Intestinal crypt properties fit a model that incorporates replicative ageing and deep and proximate stem cells.

Abstract:

:A model of intestinal crypt organization is suggested based on the assumption that stem cells have a finite replicative life span. The model assumes the existence in a crypt of a quiescent ('deep') stem cell and a few more actively cycling ('proximate') stem cells. Monte Carlo computer simulation of published intestinal crypt mutagenesis data is used to test the model. The results of the simulation indicate that stabilization of the crypt mutant phenotype following treatment with external mutagen is consistent with a stem cell replicative life span of about 40 divisions for mouse colon and 90-100 divisions for mouse small intestine, corresponding to a deep stem cell cycle time of about 3.9 and 8.5 weeks for colon and small intestine, respectively. Simulation of the data obtained for human colorectal crypts suggests that the proximate stem cell cycle time is about 80 h, assuming a replicative life span of 50-150 divisions, and that the deep stem cell divides approximately every 30 weeks.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Lobachevsky PN,Radford IR

doi

10.1111/j.1365-2184.2006.00395.x

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

379-402

issue

5

eissn

0960-7722

issn

1365-2184

pii

CPR395

journal_volume

39

pub_type

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