Cyclosporine induces endothelin-1 mRNA synthesis and nitric oxide production in human proximal tubular epithelial cell cultures.
BACKGROUND
Cyclosporine (CsA) is implicated in the development of chronic allograft nephropathy, which is related to reduced long-term allograft survival. The activation of tubular epithelial cells is involved in the renal scarring process via stimulation of factors such as endothelin-1 (ET-1) and nitric oxide (NO). The effect of CsA on the activation of tubular epithelial cells towards increased production of ET-1 and NO was investigated in this study.


METHODS
Human tubular epithelial cells (HK-2) were cultured in the presence of CsA at different concentrations (125, 250, 500, and 1,000 ng/mL). ET-1 m-RNA and NO production were measured using RT-PCR and Griess method, respectively. The cytotoxic effect of CsA was examined by the MTT method and cell count.


RESULTS
A statistically significant and dose-dependent cytotoxic effect of cyclosporine on HK-2 cells was observed. A dose-dependent up-regulation of ET-1 mRNA production and NO accumulation was observed under the influence of CsA.


CONCLUSIONS
Increased synthesis of endothelin-1 mRNA and nitric oxide as well as a significant cytotoxic effect on tubular epithelial cells under the influence of CsA might be related to the development of CsA nephrotoxicity.
Department of Internal Medicine-Nephrology, Patras University Hospital, Patras, Greece.
Evangelos
E
Papachristou
Athanasios
A
Papadimitropoulos
Panagiotis
P
Kotsantis
Dimitrios S
DS
Goumenos
Panagiotis G
PG
Katsoris
John G
JG
Vlachojannis
D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D017077:Culture Media, Conditioned; D016572:Cyclosporine / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D019332:Endothelin-1 / Q000096:biosynthesis*; D004847:Epithelial Cells / Q000166:cytology; D006801:Humans; D007687:Kidney Tubules, Proximal / Q000166:cytology*; D009569:Nitric Oxide / Q000096:biosynthesis*; D011336:Probability; D012333:RNA, Messenger / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction
D017077:Culture Media, Conditioned; D019332:Endothelin-1; D012333:RNA, Messenger; D009569:Nitric Oxide; D016572:Cyclosporine