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• W1968272012 abstract "It was hypothesized that heterologous anti-rat visceral yolk sac serum (AVYS) exerts its teratogenic effect by reducing the endocytosis of serum proteins by the visceral yolk sac (VYS), thus reducing the supply of amino acids to the embryo and VYS. To evaluate this hypothesis, we studied the effect of teratogenic AVYS on the endocytic function of the VYS and the ultrastructure of the VYS and parietal yolk sac (PYS). Rat conceptuses were exposed to a teratogenic dose of AVYS on the 10th day of gestation in vivo or in vitro. Control and AVYS-exposed specimens were collected 24-192 hr later and prepared for scanning and transmission electron microscopy (SEM and TEM, respectively) utilizing standard procedures. The Endocytic Index was calculated for the VYS utilizing standard procedures. Approximately 97% of the in vivo exposed and 94% of the in vitro exposed embryos were morphologically abnormal. Ultrastructural observations showed that exposure to AVYS in vivo or in vitro caused severe damage to the VYS endodermal epithelial cells with loss of cellular borders, reduction in the number and length of microvilli, and increased cellular inclusions; and some damage to PYS endodermal cells with increased blebbling and decreased cell number. Recovery was evident at 72 hr and complete by 96 hr. The Endocytic Index was significantly reduced in the VYS 24 and 48 hr after injecting AVYS into the pregnant rat but was not significantly different at 96 and 192 hr. Our results show that the AVYS antiserum damaged visceral endodermal epithelium experienced ultrastructural recovery with parallel functional recovery. These studies suggest that transient yolk sac placental ultrastructural damage and dysfunction was probably sufficient to cause irreversible damage to the developing embryo during early organogenesis. We conclude that the proximate effect of the AVYS was on the plasma membrane of the visceral endoderm and that decreased pinocytosis is a consequence of this effect." @default.
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• W1968272012 date "1991-08-01" @default.
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• W1968272012 title "Ultrastructure and function of the rat yolk sac: Damage caused by teratogenic anti-VYS serum and recovery" @default.
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• W1968272012 doi "https://doi.org/10.1002/tera.1420440206" @default.
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