Abstract
Purpose
We previously showed the deleterious effects of increased dietary protein on renal manifestations and glucose metabolism in leptin receptor-deficient (db) mice. Here, we further examined its effects on glucose metabolism, including urinary C-peptide. We also orally administered mixtures corresponding to low- or high-protein diets to diabetic mice.
Methods
In diet experiments, under pair-feeding (equivalent energy and fat) conditions using a metabolic cage, mice were fed diets with different protein content (L diet: 12 % protein, 71 % carbohydrate, 17 % fat; H diet: 24 % protein, 59 % carbohydrate, 17 % fat) for 15 days. In oral administration experiments, the respective mixtures (L mixture: 12 % proline, 71 % maltose or starch, 17 % linoleic acid; H mixture: 24 % proline, 59 % maltose or starch, 17 % linoleic acid) were supplied to mice. Biochemical parameters related to glucose metabolism were measured.
Results
The db–H diet mice showed significantly higher water intake, urinary volume, and glucose levels than db–L diet mice but similar levels of excreted urinary C-peptide. In contrast, control-H diet mice showed significantly higher C-peptide excretion than control-L diet mice. Both types of mice fed H diet excreted high levels of urinary albumin. When maltose mixtures were administered, db–L mixture mice showed significantly higher blood glucose after 30 min than db–H mixture mice. However, db mice administered starch–H mixture showed significantly higher blood glucose 120–300 min post-administration than db–L mixture mice, although both groups exhibited similar insulin levels.
Conclusions
High-protein, low-carbohydrate diets deteriorated diabetic conditions and were associated with insufficient insulin secretion in db mice. Our findings may have implications for dietary management of diabetic symptoms in human patients.
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Acknowledgments
We thank Chiko Nishinosono for administrative assistance and the Joint Research Laboratory, Kagoshima University Graduate School of Medical and Dental Sciences, for the use of its facilities. This work was supported by grants from the Ministry of Education, Culture, Sports, Science, and Technology in Japan (#22500650 and #25350873 to E. A. and #21590704 to M. H.) and funded by the Kodama Memorial Fund for Medical Science Research.
Author contributions
E.A., W.P., and M.H. obtained and analysed data and wrote the manuscript. A.M., M.N., M.A., and M.U. contributed to discussions of experimental design and analysis and reviewed the manuscript.
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This study was approved by the Ethics Committee for Animal Experimentation at Kagoshima University.
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Arimura, E., Pulong, W.P., Marchianti, A.C.N. et al. Deteriorated glucose metabolism with a high-protein, low-carbohydrate diet in db mice, an animal model of type 2 diabetes, might be caused by insufficient insulin secretion. Eur J Nutr 56, 237–246 (2017). https://doi.org/10.1007/s00394-015-1075-y
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DOI: https://doi.org/10.1007/s00394-015-1075-y