Combined effects of low-level methylmercury and x-radiation on the developing mouse cerebellum

Journal Article · Wed May 01 04:00:00 EDT 1991 · Journal of Toxicology and Environmental Health; (USA)

DOI:https://doi.org/10.1080/15287399109531504· OSTI ID:5638968

Inouye, M; Kajiwara, Y; Hirayama, K ^[1]

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1. Nagoya Univ. (Japan)

The effects of low-level methylmercury and x-radiation in combination on the developing mouse cerebellum were studied. Pregnant BALB/cJcl mice were divided into two groups. Dams of a group were orally given 9 micrograms Hg/g body weight of methylmercuric chloride on d 17 of pregnancy. The other dams were not treated. They were allowed to give birth, and the male pups were exposed to a single x-radiation at doses of 0.125 or 0.5 Gy on the day following birth. Sham-exposed pups were also prepared. The pups were killed at various postexposure periods, and their cerebella were removed and processed for microscopy and mercury analysis. Mercury was retained in the pup cerebellum at levels of 4-8 micrograms/g for 4 d and then lowered. Appearance and incidence of cell death in the external granular layer (EGL) were similar in groups exposed to 0.125 Gy alone or 0.125 Gy and methylmercury in combination. Fourteen percent of cells in the EGL were killed by exposure to 0.5 Gy with or without methylmercury. Restoration of the EGL from the damage was slightly retarded by methylmercury, but by 10 d of age these cerebella overtook the normal ones in development. These findings indicate that methylmercury does not modify the apoptotic cell death caused by x-radiation in the EGL but retards the tissue restoration from the damage.

• OSTI ID: 5638968
• Journal Information: Journal of Toxicology and Environmental Health; (USA), Journal Name: Journal of Toxicology and Environmental Health; (USA) Vol. 33:1; ISSN JTEHD; ISSN 0098-4108
• Country of Publication: United States
• Language: English

Related Subjects

560152 -- Radiation Effects on Animals-- Animals
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
CEREBELLUM
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
MAMMALS
MERCURY COMPOUNDS
METHYLMERCURY
MICE
NERVOUS SYSTEM
ONTOGENESIS
ORGANIC COMPOUNDS
ORGANIC MERCURY COMPOUNDS
ORGANS
PREGNANCY
RADIATION EFFECTS
RADIATIONS
RODENTS
SENSITIVITY
SYNERGISM
TOXICITY
VERTEBRATES
X RADIATION