Abstract:
:We earlier showed that outside-in integrin signaling through POSTN-ITGAV interaction plays an important role in regulating adult hematopoietic stem cell (HSC) quiescence. Here, we show that Itgav deletion results in increased frequency of phenotypic HSCs in fetal liver (FL) due to faster proliferation. Systemic deletion of Postn led to increased proliferation of FL HSCs, albeit without any loss of stemness, unlike Vav-Itgav-/- HSCs. Based on RNA sequencing analysis of FL and bone marrow HSCs, we predicted the involvement of DNA damage response pathways in this dichotomy. Indeed, proliferative HSCs from Postn-deficient FL tissues showed increased levels of DNA repair, resulting in lesser double-strand breaks. Thus POSTN, with its expression majorly localized in the vascular endothelium of FL tissue, acts as a regulator of stem cell pool size during development. Overall, we demonstrate that the duality of response to proliferation in HSCs is developmental stage dependent and can be correlated with DNA damage responses.
journal_name
Stem Cell Reportsjournal_title
Stem cell reportsauthors
Biswas A,Roy IM,Babu PC,Manesia J,Schouteden S,Vijayakurup V,Anto RJ,Huelsken J,Lacy-Hulbert A,Verfaillie CM,Khurana Sdoi
10.1016/j.stemcr.2020.06.022subject
Has Abstractpub_date
2020-08-11 00:00:00pages
340-357issue
2issn
2213-6711pii
S2213-6711(20)30243-5journal_volume
15pub_type
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