RESUMO
OBJECTIVE:To study the distribution law of Valsartan capsules in the ocular tissue of rabbit eyes after intragastri-cal administration. METHODS:3 rabbits(6 eyes)were intragastrically administrated Valsartan solution,7.5 mg every time,twice a day,for 6 d. Rabbits were executed after last administration,and the cornea,iris,aqueous humor,lens,vitreous and retina tis-sues were collected. HPLC was used to determine the content of valsartan in each tissue. RESULTS:Content of valsartan in retina, iris,cornea,aqueous humor,vitreous and lens were (4.274 ± 1.75),(2.233 ± 0.72),(0.871 ± 0.66),(0.713 ± 0.49),(0.177 ± 0.07),(0.083 ± 0.06)μg/g,respectively. CONCLUSIONS:After multiple administrations,valsartan distributes unevenly in each tissue of eyes,showing highest distribution content in retina,followed by iris,and lowest content in lens and vitreous.
RESUMO
Present study has shown that differentiated cell types may loose their definitive characteristics and acquire features of another specialized cell type. Young (3 toe stage) and mature (5 toe stage) tadpoles of the frog, Euphylictis cyanophlyctis were employed as experimental animals. Experiments were completed in two phases: in the first part of experiment, lenses were extracted from right eye balls of tadpoles and treated with vitamin A; in the second part of the experiment, meshed lentectomized eye ball tissues were implanted into the pit made on mid lateral position of the tail of young and mature tadpoles and were treated with vitamin A. The results obtained gave clear evidence of plasticity and reprogramming of terminally differentiated ocular tissue into lens, retina and even complete eye. Vitamin A was found to be good model for accelerating the reprogramming of differentiated ocular tissue in anuran frog tadpoles.