CD133 (Prominin) is widely used as a marker for the identification and isolation of neural precursor cells from normal brain or tumor tissue. However, the assumption that CD133 is expressed constitutively in neural precursor cells has not been examined.
In this study, we demonstrate that CD133 and a second marker CD15 are expressed heterogeneously in uniformly undifferentiated human neural stem (NS) cell cultures. After fractionation by flow cytometry, clonogenic tripotent cells are found in populations negative or positive for either marker. We further show that CD133 is down-regulated at the mRNA level in cells lacking CD133 immunoreactivity. Cell cycle
Spinal cord injuries, resulting in permanent disability or paralysis in most cases, account for around eleven thousand new cases in the US, annually. Due to the lack of effective treatment strategies, it is considered as the most devastating of all traumatic conditions. Now, a recent study published in the journal Stem Cells reports that activation of ependymal stem/progenitor cells from injured spinal cord (epSPCi), using endogenous stem cell-associated mechanisms, may aid in rescuing neurological function, thereby reversing paralysis associated with spinal cord injuries.
Scientists have now shown that skin cells can be coaxed to behave like muscle cells and muscle cells like skin cells.
The fickleness of the cells, and the relative ease with which they make the switch, provide a glimpse into the genetic reprogramming that must occur for a cell to become something it’s not.
“We’d all like to understand what happens inside the black box (cell),” said Helen Blau, professor and member of Stanford University‘s Stem Cell Biology and Regenerative Medicine Institute and co-author of a new study on the subject.
Harnessing these genetic makeovers will allow scientists to better
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Embryonic stem cells (ESC) can survive even when inserted into chains of polymers, in a process in which they are “weaved” into artificial and flexible tissues able to adapt to various types of transplants. In an innovative technique, stem cells could be used in the future to produce artificial organs, say researchers at University College London.
The technique was described in a study, published in Integrative Biology. It implements other research to shape living cells into engineered tissues, including a technique which would print a live tissue using an ink printer, which would substitute normal ink
Image by Marcos (In the fast lane) via Flickr
Culturing stem cells to use to treat certain illnesses is already a reality. In Spain, two labs have received authorization from the Agencia Espanola de Medicamento y Productos Sanitarios to produce stem cells, and there are others waiting to be certified.
Currently, just one public health center, the Gregorio Maranon Hospital in Madrid (HGM) and one private center, the Clinica Universitaria in Navarra (CUN) have undergone the rigid system of quality certification to become “Good Manufacturing Regulations” (GMR) laboratories and are developing stem cell products to be administered and transplanted into