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. 1982 Feb;79(3):840–844. doi: 10.1073/pnas.79.3.840

Partitioning of bone marrow into stem cell regulatory domains.

M A Maloney, R A Lamela, M J Banda, H M Patt
PMCID: PMC345848  PMID: 6950430

Abstract

To examine the hypothesis that bone marrow consists of discrete stem cell regulatory volumes or domains, we studied spleen colony-forming unit (CFU-S) population growth kinetics in unirradiated WBB6F1-W/Wv mice receiving various doses of +/+ bone marrow cells. Assay of femoral marrow CFU-S content in the eight recipient dose groups revealed a family of growth curves having an initial dose-independent exponential phase and a subsequent dose-dependent deceleration phase. CFU-S content at the growth transition (inflection point) was not a simple linear function of inoculum dose but was shown rather to reflect a random distribution of initially seeded donor CFU-S in discrete volumes of recipient bone marrow. The inoculum dose resulting in a mean of 1 CFU-S per bone marrow sampling unit was estimated to be 17 x 10(6) bone marrow cells, corresponding to a total marrow uptake of approximately 5100 CFU-S (based on a seeding efficiency factor of 10%). If we assume single-hit kinetics, it follows that the recipient W/Wv bone marrow may contain approximately 5100 domains in which stem cell proliferation is geared to the density of the stem cell population. When the various inocula were corrected for multiple seeding in a given domain, the mean inflection point per domain was similar and indicative of five or so divisions before departure from exponential growth at approximately 20% of final CFU-S content 8 days after bone marrow injection. The partitioning of bone marrow into highly localized functional units is consistent with the putative regulatory role of short-range interactions between stem cells and essential stromal elements.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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