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The role of autologous helper and suppressor T cells in the regulation of human granulopoiesis

Helper and suppressor T cells play a physiological role in immunoregulation and possibly in other biological systems. Previous studies have suggested that unfractionated T cells influence human blood cell formation in vitro. Subpopulations of such cells (TM and TG cells) were prepared by immune ox erythrocyte resetting techniques. Co‐cultures were established in semi‐solid agar with autologous null lymphocytes as a source of granulocyte—macrophage progenitor cells (CFU‐GM). TM (helper) cells produced an increase and TG (suppressor) cells a decrease in the expression of CFU‐GM as reflected in the number of GM colonies generated by comparison with cultures of null lymphocytes alone. These data point to a contribution from T lymphocyte subpopulations to the physiological regulation of human granulopoiesis.