期刊
AMERICAN JOURNAL OF PHYSIOLOGY-RENAL PHYSIOLOGY
卷 295, 期 2, 页码 F446-F453出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajprenal.00095.2008
关键词
renal inflammatory conditions; mouse inner medullary collecting duct cell line; nuclear factor-kappa B; inflammatory cytokines
资金
- NHLBI NIH HHS [P01 HL074167, P01 HL074167-030004, HL-74176, P01 HL074167-040004, HL-60653, P01 HL074167-050004, HL-64776, P01 HL074167-020004] Funding Source: Medline
The inflammatory cytokines IL-1 beta and IL-6 have been shown to stimulate production of endothelin-1 (ET-1) by several cell types in vitro, but their effects on renal ET-1 production in vivo are not known. To test whether IL-1 beta and IL-6 stimulate renal ET-1 production and release in vivo, urine was collected from male C57BL/6 mice over 24-h periods at baseline and on days 7 and 14 of a 14-day subcutaneous infusion of IL-1 beta (10 ng/h), IL-6 (16 ng/h), or vehicle. By day 14, plasma ET-1 was significantly increased by IL-1 beta infusion (1.7 +/- 0.1 vs. 0.8 +/- 0.1 pg/ml for vehicle, P < 0.001). Compared with vehicle infusion, IL-1 beta infusion induced significant increases in urinary ET-1 excretion rate and urine flow but did not affect conscious mean arterial pressure (telemetry). IL-1 beta infusion significantly increased renal cortical and medullary IL-1 beta content (ELISA) and prepro-ET-1 mRNA expression (quantitative real-time PCR). In contrast, 14 days of IL-6 infusion had no significant effect on plasma ET-1 or urinary ET-1 excretion rate. To determine whether IL-1 beta stimulates ET-1 release via activation of NF-kappa B, inner medullary collecting duct (IMCD-3) cells were incubated for 24 h with IL-1 beta, and ET-1 release and NF-kappa B activation were measured (ELISA). IL-1 beta activated NF-kappa B and increased ET-1 release in a concentration-dependent manner. The effect of IL-1 beta on ET-1 release could be partially inhibited by pretreatment of IMCD-3 cells with an inhibitor of NF-kappa B activation (BAY 117082). These results indicate that IL-1 beta stimulates renal and systemic ET-1 production in vivo, providing further evidence that ET-1 participates in inflammatory responses.
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