title: Association between colony forming units-granulocyte macrophage expression of Ia-like (HLA-DR) antigen and control of granulocyte and macrophage production. A new role for prostaglandin E.
abstract: The expression of Ia-like antigens on human colony forming units-granulocyte macrophage (CFU-GM) is related to S-phase of the cell cycle, and associated with the control of normal granulocyte and macrophage production by prostaglandin E and acidic isoferritins in vitro. Ia-antigen expression by CFU-GM is lost within 3-6 h of culture at 37 degrees C and occurs simultaneously with loss of responsiveness to inhibition by these factors. Culture of bone marrow CFU-GM in a limited exposure suspension culture with 1 microM-1pM prostaglandin E (PGE1 or PGE2), but not prostaglandin F2 alpha or dibutyryl-cyclic-3'-5'-AMP results in the detection of CFU-GM Ia-antigen after 24 h. Antigen expression is associated with an absolute increase in total and S-phase CFU-GM, and restoration of responsiveness to inhibition by prostaglandin E and acidic isoferritins. The detection of Ia-antigen on CFU-GM after suspension culture with prostaglandin E results both from Ia-antigen reexpression as well as stimulation of noncycling cells to enter S-phase, express Ia-antigen and give rise to CFU-GM sensitive to inhibition by prostaglandin E and acidic isoferritins. The sensitivity of CFU-GM to inhibition by these factors after suspension culture with prostaglandin E is identical to that of the same cells tested prior to the suspension culture. These studies provide evidence for a direct regulatory association between Ia-antigen expression and control of myeloid progenitor cell differentiation, and suggest a role for prostaglandin E in the control of CFU-GM cell cycle, Ia-antigen expression, and growth regulation.
mesh_terms: D003994:Bucladesine / Q000494:pharmacology; D002453:Cell Cycle / Q000187:drug effects; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D015237:Dinoprost; D004305:Dose-Response Relationship, Drug; D005293:Ferritins / Q000494:pharmacology; D006098:Granulocytes / Q000502:physiology*; D006410:Hematopoiesis; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D008264:Macrophages / Q000502:physiology*; D011458:Prostaglandins E / Q000494:pharmacology*; D011460:Prostaglandins F / Q000494:pharmacology
chemical_list: D000949:Histocompatibility Antigens Class II; D011458:Prostaglandins E; D011460:Prostaglandins F; D003994:Bucladesine; D005293:Ferritins; D015237:Dinoprost