title: Thyroid hormone status of newborns in relation to in utero exposure to PCBs and hydroxylated PCB metabolites.
abstract: The associations between in utero exposure to polychlorinated biphenyls (PCBs) or hydroxylated PCB metabolites (OH-PCBs), and free thyroxin (fT4) or thyroid-stimulating hormone (TSH) status in the newborn were investigated as a pilot study of a large-scale epidemiologic study on in utero PCB or OH-PCB exposure and thyroid function of the newborns. Umbilical cord tissue was used as the media for the biological monitoring of PCBs/OH-PCBs exposure in utero. For the measurement of fT4 and TSH, a heel-prick blood sample spotted on filter paper, which is called Guthrie card, is collected from each neonate at day 4-6 postpartum for this study when the mass screening sampling was performed. We showed that the concentration of total OH-PCBs and one of the OH-PCB congeners (OH-PCB 187) was related significantly to higher fT4 level of newborns. On the other hand, the concentration of total PCBs and PCB congeners (PCB 118, 138, 153, and 180) showed no relationship with fT4 and TSH level of the newborns. The results obtained in this pilot study indicated the possibility that in utero OH-PCBs exposure affects thyroid hormone status of newborns.
authors.affiliation: Department of Environmental Studies, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan.
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Otake
authors.forename: Jun
authors.initials: J
authors.lastname: Yoshinaga
authors.forename: Takeshi
authors.initials: T
authors.lastname: Enomoto
authors.forename: Muneaki
authors.initials: M
authors.lastname: Matsuda
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Wakimoto
authors.forename: Miyuki
authors.initials: M
authors.lastname: Ikegami
authors.forename: Emiko
authors.initials: E
authors.lastname: Suzuki
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Naruse
authors.forename: Tomoya
authors.initials: T
authors.lastname: Yamanaka
authors.forename: Noriko
authors.initials: N
authors.lastname: Shibuya
authors.forename: Takehiko
authors.initials: T
authors.lastname: Yasumizu
authors.forename: Nobumasa
authors.initials: N
authors.lastname: Kato
mesh_terms: D004785:Environmental Pollutants / Q000032:analysis / Q000097:blood*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007564:Japan; D008431:Maternal-Fetal Exchange; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000097:blood*; D011247:Pregnancy; D013972:Thyrotropin / Q000097:blood; D013974:Thyroxine / Q000097:blood*; D014470:Umbilical Cord / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D013972:Thyrotropin; D011078:Polychlorinated Biphenyls; D013974:Thyroxine