Abstract:
:Endothelial argininosuccinate synthetase 1 (ASS1) regulates the provision of l-arginine to nitric oxide synthase 3 (NOS3). Previous studies demonstrated that endothelial ASS1 expression was induced by laminar shear stress (LSS) and that this enzyme plays a role in maintaining anti-inflammatory microenvironments through enhancing NO production. However, differently from the case of NOS3, the regulatory mechanism for the endothelial ASS1 expression in response to LSS is not well understood. This study addressed a specific issue whether endothelial ASS1 expression is regulated by Kruppel-like factors (KLFs) that are presumed to coordinate endothelial gene expressions in response to LSS. The cDNA microarray data indicated that LSS stimulated the expression of numerous KLFs in human umbilical vein endothelial cells. KLF4 showed the highest fold increase and LSS-dependent increases of KLF4 and most other KLFs were similar in young versus senescent endothelial cells. LSS-induced KLF4 expression was verified by RT-PCR and Western blotting. LSS-induced ASS1 expression and NO production were suppressed by a small interfering RNA for KLF4. The ectopic expression of KLF4 led to the increase of ASS1 expression and NO production. The present study demonstrated a key regulatory role of KLF4 in the endothelial ASS1 expression and NO production in response to LSS.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Mun GI,Boo YCdoi
10.1016/j.bbrc.2012.03.016subject
Has Abstractpub_date
2012-04-06 00:00:00pages
450-5issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(12)00454-8journal_volume
420pub_type
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