What question did this study set out to answer?

To determine whether acute suppression of circulating arginine vasopressin via oral water loading alters aquaporin-2 mRNA expression and subcellular localization in collecting duct cells of dehydrated rats.

February 1, 1997AJP Renal Physiology

Alteration in water channel AQP-2 by removal of AVP stimulation in collecting duct cells of dehydrated rats

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Authors

TSToshikazu SaitoMiwa Internal Medicine Clinic SISan‐e IshikawaJichi Medical University SSS. SasakiJichi Medical University

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Implication

Laboratory study demonstrates rapid downregulation and cytoplasmic internalization of aquaporin-2 upon rehydration in dehydrated rats, highlighting dynamic vasopressin-mediated shuttle recycling.

Key Points

To determine whether acute suppression of circulating arginine vasopressin via oral water loading alters aquaporin-2 mRNA expression and subcellular localization in collecting duct cells of dehydrated rats.
Water-deprived rats (72 hours) received an acute oral water load of 40 ml/kg to suppress circulating arginine vasopressin levels.
Measured plasma arginine vasopressin concentrations and collecting duct aquaporin-2 mRNA expression across time points, including 20 minutes post-load.
Evaluated subcellular distribution of aquaporin-2 in collecting duct cells at baseline and 1 hour post-water administration using immunohistochemistry and electron microscopy.
Dehydration for 72 hours increased plasma arginine vasopressin to 3.1 pg/ml and stimulated aquaporin-2 mRNA expression by 336%, effects that were abolished by the 40 ml/kg oral water load.
Oral water administration achieved a 50% inhibition of aquaporin-2 mRNA expression within 20 minutes.
Immunohistochemistry and electron microscopy showed aquaporin-2 concentrated along the apical membrane in dehydrated rats, which translocated diffusely into the cytoplasm 1 hour after water administration.

Cite This Study

Saito et al. (1997) studied this question.

synapsesocial.com/papers/6a9163967b795cf5f2c64e40 https://doi.org/10.1152/ajprenal.1997.272.2.f183

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Implication

Laboratory study demonstrates rapid downregulation and cytoplasmic internalization of aquaporin-2 upon rehydration in dehydrated rats, highlighting dynamic vasopressin-mediated shuttle recycling.

Alteration in water channel AQP-2 by removal of AVP stimulation in collecting duct cells of dehydrated rats

Discussion

Member takes

Implication

Key Points

Cite This Study

Alteration in water channel AQP-2 by removal of AVP stimulation in collecting duct cells of dehydrated rats

Discussion

Member takes

Implication

Key Points

Cite This Study

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