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Factor XIII A subunit (FXIIIA) is found in plasma, platelets, and monocytes. The hemopoietic contributions to FXIIIA in these components were studied in patients transplanted with marrows from donors with different FXIIIA phenotypes. In three patients with successful engraftment (by DNA genotyping, red cell phenotyping, and cytogenetic studies) platelet and monocyte FXIIIA changed to donor phenotypes with hematologic recovery. Thus, FXIIIA in platelets and monocytes is synthesized de novo and/or from their progenitor cells. Plasma FXIIIA phenotype change after transplantation was more complex. Patient I changed from phenotype 1-1 (one electrophoretically fast band) to 1-2 (three bands) in 115 d; patients 2 and 3 did not change completely from phenotype 1-2 to 1-1 in up to 458 d, but did show enrichment of the fastest band. Thus, while there is a definite contribution of donor hemopoiesis to plasma FXIIIA, another source of recipient FXIIIA appears to be present to delay or prevent the phenotype change.

Hemopoietic origin of factor XIII A subunits in platelets, monocytes, and plasma. Evidence from bone marrow transplantation studies.