ScienceDaily (Sep. 6, 2010) — Recent research by a team of scientists from Israel, Germany, and the U.S. has revealed how physical qualities -- and not only chemical ones -- may have an influence in determining how adult stem cells from the bone marrow develop into differentiated ones. The finding represents an important step in understanding the mechanisms that direct and regulate the specialization of stem cells from their undefined state.

Scientists around the world are involved in studying, describing and even manipulating the development of stem cells on their path into becoming specialized cells, such as heart, muscle, brain or any other tissue. This research has tremendous implications for the future utilization of stem cells as a new tool of medical treatment.

In an article published in Nature Physics, Dr. Assaf Zemel of the Institute of Dental Sciences at the Hebrew University and his fellow researchers, Prof. Samuel Safran from the Weizmann Institute of Science, Dr. Florian Rehfeldt from Gottingen University in Germany, and Dr. Andre Brown and Prof. Dennis Discher from the University of Pennsylvania, tell how they have developed a theoretical model and carried out experiments on stem cells to propose a mechanism for the recently discovered sensitivity of stem cell differentiation to the rigidity of their surroundings.

They described the physical changes that take place in stem cells that are layered on supporting foundations of differing rigidities. They showed that on a supporting matrix whose rigidity mimics that of muscle tissue, the cells become elongated and filled with aligned muscle-like fibers. The authors explain how this situation is fundamentally different from the case where the supporting substance is made either softer (to mimic brain tissue) or harder (to mimic bone tissue), in which case the cells adopt more symmetric structures and differentiate into brain and bone cells, respectively.

These findings shed new light on our understanding of the mechanisms that govern the differentiation of stem cells and may have important implications for the design of artificial tissues and the development of novel therapeutic strategies, says Dr. Zemel.

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The above story is reprinted from materials provided by Hebrew University of Jerusalem, via AlphaGalileo.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Journal Reference:

1. A. Zemel, F. Rehfeldt, A. E. X. Brown, D. E. Discher, S. A. Safran. Optimal matrix rigidity for stress-fibre polarization in stem cells. Nature Physics, 2010; 6 (6): 468 DOI: 10.1038/nphys1613

Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

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