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Preoperative ManagementThe primary goals of preoperative management in kidney transplantation are to optimize the patient’s metabolic state and prepare them for surgery through diet adjustments, necessary dialysis, and tailored medical treatment. This phase also involves comprehensive infection screening and patient education about the surgical procedure and postoperative care to improve outcomes and adherence.Medical ManagementA comprehensive evaluation is required for both the living...
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A kidney transplant is a surgical approach that involves replacing a non-functioning kidney with a healthy one from a donor. This procedure is often a treatment option for end-stage renal disease (ESRD) patients. The method requires careful recipient selection, including evaluating various medical and psychosocial factors. These criteria vary between transplant centers but generally include assessments of the patient's overall health, adherence to medical recommendations, and lifestyle...
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The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.
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Related Experiment Video

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Author Spotlight: Optimizing iPSC Differentiation for Efficient Production to Generate Kidney Organoids
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Urine excretion strategy for stem cell-generated embryonic kidneys.

Shinya Yokote1, Hitomi Matsunari2, Satomi Iwai3

  • 1Division of Nephrology and Hypertension, Department of Internal Medicine, Jikei University School of Medicine, Minato-ku, Tokyo 105-8461, Japan;

Proceedings of the National Academy of Sciences of the United States of America
|September 23, 2015
PubMed
Summary

Researchers developed a stepwise peristaltic ureter (SWPU) system to create functional kidneys from stem cells. This novel approach successfully constructs a urine excretion pathway, overcoming a major hurdle in regenerative medicine for kidney development.

Keywords:
cloned pigkidney generationmetanephrossomatic cell nuclear transfertransplantation

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Area of Science:

  • Regenerative Medicine
  • Developmental Biology
  • Urology

Background:

  • Generating functional kidneys de novo from stem cells remains a significant challenge.
  • Existing methods using organogenic niche or blastocyst complementation fail to establish a urinary excretion pathway.
  • Previous attempts, like transplanting cloned pig metanephroi, resulted in urine production but also hydronephrosis due to the lack of an exit route.

Purpose of the Study:

  • To develop and validate a method for constructing a functional urine excretion pathway in stem cell-derived kidneys.
  • To address the limitations of current kidney regeneration strategies, specifically the absence of a urinary tract.
  • To demonstrate the efficacy of the stepwise peristaltic ureter (SWPU) system in preventing hydronephrosis and enabling persistent urine excretion.

Main Methods:

  • Transplantation of cloned pig metanephroi into gilts to assess growth and urine production.
  • Rat metanephroi and cloaca-derived bladders were transplanted into host rats to evaluate urine excretion pathways.
  • Development and application of the stepwise peristaltic ureter (SWPU) system, connecting the host ureter to the cloaca-derived bladder.
  • Preclinical validation of the SWPU system in cloned pigs.

Main Results:

  • Transplanted metanephroi in pigs grew and produced urine, but hydronephrosis occurred without an excretion pathway.
  • Rat transplants with cloaca-derived bladders showed reduced histopathologic damage compared to metanephroi-only transplants.
  • The SWPU system successfully prevented hydronephrosis in both rat and pig models.
  • Persistent urine excretion was achieved, and cloacas differentiated well in SWPU-treated animals.

Conclusions:

  • The stepwise peristaltic ureter (SWPU) system is a viable solution for creating functional urine excretion pathways in engineered kidneys.
  • This technique addresses critical challenges in stem cell-based kidney generation, enabling both pathway construction and sustained organ growth.
  • The SWPU system represents a significant preclinical advancement for regenerative medicine in kidney development.