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International Journal of Cell Cloning, Vol 2, 126-140, Copyright © 1984 by AlphaMed Press

ORIGINAL ARTICLES

The recruitability and cell-cycle state of intestinal stem cells

CS Potten, C Chadwick, K Ijiri, S Tsubouchi and WR Hanson

Evidence is presented which suggests that the crypts of the small intestine contain at least two discrete but interdependent classes of stem cells, some with discrete cell kinetic properties and some with discrete radiation responses or radiosensitivities. Very low doses of X rays or gamma rays, or neutrons, kill a few cells in the stem cell regions of the crypt in a sensitive dose-dependent manner. Similar doses generate several different cell kinetic responses within either the clonogenic fraction or the cells at the stem cell position within the crypt. The cell kinetic responses range from apparent recruitment of G0 clonogenic cells into cycle, to a marked shortening of the average cell cycle of the cells at the stem cell position. It is suggested that the cell kinetic changes may be the consequence of the cell destruction.




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