Lysophosphatidic acid receptor 1 modulates lipopolysaccharide-induced inflammation in alveolar epithelial cells and murine lungs.

Abstract

Lysophosphatidic acid (LPA), a bioactive phospholipid, plays an important role in lung inflammation by inducing the release of chemokines and lipid mediators. Our previous studies have shown that LPA induces the secretion of interleukin-8 and prostaglandin E(2) in lung epithelial cells. Here, we demonstrate that LPA receptors contribute to lipopolysaccharide (LPS)-induced inflammation. Pretreatment with LPA receptor antagonist Ki16425 or downregulation of LPA receptor 1 (LPA(1)) by small-interfering RNA (siRNA) attenuated LPS-induced phosphorylation of p38 MAPK, I-κB kinase, and I-κB in MLE12 epithelial cells. In addition, the blocking of LPA(1) also suppressed LPS-induced IL-6 production. Furthermore, LPS treatment promoted interaction between LPA(1) and CD14, a LPS coreceptor, in a time- and dose-dependent manner. Disruption of lipid rafts attenuated the interaction between LPA(1) and CD14. Mice challenged with LPS increased plasma LPA levels and enhanced expression of LPA receptors in lung tissues. To further investigate the role of LPA receptors in LPS-induced inflammation, wild-type, or LPA(1)-deficient mice, or wild-type mice pretreated with Ki16425 were intratracheally challenged with LPS for 24 h. Knock down or inhibition of LPA(1) decreased LPS-induced IL-6 release in bronchoalveolar lavage (BAL) fluids and infiltration of cells into alveolar space compared with wild-type mice. However, no significant differences in total protein concentration in BAL fluids were observed. These results showed that knock down or inhibition of LPA(1) offered significant protection against LPS-induced lung inflammation but not against pulmonary leak as observed in the murine model for lung injury.

• Authors: Jing Zhao, Donghong He, Yanlin Su, Evgeny Berdyshev, Jerold Chun, Viswanathan Natarajan, Yutong Zhao
• Journal: American journal of physiology. Lung cellular and molecular physiology (Am J Physiol Lung Cell Mol Physiol) Vol. 301 Issue 4 Pg. L547-56 (Oct 2011) ISSN: 1522-1504 [Electronic] United States
• PMID: 21821728 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• 3-(4-(4-((1-(2-chlorophenyl)ethoxy)carbonyl amino)-3-methyl-5-isoxazolyl) benzylsulfanyl) propanoic acid
• Interleukin-6
• Interleukin-8
• Isoxazoles
• Lipopolysaccharide Receptors
• Lipopolysaccharides
• Lysophospholipids
• NF-kappa B
• Propionates
• Receptors, Lysophosphatidic Acid
• p38 Mitogen-Activated Protein Kinases
• lysophosphatidic acid

Topics

• Animals
• Bronchi (drug effects, metabolism, pathology)
• Bronchoalveolar Lavage Fluid (chemistry)
• Cells, Cultured
• Epithelial Cells (cytology, drug effects, metabolism)
• Gene Expression Regulation
• Inflammation (genetics, metabolism)
• Interleukin-6 (genetics, metabolism)
• Interleukin-8 (genetics, metabolism)
• Isoxazoles (pharmacology)
• Lipopolysaccharide Receptors (genetics, metabolism)
• Lipopolysaccharides (pharmacology)
• Lysophospholipids (pharmacology)
• Male
• Membrane Microdomains (drug effects, metabolism)
• Mice
• Mice, Knockout
• NF-kappa B (genetics, metabolism)
• Phosphorylation
• Propionates (pharmacology)
• Pulmonary Alveoli (drug effects, metabolism, pathology)
• Receptor Cross-Talk (drug effects)
• Receptors, Lysophosphatidic Acid (genetics, metabolism)
• Signal Transduction (drug effects)
• p38 Mitogen-Activated Protein Kinases (genetics, metabolism)