Teruko Ishizaka

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Development of human mast cells in vitro.

T Furitsu; H Saito; A M Dvorak; L B Schwartz; A M Irani; J F Burdick; K Ishizaka; T Ishizaka (Profiled Authors: James Burdick; Kimishige Ishizaka; Teruko Ishizaka)

Department of Medicine, Johns Hopkins University, School of Medicine, Good Samaritan Hospital, Baltimore, MD.
Proceedings of the National Academy of Sciences of the United States of America 1989;86(24):10039-43.

Nucleated cells of human umbilical cord blood were cocultured with mouse skin-derived 3T3 fibroblasts. After 7-8 weeks in culture, when the number of the other hematopoietic cells declined, metachromatic granule-containing mononuclear cells appeared in the cultures, and the number of the cells increased up to 12 weeks. After 11-14 weeks in culture, the metachromatic mononuclear cells comprised a substantial portion of the cultured cells. These cells contained 1.8-2 micrograms of histamine per 10(6) cells and bore receptors for IgE. All of the cells contained tryptase in their granules. Electron microscopic analysis showed that these cells were mature human mast cells, clearly different from the basophilic granulocytes or eosinophils that arise in a variety of circumstances in cord blood cell cultures. Most of the cultured mast cells expressed some granules with regular crystalline arrays and contained both tryptase and chymase, and thus resembled human skin mast cells.

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