Increases in the Expression Levels of Aquaporin-2 and Aquaporin-3 in the Renal Collecting Tubules Alleviate Dehydration Associated with Polyuria in Diabetes Mellitus
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概要
- 論文の詳細を見る
Enhanced expression of renal aquaporin-2 (AQP2) has been reported when polyuria occurs in diabetic animal models. The purpose of this study was to clarify the possibility that increased AQP2 expression in the kidneys play a role as a compensatory mechanism to alleviate diabetic dehydration. Lithium carbonate (Li2CO3), which decreases the renal expression of AQPs, was administered to streptozotocin (STZ)-induced model mice of type I diabetes mellitus (STZ mice), to investigate the relationship between urine volume and renal AQP expression. Plasma glucose and urine glucose levels were similar between STZ mice given feed containing Li2CO3 for 10 d and un-treated STZ mice. Urine volume increased to 70 ml/d for the Li2CO3-treated STZ mice, compared to 36 ml/d for un-treated STZ mice. No changes were observed in creatinine clearance or the mRNA expression levels of sodium myo-inositol transporter and taurine transporter, which are genes associated with the regulation of osmotic pressure in the kidney, in the Li2CO3-treated STZ mice relative to un-treated STZ mice. Protein expression levels of AQP2 and aquaporin-3 (AQP3) of the renal inner medulla were significantly decreased in the Li2CO3-treated STZ mice, compared to levels in the STZ group. This study revealed that the decreased expression levels of AQP2 and AQP3 in the kidney increased the urine volume in mice without a change in urinary osmotic pressure. The results of this study suggest that the increased renal AQP2 and AQP3 expression, in the setting of polyuria, physiologically serves as a compensatory mechanism to alleviate dehydration in diabetes mellitus.
著者
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Ikarashi Nobutomo
Department of Clinical Pharmacokinetics, School of Pharmacy and Pharmaceutical Sciences, Hoshi Unive
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Toda Takahiro
Department of Clinical Pharmacokinetics, School of Pharmacy and Pharmaceutical Sciences, Hoshi Unive
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Ochiai Wataru
Department Of Anatomy And Cell Biology Nagoya University Graduate School Of Medicine
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Sugiyama Kiyoshi
Department Of Clinical Pharmacokinetics Hoshi University
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Kobayashi Yasushi
Department Of Anatomy National Defense Medical College
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Satake Masako
Department of Clinical Pharmacokinetics, Hoshi University
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Kagami Mai
Department of Clinical Pharmacokinetics, Hoshi University
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Ogiue Naoki
Department of Clinical Pharmacokinetics, Hoshi University
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Sugiyama Kiyoshi
Department of Clinical Pharmacokinetics, Hoshi University
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Ikarashi Nobutomo
Department of Clinical Pharmacokinetics, Hoshi University
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Ochiai Wataru
Department of Clinical Pharmacokinetics, Hoshi University
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TODA Takahiro
Department of Clinical Pharmacokinetics, Hoshi University
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