Neonatal exposure to a moderate dose of ionizing radiation causes behavioural defects and altered levels of tau protein in mice
2014 (English)In: Neurotoxicology, ISSN 0161-813X, E-ISSN 1872-9711, Vol. 45, 48-55 p.Article in journal (Refereed) Published
Medical use of ionizing radiation (IR) has great benefits for treatment and diagnostic imaging, butprocedures as computerized tomography (CT) may deliver a significant radiation dose to the patient.Recently, awareness has been raised about possible non-cancer consequences from low dose exposure toIR during critical phases of perinatal and/or neonatal brain development.In the present study neonatal NMRI mice were whole body irradiated with a single dose of gammaradiation (0; 350 and 500 mGy) on postnatal day 10 (PND 10). At 2 and 4 months of age, mice of bothsexes were observed for spontaneous behaviour in a novel home environment. The neuroproteinsCaMKII, GAP-43, synaptophysin and total tau in male mouse cerebral cortex and hippocampus wereanalysed 24 h post-irradiation and in adults at 6 months of age exposed to 0 or 500 mGy on PND 10.A significantly dose-response related deranged spontaneous behaviour in 2- and 4-month-old micewas observed, where both males and females displayed a modified habituation, indicating reducedcognitive function. The dose of 350 mGy seems to be a tentative threshold. Six-month-old male miceshowed a significantly increased level of total tau in cerebral cortex after irradiation to 500 mGy compared to controls. This demonstrates that a single moderate dose of IR, given during a defined criticalperiod of brain development, is sufficient to cause persistently reduced cognitive function. Moreover, anelevation of tau protein was observed in male mice displaying reduced cognitive function.
Place, publisher, year, edition, pages
2014. Vol. 45, 48-55 p.
Other Natural Sciences
IdentifiersURN: urn:nbn:se:uu:diva-240576DOI: 10.1016/j.neuro.2014.09.002ISI: 000346955100006PubMedID: 25265567OAI: oai:DiVA.org:uu-240576DiVA: diva2:776723
FunderEU, FP7, Seventh Framework Programme, 29552Swedish Radiation Safety Authority