Murine kidney transplant outcome is best measured by transdermal glomerular filtration rate.

Mouse kidney transplantation provides a powerful preclinical model for the study of kidney transplant alloimmunity. However, accurate measurement of graft function is difficult because of the inaccuracy of traditional surrogate markers serum creatinine and urea. We report the use of transdermal glomerular filtration rate measurement under the experimental conditions of unilateral nephrectomy and allogeneic kidney transplantation. Our findings demonstrate that transdermal glomerular filtration rate measurement is easy to perform, reproducible, and has more interexperimental consistency than serum creatinine or urea measurements. Most importantly, it significantly reduces the numbers of experimental animals required to detect subtle and yet clinically relevant differences in kidney function as often is the case in experimental murine kidney transplantation models.