Expression of calcium-binding protein regucalcin mRNA in the kidney cortex of rats: the stimulation by calcium administration.
The expression of calcium-binding protein regucalcin mRNA in the kidney cortex of rats was investigated. The change of regucalcin mRNA levels was analyzed by Northern blotting using liver regucalcin complementary DNA (0.9 kb of open-reading frame). Regucalcin mRNA was expressed in the kidney cortex, and this expression was clearly increased by a single intraperitoneal administration of calcium chloride solution (5-15 mg Ca/100 g body weight) in rats; this increase was remarkable at 60-120 min after the administration. Thyroparathyroidectomy (TPTX) caused a slight decrease of regucalcin mRNA levels in the kidney cortex. However, the administration of calcium (10 mg/100 g) in TPTX rats produced a clear increase of regucalcin mRNA levels in the kidney cortex. The subcutaneous administration of calcitonin (10-100 MRC mU/100 g) or parathyroid hormone [1-34] (1-10 U/100 g) in TPTX rats which received calcium (10 mg/100 g) administration did not cause an appreciable alteration of regucalcin mRNA levels in the kidney cortex, suggesting that the mRNA expression is not stimulated by calcium-regulating hormones. The administration of trifluoperazine (TFP; 5 mg/100 g), an inhibitor of Ca2+/calmodulin action, completely blocked the expression of regucalcin mRNA stimulated by calcium administration. Now, calcium content in the kidney cortex was significantly elevated by a single intraperitneal administration of calcium (10 mg/100 g) in rats. The present study clearly demonstrates that the expression of regucalcin mRNA in the kidney cortex is stimulated by calcium administration in rats. This expression may be mediated through Ca2+/calmodulin action in the kidney cortex.
Yamaguchi
M
M
Laboratory of Metabolism and Endocrinology, Graduate School of Nutritional Sciences, University of Shizuoka, Japan.
Kurota
H
H
D000311:Adrenal Glands / Q000378:metabolism; D000818:Animals; D002116:Calcitonin / Q000494:pharmacology; D002118:Calcium / Q000008:administration & dosage / Q000494:pharmacology*; D002135:Calcium-Binding Proteins / Q000235:genetics*; D002265:Carboxylic Ester Hydrolases; D005786:Gene Expression Regulation / Q000235:genetics; D047908:Intracellular Signaling Peptides and Proteins; D007672:Kidney Cortex / Q000378:metabolism*; D007679:Kidney Medulla / Q000378:metabolism*; D008099:Liver / Q000378:metabolism; D008297:Male; D010179:Pancreas / Q000378:metabolism; D010281:Parathyroid Hormone / Q000494:pharmacology; D016105:Parathyroidectomy; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D015238:Sulfotransferases; D013965:Thyroidectomy; D014268:Trifluoperazine / Q000494:pharmacology
D002135:Calcium-Binding Proteins; D047908:Intracellular Signaling Peptides and Proteins; D010281:Parathyroid Hormone; D012333:RNA, Messenger; D014268:Trifluoperazine; D002116:Calcitonin; D015238:Sulfotransferases; C028152:alcohol sulfotransferase; D002265:Carboxylic Ester Hydrolases; C513325:Rgn protein, rat; D002118:Calcium