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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Radiochromium distribution during saline diuresis.

Free water diuresis in vasopressin-deficient Brattleboro rats does not influence body conservation of chromium (Cr+3), suggesting a proximal tubular site for renal Cr reabsorption. Other data suggest that Cr conservation is accomplished primarily by lack of glomerular filtration or by tissue binding to a specific Cr-binding substance. To provide further data, radiochromium (51Cr) retention and tissue distribution were studied in SHR and WKY rats undergoing saline diuresis. Despite high urine flows, body retention and urinary excretion of 51Cr were unchanged. Tissue content of 51Cr was minimally and not consistently influenced by saline diuresis in either rat strain. Compared to WKY rats, the SHR rats had a trend to lower serum and tissue 51Cr content but higher tissue/serum 51Cr ratios. These data fail to incriminate collecting duct reabsorption in Cr conservation but are compatible with proximal Cr reabsorption or either of the two hypotheses mentioned above. The decreased serum 51Cr content of SHR rats may be due to the mechanical effect of increased plasma and extracellular volumes. One possible explanation for the increased tissue/serum 51Cr ratios may be the presence of a factor in SHR rats promoting cellular Cr transport. However, there is no present evidence to suggest that any of the hormones believed capable of increasing Cr transport (insulin, growth hormone, thyroxine, ADH) are increased in the SHR rat.[1]


  1. Radiochromium distribution during saline diuresis. Wallach, S., Verch, R.L. Journal of the American College of Nutrition. (1986) [Pubmed]
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