بررسي مقايسه اي اثر رتينوئيك اسيد اگزوژن بر اندام حركتي جلويي و عقبي جنين موش نژاد Balb/c در شرايط in vitro و مقايسه ميزان جذب آن

Effects of exogenous retinoic acid on forelimb and hind limb bud culture of rat in vitro

Background: Retinoic acid (RA), one of the vitamin A derivatives, is used for the treatment of acne, psoriasis and some forms of cancer. It plays an important role in the growth and differentiation during development of vertebrates. In this research the effects of exogenous retinoic acid was investigated on forelimb and hind limb bud culture in vitro. Material and methods: In this experiment, female mice mated with males and observation of vaginal plug was considered as day 0 of gestation. The embryos were removed from uterus at day 12, their limb bud were excised and cultured in Eagleʹs minimum essential media with 20% human embryo cord scrum for two days. Experimental limb bud received RA in three concentrations of 10 10 "ʹand 10"1 M. Sham limb bud, received only alcohol (the solvent) and control did not receivc anything. Samples were fixed in the Bouinʹs solution and stained with Alcian bine for morphological features. Histological studies were morphologically examined. Results: The toxic effects of RA exogenous on the development of limb buds were observed. This toxic effect was greater on fore limb bud. Conclusion: Our results showed that exogenous RA affects the growth and development of limb buds through reducing both the length of proximal-distal axis and the growth of digits in a dose-dependent manner. Microscopic stndies revealed that RA hinders chondrogenesis in a dose-dependent manner with higher concentrations significantly reducing the number of limb bud chondrocytes, KEYWORDS: Retinoic acid, Fore limb bud, Chondrogenesis.