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. 1984 Nov 1;223(3):911–920. doi: 10.1042/bj2230911

Biosynthesis, transport and processing of myeloperoxidase in the human leukaemic promyelocytic cell line HL-60 and normal marrow cells.

I Olsson, A M Persson, K Strömberg
PMCID: PMC1144379  PMID: 6095812

Abstract

The processing and intracellular transport of myeloperoxidase were studied in the human promyelocytic leukaemia cell line HL-60 and in normal marrow cells labelled with [35S]methionine or [14C]leucine. Myeloperoxidase was precipitated with antimyeloperoxidase serum; the immunoprecipitates were subjected to sodium dodecyl sulphate/polyacrylamide-gel electrophoresis and radiolabelled myeloperoxidase visualized by fluorography. During a 1 h pulse, myeloperoxidase was labelled in a chain of apparent Mr 90 000. With a subsequent chase, the Mr 90 000 polypeptide disappeared and was replaced by chains of Mr 62 000 and 12 400 corresponding roughly to the size of neutrophil myeloperoxidase subunits. The identification of the radioactive polypeptides as different forms of myeloperoxidase was established also by the similarity in patterns generated by partial proteolysis with V8 proteinase from Staphylococcus aureus. Processing of myeloperoxidase in HL-60 was slow; mature polypeptides were significantly increased only after 6 h. Another myeloperoxidase chain of apparent Mr 82 000 was an intermediate precursor or degradation form. Pulse-chase experiments in combination with sucrose-density-gradient separations of homogenates showed that the Mr 90 000 precursor was located in light density organelles only and not in granule fractions, whereas the Mr 82 000 precursor was located only in intermediate density organelles, suggesting that the latter is a product of the former. Processed mature myeloperoxidase was concentrated in the granule fraction, but some occurred in lower density organelles, which may indicate processing during intracellular transport. Only the Mr 90 000 polypeptide was secreted into the culture medium; this was also the only form found in the cytosol fraction.

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