Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Establishing the first line of human embryonic stem cells in Brazil

03.05.2011
Brazilian researchers, reporting in the current issue of Cell Transplantation (20:3) (now freely available on-line at http://www.ingentaconnect.com/content/cog/ct/ ), discovered difficulties in establishing a genetically diverse line of human embryonic stem cells (hES) to serve the therapeutic stem cell transplantation needs of the diverse ethnic and genetic Brazilian population.

According to the study's corresponding author, Dr. Lygia V. Pereira of the Molecular Genetics Laboratory at the University of Sao Paulo, Brazil, pluripotent human embryonic stem cells are an important tool for basic and applied stem cell transplantation research. However, immunocompatibility is an issue, especially in a genetically diverse population such as that in Brazil where the population is comprised of European, African and Native South American ancestry.

In their study, the researchers developed an hES cell line (the first in South America) they called "BR-1" derived from a Brazilian population with embryos donated by couples who had sought assistance from private fertility clinics. Their research was compatible with the 2005 Brazilian national legal, ethical and clinical guidelines for embryonic stem cell research using tissue that had been frozen for the legally mandated time of at least three years, and that had been produced for reproductive reasons.

Their results showed that the hES cell lines they established were a "worse match" to the Brazilian population than hES lines developed elsewhere, particularly those developed in the U.S. and Singapore. The reasons for that may be several, said Dr. Pereira.

"The Brazilian population is one of the most heterogeneous in the world, and the genes of Brazilians are mosaics," said Dr. Pereira. "However, an analysis of BR-1 showed that it is mostly European in origin. The reproductive assistance offered by the Brazilian public health system does not include cryopreservation of surplus embryos, meaning that the only research material available came from private clinics where couples with above-average incomes could afford the high cost of assisted reproduction."

According to the researchers, that segment of the Brazilian population is mostly composed of people self-identified as white - of European ancestry - and so are not representative of Brazilian ethnic admixture and, thus, are unable to be widely compatible with Brazil's diverse population genetics.

"Although we have successfully established the first line of hES from the Brazilian population that adds to the pool of genetically different pluripotent cells available, it will be important to have access to embryos from the more mixed population and assistance from the Public Health System," concluded Dr. Pereira.

"Use of embryonic stem cells (ES) in regenerative medicine is very promising, but the potential problems of tumor development, cell rejection due to histo-incompatibility, and contamination with animal products employed in the cell culture need to be overcome," said Dr. Julio Voltarelli, professor of Clinical Medicine and Clinical Immunology at the University of Sao Pãulo, Brazil and section editor for Cell Transplantation. "In this study, Dr Pereira and colleagues compared the HLA compatibility between their ES line, the first established in Brazil, and a sample of the Brazilian population who volunteered as donors for hematopoietic stem cell transplantation (REDOME). They found few matches for the ES line in the representative population, which was attributed to the great genetic heterogeneity of the Brazilian population. This finding may add another difficulty to the clinical use of ES in Brazil and other mixed populations even once the safety issues of ES lines are resolved."

Contact: Dr. Lygia V. Pereira, Laboratorio de Genetica Molecular and Laboratorio Nacional de Celuas-Tronco Embrionarias, Instituto de Biociensas, Universidade de Sao Paulo, Sao Paulo SP, 05508-090 Brasil,

Tel: Fax: Email: lpereira@usp.br

Citation:. Fraga, A. M.; Sukoyan, M.; Rajan, P.; Braga, D. P. F.; Iaconelli, A., Jr.; Franco, J. G., Jr.; Borges, E., Jr.; Pereira, L. V. Establishment Of A Brazilian Line Of Human Embryonic Stem Cells In Defined Medium – Implications For Cell Therapy In An Ethnically Diverse Population. Cell Transplant. 20(3):431-440; 2011.

The editorial offices for Cell Transplantation are at the Center of Excellence for Aging and Brain Repair, College of Medicine, the University of South Florida and the Diabetes Research Institute, University of Miami Miller School of Medicine. Contact, David Eve, PhD. at celltransplantation@gmail.com or Camillo Ricordi, MD at ricordi@miami.edu

News Release by Randolph Fillmore, Florida Science Communications, www.sciencescribe.net

David Eve | EurekAlert!
Further information:
http://www.ingentaconnect.com/content/cog/ct/

More articles from Life Sciences:

nachricht Symbiotic bacteria: from hitchhiker to beetle bodyguard
28.04.2017 | Johannes Gutenberg-Universität Mainz

nachricht Nose2Brain – Better Therapy for Multiple Sclerosis
28.04.2017 | Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>