Effects of 5,14-HEDGE, a 20-HETE Mimetic, on Lipopolysaccharide-induced Changes in MyD88/TAK1/IKKβ/IκB-α/NF-κB Pathway and Circulating MiR-150, MiR-223, and MiR-297 Levels in a Rat Model of Septic Shock

Overview

Journal Inflamm Res

Specialties Allergy & Immunology
Pathology

Date 2014 Jun 12

PMID 24915805

Citations 15

Authors

A Nihal Sari

Belma Korkmaz

Mehmet Sami Serin

Meltem Kacan

Demet Unsal

C Kemal Buharalioglu

Seyhan Sahan Firat

Vijay L Manthati

John R Falck

Kafait U Malik

Bahar Tunctan

Affiliations

Soon will be listed here.

Abstract

Objectives: We have previously demonstrated that a stable synthetic analog of 20-hydroxyeicosatetraenoic acid (20-HETE), N-(20-hydroxyeicosa-5[Z],14[Z]-dienoyl)glycine (5,14-HEDGE), which mimics the effects of endogenously produced 20-HETE, prevents vascular hyporeactivity, hypotension, tachycardia, inflammation, and mortality in a rodent model of septic shock. The present study was performed to determine whether decreased renal and cardiovascular expression and activity of myeloid differentiation factor 88 (MyD88)/transforming growth factor-activated kinase 1 (TAK1)/inhibitor of κB (IκB) kinase β (IKKβ)/IκB-α/nuclear factor-κB (NF-κB) pathway and reduced circulating microRNA (miR)-150, miR-223, and miR-297 expression levels participate in the protective effect of 5,14-HEDGE against hypotension, tachycardia, and inflammation in response to systemic administration of lipopolysaccharide (LPS).

Methods: Conscious male Wistar rats received saline (4 ml/kg) or LPS (10 mg/kg) at time 0. Blood pressure and heart rate were measured using a tail-cuff device. Separate groups of LPS-treated rats were given 5,14-HEDGE (30 mg/kg) 1 h after injection of saline or LPS. The rats were killed 4 h after LPS challenge and blood, kidney, heart, thoracic aorta, and superior mesenteric artery were collected for measurement of the protein expression.

Results: LPS-induced fall in blood pressure and rise in heart rate were associated with increased MyD88 expression and phosphorylation of TAK1 and IκB-α in cytosolic fractions of the tissues. LPS also caused an increase in both unphosphorylated and phosphorylated NF-κB p65 proteins in the cytosolic and nuclear fractions as well as nuclear translocation of NF-κB p65. In addition, serum miR-150, miR-223, and miR-297 expression levels were increased in LPS-treated rats. These effects of LPS were prevented by 5,14-HEDGE.

Conclusions: These results suggest that downregulation of MyD88/TAK1/IKKβ/IκB-α/NF-κB pathway as well as decreased circulating miR-150, miR-223, and miR-297 expression levels participate in the protective effect of 5,14-HEDGE against hypotension, tachycardia, and inflammation in the rat model of septic shock.

Citing Articles

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