title: Platelets but not monocytes contribute to the plasma levels of factor XIII subunit A in patients undergoing autologous peripheral blood stem cell transplantation.
abstract: Factor XIII subunit A (FXIII A) is synthesized by megakaryocytes, and monocytes/macrophages. In addition, the liver has been reported as an extrahaematopoietic source of FXIII A. At present, the extent of contribution of either haematopoietic or extrahaematopoietic sources to the plasma FXIII A level is unknown. We studied the effect of bone marrow aplasia due to high-dose chemotherapy followed by autologous peripheral blood stem cell transplantation (ASCT) on plasma FXIII A activity and concentration in 20 patients with haematological or solid tumour malignancies. A multiple linear regression model was used to assess the effect of gender, age, malignancy and treatment types, platelet and monocyte counts, abnormal liver function tests, prothrombin time, and number of platelet transfusions on FXIII activity measured in plasma before and following ASCT. Significant correlation between platelet counts and FXIII A activity in plasma was observed (r = 0.51, P = 0.0001), which remained after the adjustment for the aforementioned parameters (multiple R = 0.52, P = 0.0001). In contrast, no significant correlation between FXIII A levels and monocyte counts was observed (r = 0.19), and this lack of correlation persisted after the adjustment. These results suggest that in the ASCT model, following myeloablation, platelets but not monocytes are the haematopoietic cells that contribute significantly to plasma FXIII A levels. In addition, extra-haematopoietic sources of FXIII synthesis may also contribute to FXIII levels in plasma.
authors.affiliation: Institute of Thrombosis and Hemostasis and Bone Marrow Transplantation Department, Sheba Medical Center, Tel Hashomer, and Sackler Faculty of Medicine, Tel Aviv University, Israel. aidanbal@hotmail.com
authors.forename: Aida
authors.initials: A
authors.lastname: Inbal
authors.forename: László
authors.initials: L
authors.lastname: Muszbek
authors.forename: Aharon
authors.initials: A
authors.lastname: Lubetsky
authors.forename: Eva
authors.initials: E
authors.lastname: Katona
authors.forename: Itai
authors.initials: I
authors.lastname: Levi
authors.forename: Levente
authors.initials: L
authors.lastname: Kárpáti
authors.forename: Arnon
authors.initials: A
authors.lastname: Nagler
mesh_terms: D001792:Blood Platelets / Q000378:metabolism / Q000502:physiology*; D005176:Factor XIII / Q000032:analysis* / Q000096:biosynthesis*; D019337:Hematologic Neoplasms / Q000097:blood / Q000628:therapy; D006801:Humans; D007958:Leukocyte Count; D009000:Monocytes / Q000502:physiology; D036102:Peripheral Blood Stem Cell Transplantation; D010976:Platelet Count; D012044:Regression Analysis; D013997:Time Factors; D014182:Transplantation, Autologous
chemical_list: C064015:factor XIII subunit A; D005176:Factor XIII