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Evidence for recombinant GRP78, CALR, PDIA3 and GPI as mediators of genetic instability in human CD34+ cells

Soluble factors released from irradiated human mesenchymal stromal cells (MSC) may induce genetic instability in human CD34+ cells, potentially mediating hematologic disorders. Recently, we identified four key proteins in the secretome of X-ray-irradiated MSC, among them three endoplasmic reticulum...

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Main Authors: Fabarius, Alice (Author) , Samra, Vanessa (Author) , Drews, Oliver (Author) , Mörz, Handan (Author) , Bierbaum, Miriam (Author) , Darwich, Ali (Author) , Weiß, Christel (Author) , Brendel, Susanne (Author) , Kleiner, Helga (Author) , Seifarth, Wolfgang (Author) , Greffrath, Wolfgang (Author) , Hofmann, Wolf-Karsten (Author) , Schmitt, Clemens Alexander (Author) , Popp, Henning (Author)
Format: Article (Journal)
Language:English
Published: 11 June 2022
In: Cancers
Year: 2022, Volume: 14, Issue: 12, Pages: 1-11
ISSN:2072-6694
DOI:10.3390/cancers14122883
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.3390/cancers14122883
Verlag, kostenfrei, Volltext: https://www.mdpi.com/2072-6694/14/12/2883
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Author Notes:Alice Fabarius, Vanessa Samra, Oliver Drews, Handan Mörz, Miriam Bierbaum, Ali Darwich, Christel Weiss, Susanne Brendel, Helga Kleiner, Wolfgang Seifarth, Wolfgang Greffrath, Wolf-Karsten Hofmann, Clemens A. Schmitt and Henning D. Popp
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Summary:Soluble factors released from irradiated human mesenchymal stromal cells (MSC) may induce genetic instability in human CD34+ cells, potentially mediating hematologic disorders. Recently, we identified four key proteins in the secretome of X-ray-irradiated MSC, among them three endoplasmic reticulum proteins, the 78 kDa glucose-related protein (GRP78), calreticulin (CALR), and protein disulfide-isomerase A3 (PDIA3), as well as the glycolytic enzyme glucose-6-phosphate isomerase (GPI). Here, we demonstrate that exposition of CD34+ cells to recombinant GRP78, CALR, PDIA3 and GPI induces substantial genetic instability. Increased numbers of γH2AX foci (p < 0.0001), centrosome anomalies (p = 0.1000) and aberrant metaphases (p = 0.0022) were detected in CD34+ cells upon incubation with these factors. Specifically, γH2AX foci were found to be induced 4-5-fold in response to any individual of the four factors, and centrosome anomalies by 3-4 fold compared to control medium, which contained none of the recombinant proteins. Aberrant metaphases, not seen in the context of control medium, were detected to a similar extent than centrosome anomalies across the four factors. Notably, the strongest effects were observed when all four factors were collectively provided. In summary, our data suggest that specific components of the secretome from irradiated MSC act as mediators of genetic instability in CD34+ cells, thereby possibly contributing to the pathogenesis of radiation-induced hematologic disorders beyond direct radiation-evoked DNA strand breaks.
Item Description:Dieser Artikel gehört zum Special issue: Biophotonics and imaging for cancer screening, diagnosis and treatment monitoring
Gesehen am 15.01.2024
Physical Description:Online Resource
ISSN:2072-6694
DOI:10.3390/cancers14122883

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