ArticleAmerican journal of physiology. Lung cellular and molecular physiology2016
Role of IQGAP1 in endothelial barrier enhancement caused by OxPAPC.
Article in American journal of physiology. Lung cellular and molecular physiology, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 17 citations in OpenAlex.
- Anthrax ET activates Rac1 and RTK signaling to induce F-actin reorganization and endothelial permeability.iScience · 2025Article
- Article
- Oxidized Phospholipids in Control of Endothelial Barrier Function: Mechanisms and Implication in Lung Injury.Frontiers in endocrinology · 2021Review
- Review
- Simvastatin preparations promote PDGF-BB secretion to repair LPS-induced endothelial injury through the PDGFRβ/PI3K/Akt/IQGAP1 signalling pathway.Journal of cellular and molecular medicine · 2019Article
- Endothelial IQGAP1 regulates leukocyte transmigration by directing the LBRC to the site of diapedesis.The Journal of experimental medicine · 2019Article
- Time-Variant SRC Kinase Activation Determines Endothelial Permeability Response.Cell chemical biology · 2019Article
- Lipid mediators in the regulation of endothelial barriers.Tissue barriers · 2018Review
- Endothelial cell-cell adhesion and signaling.Experimental cell research · 2017Review
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphatidylcholine (OxPAPC) attenuates agonist-induced endothelial cell (EC) permeability and increases pulmonary endothelial barrier function via enhancement of both the peripheral actin cytoskeleton and cell junctions mediated by Rac1 and Cdc42 GTPases. This study evaluated the role for the multifunctional Rac1/Cdc42 effector and regulator, IQGAP1, as a molecular transducer of the OxPAPC-mediated EC barrier enhancing signal. IQGAP1 knockdown in endothelial cells by gene-specific siRNA abolished OxPAPC-induced enlargement of VE-cadherin-positive adherens junctions, suppressed peripheral accumulation of actin polymerization regulators, namely cortactin, N-WASP and Arp3, and attenuated remodeling of the peripheral actin cytoskeleton. Inhibition of OxPAPC-induced barrier enhancement by IQGAP1 knockdown was due to suppressed Rac1 and Cdc42 activation. Expression of an IQGAP1 truncated mutant showed that the GTPase regulatory domain (GRD) of IQGAP1 was essential for the OxPAPC-induced membrane localization of cortactin, adherens junction proteins VE-cadherin and p120-catenin as well as for EC permeability response. IQGAP1knockdown attenuated the protective effect of OxPAPC against thrombin-induced cell contraction, cell junction disruption and EC permeability. These results demonstrate for the first time the role of IQGAP1 as a critical transducer of OxPAPC-induced Rac1/Cdc42 signaling to the actin cytoskeleton and adherens junctions which promotes cortical cytoskeletal remodeling and EC barrier protective effects of oxidized phospholipids.
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