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Not just for lymphoid cells: The role of the noncanonical NF-κB signaling pathway in early and late myelopoiesis with a focus on hypereosinophilic disorders.
Journal of Leukocyte Biology 2024 April 30
The noncanonical NF-κB pathway is involved in lymphoid organ development, B cell maturation, and cytokine production. However, new research has demonstrated that this pathway is also key for the orderly and sequential maturation of myeloid cells, including neutrophils and eosinophils. When this pathway is disrupted or constitutively activated, aberrations in hematopoietic stem and progenitor cell (HSPC) survival and proliferation, as well as subsequent granulopoiesis and eosinophilopoiesis are affected. Disturbance of such a coordinated and delicate process can manifest in devastating clinical disease including acute and chronic myeloid leukemias (AML and CML, respectively), pre-leukemic processes such as myelodysplastic syndrome (MDS) or hyperinflammatory conditions like Hypereosinophilic Syndrome (HES). In this review, we will discuss the molecular machinery within the noncanonical NF-κB pathway, crosstalk with the canonical NF-κB pathway, murine models of noncanonical signaling, as well as how aberrations in this pathway manifest in leukemic or hyperinflammatory disease with a focus on HES. Potential and promising drug therapies will also be discussed, emphasizing the noncanonical NF-κB pathway as a potential target for improved treatment for patients suffering from leukemia or idiopathic HES. The hope is that review of such mechanisms and treatments may eventually result in findings that aid physicians in rapidly diagnosing and more accurately classifying patients suffering from such complex and overlapping hematopoietic diseases.
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