T cell progenitors emerge earlier than B cell progenitors in the murine fetal liver |
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Authors: | Kawamoto H Ikawa T Ohmura K Fujimoto S Katsura Y |
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Institution: | Department of Immunology, Institute for Frontier Medical Sciences, Kyoto University, Japan. |
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Abstract: | The developmental potential of individual cells in the Lin-c-kit+CD45+IL-7R+ (IL-7R+) population from murine fetal liver was investigated using a clonal assay capable of determining the potential of a progenitor to give rise to myeloid, T, and B cells. Unipotent progenitors generating T cells (p-T) or B cells (p-B) but not other types of progenitors were found in the IL-7R+ population. A large proportion of progenitors at day 12 of gestation are p-T, whereas the frequency of p-T dramatically decreases with gestational age. In marked contrast, p-B are very rare by day 12, but they rapidly increase thereafter. These findings strongly suggest that the commitment of multipotent progenitors to T and B cell lineages occurs independently. |
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