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- W1892355704 abstract "In TGF-beta1-knockout mice, TGF-beta1-null conceptuses die during embryonic development with a penetrance of lethality that depends on the mouse genetic background. Studies have suggested that transplacental passage of maternal TGF-beta1 could account for the rescue of some TGF-beta1-null embryos. Herein, we have used an adenovirus-based gene delivery system and a strain of mice where most TGF-beta1-null conceptuses die prior to parturition, to investigate whether an increase in maternal TGF-beta1 during pregnancy would rescue TGF-beta1-null embryos. A single intravenous injection of an adenovirus containing a modified version of TGF-beta1 cDNA (Ad-TGF-beta1S223/S225), coding for a biologically active form of the cytokine, induced a 20-fold increase in plasma TGF-beta1 (active and latent forms) levels for up to 3 months in adult mice. Similar levels of TGF-beta1 were detected in 13-day post coïtum (dpc) embryos from Ad-TGF-beta1-treated mothers, demonstrating an efficient maternal/fetal transfer of the cytokine. However, no increase in the frequencies of TGF-beta1-null neonates nor in day 11.5 dpc TGF-beta1-null conceptuses was observed despite elevated levels of TGF-beta1 delivered throughout gestation. In addition, we show that the high levels of TGF-beta1-titrated in the plasma from Ad-TGF-beta1S223/S225-treated mice were partly the consequence of a stimulation of an autocrine production by exogenous bioactive TGF-beta1. These results indicate that transplacental passage of TGF-beta1 was not effective in rescuing TGF-beta1-null conceptuses from embryonic lethality." @default.
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- W1892355704 date "2002-01-10" @default.
- W1892355704 modified "2023-09-23" @default.
- W1892355704 title "Adenoviral supply of active transforming growth factor-beta1 (TGF-beta1) did not prevent lethality in transforming growth factor-beta1-knockout embryos." @default.
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