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Perturbed hematopoiesis in mice lacking ATMIN

Anjos-Afonso, Fernando, Loizou, Joanna I., Bradburn, Amy, Kanu, Nnennaya, Purewal, Sukhveer, Da Costa, Clive, Bonnet, Dominique and Behrens, Axel 2016. Perturbed hematopoiesis in mice lacking ATMIN. Blood 128 (16) , pp. 2017-2021. 10.1182/blood-2015-09-672980

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The ATM-interacting protein ATMIN mediates non-canonical ATM signaling in response to oxidative and replicative stress conditions. Like ATM, ATMIN can function as a tumor suppressor in the hematopoietic system: deletion of Atmin under the control of CD19-Cre results in B cell lymphomas in aging mice. ATM signaling is essential for lymphopoiesis and hematopoietic stem cell (HSC) function; however, little is known about the role of ATMIN in hematopoiesis. We thus sought to investigate if the absence of ATMIN would affect primitive hematopoietic cells in an ATM-dependent or -independent manner. Apart from its role in B cell development, we show that ATMIN has an ATM-independent function in the common myeloid progenitors (CMPs) by deletion of Atmin in the entire hematopoietic system using Vav-Cre. Despite the lack of lymphoma formation, ATMIN-deficient mice developed chronic leukopenia as a result of high levels of apoptosis in B cells and CMPs and induced a compensatory mechanism in which HSCs displayed enhanced cycling. Consequently, ATMIN-deficient HSCs showed impaired regeneration ability, with the induction of the DNA oxidative stress response, especially when aged. ATMIN therefore has multiple roles in different cell types and its absence results in perturbed hematopoiesis, especially during stress conditions and aging.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Subjects: Q Science > Q Science (General)
Publisher: American Society of Hematology
ISSN: 0006-4971
Date of First Compliant Deposit: 12 October 2016
Date of Acceptance: 25 August 2016
Last Modified: 28 Nov 2020 21:22

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