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Cultured human myeloid leukemia (HL60) cells were characterized using ultrastructural cytochemical methods and differences identified when cells were compared for low (17 to 47), middle (69 to 100), and high (214 to 244) passages or to normal promyelocytes aspirated from bone marrow. Endoplasmic reticulum and transition structures (pre-Golgi compartment) of HL60 cells stained positively for peroxidase using diaminobenzidine but stained sparsely for reducing groups with osmium-zinc iodide. Staining of Golgi elements was relatively indistinct with diaminobenzidine and strong with osmium-zinc iodide, in comparison to freshly harvested promyelocytes which have intense diaminobenzidine and osmium-zinc iodide staining of the pre-Golgi and Golgi compartments.
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