Neonatal exposure of newborn mice to pyrethroid (permethrin) represses activity-dependent c-fos mRNA expression in cerebellum.
In a previous report, we demonstrated that the exposure of cultured mouse cerebellar granule cells to permethrin, a type I pyrethroid insecticide, repressed the induction of activity-dependent c- fos and brain-derived neurotrophic factor (BDNF) gene expression, accompanying a decrease in Ca(2+) influx into neurons. In addition, it has been suggested that some pyrethroids, including permethrin, are endocrine-modulating chemicals and accumulate in human breast milk. In this study, therefore, we investigated whether lactational exposure of newborn mice to permethrin influenced c- fos, BDNF and beta-actin gene expression in the developing neonatal cerebellum. In the cerebella of control neonates, c- fos mRNA expression was characterized by a significant increase in postnatal weeks 2 and 3, followed by a marked decrease. In the cerebella of permethrin-treated neonates, the expression of c- fos mRNA was dose-dependently repressed by cis-permethrin more effectively than by trans-permethrin at postnatal week 3, without alterations in the body or cerebellum weights of neonates. In the fourth and fifth week, however, c- fos mRNA expression had decreased to the same level as that in the control and permethrin-treated neonates. A decrease in BDNF mRNA expression tended to be observed in the cerebella of newborn mice on exposure to permethrin. Thus, our results indicate that the activity-dependent gene expressions in cerebellar neuronal cells can be repressed by permethrin both in vitro and in vivo, and suggest that lactational exposure to pyrethroids might affect the postnatal development of the mammalian brain.
Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Shibuya 3-13-11, Tokyo 150-0002, Japan.
Lisa
L
Imamura
Hiroshi
H
Hasegawa
Kaori
K
Kurashina
Tomoya
T
Matsuno
Masaaki
M
Tsuda
D000818:Animals; D000831:Animals, Newborn; D015152:Blotting, Northern; D019208:Brain-Derived Neurotrophic Factor / Q000096:biosynthesis / Q000235:genetics; D002531:Cerebellum / Q000187:drug effects* / Q000378:metabolism; D011723:Chrysanthemum cinerariifolium; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D007306:Insecticides / Q000633:toxicity*; D007774:Lactation / Q000378:metabolism; D008297:Male; D020714:Maximum Tolerated Dose; D051379:Mice; D008813:Mice, Inbred ICR; D026023:Permethrin / Q000633:toxicity*; D016760:Proto-Oncogene Proteins c-fos / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis*
D019208:Brain-Derived Neurotrophic Factor; D007306:Insecticides; D016760:Proto-Oncogene Proteins c-fos; D012333:RNA, Messenger; D026023:Permethrin