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- W4313557918 abstract "To investigate the influence of the dose in the FITC-Dextran 4kDa (FD-4) permeability test in an obese mouse model, we tested the bodyweight dose regimen and a lean body mass-based dose regimen in high fat diet (HFD) mice and low fat diet (LFD) mice. We hypothesized that the FD-4 permeation result would be dose-dependent.The two dose regimens were compared in HFD and LFD mice. Furthermore, we conducted a dose-response study to test the effect of a low or high dose of FD-4 in weight-stratified lean mice. Gene analysis of tight junctions was also carried out.The FD-4 intestinal permeability test was dose-dependent as we found a significant increase in plasma levels of FD-4 in obese mice with the bodyweight dose regimen. However, this difference was not detectable with the lean body mass dose regimen, even with variability-adjusted group sizes. However, the qPCR analysis revealed a decrease in tight junction gene expression in obese mice. Furthermore, we found a dose-dependent significant increase in FD-4 measured in plasma samples in lean mice. No significant difference in intestinal weight was observed between lean and obese mice.Evaluation of the intestinal permeability by FD-4 with the typical bodyweight dose regimen in obese mice will be confounded by the significant difference in dose given when compared to a lean control group. If the test dose is based on lean body mass, no significant difference in intestinal permeability is observed, even with large group sizes. Furthermore, we showed a dose-dependent difference in plasma FD-4 levels in lean mice. Therefore, we conclude that the dose should be based on lean body mass for the FD-4 permeability test if mice with considerable obesity differences are to be compared or to use another test with fixed doses." @default.
- W4313557918 created "2023-01-06" @default.
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- W4313557918 date "2023-01-05" @default.
- W4313557918 modified "2023-09-30" @default.
- W4313557918 title "The intestinal permeability marker FITC-dextran 4kDa should be dosed according to lean body mass in obese mice" @default.
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- W4313557918 doi "https://doi.org/10.1038/s41387-022-00230-2" @default.
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