• Hematopoietic stem cell regulation. I. Acute effects of hypoxic-hypoxia on CFU kinetics.

      Murphy, M J; Lord, Brian I; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester (1973-07)
    • Hematopoietic stem cell regulation. II. Chronic effects of hypoxic-hypoxia on CFU kinetics.

      Lord, Brian I; Murphy, M J; Paterson Laboratories, Christie Hospital and Holt Radium Institute, Manchester (1973-07)
    • The kinetics of hematopoietic stem cells during and after hypoxia. A model analysis.

      Loeffler, M; Herkenrath, P; Wichmann, H E; Lord, Brian I; Murphy, M J; Medizinische Universitätsklinik, Joseph-Stelzmann-Stasse 9, D-5000 Köln 41, Federal Republic of Germany. (1984-12)
      A previously described mathematical model of the hematopoietic stem cell system has been extended to permit a detailed understanding of the data during and after hypoxia. The model includes stem cells, erythroid and granuloid progenitors and precursors. Concerning the intramedullary feedback mechanisms two basic assumptions are made: 1) The fraction "a" of CFU-S in active cell cycle is regulated. Reduced cell densities of CFU-S, progenitors or precursors lead to an accelerated stem cell cycling. Enlarged cell densities suppress cycling. 2) The self renewal probability "p" of CFU-S is also regulated. The normal steady state is described by p = 0.5, indicating that on statistical average each dividing mother stem cell is replaced by one daughter stem cell, while the second differentiates. Diminished cell densities of CFU-S or enlarged densities of progenitors and precursors induce a more intensive self renewal (p greater than 0.5), such that the stem cell number increases. The self renewal probability declines (p less than 0.5) if too many CFU-S or too few progenitors and precursors are present. The model reproduces bone marrow data for CFU-S, BFU-E, CFU-C, CFU-E, 59 Fe-uptake and nucleated cells in hypoxia and posthypoxia. Although the ratio of differentiation into the erythroid and granuloid cell lines is kept constant in the model, a changing ratio of CFU-E and CFU-C results. The model suggests that stem cells and progenitor cells are regulated by a regulatory interference of erythropoiesis and granulopoiesis.