Monotypic immunoglobulin E plasma cells in an allogeneic bone marrow transplant recipient

Area of Science:

• Immunology
• Hematology
• Transplantation Science

Background:

• Bone marrow transplantation (BMT) is a critical treatment for hematological malignancies.
• Graft-versus-host disease (GvHD) is a significant complication following allogeneic BMT.
• Allergic conditions, such as asthma, can influence transplant outcomes and donor-recipient compatibility.

Observation:

• A patient with acute lymphoblastic leukemia received a bone marrow transplant from a donor with allergic asthma.
• The recipient developed acute graft-versus-host disease and presented with a significant population of monotypic IgE-lambda plasma cells post-transplant.
• Elevated serum IgE levels were noted in the recipient after transplantation, correlating with the donor's high IgE levels and allergic history.

Findings:

• Autopsy revealed a substantial increase in plasma cells within lymphoid tissues of the recipient.
• Monotypic IgE-lambda-containing plasma cells constituted a significant percentage (10-35%) of the plasma cell population in various lymphoid tissues.
• The donor's bone marrow showed a high proportion of IgE-positive plasma cells, indicating a potential source for the recipient's IgE-producing cells.

Implications:

• The findings suggest that the IgE-lambda plasma cell population in the recipient is likely of donor origin.
• This highlights a potential link between donor allergic profiles and post-transplant immune responses, specifically concerning IgE production.
• Further research is warranted to understand the mechanisms and clinical significance of donor-derived IgE-producing cells in transplant recipients.