Migration of Erythroblastic Islands toward the Sinusoid as Erythroid Maturation Proceeds in Rat Bone Marrow

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  • YOKOYAMA Toshifumi
    Department of Life Science, Graduate School of Science and Technology, Kobe University
  • ETOH Takao
    Department of Animal Science, Graduate School of Science and Technology, Kobe University
  • KITAGAWA Hiroshi
    Department of Life Science, Graduate School of Science and Technology, Kobe University
  • TSUKAHARA Shinji
    Department of Life Science, Graduate School of Science and Technology, Kobe University
  • KANNAN Yasuyuki
    Department of Life Science, Graduate School of Science and Technology, Kobe University

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It has been hitherto considered that mature erythroblasts migrate toward the sinusoid along the cytoplasmic processes of macrophages of erythroblastic islands in bone marrow. Our previous report, however, has demonstrated the morphological features of a mature erythroblastic island passing through the sinusoidal endothelium. In this study, the possibility of migration of erythroblastic islands toward the sinusoid was examined in rat bone marrow by light microscopical histoplanimetry. As a result, the more mature erythroblasts were not regularly arranged in the peripheral direction of the erythroblastic islands. Immature erythroblasts were populated more in the erythroblastic islands away from the sinusoid than in those islands neighboring the sinusoid, whereas mature erythroblasts were more in erythroblastic islands neighboring the sinusoid. These findings suggest that the formation of erythroblastic islands occurs in a region away from the sinusoid, and that erythroblastic islands migrate towards the sinusoids as erythroid maturation proceeds.<br>

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