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Learn MoreIn this report, we show that VEGF-blockade in neonates induces rapid changes in all three stromal compartments of the thymus, and that these changes recapitulate the maturation of these cell types seen during the transition from the neonatal to the young adult thymus. These changes in the microenvironment occur prior to the loss of thymocytes, and include not only a loss of cTECs relative to mTECs but also depletion of CD146+CD140aneg cells, a novel population of pericytes we have identified in the neonatal thymus. Importantly, we show that based on receptor expression and receptor blockade, VEGF drives the fetal/neonatal phenotype of the thymus through distinct VEGFR2- and NRP1-dependent pathways in thymic endothelial and mesenchymal cells respectively. In addition, receptor signaling induces changes in critical pathways affecting the function of all three compartments, with consequences on thymopoieisis. SOURCE: Gay,Miriam,Crooks (gcrooks@mednet.ucla.edu) - University of California Los Angeles
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