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Cell kinetic study on GM colonies using autoradiography and collagen gel culture with special reference to unique proliferation of eosinophils
Author(s) -
Izumi Tomoyuki,
Suda Tetsuo,
Shiome Shougo,
Maekawa Tadashi
Publication year - 1986
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041260202
Subject(s) - eosinophil , monocyte , biology , macrophage , cytoplasm , cell culture , immunology , microbiology and biotechnology , in vitro , biochemistry , genetics , asthma
Using a newly developed technique of autoradiography and collagen gel culture, a kinetic study on human GM colonies was attempted. Colonies of immature cells appeared first on day 5. The number of mixed colonies (mixture of immature cells, neutrophils, and/or monocyte‐macrophages) and neutrophil colonies attained a maximum on days 8 to 10 and a broad peak of monocyte‐macrophage colonies was observed on days 11 to 16. Eosinophil colonies appeared first on day 12, reached a maximum on day 18, and then gradually decreased. A detailed analysis of the order of appearance of the colonies suggests that mixed, neutrophil and monocyte‐macrophage colonies originate from immature cell colonies or clusters, while eosinophil colonies do not. An autoradiographic study was designed to study the proliferation characteristics of each colony. Labeling indices (LI) with 3 H‐TdR of the cells in immature cell colonies were always high. LI of the cells in differentiated colonies such as neutrophil, monocyte‐macrophage, and mixed colonies were low throughout the observation period. In contrast, LI of the cells in eosinophil colonies were constantly high regardless of the size of cell aggregates and the duration of the culture period. Both mitotic indices and mean grain counts on the nuclei of eosinophils were similar to those of immature cells. These results suggest that eosinophil colonies develop from their own small clusters and that eosinophils retain a fairly good proliferative capacity even when differentiated to the level in which specific granules appear in the cytoplasm.