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Regulation and Processing of a Precursor Form of Eosinophil Granule Major Basic Protein (ProMBP) in Differentiating Eosinophils

Pamela Popken-Harris, James Checkel, David Loegering, Benjamin Madden, Margaret Springett, Gail Kephart, and Gerald J. Gleich

From the Departments of Immunology, Internal Medicine, and Biochemistry and Molecular Biology, Mayo Clinic and Mayo Foundation, Rochester, MN.

The cDNA for eosinophil granule major basic protein (MBP) encodes a prepromolecule with a total length of 222 amino acids (preproMBP). PreproMBP includes a secretory leader of 15 amino acids, an acidic propiece of 90 amino acids, and a basic MBP portion of 117 amino acids. The function of the propiece, which has a predicted pI of 3.9, is unknown, but it gives proMBP an overall acidic charge. Because proMBP is not found in mature eosinophils, we analyzed eosinophil differentiation in interleukin-5 (IL-5)-stimulated umbilical cord stem cells cultured for 24 days. By immunofluorescence, proMBP appeared by day 6 and peaked on day 18, whereas MBP was prominent at days 12 to 24. By day 6, Western blots detected heterogeneous glycosylated 33-kD proMBP; its peak expression occurred on day 12. Western blots showed sequential processing of 33-kD proMBP to an 18-kD intermediate form and finally to 14-kD MBP. By dual label immunoelectron microscopy, proMBP was localized primarily to large uncondensed eosinophil granules, whereas MBP was localized to granules containing a condensed central area. Thus, proMBP is likely expressed and processed as the granule condenses in a multistep process to 14-kD MBP in differentiating eosinophils.

Blood, Vol. 92 No. 2 (July 15), 1998: pp. 623-631
© 1998 by the American Society of Hematology.


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