Stem Cell Preservation 101

Stem Cell Preservation 101

Stem cells are precursor cells which mean they are primary cells that can differentiate to form mature or adult cells of different types. In humans, there are two types of stem cells:

• Embryonic stem cells- are found in an embryo and later differentiate into different forms of tissues as the embryo develops.
• Adult stem cells- are found in adult tissue which differentiate and help in replacing dead cells in the body.

The stem cells, because they have the capacity of forming new cells, are used in treating many diseases, some of which had no cure in earlier times. In today’s world, as many as 70 different diseases can be treated by the help of stem cells. Some of the diseases that can be treated with stem cells include many cancers, blood disorders, metabolic disorders, stem cell disorders, etc.

Sometimes the use of embryonic stem cells is widely opposed when it involves the destruction of the embryo. For these reasons, adult stem cells are the ones that are utilized in treating various conditions. Adult stem cells can be obtained from bone marrow or from cord blood (the blood that is found in the umbilical cord just after the delivery of the child) and from the placenta. These stem cells can not only be used to treat conditions that arise in the child but can also be used to treat some conditions that occur in other siblings, parents, other relatives and in some cases even unrelated people.

Cord blood and the placenta contain stem cells that are similar to stem cells found in bone marrow. Obtaining the cord blood and placenta is a one time opportunity that can be collected only at the time of delivery of a child and can be processed and preserved by keeping them in liquid nitrogen.

Stem cell preservation has to be planned much prior to delivery of the child. There are many cell banks that have been established to undertake this process and store and preserve the cells such that they are viable and useful for therapy, if the need arises at a later point of time.

Once a cord blood bank has been chosen for stem cell preservation, all the formalities for collection at birth should be completed beforehand. Just before delivery, two test tubes of blood are drawn from the mother and sent for testing for any communicable diseases. At the time of delivery, the doctor extracts the cord blood (around 75-100ml) and the placenta and sends the cord blood to the cord blood bank in special collection bags designed for this purpose.

Once the cord blood and the placenta reach the cell bank, it is disinfected, processed and a cryopreservative is added. Some cord blood banks utilize a method of separating the red blood cells in the cord blood while some don’t.

Once these processes are complete, the stem cells are tested for their viability by performing tests. The stem cell preservation is then begun by slow cooling first to around -90 degrees and then placed in liquid nitrogen where the temperature is maintained at -190 degrees Celsius. The viability of the cells will be lost if they are cooled too rapidly.

This is the method in which stem cell preservation is conducted, and preserved stem cells can be later taken if needed for therapy at any point in time. This process even though costly at this time is insurance that can store stem cells to fall back on if the need for future therapy arises.