The present paper analyses the results of competitive blood-cell repopulation experiments in which Cx43-WT (connexin 43 wild-type) host mice, whose own HSCs (haemopoietic stem cells) were deleted, were grafted with fetal liver cells: 50% Gpi-1a (glucose phosphate isomerase-1a)/Cx43-WT cells competing with 50% Gpi-1b/Cx43-WT, 50% Gpi-1b/Cx43-HZ (heterozygous) or 50% Gpi-1b/Cx43-KO (knock-out) cells. The percentages of platelets, granulocytes, red cells, B-cells and T-cells containing Gpi-1b in blood samples obtained from 22 to 186 days after grafting, and the percentages of high-proliferation-potential colony-forming cells containing Gpi-1b at 255 days after grafting, were measured. The results show that, if we wait 4 months so that we measure the percentages of Gpi-1b end-cells formed by initially resting stem cells in the graft, values in HZ mice are greater than those in WT and KO mice by 10% or more. We propose a bipolar influence model for blood formation by grafted HSCs to explain this difference and other features of the data. Influence A is a direct one: for individual HSCs, the combined effect on HSC niching and HSC proliferation of Cx43 is superior to that of the KO allele. Influence B is a demographic one: HZ foundation mice compensate by having more HSCs than WT mice. The net outcome of influences A and B is that HZ is the winner.
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November 2003
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Research Article|
November 01 2003
Enhancement of repopulation haemopoiesis by heterozygous connexin 43 stem cells seeded on wild-type connexin 43 stroma
Martin ROSENDAAL;
Martin ROSENDAAL
*Department of Anatomy & Developmental Biology, UCL, Gower St, London WC1 E6BT, U.K.
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Mervyn STONE
†Department of Statistical Science, UCL, Gower St, London WC1 E6BT, U.K.
Correspondence: Professor M. Stone, 25 Hawtrey Drive, Ruislip, Middx. HA4 8QW, U.K. (e-mail mervyn@stats.ucl.ac.uk).
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Publisher: Portland Press Ltd
Received:
April 24 2003
Revision Received:
June 10 2003
Accepted:
July 01 2003
Accepted Manuscript online:
July 01 2003
Online ISSN: 1470-8736
Print ISSN: 0143-5221
© 2003 The Biochemical Society
2003
Clin Sci (Lond) (2003) 105 (5): 561–568.
Article history
Received:
April 24 2003
Revision Received:
June 10 2003
Accepted:
July 01 2003
Accepted Manuscript online:
July 01 2003
Citation
Martin ROSENDAAL, Mervyn STONE; Enhancement of repopulation haemopoiesis by heterozygous connexin 43 stem cells seeded on wild-type connexin 43 stroma. Clin Sci (Lond) 1 November 2003; 105 (5): 561–568. doi: https://doi.org/10.1042/CS20030151
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