Abnormal retinal pigment epithelium melanogenesis as a major determinant for radiation-induced congenital eye defects

Publication date: Available online 6 November 2019Source: Reproductive ToxicologyAuthor(s): Kai Craenen, Mieke Verslegers, Livine Craeghs, Roel Quintens, Ann Janssen, Amelie Coolkens, Sarah Baatout, Lieve Moons, Mohammed Abderrafi BenotmaneAbstractRecent studies highlighted a link between ionizing radiation exposure during neurulation and birth defects such as microphthalmos and anophthalmos. Because the mechanisms underlying these defects remain largely unexplored, we irradiated pregnant C57BL/6J mice (1.0 Gy, X-rays) at embryonic day (E)7.5, followed by histological and gene/protein expression analyses at defined days. Irradiation impaired embryonic development at E9 and we observed a delayed pigmentation of the retinal pigment epithelium (RPE) at E11. In addition, a reduced RNA expression and protein abundance of critical eye-development genes (e.g. Pax6 and Lhx2) was observed. Furthermore, a decreased expression of Mitf, Tyr and Tyrp1 supported the radiation-induced perturbation in RPE pigmentation. Finally, via immunostainings for proliferation (Ki67) and mitosis (phosphorylated histone 3), a decreased mitotic index was observed in the E18 retina after exposure at E7.5. Overall, we propose a plausible etiological model for radiation-induced eye-size defects, with RPE melanogenesis as the major determining factor.
Source: Reproductive Toxicology - Category: Toxicology Source Type: research

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