title: Cellular responsiveness to stimulation in vitro: increased responsiveness to colony stimulating factor of bone marrow colony-forming cells treated with surface-active agents and cyclic 3'5' AMP.
abstract: Addition of low concentrations (10 ng/ml) of saponin or Tween 80 to stimulated cultures of normal mouse bone marrow in agar increased the number of granulocyte-macrophage colonies which developed. Addition of cyclic AMP or dibutyryl cyclic AMP in low concentration (10(-8) to 10(-10) M) also enhanced colony numbers although concentrations above 10(-5) M were inhibitory. enhancement was found when marrow cells were pre-treated with these agents and cultured in their absence. The agents did not stimulate colony development in the absence of colony-stimulating factor and enhancement of colony number occurred only in cultures containing a concentration of colony-stimulating factor which was sub-optimal in terms of maximum colony development. There was no indication of increased colony-stimulating factor production by treated marrow cells under the experimental conditions used to show colony enhancement. It was concluded that the agents caused an increased responsiveness of colony-forming cells to colony-stimulating factor.
mesh_terms: D000249:Adenosine Monophosphate / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D001853:Bone Marrow / Q000187:drug effects*; D001854:Bone Marrow Cells; D003994:Bucladesine / Q000494:pharmacology; D002999:Clone Cells / Q000187:drug effects; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D000242:Cyclic AMP / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006023:Glycoproteins / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009712:Nucleotides, Cyclic / Q000494:pharmacology; D011092:Polyethylene Glycols / Q000494:pharmacology*; D011136:Polysorbates / Q000494:pharmacology*; D012503:Saponins / Q000494:pharmacology*; D013268:Stimulation, Chemical; D013696:Temperature
chemical_list: D003115:Colony-Stimulating Factors; D006023:Glycoproteins; D009712:Nucleotides, Cyclic; D011136:Polysorbates; D012503:Saponins; D011092:Polyethylene Glycols; D000249:Adenosine Monophosphate; D003994:Bucladesine; D000255:Adenosine Triphosphate; D000242:Cyclic AMP