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Stem Cells. 2015 Dec;33(12):3608-20. doi: 10.1002/stem.2195. Epub 2015 Oct 8.

Hypoxia Differentially Modulates the Genomic Stability of Clinical-Grade ADSCs and BM-MSCs in Long-Term Culture.

Bigot N1,2,3, Mouche A1,2,3, Preti M4,5,6, Loisel S1,2,3, Renoud ML4,5,6, Le Guével R2,7, Sensebé L4,5,6, Tarte K1,2,3,8, Pedeux R1,2,3.

Author information

1
INSERM U917, Microenvironnement et Cancer, Rennes, France.
2
Université de Rennes 1, Rennes, France.
3
Etablissement Français du Sang Bretagne, Rennes, France.
4
Etablissement Français du Sang Pyrénées Méditerranée, Toulouse, France.
5
Université Paul Sabatier, Toulouse, France.
6
UMR5273-INSERM U1031, Toulouse, France.
7
ImPACcell, SFR Biosit, Université de Rennes 1, Rennes, France.
8
Service ITeCH, CHU Pontchaillou, Rennes, France.

Abstract

Long-term cultures under hypoxic conditions have been demonstrated to maintain the phenotype of mesenchymal stromal/stem cells (MSCs) and to prevent the emergence of senescence. According to several studies, hypoxia has frequently been reported to drive genomic instability in cancer cells and in MSCs by hindering the DNA damage response and DNA repair. Thus, we evaluated the occurrence of DNA damage and repair events during the ex vivo expansion of clinical-grade adipose-derived stromal cells (ADSCs) and bone marrow (BM)-derived MSCs cultured with platelet lysate under 21% (normoxia) or 1% (hypoxia) O2 conditions. Hypoxia did not impair cell survival after DNA damage, regardless of MSC origin. However, ADSCs, unlike BM-MSCs, displayed altered γH2AX signaling and increased ubiquitylated γH2AX levels under hypoxic conditions, indicating an impaired resolution of DNA damage-induced foci. Moreover, hypoxia specifically promoted BM-MSC DNA integrity, with increased Ku80, TP53BP1, BRCA1, and RAD51 expression levels and more efficient nonhomologous end joining and homologous recombination repair. We further observed that hypoxia favored mtDNA stability and maintenance of differentiation potential after genotoxic stress. We conclude that long-term cultures under 1% O2 were more suitable for BM-MSCs as suggested by improved genomic stability compared with ADSCs.

KEYWORDS:

Adipose-derived stromal cell; Bone marrow-mesenchymal stromal/stem cell; DNA repair; Hypoxia; Long-term culture

PMID:
26422646
DOI:
10.1002/stem.2195
[Indexed for MEDLINE]
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