title: Megakaryocyte colony formation by bone marrow progenitors in myelodysplastic syndromes.
abstract: Megakaryocytic colony formation by precursor cells from the bone marrow was investigated in 10 patients with a myelodysplastic syndrome. All but one exhibited abnormal colony formation: four showed no colony formation at all, while a decreased number of colonies was noticed in five. All of the patients showed defective colony formation by erythroid progenitors, but only four showed clearly abnormal granulocyte-macrophage colony formation. The defect in megakaryocytic progenitors seems to be more akin to the defects occurring in erythroid progenitors than to the defects seen in the granulocyte-macrophage lineage.
mesh_terms: D000368:Aged; D000753:Anemia, Refractory / Q000473:pathology*; D000754:Anemia, Refractory, with Excess of Blasts / Q000473:pathology; D001853:Bone Marrow / Q000473:pathology*; D002478:Cells, Cultured; D004912:Erythrocytes / Q000473:pathology; D005260:Female; D006098:Granulocytes / Q000473:pathology; D006412:Hematopoietic Stem Cells / Q000473:pathology*; D006801:Humans; D008264:Macrophages / Q000473:pathology; D008297:Male; D008533:Megakaryocytes / Q000473:pathology*; D008875:Middle Aged