Abstract:
:We analyzed the effect of exposure to hypoxic/hypercapnic (HH) gas mixture (5% O2 /9% CO2 ) on the maintenance of functional cord blood CD34(+) hematopoietic stem and progenitor cells in severe hypothermia (4°C) employing the physiological and proteomic approaches. Ten-day exposure to HH maintained the Day 0 (D-0) level of hematopoietic stem cells as detected in vivo on the basis of hematopoietic repopulation of immunodeficient mice-short-term scid repopulating cells (SRC). Conversely, in the atmospheric air (20% O2 /0.05% CO2 ), usual condition used for cell storage at 4°C, stem cell activity was significantly decreased. Also, HH doubled the survival of CD34(+) cells and committed progenitors (CFCs) with respect to the atmospheric air (60% vs. 30%, respectively). Improved cell maintenance in HH was associated with higher proportion of aldehyde dehydrogenase (ALDH) positive cells. Cell-protective effects are associated with an improved maintenance of the plasma and mitochondrial membrane potential and with a conversion to the glycolytic energetic state. We also showed that HH decreased apoptosis, despite a sustained ROS production and a drop of ATP amount per viable cell. The proteomic study revealed that the global protein content was better preserved in HH. This analysis identified: (i) proteins sensitive or insensitive to hypothermia irrespective of the gas phase, and (ii) proteins related to the HH cell-protective effect. Among them are some protein families known to be implicated in the prolonged survival of hibernating animals in hypothermia. These findings suggest a way to optimize short-term cell conservation without freezing.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Vlaski M,Negroni L,Kovacevic-Filipovic M,Guibert C,Brunet de la Grange P,Rossignol R,Chevaleyre J,Duchez P,Lafarge X,Praloran V,Schmitter JM,Ivanovic Zdoi
10.1002/jcp.24678subject
Has Abstractpub_date
2014-12-01 00:00:00pages
2153-65issue
12eissn
0021-9541issn
1097-4652journal_volume
229pub_type
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