IQ domain GTPase-activating protein 1 mediates the process of injury and repair in bronchial epithelial cells.

Abstract	The process of injury and repair in airway epithelium involves cell spreading and migration followed by cell proliferation. IQ domain GTPase-activating protein 1 (IQGAP1) acts in a series of cell processes, but has not been clarified in lung epithelial cells. In this study, a widely used model of injury and repair in vitro by scratching bronchial epithelial cells (BECs) was utilized to investigate the function of IQGAP1. The results showed that IQGAP1 was abundant in BECs of mouse, rat, pig and human. IQGAP1 was colocalized with tubulin cytoskeleton, but was destroyed by nocodazole, a microtubule disassembly reagent. IQGAP1 mRNA and protein expressions increased at 6-9 h after scratching. In addition, overexpression of IQGAP1 translocated β-catenin from the cytoplasm into the nucleus and activated the Tcf/Lef signal. Scratching altered the associations of IQGAP1 with β-catenin, adenomatous polyposis coli (APC) and cytoplasmic linker protein-170 (CLIP-170). Silencing IQGAP1 expression by small interference RNA (siRNA) blocked the wound closure. It is concluded that IQGAP1 signal is involved in the wound closure of BECs induced by scratching.
Authors	Yong-Ping Wang, Fang Wang, Man-Xiang Wang, Min Zhu, Yan Ma, Ren-Liang Wu
Journal	Sheng li xue bao : [Acta physiologica Sinica] (Sheng Li Xue Bao) Vol. 60 Issue 3 Pg. 409-18 (Jun 25 2008) ISSN: 0371-0874 [Print] China
PMID	18560734 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Adenomatous Polyposis Coli Protein IQ motif containing GTPase activating protein 1 Microtubule-Associated Proteins Neoplasm Proteins Tubulin beta Catenin ras GTPase-Activating Proteins cytoplasmic linker protein 170 Nocodazole
Topics	Adenomatous Polyposis Coli Protein (metabolism) Animals Bronchi (cytology) Cell Proliferation Cells, Cultured Cytoskeleton (metabolism) Epithelial Cells (cytology, pathology) Humans Mice Microtubule-Associated Proteins (metabolism) Neoplasm Proteins (metabolism) Nocodazole (pharmacology) Rats Swine Tubulin (metabolism) beta Catenin (metabolism) ras GTPase-Activating Proteins (metabolism)

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