Abstract:
:Calcineurin inhibitors such as cyclosporin A (CsA) and FK506 have been used in solid organ and hematopoietic stem cell transplantations to suppress immune function. However, these immunosuppresants are associated with severe endothelial dysfunction. We investigated whether CsA and FK506 induce endothelial dysfunction using a three-dimensional culture blood vessel model, in which human umbilical vein endothelial cells form and maintain capillary-like tube and lumen structures. We found that FK506, but not CsA, induced breakdown of the tube structures and endothelial cell death. FK506 inhibited calcineurin activity, but FK506-induced tube breakdown and cell death was not suppressed by RNA interference targeting calcineurin Aα. FK506 also induced caspase activation, but caspase inhibition by zVAD(OMe)-fmk failed to suppress FK506-induced tube breakdown and cell death. FK506 induced attenuation of Akt and extracellular-regulated kinase 1/2 (ERK1/2). Furthermore, Akt inhibition by LY294002 or ERK1/2 inhibition by PD98059 induced tube breakdown and cell death. Present results suggest that FK506 induces endothelial dysfunction through attenuation of Akt and ERK1/2 independently of calcineurin inhibition and the caspase pathway.
journal_name
Cell Signaljournal_title
Cellular signallingauthors
Eguchi R,Kubo S,Ohta T,Kunimasa K,Okada M,Tamaki H,Kaji K,Wakabayashi I,Fujimori Y,Ogawa Hdoi
10.1016/j.cellsig.2013.05.008subject
Has Abstractpub_date
2013-09-01 00:00:00pages
1731-8issue
9eissn
0898-6568issn
1873-3913pii
S0898-6568(13)00133-2journal_volume
25pub_type
杂志文章abstract::Lysophosphatidic acid (LPA) mediates a variety of biological functions via the binding of G protein-coupled LPA receptors (LPA receptor-1 (LPA1) to LPA6). This study aimed to investigate the roles of LPA2 and LPA3 in the modulation of chemoresistance to anticancer drug in lung cancer A549 cells. In cell survival assay...
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journal_title:Cellular signalling
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