Helping transplanted stem cells stick around and do their jobs

Bone marrow transplants of hematopoietic stem cells have become standard treatment for a host of conditions including cancers of the blood and lymphatic systems, sickle cell anemia, inherited metabolic disorders, and radiation damage. Unfortunately, many bone marrow transplants fail due to rejection by the patient’s immune system or graft-versus-host disease (in which the transplanted marrow cells attack the patient’s healthy cells), both of which can be fatal. Mesenchymal stromal cells (MSCs) are known to secrete compounds that modulate the immune system and have shown promise in mitigating these problems in animal trials. However, clinical results with MSCs have been disappointing thus far, as they are rapidly cleared from the body and can draw attack from patients’ immune systems, and efforts to encapsulate MSCs in protective

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