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Updated: Apr 11, 2026
Robot-Assisted Kidney Transplantation
Published on: July 19, 2021
Laparoscopic transplantation of metanephroi: A first step to kidney xenotransplantation
C D Vera-Donoso1, X García-Dominguez2, E Jiménez-Trigos2
1Servicio de Urología, Hospital Universitario y Politécnico La Fe, Valencia, España.
Background:
Embryonic kidney xenotransplantation could represent a new solution to the scarcity of kidneys for transplantation.
Objective:
To determine the feasibility of allogeneic laparoscopic transplantation of metanephroi (M) in rabbits.
Material And Method:
Microscopic dissection was conducted to obtain metanephroi from 14-day-old (24M), 15-day-old (20M) and 16-day-old (26M) embryos. Using single-port abdominal laparoscopy, a spinal needle was inserted percutaneously, through which the metanephroi were deposited (using an epidural catheter) close to a patent blood vessel in the retroperitoneal fat. Seventy metanephroi were transplanted to 18 rabbits. Three weeks later, the animals were examined through open surgery. We compared the embryonic maturity, the morphometric variables of the metanephroi and the development rate of the transplanted metanephroi.
Results:
The lower time limit for the extraction of metanephroi from the rabbits was day 14. Three weeks after transplantation, only 3/24 14-day-old metanephroi grew at minimal expression (12.5%). In contrast, 10/20 (50%) 15-day-old and 12/26 (46.1%) 16-day-old metanephroi grew. These metanephroi had differentiated sufficiently for the glomeruli, proximal and distal tubules and collecting ducts to develop normally. We detected no relevant immunological changes in the peripheral blood.
Conclusions:
We have described for the first time in the literature the allogeneic laparoscopic transplantation of metanephroi from embryos as a feasible and noninvasive technique. The recipients did not require immunosuppression.
Insights
Embryonic kidney xenotransplantation using metanephroi is a feasible solution for kidney scarcity. Laparoscopic transplantation of 15- and 16-day-old embryonic rabbit kidneys (metanephroi) showed successful growth without immunosuppression.
Area of Science:
- Regenerative Medicine
- Transplantation Biology
- Surgical Innovation
Background:
- Kidney transplantation faces donor scarcity.
- Embryonic kidney xenotransplantation offers a potential solution.
- Metanephroi transplantation is an emerging field.
Purpose of the Study:
- To assess the feasibility of allogeneic laparoscopic transplantation of embryonic rabbit kidneys (metanephroi).
- To evaluate the growth and development of transplanted metanephroi.
- To determine the optimal embryonic age for metanephroi transplantation.
Main Methods:
- Metanephroi were harvested from 14-, 15-, and 16-day-old embryonic rabbits.
- Single-port abdominal laparoscopy was used for transplantation into recipient rabbits.
- Transplanted metanephroi were assessed after three weeks for growth and differentiation.
Main Results:
- Metanephroi from 15- and 16-day-old embryos showed significant growth (50% and 46.1% respectively) three weeks post-transplantation.
- Successfully transplanted metanephroi exhibited normal development of glomeruli, tubules, and collecting ducts.
- No significant immunological rejection was observed in recipients.
Conclusions:
- Allogeneic laparoscopic transplantation of embryonic metanephroi is a feasible and minimally invasive technique.
- This method represents a promising approach for addressing kidney donor shortages.
- Successful transplantation was achieved without the need for immunosuppression.
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