CHARACTERIZATION OF ERYTHROPOIETIN PRODUCED BY IW32 MURINE ERYTHROLEUKEMIA-CELLS

  • 1 January 1984
    • journal article
    • research article
    • Vol. 64  (2) , 341-347
Abstract
IW32 is a recently described murine erythroleukemia cell line that produces an erythropoietic factor similar to erythropoietin by in vivo and in vitro bioassays and without species specificity. Biochemical characteristics of IW32 erythropoietic factor and sheep or mouse plasma erythropoietins were compared. Murine colonies derived from erythroid colony-forming units (CFU-E) in plasma clot culture were used as the bioassay ssytem. Both IW32 erythropoietic factor and sheep or mouse plasma erythropoietins were compared. Murine colonies derived from erythroid colony-forming units (CFU-E) in plasma clot culture were used as the bioassay system. Both IW32 erythropoietic factor and sheep plasma erythropoietin were stable in the pH range of 3-10, after exposure to denaturing agents (8 mol/l urea, 4 mol/l guanidine hydrochloride, 1% sodium dodecyl sulfate), to a reducing agent (0.1 mol/l 2-mercaptoethanol) and to an oxidizing agent (5 mmol/l sodium metaperiodate). Only the combination of 0.1 mol/l 2-mercaptoethanol and 1% sodium dodecyl sulfate resulted in a significant loss of activity. IW32 erythropoietic factor and murine plasma erythropoietin were similarly precipitated by ethanol and ammonium sulfate. IW32 erythropoietic factor eluted as a single major peak after gel exclusion chromatography, with an estimated MW of 45,000 daltons. Results were identical using supernatants from cultures in the presence of and absence of fetal calf serum. The supernatant of IW32 cells cultured without serum induced erythroid colonies after 7 days on normal human bone marrow nonadherent mononuclear cells cultured in serum-free conditions. IW32 cells apparently produce an authentic erythropoietin. This cell line would be very useful for the study of murine erythropoietin.

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