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- W2103305423 startingPage "R104" @default.
- W2103305423 abstract "The purpose of this study was to determine whether supernatants of cultured human oral keratinocytes (HOK) exposed to an aqueous extract of smokeless tobacco (STE) increase macromolecular efflux from the oral mucosa in vivo and, if so, whether bradykinin mediates in part this response. Subconfluent monolayers of HOK were incubated with STE or media, and supernatants were collected 24, 48, and 72 h thereafter. Using intravital microscopy, we found that suffusion of supernatants of STE- but not media-exposed HOK elicited significant concentration- and time-dependent increases in efflux of fluorescein isothiocyanate-labeled dextran (mol mass 70 kDa) from the in situ hamster cheek pouch (P < 0.05). These effects were significantly attenuated by HOE-140 and NPC-17647 but not by des-Arg9, [Leu8]-bradykinin. Proteolytic activity was increased in supernatants of STE- but not media-exposed HOK. However, a mixture of leupeptin, Bestatin, and DL-2-mercaptomethyl-3-guanidinoethylthiopropanoic acid had no significant effects on HOK supernatant-induced responses. Collectively, these data suggest that oral keratinocytes modulate smokeless tobacco-induced increase in macromolecular efflux from the in situ oral mucosa in part by elaborating proteases that may account for local bradykinin production." @default.
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- W2103305423 date "1998-01-01" @default.
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- W2103305423 title "Smokeless tobacco-exposed oral keratinocytes increase macromolecular efflux from the in situ oral mucosa" @default.
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- W2103305423 doi "https://doi.org/10.1152/ajpregu.1998.274.1.r104" @default.
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