Cariporide inhibits high glucose-mediated adhesion of monocyte-endothelial cell and expression of intercellular adhesion molecule-1.
The aim of this study was to examine whether cariporide, a new inhibitor of Na(+)/H(+) exchanger 1 (NHE-1), may inhibit high glucose-induced monocyte-endothelial cell adhesion and the expression of intercellular adhesion molecule-1 (ICAM-1). Cultured endothelial cells were incubated with normal glucose control (5.5 mM), cariporide control (5.5 mM glucose plus 10 microM cariporide), hyperosmolarity (5.5 mM glucose plus 16.5 mM mannitol), high glucose (HG, 22 mM), low-concentration cariporide (22 mM glucose plus 0.1 microM cariporide), medium-concentration cariporide (22 mM glucose plus 1 muM cariporide), and high-concentration cariporide (22 mM glucose plus 10 microM cariporide) for 24 h. Monocytes were isolated from peripheral human blood. Adhered monocytes were quantified by measuring their protein content. ICAM-1 expression and NHE-1 activity was determined with enzyme-linked immunosorbent assay (ELISA) and pH-sensitive fluorescent spectrophotometry. Exposure of endothelial cells to HG for 24 h caused an increase of adhesion of monocytes to endothelial cells and an increased expression of ICAM-1. However, these effects were reversed by treatment with cariporide (0.1, 1, 10 microM) in a concentration-dependent manner. Furthermore, cariporide (1 microM) was able to inhibit the activation of NHE-1 induced by HG in endothelial cells. These findings suggest that cariporide might inhibit HG-mediated monocyte-endothelial cell adhesion and expression of ICAM-1 by inhibiting the activation of NHE-1.
Wang
Shuang Xi
SX
Department of Pharmacology, Pharmaceutical College, Central South University, Changsha, HN 410078, China.
Sun
Xue Ying
XY
Zhang
Xiao Hong
XH
Chen
Shuang Xiu
SX
Liu
Yu Hui
YH
Liu
Li Ying
LY
D000889:Anti-Arrhythmia Agents / Q000494:pharmacology*; D027682:Cation Transport Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D002448:Cell Adhesion / Q000187:drug effects*; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000187:drug effects*; D004797:Enzyme-Linked Immunosorbent Assay; D005947:Glucose / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D006146:Guanidines / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D018799:Intercellular Adhesion Molecule-1 / Q000096:biosynthesis*; D008565:Membrane Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D009000:Monocytes / Q000187:drug effects*; D009994:Osmolar Concentration; D000074082:Sodium-Hydrogen Exchanger 1; D017923:Sodium-Hydrogen Exchangers / Q000037:antagonists & inhibitors / Q000502:physiology*; D013050:Spectrometry, Fluorescence; D013450:Sulfones / Q000494:pharmacology*
D000889:Anti-Arrhythmia Agents; D027682:Cation Transport Proteins; D006146:Guanidines; D008565:Membrane Proteins; C490998:SLC9A1 protein, human; D000074082:Sodium-Hydrogen Exchanger 1; D017923:Sodium-Hydrogen Exchangers; D013450:Sulfones; D018799:Intercellular Adhesion Molecule-1; C093373:cariporide; D005947:Glucose