High glucose increases B1-kinin receptor expression and signaling in endothelial cells

• Published in: Biochemical and biophysical research communications 2006-06, Vol.345 (2), p.652-659
• Main Authors: Rodriguez, Andrés I., Pereira-Flores, Karla, Hernández-Salinas, Romina, Boric, Mauricio P., Velarde, Victoria
• Format: Article
• Language: English
• Subjects: Amidines - pharmacology; Animals; B1 receptor; Benzylamines - pharmacology; Bradykinin - analogs & derivatives; Bradykinin - pharmacology; Diabetes; Diabetes Mellitus, Experimental - drug therapy; Endothelial Cells - drug effects; Endothelial Cells - physiology; Endothelial dysfunction; Enzyme Inhibitors - pharmacology; Gene Expression Regulation - drug effects; Gene Expression Regulation - physiology; Glucose - pharmacology; iNOS; Kinins; NG-Nitroarginine Methyl Ester - pharmacology; Nitric Oxide Synthase - drug effects; Nitric Oxide Synthase - metabolism; Nitrites - metabolism; Rats; Receptor, Bradykinin B1 - drug effects; Receptor, Bradykinin B1 - metabolism; RNA, Messenger - metabolism; Signal Transduction - drug effects; Signal Transduction - physiology; Signaling; Time Factors; Vasodilator Agents - pharmacology
• ISSN: 0006-291X; 1090-2104
• DOI: 10.1016/j.bbrc.2006.04.127

The loss of endothelial function is the initiating factor in the development of diabetic vascular disease. Kinins control endothelial function by the activation of two receptors: the B2 which is constitutively expressed, and the B1 which is highly induced in pathological conditions. In the present study, we observed that the levels of B1-receptor mRNA and protein are induced in endothelial cells incubated in high glucose. An increase in B1-receptor was also observed in the endothelial layer of aortas, from 4-week diabetic rats. When cells were grown in high glucose, the B1 agonist des-Arg 9-BK increased nitrite levels, whereas in normal glucose nitrite levels were unchanged. Nitrite increase was blocked by L-NAME and 1400W indicating the participation of the inducible Nitric Oxide Synthase (iNOS). iNOS protein levels were also increased in high glucose. These results demonstrate the participation of the B1 receptor in the signaling pathways mediated by kinins in high glucose.