Erythropoietin attenuated high glucose-induced apoptosis in cultured human aortic endothelial cells.
High glucose-induced apoptosis in vascular endothelial cells may contribute to the acceleration of atherosclerosis associated with diabetes. Here, we show that erythropoietin attenuates high glucose-induced apoptosis in cultured human aortic endothelial cells (HAECs). Exposure of HAECs to high glucose level for 72h significantly increased the number of apoptotic cells compared with normal glucose level, as evaluated by TUNEL assay. Simultaneous addition of erythropoietin (100 U/ml) significantly attenuated high glucose-induced apoptosis. In parallel, exposure to high glucose level induced caspase-3 activation and erythropoietin also prevented it. Erythropoietin stimulated Akt phosphorylation in a dose-dependent manner (1-100 U/ml). PI3 kinase inhibitor, wortmannin or LY294002 eliminated erythropoietin's inhibitory effect on caspase-3 activity. In conclusion, erythropoietin may attenuate high glucose-induced endothelial cell apoptosis via PI-3 kinase pathway. Replacing therapy with erythropoietin is often used for correction of renal anemia, but may have potential in preventing atherosclerosis in diabetic patients with end-stage renal failure.
Sekiguchi
Naotaka
N
Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
Inoguchi
Toyoshi
T
Kobayashi
Kunihisa
K
Sonoda
Noriyuki
N
Nawata
Hajime
H
D001011:Aorta / Q000187:drug effects / Q000378:metabolism*; D017209:Apoptosis / Q000187:drug effects*; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism*; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D042783:Endothelial Cells / Q000187:drug effects / Q000378:metabolism*; D004921:Erythropoietin / Q000008:administration & dosage*; D005947:Glucose / Q000008:administration & dosage*; D006801:Humans; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt; D015398:Signal Transduction / Q000187:drug effects
D053148:Caspase 3; D020169:Caspases; D004921:Erythropoietin; D005947:Glucose; D019869:Phosphatidylinositol 3-Kinases; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D051057:Proto-Oncogene Proteins c-akt; C494918:AKT1 protein, human; C505407:CASP3 protein, human