title: Dietary Deficiency of Calcium and/or Iron, an Age-Related Risk Factor for Renal Accumulation of Cadmium in Mice.
abstract: The major route of cadmium (Cd) intake by non-smokers is through food ingestion. Cd is a non-essential metal absorbed through one or more transporters of essential metal ions. Expression of these transporters is affected by nutritional status. To investigate the risk factors for Cd toxicity, the effects of deficiency of essential metals on hepatic and renal accumulation of Cd were studied in mice of different ages. Mice were administered a control diet or one of the essential metal-deficient diets, administered Cd by gavage for 6 weeks, and killed; then, Cd accumulation was evaluated. Iron deficiency (FeDF) or calcium deficiency (CaDF) resulted in remarkable increases in hepatic and renal Cd accumulation compared with control-diet mice and other essential metal-deficient mice. Cd accumulation in hepatic and renal tissue was increased significantly at all ages tested in FeDF and CaDF mice. Renal Cd concentrations were higher in 4-week-old mice than in 8- and 25-week-old mice. Increase in intestinal mRNA expression of calcium transporter (CaT)1, divalent metal ion transporter-1, and metallothionein (MT)1 was also higher in 4-week-old mice than in other mice. Renal accumulation of Cd showed strong correlation with intestinal mRNA expression of CaT1 and MT1. These data suggest that CaDF and FeDF at younger ages can be a risk factor for Cd toxicity.
authors.affiliation: Faculty of Pharmacy, Osaka Ohtani University.
authors.forename: Kyong-Son
authors.initials: KS
authors.lastname: Min
authors.forename: Erika
authors.initials: E
authors.lastname: Sano
authors.forename: Hidenori
authors.initials: H
authors.lastname: Ueda
authors.forename: Fumitoshi
authors.initials: F
authors.lastname: Sakazaki
authors.forename: Keita
authors.initials: K
authors.lastname: Yamada
authors.forename: Masaoki
authors.initials: M
authors.lastname: Takano
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tanaka
mesh_terms: D000284:Administration, Oral; D000375:Aging / Q000502:physiology*; D000818:Animals; D002104:Cadmium / Q000493:pharmacokinetics*; D002118:Calcium / Q000378:metabolism; D015220:Calcium Channels / Q000235:genetics; D002136:Calcium, Dietary; D027682:Cation Transport Proteins / Q000235:genetics; D007421:Intestine, Small / Q000378:metabolism; D007501:Iron / Q000378:metabolism; D019266:Iron, Dietary; D007668:Kidney / Q000378:metabolism*; D008099:Liver / Q000378:metabolism; D008297:Male; D008668:Metallothionein / Q000235:genetics; D051379:Mice; D012333:RNA, Messenger / Q000378:metabolism; D012307:Risk Factors; D050916:TRPV Cation Channels / Q000235:genetics; D000099236:Solute Carrier Family 11, Member 2
chemical_list: D002104:Cadmium; D002118:Calcium; D015220:Calcium Channels; D002136:Calcium, Dietary; D027682:Cation Transport Proteins; D007501:Iron; D019266:Iron, Dietary; D008668:Metallothionein; D012333:RNA, Messenger; D050916:TRPV Cation Channels; D000099236:Solute Carrier Family 11, Member 2; C446923:Trpv6 protein, mouse