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Hematopoietic stem-cell behavior in nonhuman primates.

Abstract：

:Little is known about the behavior of hematopoietic stem cells (HSCs) in primates because direct observations and competitive-repopulation assays are not feasible. Therefore, we used 2 different and independent experimental strategies, the tracking of transgene expression after retroviral-mediated gene transfer (N = 11 baboons; N = 7 rhesus macaques) and quantitation of the average telomere length of granulocytes (N = 132 baboons; N = 14 macaques), together with stochastic methods, to study HSC kinetics in vivo. The average replication rate for baboon HSCs is once per 36 weeks according to gene-marking analyses and once per 23 weeks according to telomere-shortening analyses. Comparable results were derived from the macaque data. These rates are substantially slower than the average replication rates previously reported for HSCs in mice (once per 2.5 weeks) and cats (once per 8.3 weeks). Because baboons and macaques live for 25 to 45 years, much longer than mice ( approximately 2 years) and cats (12-18 years), we can compute that HSCs undergo a relatively constant number ( approximately 80-200) of lifetime replications. Thus, our data suggest that the self-renewal capacity of mammalian stem cells in vivo is defined and evolutionarily conserved.

journal_name

Blood

journal_title

Blood

authors

Shepherd BE,Kiem HP,Lansdorp PM,Dunbar CE,Aubert G,LaRochelle A,Seggewiss R,Guttorp P,Abkowitz JL

doi

10.1182/blood-2007-02-075382

subject

Has Abstract

pub_date

2007-09-15 00:00:00

pages

1806-13

issue

6

eissn

0006-4971

issn

1528-0020

pii

blood-2007-02-075382

journal_volume

110

pub_type

杂志文章

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