title: Human placental conditioned medium reverses apparent commitment to differentiation of human promyelocytic leukemia cells (HL60).
abstract: Using a system of sequential daughter cell transfers in semisolid medium, we have analyzed self-renewal and differentiation of human promyelocytic leukemia cells (HL60) in presence of all-trans retinoic acid and human placental conditioned medium (HPCM). We find that retinoic acid induces coordinated losses of self-renewal potential which are followed by phenotypic differentiation. The latter occurs as an all-or-none event and is reversible in the presence of HPCM. Thus, HL60 cells that apparently had terminally differentiated (as estimated by the ability to reduce nitroblue tetrazolium [NBT]) can lose their differentiation marker and reenter the proliferative pool.
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D003470:Culture Media; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics* / Q000473:pathology; D014411:Neoplastic Stem Cells / Q000276:immunology*; D010920:Placenta; D014212:Tretinoin / Q000494:pharmacology
chemical_list: D003470:Culture Media; D014212:Tretinoin