Abstract:
:Investigating mechanisms that regulate endothelial cell (EC) growth and survival is important for understanding EC homeostasis and how ECs maintain stem cell niches. We report here that targeted loss of Id genes in adult ECs results in dilated, leaky sinusoids and a pro-inflammatory state that increases in severity over time. Disruption in sinusoidal integrity leads to increased hematopoietic stem cell (HSC) proliferation, differentiation, migration, and exhaustion. Mechanistically, sinusoidal ECs (SECs) show increased apoptosis because of reduced Bcl2-family gene expression following Id gene ablation. Furthermore, Id1-/-Id3-/- SECs and upstream type H vessels show increased expression of cyclin-dependent kinase inhibitors p21 and p27 and impaired ability to proliferate, which is rescued by reducing E2-2 expression. Id1-/-Id3-/- mice do not survive sublethal irradiation because of impaired vessel regeneration and hematopoietic failure. Thus, Id genes are required for the survival and regeneration of BM SECs during homeostasis and stress to maintain HSC development.
journal_name
Cell Repjournal_title
Cell reportsauthors
Gadomski S,Singh SK,Singh S,Sarkar T,Klarmann KD,Berenschot M,Seaman S,Jakubison B,Gudmundsson KO,Lockett S,Keller JRdoi
10.1016/j.celrep.2020.107572subject
Has Abstractpub_date
2020-04-28 00:00:00pages
107572issue
4issn
2211-1247pii
S2211-1247(20)30521-0journal_volume
31pub_type
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