Abstract
Previous studies from our laboratory have suggested that the numbers of CFU-M do not increase primarily in response to acute thrombocytopenia. To determine the effect and specificity of prolonged thrombocytopenia on CFU-M number, mice were given 4 intravenous injections on alternate days of multiply absorbed rabbit anti-mouse platelet serum (APS), while control animals received a similar regimen of rabbit anti-mouse red cell serum (ARS), normal rabbit serum (NRS), or phosphate-buffered saline (PBS). Two days aftefcthe final injection, the mean platelet count was.0.314 ± 0.129 × 106/ul in animals given APS vs. 1.105 ± 0.048 × 106/ul in animals given other regimens. The numbers of CFU-M, day 7 and day 14 erythroid burst forming cells (BFU-E), and granulocyte-macrophage colony forming cells (CFU-C) were determined in humerus and spleen.The generalized increase in progenitor cells in marrow in response to APS together with increases in CFU-M in spleen following ARS and NRS indicate that these cells may respond nonspecifically to foreign protein. The data suggest that the elevation in CFU-M numbers with chronic immune thrombocytopenia is at least partially independent of the platelet count.
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