Cord Blood Stem CellsBlood can be collected from the umbilical cord of a newborn baby shortly after birth. This blood is rich in blood stem cells that can be used to generate red blood cells and cells of the immune system. Cord Blood stem cells can be used to treat a range of blood disorders and immune system conditions such as leukaemia, anaemia and autoimmune diseases. Once collected, cord blood can be stored in a cord blood bank and would be available for use by the donor and compatible siblings. Alternatively, the cord blood may be donated to a general cord blood bank for use by other tissue matched individuals in need of a transplant. It is hoped that over time a store of cord blood stem cells from people of different tissue types may be established. Someone requiring a transplant would be treated with stem cells from the sample most closely matching their own tissue type, thus minimising complications associated with immune rejection. Cord blood stem cells may also be useful for treatment of diseases other than blood disorders. Preliminary research reports suggest that cord blood stem cells may have a greater ability to differentiate into different cell types than was previously thought possible. Using animal model, several research groups have used human cord blood stem cells to treat heart attacks and repair injured blood vessels. However, this research is at a very early stage. Scientists are presently unsure whether the cord blood stem cells are transformed into heart muscle or blood vessels, or if they secrete growth factors, that trigger repair. If further studies and clinical trials prove successful, cord blood stem cells may provide a new treatment for cardiovascular disease with fewer side effects than current drug based and surgical treatments.
Ethical IssuesThe use of cord blood stem cells in cell-based therapies for blood and immune diseases, and for other potential applications, would be welcomed by the majority of the community. Although cord blood stem cells are less versatile than Embryonic Stem cells, their use in research is less controversial as it does not involve the destruction of embryos. Their potential use for cell-based therapies is also attractive as it would be possible to use a patient's own cord blood stem cells to generate tissue for transplantation, thus avoiding problems with immune rejection. Saviour SiblingsControversy has arisen over the practice of genetically selecting embryos created during infertility treatment, for the purpose of using the donor baby's cord blood to treat an ill sibling. In this procedure, genetic testing is performed to ensure that the embryo will provide cord blood devoid of the genetic defect afflicting the sibling, but which matches the sibling's genetic make up. The donor baby in this case is sometimes referred to as a 'savior sibling'. The first 'saviour sibling' to be born in Australia was reported in March 2004. A Tasmanian couple used this technology to have a second child who was free of a genetic condition, Hyper IgM Syndrome. Cord blood from this child could be used to treat the affected sibling. As a result of this selection process carried out Sydney IVF Clinic, the woman started her pregnancy knowing that her baby was free of Hyper IgM Syndrome and would be a potential tissue donor for her existing son. The creation of 'saviour siblings' has evoked a quite heated debate in both the medical and general community. Some are vehemently opposed to this application, considering this the first step in 'designer babies'. Others consider it highly unethical not to use this technology to help the sick sibling. The overarching issue to be considered is the well being of the 'savior sibling', and to ask the question whether they will be disadvantaged by the procedure. These are questions to be considered by both the biomedical and general community when considering applications of any new technology. |
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