Bone marrow protein may be used for stem cell transplant

Bone marrow contains hematopoetic stem cells, the precursors to every blood cell type. These cells become after bone marrow transplants, bone marrow injury and during systemic infection, creating new blood cells, including immune cells.

Del-1 is a protein that plays a role in gum disease, it regulate the production of blood cells. Targeting it could be an effective way to improve stem cell transplants for both donors and recipients. Modulate levels of Del-1 in patients with certain blood cancers can enhance immune cell production.

Because the hematopoetic stem cell niche is so important for the creation of bone marrow and blood cells and because Del-1 is a soluble protein and is easily manipulated, it could be a target in many potential applications.

The researchers' investigations revealed that Del-1 was expressed by at least three cell types in the bone marrow that support hematopoetic stem cells: endothelial cells, CAR cells and osteoblasts.

Using mice deficient in Del-1, they found that the protein promotes proliferation and differentiation of hematopoetic stem cells, sending more of these progenitor cells down a path toward becoming myeloid cells, such as macrophages and neutrophils, rather than lymphocytes, such as T cells and B cells.

In bone marrow transplant experiments, researchers discovered that the presence of Del-1 in recipient
bone marrow is required for the transplanted stem cells to engraft in the recipient and to facilitate the process of myelopoesis, the production of myeloid cells.

When the researchers mimicked a systemic infection in mice, animals deficient in Del-1 were slower to begin making myeloid cells again compared to those with normal Del-1 levels.

The scientists see potential applications in bone marrow and stem cell transplants, for both donors and recipients. In donors, blocking the interaction between Del-1 and hematopoetic stem cells could enhance the mobilization of those progenitors into the bloodstream. This could be helpful for increasing donor cell numbers for transplantation.

Transplant recipients, on the other hand, may need enhanced Del-1 interaction to ensure the transplanted cells engraft and begin making new blood cells more rapidly. People undergoing chemotherapy who develop febrile neutropenia, associated with low levels of white blood cells, might benefit from the role of Del-1 in supporting the production of immune-related blood cells such as neutrophils.
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