Small intestinal growth regulatory factors extracted by simple diffusion from intact irradiated intestine and tested in vivo.

2.50
Hdl Handle:
http://hdl.handle.net/10541/96105
Title:
Small intestinal growth regulatory factors extracted by simple diffusion from intact irradiated intestine and tested in vivo.
Authors:
Potten, Christopher S; Chadwick, Caroline A
Abstract:
Following 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.
Affiliation:
Department of Epithelial Cell Biology, Paterson Institute for Cancer Research, Christie Hospital (NHS) Trust, Manchester, UK.
Citation:
Small intestinal growth regulatory factors extracted by simple diffusion from intact irradiated intestine and tested in vivo. 1994, 10 (1):63-75 Growth Factors
Journal:
Growth Factors
Issue Date:
1994
URI:
http://hdl.handle.net/10541/96105
DOI:
10.3109/08977199409019604
PubMed ID:
8179932
Type:
Article
Language:
en
ISSN:
0897-7194
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
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.en
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
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