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Human bone marrow was fractionated by counterflow centrifugation into 16 fractions with increasing cell size. Three distinct subpopulations could be recognized: small lymphocytic cells, medium-sized nucleated erythroid cells and large myeloid elements. DNA-flowcytometry and 3H-thymidine uptake showed that within the erythroid and myeloid cell populations counterflow centrifugation separates each population according to the cell cycle phase. Hypotonic treatment of bone marrow for removal of the erythroid nucleated cells resulted in a complete abrogation of the proliferating erythroid cell population. Counterflow centrifugation also separates the small non-proliferating myeloid and erythroid committed stem cells from the larger proliferating stem cells. It appeared feasible to separate the small lymphocytic cells from the majority of BFU-E and CFU-GM, due to the larger size of the proliferating normoblasts and the committed progenitor cells. Elimination of the mature lymphocytes from the haematopoietic stem cells by counterflow centrifugation may offer an alternative approach to the prevention of graft versus host disease (GvHD).
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