A new mathematical equation was developed by which whole-body exposure to gamma radiation may be used to predict the survival characteristic of the intestinal crypt in mice pretreated with N-nitrosodiethylamine (NDEA). A computer fitting procedure showed the best agreement between predicted and observed curves. The results suggest that less cells may survive in crypts after gamma irradiation of NDEA-treated mice.
Military Institute of Hygiene and Epidemiology, Kozielska 4, 01-163 Warsaw, Poland
Bibliografia
1. POTTEN C.S. A comprehensive study of the radiobiological response of the murine (BCF1) small intestine. Int. J. Radiat. Biol. 6, 925, 1990.
2. POTTEN C.S., LOEFFLER M. Stem cells: attributes, cycles, spirals, pitfalls and uncertainties. Lessons for and from the crypt. Development 110, 1001, 1990.
3. PAULUS U., POTTEN C.S, LOEFFLER M. A model of the control of cellular regeneration in the intestinal crypt after perturbation based solely on local stem cell regulation. Cell Prolif. 25, 559, 1992.
4. GRUDZINSKI I.P., LAW F.C.P. Induction of cell death in the intestinal crypt of mice following oral administration of nitrate and nitrite. Bull. Environ. Contam. Toxicol. 60, 185, 1998.
5. GRUDZINSKI I.P. Analiza komórek klonogennych w kryptach jelita cienkiego gamma napromieniowanych myszy w zatruciu azotanem potasowym i azotynem sodowym. Lek. Wojsk, 74, 669, 1998.
7. LI Y.Q., FAN C.Y., O'CONNOR D.J, WINTON D.J., POTTEN C.S. Target cells for the cytotoxic effects of car cinogens in the murine small intestine. Carcinogenesis 13, 361, 1992.
8. POTTEN C.S, HENDRY J.H, MOORE J.V, CHWALINSKI S. Cytotoxic effects in gastro-intestinal epi thelium (as exemplified by small intestine). In Cytotoxic In suit to Tissue: Effects on cell lineage (C.S. Potten, and J.H. Hendry, Eds.), pp. 105-153. Churchill-Livingstone, Edin burgh, 1983..
9. WITHERS H.R, ELKIND M.M. Microcolony survival assay for cells of mouse intestinal mucosa exposed to radiation. Int. J. Radiat. Biol. 17, 261, 1970.
10. POTTEN C.S, REZVANI M, HENDRY J.H, MOORE J.V, MAJOR D. The correction of intestinal microcolony counts for variation in size. Int. J. Radiat. Biol. 3, 321, 1981.
11. MOORE J.V. Death of intestinal crypts and of their constituent cells after treatment by chemotherapeutic drugs. Br. J. Cancer 49, 25, 1984.
12. WITHERS H.R, MASON K.A., TAYLOR J.M.G. The number of clonogenic cells in a mouse jejunal crypt. Radiotherapy Oncol. 26, 238, 1993.
13. GILBERT C.W. Computer programs for fitting puck and probit survival curves. Int. J. Radiat. Biol. 16, 323, 1969.
14. ROBERTS S.A. Drfit: A program for fitting radiation survival models. Int. J. Radiat. Biol. 57, 1243, 1990.
15. HENDRY J.H, POTTEN C.S. Cryptogenic cells and prolif erative cells in intestinal epithelium. Int. J. Radiat. Biol. 6, 583, 1974.
16. HORNSEY S. The microcolony assay in small intestine. In: Cell clones, Eds. CS. Potten and JH. Hendry. Churchill-Livingstone. Edinburg. p. 44-49, 1985 .
17. PETO R, GRAY G, BRANTON P, GRASSO P. Dose and time relationships for tomor induction in the liver and esophagus of 4080 inbred rats by chronic ingestion of yV-nit- rosodiethylamine or TV-nitrosodimethylamine. Cancer Res. 51, 6452, 1991
18. COHEN SM. Cell proliferation and carcinogenesis. Drug Metab. Reviews 30, 339, 1998.