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Rapamycin prevents interstitial fibrosis in renal allografts through decreasing angiogenesis and inflammation.

Abstract：

:Rapamycin (RPM) has antiangiogenic and antiproliferative effects on cells. The aim of this study was to evaluate the mechanism of RPM as a novel antifibrotic agent by assessing its effect on interstitial fibrosis (IF). Among 60 renal transplant recipients, group 1 patients (n=20) were treated with RPM and group 2 (n=40), with cyclosporine. The proportions of infiltrating macrophages and lymphocytes in the interstitium were evaluated in 1-year biopsies. The microvessels were highlightened with CD34. After an initial biopsy, the development of diffuse IF over 18 months was evaluated by follow-up biopsies. The mean microvessel density (MVD) was significantly lower among group 1 (69.3±16) versus group 2 (96.5±30; P<.001). The proportions of macrophages and lymphocytes were lower in group 1 compared to group 2 biopsies (P<.001 for both). Fourteen (35%) group 2 and only 2 (10%) group 1 cases developed IF over 18 months (P<.05). The mean MVD in the initial biopsy was 75.6±18 in cases that did not versus 120±28 among those who did develop IF (P<.001). The amount of interstitial inflammation was greater among patients who did compared with cases who did not develop IF (P<.01). The overall 1-, 3-, and 5-year graft survival rates for group 1 were 95%, 95%, and 89% versus 95%, 65%, and 45% for group 2 patients, respectively (P<.001). RPM-treated patients showed a lower incidence of diffuse IF, which can be explained by antiproliferative and antiangiogenic effects of RPM. In conclusion, RPM therapy displayed an independently positive impact on long-term graft survival.

journal_name

Transplant Proc

journal_title

Transplantation proceedings

authors

Özdemir BH,Özdemir AA,Erdal R,Özdemir FN,Haberal M

doi

10.1016/j.transproceed.2011.01.080

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

524-6

issue

2

eissn

0041-1345

issn

1873-2623

pii

S0041-1345(11)00164-3

journal_volume

43

pub_type

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