Efeitos teratogênicos da hipervitaminose A em ratos / Teratogenic effects of hipervitaminosis A on rats

São avaliados neste trabalho os efeitos da vitamina A em várias doses sobre fetos de Ratus novergicus aIbinus. Foram administradas 30.000, 60.000 e 90.000 UI por via intraperitoneal no décimo dia de gestação e comparados com um grupo controle. Cada grupo composto por 5 animais foi sacrificado no vigésimo dia de gravidez. O exame macroscópio dos fetos revelou exoftalmia uni ou bilateral em todos. Nos grupos que receberam mais de 60.000 UI de vitamina A foi ainda observado macrostomia, micro e macroglossia, protusão da lingua, lingua bífida, espinha bífida, encurtamento dos membros anteriores, ossos maxilar e mandibular mais curtos. Na dose de 90.000 UI foi observada fenda palatina. A vitamina A em altas doses é teratogênica para Ratus novergicus albinus.

In this study the effects of the various doses of the vitamin A on Ratus novergicus albinus fetuses were evaluated. It were administred 30.000, 60.000 and 90.000 Ul by intraperitoneal via on the tenth day of gestation and compared with a control group. Each group composed by 5 animals was sacrificed on the twentieth day of pregnancy. The macroscopic examination of the fetuses revealed uni or bilateral exophthalmia in all of them. In the groups that received more than 60.000 UI of vitamin A, macrostomya, micro and macroglossya, tongue protusion, bifid tongue, bifid spine, shortening of the anterior members, maxilar and mandibular bones shorter were also observed. With the 90.000 UI dose it was seen cleft palate. The vitamin A in high doses is teratogenic to the Ratus novergicus albinus.

Modificaciones del contenido de fosforo hepatico y renal en cobayos tratados con dosis elevadas de vitamina A alcohol (retinol) / Alterations in the liver and kidney phosphorus in guinea pigs exposed to high doses of vitamin A (retinol)

In this study, the serum, urinary, hepatic and renal levels of total inorganic phosphorus (Pi) were determined in guinea pigs treated with 100,000 U.I. of vitamin A, dissolved in Tween Span, given each day by intramuscular injections during seven days (treated group), and compared with the levels in healthy guinea pigs which were given the same feed as the treated group, and received the same amount of Tween Span (control group). The activity of the enzymes alkaline phosphatase and acid phosphatase was simultaneously determined in liver and kidneys of both groups, and the phospholipid content in serum and tissue was also determined. The treated group did not show changes in serum and urinary phosphorus as compared with the control group. Liver and kidney of the treated group showed an increase in total Pi (p <0.05). In this group a definite increase (p < 0.05) was also observed both in serum and tissue levels of phospholipids, as well as in the activity of the liver and kidney enzymes studied. These results suggest that phosphorus enters the blood stream in the form of lipid complexes (phospholipids) that are involved in certain characteristic functions