Effects of low-dose heavy ions on embryonic development in mice and on melanocyte differentiation in the epidermis and hair bulb
| Autor: | Kimihiko Sugaya, Tomohisa Hirobe, Kiyomi Eguchi-Kasai, Masahiro Murakami |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Pathology
medicine.medical_specialty Cell type melanocyte Health Toxicology and Mutagenesis Cellular differentiation anomaly Embryonic Development Melanocyte Biology Radiation Dosage Mice Melanocyte differentiation Melanoblast epidermis medicine Animals Radiology Nuclear Medicine and imaging Heavy Ions Cells Cultured Radiation hair bulb Embryogenesis Embryo Cell Differentiation Dose-Response Relationship Radiation heavy ion melanoblast Cell biology Mice Inbred C57BL medicine.anatomical_structure Epidermal Cells Melanocytes Epidermis |
| Zdroj: | Journal of Radiation Research |
| ISSN: | 1349-9157 0449-3060 |
| Popis: | The effects of prenatal low-dose irradiation with heavy ions on embryonic development in mice and on melanocyte differentiation are not well understood. We performed whole-body irradiation of pregnant C57BL/10J mice at embryonic day 9 (E9) with a single dose of gamma-rays, silicon, argon or iron ions. The number of living embryos and embryonic body weight at E18 decreased after exposure to heavy ions at high doses. Malformations such as small eyes and limb anomalies were observed in heavy-ion-treated embryos, but not in gamma-ray-treated embryos. The frequency of abnormally curved tails was increased by exposure to gamma-rays and argon and iron ions even at a dose of 0.1 Gy (P < 0.05). In contrast, a dose-dependent decrease in the number of epidermal melanoblasts/melanocytes and hair bulb melanocytes was observed after 0.1 Gy irradiation with gamma-rays or heavy ions (P < 0.01). The decrease in the number of dorsal hair bulb melanocytes, dorsal and ventral epidermal melanoblasts/melanocytes and ventral hair bulb melanocytes was not necessarily correlated with the linear energy transfer (LET) of the radiation tested. Moreover, the effects of heavy ions were larger on the ventral skin than on the dorsal skin, indicating that the sensitivity of melanocytes to heavy ions differs between the dorsal and ventral skin. Taken together, these results suggest that the effects of the low-dose heavy ions differ between cell types and tissues, and the effects on the prenatal development of mice and melanocyte development are not necessarily greater than those of gamma-rays. |
| Databáze: | OpenAIRE |
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