as a method for generating energy.

As pluripotent stem cells were driven to develop into mature cell types, UCP2 expression was shut off, allowing respiration substrates to enter the mitochondria for energy generation, switching the cells from glycolysis to oxidative phosphorylation. Manipulating UCP2 expression, by keeping it switched on in differentiating cells, disturbed their maturation, a finding that could make them unsuitable for clinical use and also pointing to the importance of properly functioning metabolism for generating safe, high quality cells.

Teitell and his team confirmed these findings in both human embryonic stem cells and in induced pluripotent stem cells, which are mature body cells that are genetically reprogrammed to have similar abilities and attributes as the pluripotent embryonic stem cells.

"A main question that evolved during the study was whether it was the process of pluripotent stem cell differentiation that was altering the pattern of metabolism, or was it the change in the pattern of metabolism that altered the process of differentiation, a typical chicken-or-the-egg question," Teitell said. "We over-expressed UCP2 in the stem cells and showed that metabolism patterns changed before markers of pluripotency or cell maturation changed, indicating that changes in metabolism affect changes in differentiation and not the other way around, at least for UCP2. This was important, to show causation for metabolic changes in driving the process of cell differentiation. However, it still leaves open the key question of exactly how manipulating cell metabolism controls cell differentiation, a question we are working hard to address."

Since metabolism in pluripotent stem cells and cancer cells appear quite similar, Teitell said the finding could potentially be used to target UCP2 in malignant tumors that express it, of which there are many. Silencing UCP2 could force cancer cells to respire, which might impair their ability to grow quickly.


'/>"/>

Contact: Kim Irwin
kirwin@mednet.ucla.edu
310-206-2805
University of California - Los Angeles Health Sciences
Source:Eurekalert

Related medicine news :

1. Ben-Gurion University of the Negev researchers achieve male fertility breakthrough
2. Canadian researchers find potential new leukemia treatment with old antibiotic drug
3. FDA funds Rochester researchers to give chronic and acute pain clinical trials a makeover
4. Jefferson researchers study outcomes of carotid artery stenting following prior carotid procedure
5. Researchers gain insight into 100-year-old Haber-Bbosch process
6. New funding will help researchers learn how preschoolers move, battle early child obesity
7. Pitt researchers using mathematics to target Parkinsons disease symptoms
8. Moffitt Cancer Center researchers unravel biochemical factor important in tumor metastasis
9. Lose the fat and improve the gums, CWRU dental researchers find
10. Researchers identify diabetes link to cognitive impairment in older adults
11. UGA researchers develop first mouse model to study important aspect of Alzheimer’s
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... ... February 10, 2016 , ... Ongoing news of the ravages of ... (ALCA) to conduct a survey that takes a closer look at cases of TBI ... prevalence and causes of TBI among the aging population, and identifies the challenges associated ...
(Date:2/10/2016)... ... February 10, 2016 , ... Armune BioScience signed a ... network of laboratory service centers across the country. Launched in April of 2015, Apifiny ... detection of prostate cancer. Apifiny order volume exceeded 3,000 tests in 2015. Primary care ...
(Date:2/10/2016)... ... February 10, 2016 , ... ... it has been awarded the prestigious Distinguished Emerald Club of the World award, ... by BoardRoom magazine, one of the most respected trade publications serving private clubs. ...
(Date:2/10/2016)... CA (PRWEB) , ... February 10, 2016 , ... Workrite ... based company that has evolved from humble beginnings to being an internationally recognized leader ... company that we are today”, said Charlie Lawrence, President of Workrite. “Workrite recognized ...
(Date:2/10/2016)... FLA (PRWEB) , ... February 09, 2016 , ... ... team at Clevens Face and Body Specialists are delighted to welcome a new ... ARNP joins Clevens Face and Body Specialists as a nurse practitioner performing ...
Breaking Medicine News(10 mins):
(Date:2/9/2016)... REDWOOD CITY, Calif. , Feb. 9, 2016 /PRNewswire/ ... medical device company that is providing innovative evidence-based solutions ... it will release financial results for the fourth quarter ... Monday, February 29, 2016. Company management will host a ... p.m. Eastern Time) on Monday, February 29, 2016. ...
(Date:2/9/2016)... Feb. 9, 2016  Insulet Corporation (NASDAQ: PODD ) ... pump technology with its OmniPod ® ... has been appointed to Insulet,s Board of Directors. With ... eight of whom are independent. --> ... audit and finance experience and a deep knowledge of accounting, ...
(Date:2/9/2016)... 9, 2016 QGEN ... den Abschluss eines Kooperationsvertrags mit 10x Genomics ... in den Bereichen Next-Generation-Sequencing (NGS), Single-Cell-Biology und ... Frankfurt Prime Standard: QIA) gab heute den ... die Entwicklung und Förderung umfassender Lösungen in ...
Breaking Medicine Technology: