Interleukin-6 (IL-6) and low O(2) concentration (1%) synergize to improve the maintenance of hematopoietic stem cells (pre-CFC).

Abstract:

:Low O(2) concentration (1%) favors the self-renewal of hematopoietic stem cells and inhibits committed progenitors (CFC). Since IL-6 influences both stem cells and committed progenitors at 20% O(2), we studied its effects in cultures at 1% O(2). The pre-CFC activity in Lin- population of mouse bone marrow was analyzed following 10 days of serum-free culture in medium (LC1) supplemented with IL-3 with and without IL-6, at 20 and 1% O(2) and phenotypic differentiation and proliferative history monitored. The IL-6 receptor expression and initiation of VEGF-A synthesis were also investigated. At 20% O(2), the effects of IL-6 on pre-CFC were negligible but effects on CFC were apparent; conversely, at 1% O(2), the IL-6 enhances activity of pre-CFC but not of CFC. Unlike at 20% O(2), at 1% O(2) a subpopulation of cells remained Lin- in spite of extensive proliferation. However, the absolute number of Lin- cells, did not correlate with pre-CFC activity. A relative increase in VEGF transcripts at 1% O(2) in presence of IL-3 alone was enhanced by the addition of IL-6. IL-6 enhanced pre-CFC activity at 1% O(2) and this was correlated to the induction of VEGF. These data reinforce the concept that physiologically low oxygenation of bone marrow is a regulator of stem cell maintenance. Since the 20% O(2) does not exist in tissues in vivo, further studies in vitro at lower O(2) concentrations should revise our knowledge relating to cytokine effects on stem and progenitor cells.

journal_name

J Cell Physiol

authors

Kovacević-Filipović M,Petakov M,Hermitte F,Debeissat C,Krstić A,Jovcić G,Bugarski D,Lafarge X,Milenković P,Praloran V,Ivanović Z

doi

10.1002/jcp.21003

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

68-75

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

212

pub_type

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