Predominant inhibition of interleukin-6 synthesis in patient-specific endothelial cells by mTOR inhibitors below a concentration range where cell proliferation is affected and mitotic arrest takes place.

Abstract:

UNLABELLED:Organ rejection and inflammation are accompanied by endothelial cell activation. An in vitro model with patient-specific endothelial cells was used to study the impact of mTOR inhibitors on cell growth and release of proinflammatory cytokines. MATERIAL AND METHODS:Confluent monolayers of human saphenous vein endothelial cells were pretreated with everolimus or sirolimus followed by induction with tumour necrosis factor-alpha (TNF-alpha). RESULTS:Incubation with sirolimus or everolimus resulted in a dose-dependent deceleration of cell growth. Compared to control, cell count at high concentrations ceased to increase and remained at 60%. This mitotic arrest was accompanied by a dose-dependent inhibition of the TNF-alpha-induced in situ synthesis and release of interleukin-6 per cell by 60%. CONCLUSIONS:Under conditions mimicking cytokine-induced cell activation a predominant inhibitory effect of everolimus compared to sirolimus on endothelial cell proliferation was observed paralleled by an inhibition of proinflammatory cytokines. This might attenuate the acute proinflammatory status after transplantation.

journal_name

Transplant Proc

authors

Lehle K,Birnbaum DE,Preuner JG

doi

10.1016/j.transproceed.2004.12.140

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

159-61

issue

1

eissn

0041-1345

issn

1873-2623

pii

S0041-1345(04)01591-X

journal_volume

37

pub_type

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