TY - JOUR
T1 - Late effects of irradiation in mouse jejunum
AU - Reynaud, Agnes
AU - Travis, Elizabeth L.
N1 - Funding Information:
We wish to acknowledge Barbara Coolidge, Laboratory of Pathology, Frederick Cancer Research Center, Frederick, MD, who prepared the slides, Dr Timothy Triche, Department of Pathology, National Cancer Institute, Bethesda, MD, who helped to carry out the morphometric analysis, Mr Leonard Kedda, National Institutes of Health, Bethesda, MD, who kindly supplied the misonidazole used in this study, and Rozanne Goddard for her assistance in the completion of this manuscript. This work was supported in part by NIH grant RR5511 21, account 149583.
PY - 1984
Y1 - 1984
N2 - The response of mouse jejunum at intervals up to 1 year after single priming doses of X-rays has been assessed by crypt survival after retreatment with single doses of X-rays and morphometric analysis of changes in the intestinal submucosa. The first priming dose was given as a single dose to the whole abdomen. To assess crypt survival, groups of mice were retreated to the whole body with a range of test doses 2, 6 or 12 months later, while other groups of mice were given only the priming doses. These data were compared to crypt survival in mice not previously irradiated. The crypt dose-survival curves in mice re-irradiated at all three intervals after priming irradiation were displaced to higher doses in pre-treated than in non-pre-treated mice and were characterized by higher D0 values. Misonidazole given before the test exposure reversed this effect so that the dose survival curve for crypts in pre-treated mice were superimposed on that for mice not previously irradiated, suggesting that the increase in isoeffect dose and the change in the D0 in previously exposed mice was due to crypt hypoxia. Quantification of the area of the submucosa showed that its area was increased at all three times after the priming doses and was a result of collagen deposition and oedema. Thus, the hypoxia in the crypts was probably secondary to these changes. Deaths began at 6-7 months after priming irradiation and were due to intestinal obstruction and stenosis. Thus, as in other tissues, two phases of injury can be assayed in the intestine of experimental animals.
AB - The response of mouse jejunum at intervals up to 1 year after single priming doses of X-rays has been assessed by crypt survival after retreatment with single doses of X-rays and morphometric analysis of changes in the intestinal submucosa. The first priming dose was given as a single dose to the whole abdomen. To assess crypt survival, groups of mice were retreated to the whole body with a range of test doses 2, 6 or 12 months later, while other groups of mice were given only the priming doses. These data were compared to crypt survival in mice not previously irradiated. The crypt dose-survival curves in mice re-irradiated at all three intervals after priming irradiation were displaced to higher doses in pre-treated than in non-pre-treated mice and were characterized by higher D0 values. Misonidazole given before the test exposure reversed this effect so that the dose survival curve for crypts in pre-treated mice were superimposed on that for mice not previously irradiated, suggesting that the increase in isoeffect dose and the change in the D0 in previously exposed mice was due to crypt hypoxia. Quantification of the area of the submucosa showed that its area was increased at all three times after the priming doses and was a result of collagen deposition and oedema. Thus, the hypoxia in the crypts was probably secondary to these changes. Deaths began at 6-7 months after priming irradiation and were due to intestinal obstruction and stenosis. Thus, as in other tissues, two phases of injury can be assayed in the intestine of experimental animals.
KW - Jejunum
KW - Residual injury
KW - Retreatment
UR - http://www.scopus.com/inward/record.url?scp=0021212034&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021212034&partnerID=8YFLogxK
U2 - 10.1080/09553008414551201
DO - 10.1080/09553008414551201
M3 - Article
C2 - 6332087
AN - SCOPUS:0021212034
SN - 0955-3002
VL - 46
SP - 125
EP - 134
JO - International journal of radiation biology
JF - International journal of radiation biology
IS - 2
ER -