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- W2005460045 abstract "Abstract The essential role of the Delta‐like ligand 4 (Dll4)‐Notch signaling pathway in T‐lymphocyte development is well established. It has been shown that specific inactivation of Dll4 on thymic stromal cells during early post‐natal development leads to a deregulation in T‐cell differentiation. However, whether ongoing Dll4‐Notch signaling is required for T‐cell development in the adult thymus is unknown. The use of anti‐Dll4 Abs allowed us to confirm and expand previous studies by examining the kinetics and the reversibility of Dll4‐Notch signaling blockade in T‐cell development in adult mice. We found that anti‐Dll4 treatment reduced thymic cellularity after 7 days, as a consequence of a developmental delay in T‐cell maturation at the pro‐T‐cell double negative 1 (CD4 − CD8 − c‐kit + CD44 + CD25 − ) stage, leading to decreased numbers of immature double‐positive (CD4 + CD8 + ) T cells without affecting the frequency of mature single positive CD4 + and CD8 + thymocytes, while promoting alternative thymic B‐cell expansion. This cellular phenotype was similarly observed in both young adult and aged mice (>1.5 years), extending our understanding of the ongoing role for Dll4‐Notch signaling during T‐cell development in the adult thymus. Finally, after cessation of Dll4 Ab treatment, thymic cellularity and thymocyte subset ratios returned to normal levels, indicating reversibility of this phenotype in both adult and aged mice, which has important implications for potential clinical use of Dll4‐Notch inhibitors." @default.
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- W2005460045 date "2011-07-04" @default.
- W2005460045 modified "2023-10-18" @default.
- W2005460045 title "Ongoing Dll4-Notch signaling is required for T-cell homeostasis in the adult thymus" @default.
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- W2005460045 doi "https://doi.org/10.1002/eji.201041343" @default.
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