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• W2005802087 abstract "In a companion article, we report that there is a sensitive period for all-trans retinoic acid (RA) lethality on gestational days (GD) 11-13. When dams were given 10 mg/kg RA daily for 3 consecutive days on GD 11-13, a number of pups were found dead in the home cage on the day of birth, and the remainder inevitably died due to an apparent inability to nurse. Here we report a set of experiments further investigating these effects. Dams were exposed PO to 10 mg/kg RA or oil vehicle on GD 11-13. Fetuses were removed by Cesarean section on the afternoon of GD 21, culled, and fostered to non-treated dams that had given normal vaginal delivery a day earlier. Maternal behavior was observed for the first 6 h after fostering. The next morning all surviving pups were given a brief behavioral evaluation, including the ability to attach to the nipple of anesthetized foster dams. At the time of C-section, culls were killed and brains were quickly removed and placed in fixative. A series of paraffin-embedded, cresyl-violet-stained serial sections of a representative brain stem from each litter was prepared. RA exposure did not increase fetal mortality. Treated litters were as large as controls, and virtually all treated fetuses were alive in utero. However, unlike controls, some treated fetuses appeared to have difficulty in initiating spontaneous breathing when delivered by C-section, and considerable physical stimulation was required before normal breathing began. As in the previous report, RA-exposed pups did not have milk in their stomachs after 18 h on the foster dam; further, they did not attach to the maternal nipple, and they had greater difficulty than controls in maintaining an upright posture. Examination of serial sections of the medulla indicated that the hypoglossal nucleus appeared grossly normal in the RA-exposed pups. In contrast, the inferior olive and the area postrema were affected by RA exposure. Both nuclei were normally located, but exhibited reduced cell density and/or intensity of staining. In the inferior olive the dorsal and principal nuclei were primarily affected, to the degree that about one quarter of treated brains had no identifiable principal nucleus. We conclude that RA exposure on GD 11-13 causes abnormal development of cell-dense regions of the medial medulla, and these abnormalities may account for the difficulty these animals experience in beginning spontaneous breathing and in nursing. These breathing and nursing problems in turn almost certainly account for the high mortality seen during natural birth and for the subsequent failure to thrive, respectively." @default.
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• W2005802087 title "A behavioral and neuroanatomical investigation of the lethality caused by gestational day 11–13 retinoic acid exposure" @default.
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• W2005802087 doi "https://doi.org/10.1016/s0892-0362(97)00040-8" @default.
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