JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Integrins functioning in uterine endometrial stromal and epithelial cells in estrus.

Reproduction 2017 March
Here, as a basic study in the construction of a non-cellular niche that supports artificial organization of three-dimensional endometrial tissue, we defined the types of integrin heterodimers that are expressed transcriptionally, translationally and functionally in endometrial stromal (ES) and endometrial epithelial (EE) cells isolated from the mouse uterus in estrus. Gene and protein expression of integrin subunits were analyzed at the transcriptional and translational level by real-time PCR and fluorescent immunoassay, respectively. Moreover, the functionality of integrin heterodimers was confirmed by attachment and antibody inhibition assays. Itga2, Itga5, Itga6, Itga9, Itgav, Itgb1, Itgb3 and Itgb5 in ES cells, and Itga2, Itga5, Itga6, Itga7, Itga9, Itgav, Itgb1, Itgb3, Itgb4, Itgb5 and Itga6 and in EE cells showed significantly higher transcriptional levels than the other integrin subunits. Furthermore, translational expression of the total integrin α and β subunit genes that showed increased transcription was determined in ES and EE cells. ES cells showed significantly increased adhesion to collagen I, fibronectin and vitronectin, and functional blocking of integrin α2 , α5 or αV significantly inhibited adhesion to these molecules. Moreover, EE cells showed significantly increased adhesion to collagen I, fibronectin, laminin and vitronectin, and functional blocking of integrin α2 , α5 , α6 or αV significantly inhibited adhesion to these molecules. Accordingly, we confirmed that integrin α2 β1 , α5 β1 , αV β1 , αV β3 and/or αV β5 , and integrin α2 β1 , α5 β1 , α6 β1 and/or α6 β4 , αV β1 , αV β3 and/or αV β5 , actively function on the surface of ES and EE cells from mouse uterus in estrus phase, respectively.

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