?Inside the human bone, there are a soft, spongy and fatty tissue present which is responsible for the production of red blood cells, (role: oxygenation and nutrients distribution in the body), white blood cells (immunity), and platelets (responsible for blood clotting).
Damaged bone marrow as a result of chemotherapy, infection or disease is replaced in a bone marrow transplant. This is done by blood stem cell transplantation where the healthy blood cells travel to the marrow and produce new blood cells as well as promote the new marrow’s growth.
This bone marrow also houses the hematopoietic stem cells or HSCs which are the immature blood-forming stem cells. Most cells can make their own copies and get differentiated into other functional cells. But stem cells are unspecialized and are capable of multiplying via cell division and differentiate into mature blood cells or remain as stem cells. The HSC present in the marrow is capable of making new blood cells all throughout the lifespan.
So a bone marrow transplant replaces the damaged stem cells with healthy ones which help the body to make enough white blood cells, red blood cells and platelets to avoid various bleeding disorders, anemia, and infection. There is the best bone marrow transplant surgery done in India.
Healthy stem cells can be received from a donor or they may be produced from the patient’s own body. So before chemotherapy radiation, these stem cells will be harvested and grown. These healthy cells will be kept in store and used late during transplantation.
Based on the above there are two kinds of transplants namely:
Autologous stem cell transplants: In this kind of transplant, own stem cells are used. In this case, the cells are collected from the patient’s body before they are about to undergo damaging therapy. The healthy and harvested stem cells are introduced back to the body after the treatment is over. But this technique cannot be used if the patient does not house healthy stem cells in the body. But if this can be done then it reduces the chances of many other complications.
Allogeneic transplants: in this case stem cells are collected from a donor. The donor identified must be a very close match to the patient genetically. This can be done by browsing through a donor registry or a compatible relative can be a good choice.
The donor cells, when introduced to the patients’ body can trigger false alarms which can make the immune system attack the new cells and treat them as foreign harmful bodies. For this, the patient is put on medications to suppress their immune system. The risk of this is that the patient is being exposed to illness due to a weakened immune system.
The success of the above is highly dependent on how well the donor cells found a match with the patient’s body type.