Expression of metallothionein in the liver and kidney of rats is influenced by excess dietary histidine.
It is well known that excess dietary histidine induces the metabolic changes in copper and zinc. Therefore, this study was carried out to clarify whether excess dietary histidine alters the gene expressions of metallothionein-1 and metallothionein-2 in the liver and kidney. Male rats were fed the control (ad libitum and pair-fed) or histidine-excess (50 g of L-histidine per kg of diet) diet for 0, 1 and 3 days. The levels of liver metallothionein-1 and metallothionein-2 mRNA were markedly lower in the rats fed the histidine-excess diet as compared to those of the control (ad libitum and pair-fed) diet, when fed for 1 or 3 days. The levels of renal metallothionein-1 and metallothionein-2 mRNA in the rats fed the histidine-excess diet were higher or tended to be higher as compared with the rats fed the control (ad libitum and pair-fed) diet when fed for 1 or 3 days, respectively. At the same time, hepatic copper content was decreased and renal zinc content was increased by dietary histidine. It thus appears, that such a response on the level of liver metallothionein mRNA might be related to the contents of liver copper, but of kidney metallothionein mRNA might be due to the content of zinc.
Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Nishi-9, Kita-9, Kita-ku, 060-8589, Sapporo, Japan. aoyama@chem.agr.hokudai.ac.jp
Y
Y
Aoyama
C
C
Kato
S
S
Sakakibara
D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000378:metabolism; D015152:Blotting, Northern; D001835:Body Weight / Q000187:drug effects; D002570:Ceruloplasmin / Q000737:chemistry; D003300:Copper / Q000097:blood / Q000737:chemistry / Q000378:metabolism; D004032:Diet; D005786:Gene Expression Regulation; D006639:Histidine / Q000378:metabolism / Q000494:pharmacology*; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008668:Metallothionein / Q000235:genetics* / Q000378:metabolism*; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015430:Weight Gain / Q000187:drug effects; D015032:Zinc / Q000097:blood / Q000737:chemistry / Q000378:metabolism
D001425:Bacterial Outer Membrane Proteins; C075462:harpin protein, Erwinia amylovora; C087295:HrpZ protein, Pseudomonas syringae; D006639:Histidine; D003300:Copper; D008668:Metallothionein; D002570:Ceruloplasmin; D015032:Zinc