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The Journal of Immunology, Vol 149, Issue 7 2466-2472, Copyright © 1992 by American Association of Immunologists

ARTICLES

Translation and granule localization of mouse mast cell protease-5. Immunodetection with specific antipeptide Ig

HP McNeil, DP Frenkel, KF Austen, DS Friend and RL Stevens
Department of Medicine, Harvard Medical School, Boston, MA 02115.

An antibody to mouse mast cell protease-5 (MMCP-5) was obtained by immunizing a rabbit with a 17-residue synthetic peptide corresponding to the unique amino acid sequence at residues 146 to 162 in this serine protease. After affinity purification, anti-MMCP-5(146-162) Ig reacted in SDS-PAGE immunoblots to recombinant MMCP-5 and to the native MMCP-5 protein present in the lysates of mouse serosal mast cells and the MC5 line of Kirsten sarcoma virus-immortalized mouse mast cells. Immunocytochemical staining localized MMCP-5 to the cytoplasmic granules of serosal mast cells and Kirsten sarcoma virus-immortalized mouse mast cells. Because mouse bone marrow-derived mast cells express abundant amounts of MMCP-5 mRNA, anti-MMCP-5(146-162) Ig was used to study the translation and granule accumulation of this protease when progenitor cells differentiate into these immature mouse mast cells. Maximal expression of MMCP-5 mRNA occurred after bone marrow cells had been cultured for 2 wk in IL-3-rich WEHI-3 cell conditioned medium, and MMCP-5 protein was detected in these cells. However, electron- microscopic analysis with gold-labeled antibody revealed that the amount of MMCP-5 in the individual granules of bone marrow-derived mast cells varied. The highest concentration of MMCP-5 was found in the most electron-dense secretory granules of the cells. These studies demonstrate the ultrastructural localization of the earliest transcribed mouse mast cell chymase, MMCP-5, and its granule accumulation during the differentiation of mouse bone marrow progenitor cells into immature mouse mast cells.


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