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dc.contributor.authorPotten, Christopher Sen
dc.contributor.authorChadwick, Caroline Aen
dc.date.accessioned2010-04-09T09:19:47Z
dc.date.available2010-04-09T09:19:47Z
dc.date.issued1994
dc.identifier.citationSmall intestinal growth regulatory factors extracted by simple diffusion from intact irradiated intestine and tested in vivo. 1994, 10 (1):63-75 Growth Factorsen
dc.identifier.issn0897-7194
dc.identifier.pmid8179932
dc.identifier.doi10.3109/08977199409019604
dc.identifier.urihttp://hdl.handle.net/10541/96105
dc.description.abstractFollowing a dose of 8 Gy of gamma-rays delivered to the entire body of BDF1 mice, the proliferative activity in the crypts of the small intestine changes. The labelling and mitotic activity both fall precipitously, but in the lower regions of the crypt recovery from this fall begins soon after irradiation with cyclic fluctuations. Forty-five to fifty hours after irradiation, control levels are reached after which there is an overshoot. The number of clonogenic cells in the crypt shows a somewhat similar pattern of regeneration and overshoot. It has been assumed that these changes reflect the production of endogenous signals for proliferation and inhibition and these might be extracted by diffusion through the gut wall. We report here that at appropriate times after irradiation stimulatory and inhibitory extracts could be prepared. Appropriate in vivo assay techniques have been developed for testing inhibitors or stimulators making similar use of the patterns of proliferative regeneration after irradiation. Extracts prepared at either 15 h or 39 h after irradiation, i.e. during the phase of active regeneration are quite potently stimulatory on recipient animals 96 h after irradiation (i.e., following the decline from a proliferative overshoot) when injected twice 3 h apart. Extract prepared 72 h after irradiation (shortly after the overshoot peak) is strongly inhibitory when tested on unirradiated animals, or animals 90 h after irradiation, when injected four times 2 h apart. An accompanying paper shows that the stimulatory extract is powerfully active on intestinal cell lines. The in vitro approach is currently being used to characterise the stimulatory factor.
dc.language.isoenen
dc.subject.meshAnimals
dc.subject.meshCell Division
dc.subject.meshCesium Radioisotopes
dc.subject.meshDiffusion
dc.subject.meshGamma Rays
dc.subject.meshGrowth Substances
dc.subject.meshIntestine, Small
dc.subject.meshMice
dc.subject.meshMitotic Index
dc.subject.meshTissue Extracts
dc.subject.meshWhole-Body Irradiation
dc.titleSmall intestinal growth regulatory factors extracted by simple diffusion from intact irradiated intestine and tested in vivo.en
dc.typeArticleen
dc.contributor.departmentDepartment of Epithelial Cell Biology, Paterson Institute for Cancer Research, Christie Hospital (NHS) Trust, Manchester, UK.en
dc.identifier.journalGrowth Factorsen
html.description.abstractFollowing a dose of 8 Gy of gamma-rays delivered to the entire body of BDF1 mice, the proliferative activity in the crypts of the small intestine changes. The labelling and mitotic activity both fall precipitously, but in the lower regions of the crypt recovery from this fall begins soon after irradiation with cyclic fluctuations. Forty-five to fifty hours after irradiation, control levels are reached after which there is an overshoot. The number of clonogenic cells in the crypt shows a somewhat similar pattern of regeneration and overshoot. It has been assumed that these changes reflect the production of endogenous signals for proliferation and inhibition and these might be extracted by diffusion through the gut wall. We report here that at appropriate times after irradiation stimulatory and inhibitory extracts could be prepared. Appropriate in vivo assay techniques have been developed for testing inhibitors or stimulators making similar use of the patterns of proliferative regeneration after irradiation. Extracts prepared at either 15 h or 39 h after irradiation, i.e. during the phase of active regeneration are quite potently stimulatory on recipient animals 96 h after irradiation (i.e., following the decline from a proliferative overshoot) when injected twice 3 h apart. Extract prepared 72 h after irradiation (shortly after the overshoot peak) is strongly inhibitory when tested on unirradiated animals, or animals 90 h after irradiation, when injected four times 2 h apart. An accompanying paper shows that the stimulatory extract is powerfully active on intestinal cell lines. The in vitro approach is currently being used to characterise the stimulatory factor.


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