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In Fanconi anemia, impaired accumulation of bone marrow neutrophils during emergency granulopoiesis induces hematopoietic stem cell stress.
Hu, Liping; Huang, Weiqi; Liu, Bin; Eklund, Elizabeth A.
Afiliación
  • Hu L; Division of Hematology-Oncology, Department of Medicine, Northwestern University, Chicago, Illinois, USA.
  • Huang W; Division of Hematology-Oncology, Department of Medicine, Northwestern University, Chicago, Illinois, USA; Division of Hematology-Oncology, Department of Medicine, Jesse Brown VA Medical Center, Chicago, Illinois, USA.
  • Liu B; Division of Hematology-Oncology, Department of Medicine, Northwestern University, Chicago, Illinois, USA; Division of Hematology-Oncology, Department of Medicine, Jesse Brown VA Medical Center, Chicago, Illinois, USA.
  • Eklund EA; Division of Hematology-Oncology, Department of Medicine, Northwestern University, Chicago, Illinois, USA; Division of Hematology-Oncology, Department of Medicine, Jesse Brown VA Medical Center, Chicago, Illinois, USA. Electronic address: e-eklund@northwestern.edu.
J Biol Chem ; 300(8): 107548, 2024 Aug.
Article en En | MEDLINE | ID: mdl-38992437
ABSTRACT
Fanconi anemia (FA) is an inherited disorder of DNA repair due to mutation in one of 20+ interrelated genes that repair intrastrand DNA crosslinks and rescue collapsed or stalled replication forks. The most common hematologic abnormality in FA is anemia, but progression to bone marrow failure (BMF), clonal hematopoiesis, or acute myeloid leukemia may also occur. In prior studies, we found that Fanconi DNA repair is required for successful emergency granulopoiesis; the process for rapid neutrophil production during the innate immune response. Specifically, Fancc-/- mice did not develop neutrophilia in response to emergency granulopoiesis stimuli, but instead exhibited apoptosis of bone marrow hematopoietic stem cells and differentiating neutrophils. Repeated emergency granulopoiesis challenges induced BMF in most Fancc-/- mice, with acute myeloid leukemia in survivors. In contrast, we found equivalent neutrophilia during emergency granulopoiesis in Fancc-/-Tp53+/- mice and WT mice, without BMF. Since termination of emergency granulopoiesis is triggered by accumulation of bone marrow neutrophils, we hypothesize neutrophilia protects Fancc-/-Tp53+/- bone marrow from the stress of a sustained inflammation that is experienced by Fancc-/- mice. In the current work, we found that blocking neutrophil accumulation during emergency granulopoiesis led to BMF in Fancc-/-Tp53+/- mice, consistent with this hypothesis. Blocking neutrophilia during emergency granulopoiesis in Fancc-/-Tp53+/- mice (but not WT) impaired cell cycle checkpoint activity, also found in Fancc-/- mice. Mechanisms for loss of cell cycle checkpoints during infectious disease challenges may define molecular markers of FA progression, or suggest therapeutic targets for bone marrow protection in this disorder.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Células Madre Hematopoyéticas / Ratones Noqueados / Proteína del Grupo de Complementación C de la Anemia de Fanconi / Anemia de Fanconi / Neutrófilos Límite: Animals Idioma: En Revista: J Biol Chem Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Células Madre Hematopoyéticas / Ratones Noqueados / Proteína del Grupo de Complementación C de la Anemia de Fanconi / Anemia de Fanconi / Neutrófilos Límite: Animals Idioma: En Revista: J Biol Chem Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos