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Technology Insight: innovative options for end-stage renal disease—from kidney refurbishment to artificial kidney

Abstract

The steadily growing number of patients with chronic kidney disease who will eventually develop end-stage renal disease, together with the qualitative limitations of currently available renal replacement therapies, have triggered the exploration of innovative strategies for renal replacement therapy and for salvage of renal function. Currently, new hemodialysis modalities and membranes are being used with the aim of increasing clearance of uremic toxins to afford better metabolic control. In addition to these conventional approaches, there are four innovative potential solutions to the problem of replacing renal function when kidneys fail. The first is a small, implantable device with the potential to be supplemented with human cells ('artificial kidney'). The second involves restoration of the damaged kidney by harnessing recent advances in stem-cell technology and knowledge of developmental programing ('refurbished kidney'). The third is (partially) growing a kidney in vitro with the use of therapeutic cloning ('cultured kidney'). The fourth innovative solution involves the use of other organs to replace various renal functions ('distributed kidney'). In this article we review the efforts that have been made to improve renal replacement therapies, and explore innovative approaches. We will not cover all potential solutions in detail. Rather, we aim to indicate directions of future endeavor and arouse enthusiasm in clinicians and scientists for exploration of these exciting avenues.

Key Points

  • Unless conventional dialysis techniques can be considerably improved, the ever-increasing burden of chronic kidney disease will necessitate the development of innovative new renal replacement therapies

  • The use of xenotransplantation continues to be investigated

  • Nanotechnology could be a platform for the development of a lightweight and reliable artificial kidney that could be worn or implanted

  • The integration of new nephrons, repair of native renal tissue by using stem cells derived from bone marrow or kidney, and generation of replacement tissue using nuclear transplantation and embryonic stem cells, are all promising avenues of investigation

  • The 'hosting' of renal functions in nonrenal tissues, and harnessing of developmental plasticity in adults, might also help to overcome kidney dysfunction

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Figure 1: Principle of a mechanical two-step filter device.
Figure 2: The developmental plasticity continuum, from the perinatal programing hypothesis to refurbishment strategies.
Figure 3: Persistent lowering of arterial pressure with brief antihypertensive therapy (30 mg/kg/day enalapril plus low salt intake [ELS]) in adult spontaneously hypertensive rats (CON).

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Acknowledgements

B Braam was supported by a research fellowship from the Royal Netherlands Academy of Arts and Sciences. MC Verhaar is supported by the Netherlands Organization for Scientific Research (NWO grant 016.036.041). Studies cited in this report were supported by the Dutch Kidney Foundation (grants NS6013, C03.2039, PC127 and C04.2093).

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Correspondence to Branko Braam.

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Braam, B., Verhaar, M., Blankestijn, P. et al. Technology Insight: innovative options for end-stage renal disease—from kidney refurbishment to artificial kidney. Nat Rev Nephrol 3, 564–572 (2007). https://doi.org/10.1038/ncpneph0600

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