Abstract
A mathematical model of renal hemodynamics is developed in this study to investigate autoregulation in the rat kidney under physiological and pathophysiological conditions. The model simulates the blood supply to a nephron via the afferent arteriole, the filtration of blood through the glomerulus, and the transport of water and ions in the thick ascending limb of the short loop of Henle. The afferent arteriole exhibits the myogenic response, which induces changes in vascular smooth muscle tone in response to hydrostatic pressure variations. Chloride transport is simulated along the thick ascending limb, and the concentration of chloride at the macula densa provides the signal for the constriction or dilation of the afferent arteriole via tubuloglomerular feedback (TGF). With this configuration, the model predicts a stable glomerular filtration rate within a physiological range of perfusion pressure (60–180 mmHg). The contribution of TGF to overall blood flow autoregulation in the kidney is significant only within a narrow band of perfusion pressure values. Simulations of renal autoregulation under conditions of diabetes mellitus yield a > 60% increase in glomerular filtration rate, due in large part to the impairment of the voltage-gated Ca2+ channels of the afferent arteriole smooth muscle cells.
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Acknowledgements
The first three authors “Julia Arciero, Laura Ellwein, and Ashlee N. Ford Versypt” contributed equally. The work of the first author “Julia Arciero” was supported in part by the National Science Foundation (NSF), grant DMS-1224195. The work of the fifth author “Anita T. Layton” was supported in part by the NSF, grant DMS-1263995, and by the National Institutes of Health: National Institute of Diabetes and Digestive and Kidney Diseases, grant DK089066.
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Arciero, J., Ellwein, L., Versypt, A.N.F., Makrides, E., Layton, A.T. (2015). Modeling Blood Flow Control in the Kidney. In: Jackson, T., Radunskaya, A. (eds) Applications of Dynamical Systems in Biology and Medicine. The IMA Volumes in Mathematics and its Applications, vol 158. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-2782-1_3
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