Influence of irradiation or thymidine (TdR) on the pattern of 3H-TdR incorporation at each cell position in the crypts of the small intestine of the mouse.
AffiliationDepartment of Epithelial Biology, Paterson Institute for Cancer Research, Christie Hospital & Holt Radium Institute, Manchester, M20 9BX, U.K.
MetadataShow full item record
AbstractUsing autoradiographic methods it was noted that S phase cells at the bottom of the crypts in the small intestine were the most efficient scavengers of exogenous injected thymidine. The efficiency of the incorporation of 3H-TdR (salvage pathway of DNA synthesis) by cells at the crypt base (stem cell zone) was twice as high as for the S phase cells at the top of the crypt (maturing proliferative cells). There were no such position-dependent differences in incorporation of 3H-UdR (de novo pathway of DNA synthesis). Radiation (0.75-5.0 Gy 137Cs gamma-rays) inhibited the incorporation of 3H-TdR very rapidly and this was also cell-position dependent. The cells at the bottom of the crypt were the most affected. The injection of cold thymidine before 3H-TdR changed the pattern of the incorporation of 3H-TdR along the side of the crypt in a very similar way to radiation, and the grain number was decreased predominantly in the cells at lower positions. The possibility of the existence of a regional gradient of endogenous thymidine (reutilization from intestinal sources), and the influence of irradiation on the gradient of thymidine incorporation resulting from direct and abscopal effects of whole body exposure, are discussed.
CitationInfluence of irradiation or thymidine (TdR) on the pattern of 3H-TdR incorporation at each cell position in the crypts of the small intestine of the mouse. 1987, 51 (2):243-54 Int J Radiat Biol Relat Stud Phys Chem Med
JournalInternational Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine
- Cell position dependence of labelling thymidine nucleotides using the de novo and salvage pathways in the crypt of small intestine.
- Authors: Chwalinski S, Potten CS
- Issue date: 1986 Nov
- In vitro DNA synthesis by megaloblastic bone marrow: effect of folates and cobalamins on thymidine incorporation and de novo thymidylate synthesis.
- Authors: Das KC, Herbert V
- Issue date: 1989 May
- Double labelling with bromodeoxyuridine and [3H]-thymidine of proliferative cells in small intestinal epithelium in steady state and after irradiation.
- Authors: Chwalinski S, Potten CS, Evans G
- Issue date: 1988 Sep
- Stimulation by tumor necrosis factor of HL-60 thymidine salvage pathway metabolism dissociated from proliferation.
- Authors: Elias L
- Issue date: 1988 Jul
- A correction: inhibitory activity in the conditioned medium of embryonic chick bones is due to thymidine.
- Authors: Mohan S, Linkhart T, Wergedal J, Baylink D
- Issue date: 1984 Nov