title: CSF-1 stimulates Na+K+-ATPase mediated 86Rb+ uptake in mouse bone marrow-derived macrophages.
abstract: 86Rb+ was used as an isotopic tracer for the measurement of K+-uptake into quiescent murine bone marrow-derived macrophages. 86Rb+ uptake was inhibited by ouabain indicating a Na+K+-ATPase is being measured. In support of this finding, increased sensitivity to ouabain inhibition was seen when the K+ content of the medium was reduced. A purified colony stimulating factor (CSF-1) was shown to stimulate the ouabain-sensitive 86Rb+ uptake in a dose-dependent manner. Such colony stimulating factor stimulation of 86Rb+ (K+) influx was rapid, with a maximal effect seen 10 minutes after growth factor addition followed by a gradual decrease. Thus increased Na+K+-ATPase activity was an early response of macrophages to the colony stimulating factor.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D003115:Colony-Stimulating Factors / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D007700:Kinetics; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism; D051379:Mice; D010042:Ouabain / Q000494:pharmacology; D011188:Potassium / Q000378:metabolism; D012413:Rubidium / Q000378:metabolism*; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*; D013997:Time Factors
chemical_list: D003115:Colony-Stimulating Factors; D010042:Ouabain; D000254:Sodium-Potassium-Exchanging ATPase; D012413:Rubidium; D011188:Potassium