title: Differentiation of a human monocyte-like cell line by (2'-5') oligoisoadenylate.
abstract: Treatment of a human monocyte-like cell line (U-937) by (2'-5')ApApA, the 5' dephosphorylated product of (2'-5')oligo-isoadenylate [oligo(A)] synthetase, an interferon-induced enzyme, was able to induce differentiation, mimicking the effect of interferon treatment. Treatment of U-937 cells with (2'-5')ApApA resulted in morphologic changes, new (monocyte-associated) membrane antigen expression, and acquisition of the capacity to mediate antibody-dependent cellular cytotoxicity (ADCC). (2'-5')ApA and (3'-5')ApApA were without effect. A myeloid cell line (HL-60) which differentiates in response to other agents, but not to alpha-interferon, was not able to differentiate in response to (2'-5')ApApA, despite the ability of interferon to induce (2'-5')oligo (A) synthetase.
mesh_terms: D000920:Antibody-Dependent Cell Cytotoxicity; D000954:Antigens, Surface / Q000032:analysis; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D004790:Enzyme Induction; D006801:Humans; D007370:Interferon Type I / Q000494:pharmacology; D009000:Monocytes / Q000166:cytology* / Q000187:drug effects / Q000276:immunology; D009841:Oligonucleotides / Q000494:pharmacology*; D009843:Oligoribonucleotides / Q000494:pharmacology*; D011118:Polynucleotide Ligases / Q000096:biosynthesis
chemical_list: C018354:(2'-5')oligoisoadenylate; D000954:Antigens, Surface; D007370:Interferon Type I; D009841:Oligonucleotides; D009843:Oligoribonucleotides; C021906:(2'-5')oligo-isoadenylate synthetase; D011118:Polynucleotide Ligases