Accession Number : ADA300580

Title :   Megakaryocytopoiesis in Stem Cell Transplantation.

Descriptive Note : Annual rept. 16 Sep 94-15 Sep 95,

Corporate Author : NORTHWESTERN UNIV EVANSTON IL

Personal Author(s) : Cohen, Isaac

PDF Url : ADA300580

Report Date : 20 SEP 1995

Pagination or Media Count : 13

Abstract : Following high-dose chemotherapy for the treatment of malignant disease, reinfusion of peripheral blood stem cells collected during treatment with growth factors usually results in delayed platelet engrafiment as compared to neutrophil recovery. The overall objective of this research proposal is to improve the capacity of stem cells to engrafi ;the megakaryocytic lineage. To achieve this goal we carried out ex vivo expansion of megakaryocyte (Mk) progenitors from human bone marrow (BM) and peripheral blood stem cells (PBSO). Thanks to the availability of the recently cloned thrombopoietin (TPO), a growth factor specific for the MK lineage, we obtained highly enriched MK cultures in both hematopoietic sources. A synergistic effect between TPO and low doses of interleukin-3 (lL-3), but not stem cell factor (SOF), was observed in bone marrow cultures. Neither lL-3 nor SOF, at the concentrations used, enhanced TPO-stimulated megakaryocytopoiesis in PBSC. These observations will be used for ex vivo expansion of MKs to treat post-transplant-associated thrombocytopenia.

Descriptors :   *IN VIVO ANALYSIS, *BONE MARROW, *CANCER, *BLOOD CELLS, SOURCES, RECOVERY, CAPACITY(QUANTITY), PRECURSORS, DISEASES, CLONES, HUMAN BODY, EXPANSION, CULTURES(BIOLOGY), TRANSPLANTATION, HEMATOPOIETIC SYSTEM, GRANULOCYTES, SYNERGISM, GROWTH(PHYSIOLOGY), HEMATOPOIETIC CELLS.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE