Abstract
We use a highly detailed mathematical model of renal hemodynamics and solute transport to simulate medullary oxygenation in the kidney of a diabetic rat. Model simulations suggest that alterations in renal hemodynamics, which include diminished vasoconstrictive response of the afferent arteriole as a major factor, lead to glomerular hyperfiltration in diabetes. The resulting higher filtered Na+ load increases the reabsorptive work of the nephron, but by itself does not significantly elevate medullary oxygen consumption. The key explanation for diabetes-related medullary hypoxia may be impaired renal metabolism. Tubular transport efficiency is known to be reduced in diabetes, leading to increased medullary oxygen consumption, despite relatively unchanged active Na+ transport. The model predicts that interstitial fluid oxygen tension of the inner stripe, which is a particularly oxygen-poor region of the medulla, decreases by 18.6% in a diabetic kidney.
The original version of this chapter was revised. An erratum to this chapter can be found at https://doi.org/10.1007/978-3-319-60304-9_13
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Acknowledgements
This work is the product of a workshop and short-term visits supported by the National Institute for Mathematical and Biological Synthesis, an Institute sponsored by the National Science Foundation through NSF Award #DBI-1300426, with additional support from The University of Tennessee, Knoxville. Support was also provided by the National Institutes of Health: National Institute of Diabetes and Digestive and Kidney Diseases and by the National Science Foundation, via grants #DK089066 and #DMS-1263995 to AT Layton.
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Sgouralis, I., Layton, A.T. (2017). Modeling Blood Flow and Oxygenation in a Diabetic Rat Kidney. In: Layton, A., Miller, L. (eds) Women in Mathematical Biology. Association for Women in Mathematics Series, vol 8. Springer, Cham. https://doi.org/10.1007/978-3-319-60304-9_6
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