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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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