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  • Title: Interleukin 5 and B cell differentiation.
    Author: Takatsu K.
    Journal: Cytokine Growth Factor Rev; 1998 Mar; 9(1):25-35. PubMed ID: 9720754.
    Abstract:
    Interleukin-5 (IL-5) stimulates proliferation and differentiation of B cells and eosinophils. IL-5 receptor (IL-5R) comprises alpha and (beta)c chains. IL-5 specifically binds to IL-5Ralpha and induces the recruitment of (beta)c to IL-5Ralpha. JAK2 and JAK1 tyrosine kinases are constitutively associated with hIL-5Ralpha and (beta)c, respectively and activated upon IL-5 stimulation. IL-5 induces tyrosine phosphorylations of cellular proteins including (beta)c and STAT5 and activates Btk. X-linked immunodeficient mice have B-cell-specific defects due to missense mutation of the btk gene. The cytoplasmic proline-rich regions of both IL-5Ralpha and (beta)c are essential for the IL-5 signalling. IL-5 appears to play a critical role in hypereosinophilic syndromes and atopic diseases. The treatment of animals with anti-IL-5 mAb can decrease the enhanced bronchial responsiveness induced by allergen sensitization. Clinical studies provide a strong impetus for investigating the means of modulating IL-5 effects.
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