Asrij/OCIAD1 suppresses CSN5-mediated p53 degradation and maintains mouse hematopoietic stem cell quiescence.

Abstract:

:Inactivation of the tumor suppressor p53 is essential for unrestrained growth of cancers. However, only 11% of hematological malignancies have mutant p53. Mechanisms that cause wild-type p53 dysfunction and promote leukemia are inadequately deciphered. The stem cell protein Asrij/OCIAD1 is misexpressed in several human hematological malignancies and implicated in the p53 pathway and DNA damage response. However, Asrij function in vertebrate hematopoiesis remains unknown. We generated the first asrij null (knockout [KO]) mice and show that they are viable and fertile with no gross abnormalities. However, by 6 months, they exhibit increased peripheral blood cell counts, splenomegaly, and an expansion of bone marrow hematopoietic stem cells (HSCs) with higher myeloid output. HSCs lacking Asrij are less quiescent and more proliferative with higher repopulation potential as observed from serial transplantation studies. However, stressing KO mice with sublethal γ irradiation or multiple injections of 5-fluorouracil results in reduced survival and rapid depletion of hematopoietic stem/progenitor cells (HSPCs) by driving them into proliferative exhaustion. Molecular and biochemical analyses revealed increased polyubiquitinated protein levels, Akt/STAT5 activation and COP9 signalosome subunit 5 (CSN5)-mediated p53 ubiquitination, and degradation in KO HSPCs. Further, we show that Asrij sequesters CSN5 via its conserved OCIA domain, thereby preventing p53 degradation. In agreement, Nutlin-3 treatment of KO mice restored p53 levels and reduced high HSPC frequencies. Thus, we provide a new mouse model resembling myeloproliferative disease and identify a posttranslational regulator of wild-type p53 essential for maintaining HSC quiescence that could be a potential target for pharmacological intervention.

journal_name

Blood

journal_title

Blood

authors

Sinha S,Dwivedi TR,Yengkhom R,Bheemsetty VA,Abe T,Kiyonari H,VijayRaghavan K,Inamdar MS

doi

10.1182/blood.2019000530

subject

Has Abstract

pub_date

2019-05-30 00:00:00

pages

2385-2400

issue

22

eissn

0006-4971

issn

1528-0020

pii

blood.2019000530

journal_volume

133

pub_type

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