Renal prednisolone accumulation after LP treatment. A, Prednisolone concentration in the allograft and contralateral kidney was determined using HPLC. At d 7 post-Tx, prednisolone was detected in higher quantities in allografts of mice treated with LP, but not in allografts of mice treated with P alone. The contralateral native kidney of the recipient treated with LP contained also lower levels of prednisolone. Data points represent individual mice. * P < 0.05, unpaired Students t-test, N = 4 per group. B, Messenger RNA expression of the glucocorticoid responsive gene Fkbp5 in the allografts is plotted as copies per actin. Expression is upregulated in LP-treated allografts, compared with P and NA treated (mean ± SD. **P < 0.01, one-way analysis of variance with a Tukey multiple comparisons test. NA = no additional treatment; N = 8, P = prednisolone; N = 10, LP = liposomal prednisolone; N = 8. HPLC, high performance liquid chromatography.