期刊
INTERNATIONAL IMMUNOPHARMACOLOGY
卷 2, 期 13-14, 页码 1995-2003出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1567-5769(02)00169-8
关键词
bradykinin; radioimmunoassay; angiotensin-converting enzyme; vascular smooth muscle cells
资金
- NHLBI NIH HHS [HL71255] Funding Source: Medline
- NIGMS NIH HHS [GM64048] Funding Source: Medline
The peptide hormone bradykinin is a mediator in many physiological and pathological processes. The generation and, to a limited extent, metabolism occur at the sites of action. The short half-life of bradykinin (similar to15 s) renders measurements of its concentration in bodily fluids difficult. As a result, recent methods utilizing either ELISA or HPLC/mass spectrometry, have been developed for the measurement of the stable metabolic endproduct of bradykinin, i.e., the pentapeptide Arg-Pro-Pro-Gly-Phe (RPPGF; BK[1-5]). Both have been successfully used to quantitate levels of RPPGF in plasma, pulmonary and nasal exudates. In this study, we demonstrate the characterization and utility of a radioimmumoassay for the measurement of RPPGF, using a newly synthesized radioiodinated analogue of RPPGF, i.e., RPPG(I-125)F. This radioimmunoassay shows an IC50 of 80.5 +/- 7.4 pg/tube (n = 23) with a linear range of detection between 10 and 500 pg/tube. The assay was used to demonstrate the time-dependent generation of RPPGF by cultured rat aortic vascular smooth muscle cells exposed to bradykinin (100 ng/ml). Peak generation of RPPGF was 74.5 +/- 9.7 pmol/well (n = 5) after 24 h of incubation. Captopril, an inhibitor of angiotensin-converting enzyme (kininase II), inhibited generation in a concentration-dependent manner. The results characterize a new radioimmunoassay for the stable metabolic endproduct of bradykinin, RPPGF. (C) 2002 Elsevier Science B.V. All rights reserved.
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