Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Heart repair with unfertilized oocytes

25.02.2013
First time worldwide: Research team at the University Medical Center Göttingen, Germany, grows heart repair tissue using stem cells from unfertilized oocytes.

The concept was first shown in mice and advantages were documented. Online publication in JOURNAL FOR CLINICAL INVESTIGATION on 22 February 2013.


Engineered heart muscle tissue from parthenogenetic heart muscle cells
Photo: umg

Faster, easier and more reliable – this is stem cell researcher Prof. Dr. Wolfram-Hubertus Zimmermann’s vision when thinking of heart repair with artificial cardiac cells or artificial cardiac tissue. Prof. Zimmermann, Director of the Department of Pharmacology at the University Medical Center Göttingen, Germany, and member of the Heart Research Center Göttingen (HRCG) and his team found a new and almost natural way of creating artificial heart-repair material.

The use of stem cells is indispensable for the clinical introduction of artificial cardiac tissue. The quest for Jack-of-all-trades cells is on. In Germany, researchers are looking particularly intensively into the potential of non-embryonic stem cells. Until recently, non-embryonic stem cells, which can be generated by unisexual reproduction or “virgin birth” (parthenogenesis) from unfertilized oocytes received little attention. These cells are called parthenogenetic stem cells (PS cells).

FIRST TIME WORLDWIDE
Researchers at the University Medical Center Göttingen (UMG), Germany, have now succeeded in growing heart tissue in the laboratory using stem cells generated from unfertilized murine oocytes. The heart tissue obtained, so-called Engineered Heart Muscle (EHM), beats spontaneously like natural heart tissue and can be used therapeutically in mice to repair heart attacks. These fundamental research results were published today, Friday, 22 February 2013, in the distinguished scientific JOURNAL FOR CLINICAL INVESTIGATION.

“We have shown for the first time that unfertilized oocytes are a promising starting material for the tissue engineering-based treatment of post-infarct heart failure” says Prof. Dr. Wolfram-Hubertus Zimmermann, senior author of the study: “What is important is that the method requires no embryos or genetic manipulations.”

Original publication: Michael Didié, Peter Christalla, Michael Rubart, Vijayakumar Muppala, Stephan Döker, Bernhard Unsöld, Thomas Rau, Thomas Eschenhagen, Alexander P Schwoerer, Heimo Ehmke, Udo Schumacher, Sigrid Fuchs, Claudia Lange, Alexander Becker, Tao Wen, John A Scherschel, Mark H Soonpaa, Tao Yang, Qiong Lin, Martin Zenke, Dong-Wook Han, Hans R. Schöler, Cornelia Ru-dolph, Doris Steinemann, Brigitte Schlegelberger, Steve Kattman, Alec Witty, Gor-don Keller, Loren J Field and Wolfram-Hubertus Zimmermann. Parthenogenetic Stem Cells for Tissue Engineered Heart Repair. J CLIN INVEST (2013) doi:10.1172/JCI66854.

RESULTS IN DETAIL: WHAT CAN PARTHENOGENETIC STEM CELLS DO?
In their work, the researchers scrutinized and documented the qualities and potentials of PS cells and produced the following results: PS cells share similar biologic properties with embryonic stem cells. PS cells are capable of generating functional heart muscle cells in the laboratory as well as in the body of mice. Moreover, PS cells can be used to produce engineered heart muscle in the laboratory. PS cells are immunologically simpler that other stem cells, which is very important for the broad application of engineered heart muscle for cardiac repair.
IMMUNOLOGICAL ADVANTAGE: FEWER REJECTIONS
„Our investigations have shown: Artificial heart tissue from parthenogenetic stem cells causes no or easier-to-control rejection reactions even after implantation into genetically unrelated recipients. “This is a clear advantage over other stem cells”, says Dr. Michael Didié, first author of the publication and member of the Depart-ment of Pharmacology and the Department of Cardiology and Pneumology at UMG. This effect is due to the fact that the genetic material in uniparental parthe-notes is less variable than in opposite-sex embryos.
TRANSFERABLE TO HUMANS?
Subsequent investigations alone can show if the new concept, now shown for the first time in mice, is transferable to humans. The team around Prof. Zimmermann wants to test the therapeutic potential of parthenogenesis for patients. To do so, unfertilized human oocytes are needed. In Germany alone, 60,000 unfertilized oocytes are discarded annually, because they are unsuitable for in vitro fertilization procedures, according to statistics from the German Society for Reproductive Medicine. Thus, no additional oocyte donations are required for Prof. Zimmer-mann’s planned work, as merely the existing oocytes that are no longer needed can be used.

“The road to clinical application in patients with heart failure is still long, and we need to ensure that patients are not exposed to intolerable risks”, says Prof. Zim-mermann. “On the other hand, cell-based tissue repair offers an exciting perspec-tive not only for the treatment of patients with heart failure but possibly also for the treatment of patients with other life-threatening diseases.”

Prof. Zimmermann envisions biobanks containing stem cell lines for therapeutic use. Model calculations permit the conclusion that 80 to 100 different PS cells would be sufficient to achieve tissue repair without the need for additional immune suppression in a population of an estimated 100 million.

UNISEXUAL REPRODUCTION (PARTHENOGENESIS)
Natural parthenogenesis is a form of unisexual reproduction that can be found occasionally in the animal world. Viable offspring develop from unfertilized oocytes. Mammals, including humans, have lost the capacity of parthenogenesis. However, using a pharmacologic trick, mammalian oocytes, too, can be activated partheno-genetically in the laboratory. To do so, unfertilized oocytes are stimulated with an electrical or chemical stimulus alone to divide. An embryo cannot develop. The developing parthenotes can be used to obtain pluripotent stem cells.

The Heart Research Center Göttingen (HRCG) was founded in 2010 from within the research focus “Heart Failure and Regeneration” at the University Medical Center Göttingen. Basic and clinical researchers are equally represented at the HRCG, which combines the collaborative efforts of the Heart Center Göttingen at the UMG, the Max Planck Institute (MPI) for Experimental Medicine, the MPI for Biophysical Chemistry, the MPI for Dynamics and Self-Organization and the German Primate Center (DPZ). The close collaboration between clinicians and basic researchers offers the unique opportunity to translate basic research results promptly into clinical practice. This objective is pursued by researchers of the HRCG as well as by partners at the German Center for Cardiovascular Research (Deutsches Zentrum für Herzkreislaufforschung, DZHK).

FURTHER INFORMATION
University Medical Center Göttingen, Georg-August-University Göttingen
Department of Pharmacology
Prof. Dr. Wolfram-Hubertus Zimmermann
Robert-Koch-Str. 40, 37075 Göttingen
Telefone +49 (0)551 / 39-5781
w.zimmermann@med.uni-goettingen.de
Department of Pharmacology: www.pharmacology.med.uni-goettingen.de
HRCG: www.herzzentrum-goettingen.de/de/content/forschung/551.html
DZHK: www.dzhk.de

Stefan Weller | idw
Further information:
http://www.med.uni-goettingen.de

More articles from Life Sciences:

nachricht Single-stranded DNA and RNA origami go live
15.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard

nachricht New antbird species discovered in Peru by LSU ornithologists
15.12.2017 | Louisiana State University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>