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• W1997435596 abstract "Proteins encoded by the epidermal growth factor receptor (EGFR/HER1/ERBB1) gene are being studied as diagnostic, prognostic, and theragnostic biomarkers for numerous human cancers. The clinical application of these tissue/tumor biomarkers has been limited, in part, by discordant results observed for epidermal growth factor receptor (EGFR) expression using different immunological reagents. Previous studies have used EGFR-directed antibodies that cannot distinguish between full-length and soluble EGFR (sEGFR) expression. We have generated and characterized an anti-sEGFR polyclonal antiserum directed against a 31-mer peptide (residues 604-634) located within the unique 78-amino acid carboxy-terminal sequence of sEGFR. Here, we use this antibody to demonstrate that sEGFR is coexpressed with EGFR in a number of carcinoma-derived cell lines. In addition, we show that a second protein of ~140 kDa (p140) also is detected by this antibody. Rigorous biochemical characterization identifies this second protein to be α5-integrin. We show that a 26-amino acid peptide in the calf domain of α5-integrin (residues 710-735) is 35% identical in sequence with a 31-mer carboxy-terminal sEGFR peptide and exhibits an approximately 5-fold lower affinity for anti-sEGFR than the homologous 31-mer sEGFR peptide does. We conclude that the carboxy terminus of sEGFR and the calf-1 domain of α5-integrin share a region of sequence identity, which results in their mutual immunological reactivity with anti-sEGFR. We also demonstrate that anti-sEGFR promotes three-dimensional tissue cohesion and compaction in vitro, further suggesting a functional link between sEGFR and α5-integrin and a role of the calf-1 domain in cell adhesion. These results have implications for the study of both EGFR and sEGFR as cancer biomarkers and also provide new insight into the mechanisms of interaction between cell surface EGFR isoforms and integrins in complex processes such as cell adhesion and survival signaling." @default.
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• W1997435596 date "2011-04-27" @default.
• W1997435596 modified "2023-10-16" @default.
• W1997435596 title "Identification of Immunoreactive Regions of Homology between Soluble Epidermal Growth Factor Receptor and α5-Integrin" @default.
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• W1997435596 doi "https://doi.org/10.1021/bi200126j" @default.
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