Granulocytic colonies on macrophage-coated membranes

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Abstract
A macrophage cell coating covering a cellulose acetate disk was an effective microenvironment for the production of peroxidase‐positive hematopoietic colonies. These developed after intraperitoneal injection of marrow cells with a linear cell relationship of dose to colonies formed. One colony formed for every 2,000 nucleated marrow cells injected. Observation of colony formation daily showed a steady increase in number and size until seven days after cell inoculation. X‐irradiation (400 rads) eliminated intrinsic colony formation in BALB/c mice. Irradiation of the donor of the ip marrow cells resulted in a Do of 95 rads. Treatment of the marrow donor with cytosine arabino‐side had a suppressive effect on colony formation as did treatment of the host animal after receipt of the ip marrow. These results indicate that the precursor of the granulocytic colonies seen in the macrophage layers are more similar to committed granulocytic precursors than to the pluripotential stem cell.