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Regulation of granulopoiesis by autologous intact blood t cells a comparison between their influence on blood and marrow cfu c

, : Regulation of granulopoiesis by autologous intact blood t cells a comparison between their influence on blood and marrow cfu c. Dokkyo Journal of Medical Sciences 14(1): 19-26

To evaluate the variability of regulatory effect of normal intact T lymphocytes (T cells) on granulopoiesis, we examined the effect of peripheral blood (PB) T cells on growth of autologous PB granulopoietic progenitor cells (colony-forming unit in culture, CFU-C) and autologous bone marrow (BM) CFU-C. Either PB or BM non-T cell fractions containing CFU-C were cocultured with autologous PB-T cells in semi-solid agar culture in the presence of an exogenous source of colony stimulating factor (CSF). Neutrophil (N) and eosinophil (Eo) aggregates (clusters and/or colonies) were counted separately. The T cells consistently promoted the formation of PB-N, PB-Eo and BM-Eo aggregates in all the studies. However, the effect of the T cells on BM-N aggregtes varied: the formation of big colonies was consistently promoted, while that of small colonies was not significantly affected. These results suggest that intact PB-T cells promote the proliferation of only a fraction of immature N progenitor cells, although they promote the growth of Eo progenitor cells regardless of the maturity.

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