Abstract
Infusion of cells into the fetus is a new form of intrauterine therapy for several genetic disorders. The effect of in utero infusion routes on labelled lymphocyte distribution in fetal rat organs was investigated. Fetuses, 14–16 days of gestation, were infused in utero with a Hoechst 33342 (bis-benzamide) labelled lymphocyte and FITC-labelled polystyrene bead mixture via four routes: intraperitoneal, intraplacental, intra-amniotic, and intravenous. The distribution within tissues was evaluated in frozen sections of placenta and fetal organs. Our results suggest that among the four routes tested, the intravenous route offered the possibility to reach easily fetal organs without any cell loss and yielded higher cell and bead concentrations in fetal organs, especially in the liver and in the kidney. In conclusion, the intravenous route seems to be appropriate for hematopoietic cell transplantation in the developing fetus.
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