Fanca Deficiency is Associated with Alterations in Osteoclastogenesis That Are Rescued by TNFα

Overview

Journal Cell Biosci

Publisher Biomed Central

Specialty Biology

Date 2023 Jun 24

PMID 37355617

Authors

Alessia Oppezzo

Lovely Monney

Henri Kilian

Lofti Slimani

Frederique Maczkowiak-Chartois

Filippo Rosselli

Affiliations

Soon will be listed here.

Abstract

Background: Hematopoietic stem cells (HSCs) reside in the bone marrow (BM) niche, which includes bone-forming and bone-resorbing cells, i.e., osteoblasts (OBs) and osteoclasts (OCs). OBs originate from mesenchymal progenitors, while OCs are derived from HSCs. Self-renewal, proliferation and differentiation of HSCs are under the control of regulatory signals generated by OBs and OCs within the BM niche. Consequently, OBs and OCs control both bone physiology and hematopoiesis. Since the human developmental and bone marrow failure genetic syndrome fanconi anemia (FA) presents with skeletal abnormalities, osteoporosis and HSC impairment, we wanted to test the hypothesis that the main pathological abnormalities of FA could be related to a defect in OC physiology and/or in bone homeostasis.

Results: We revealed here that the intrinsic differentiation of OCs from a Fanca mouse is impaired in vitro due to overactivation of the p53-p21 axis and defects in NF-kB signaling. The OC differentiation abnormalities observed in vitro were rescued by treating Fanca cells with the p53 inhibitor pifithrin-α, by treatment with the proinflammatory cytokine TNFα or by coculturing them with Fanca-proficient or Fanca-deficient osteoblastic cells.

Conclusions: Overall, our results highlight an unappreciated role of Fanca in OC differentiation that is potentially circumvented in vivo by the presence of OBs and TNFα in the BM niche.

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