Urinary biomarkers after donor nephrectomy

Area of Science:

• Nephrology
• Urology
• Surgical Innovation

Background:

• Living-donor kidney transplantation is crucial, but concerns exist regarding potential harm to the donor's remaining kidney after unilateral nephrectomy.
• Laparoscopic donor nephrectomy involves elevated intra-abdominal pressure (IAP), raising questions about its impact on renal function.

Purpose of the Study:

• To investigate whether elevated IAP during laparoscopic donor nephrectomy causes early kidney damage.
• To evaluate specific urine biomarkers indicative of kidney injury following nephrectomy and other laparoscopic procedures.

Main Methods:

• Urine samples were analyzed for albumin, alpha-1-microglobulin (α-1-MGB), kidney injury molecule 1 (KIM-1), and neutrophil gelatinase-associated lipocalin (NGAL).
• Biomarkers were measured during and after open/laparoscopic donor nephrectomy, laparoscopic cholecystectomy, and colectomy.
• Patients undergoing laparoscopic donor nephrectomy were randomized to standard or low IAP groups.

Main Results:

• Urinary albumin peaked during all procedures. Postoperative urine α-1-MGB increased after donor nephrectomy but not after cholecystectomy or colectomy.
• Slight increases in urine KIM-1 and NGAL were observed after laparoscopic nephrectomy and colectomy.
• No significant differences in biomarker levels were found between standard and low IAP groups during laparoscopic donor nephrectomy.

Conclusions:

• Elevated urinary α-1-MGB suggests kidney damage after donor nephrectomy, independent of IAP levels during the laparoscopic procedure.
• The findings indicate potential renal stress after donor nephrectomy, warranting further investigation into donor kidney protection strategies.