Basophil proliferation and differentiation

Basophil proliferation and differentiation, also known as basophilopoiesis, is the physiological process by which hematopoietic stem cells in the bone marrow commit to the basophil lineage and mature into functional effector cells. This process is primarily regulated by the cytokine Interleukin-3 (IL-3) acting through its high-affinity receptor, CD123, which activates downstream signaling pathways such as JAK2/STAT5 to promote survival and maturation (Valent et al., 2004). Pathological acceleration of this process is a diagnostic hallmark of certain myeloproliferative neoplasms, most notably Chronic Myeloid Leukemia (CML), where basophilia often signals disease progression or blast crisis (Swerdlow et al., 2016). Because this term describes a complex biological phenomenon rather than a single molecular entity, it is not classified as a discrete therapeutic target; however, the molecules that drive it are major focal points for drug development. For example, Tagraxofusp is a CD123-directed cytotoxin used to deplete cells in this lineage, while tyrosine kinase inhibitors like Imatinib are used to suppress the abnormal basophil expansion driven by the BCR-ABL fusion protein in leukemia (Druker et al., 2006). Monitoring basophil counts and surface markers like CD123 or CD203c provides critical insights into therapeutic efficacy and disease state in both malignant and severe allergic conditions (Stone et al., 2010).

Other names

BasophilopoiesisBasophil developmentBasophil differentiationBasophil production

Inhibition of signaling pathways (e.g., IL-3 receptor/CD123 or BCR-ABL tyrosine kinase) that drive the expansion and maturation of basophil progenitors.