Deoxycholic Acid-Mediated Sphingosine-1-Phosphate Receptor 2 Signaling Exacerbates DSS-Induced Colitis through Promoting Cathepsin B Release

<div>DCA administration exacerbates DSS-induced colitis and inhibition of cathepsin B release reverses the intestinal inflammation. Colitis was induced in mice with 2.5% DSS and animals were divided into control, DSS-treated, DSS-treated plus DCA enema, DSS-treated plus DCA enema, and cathepsin B inhibitor (Ca-074Me)-injection groups. (a) Loss of basal body weight, (b) colon length, (c) hematochezia score, and (d) MPO activity in colon tissue were detected. (e) Immunoblot analysis of mature IL-1<i>β</i> (17kD) in colonic homogenates. 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DSS-treated alone mice. <sup>#</sup><sup>#</sup><svg height="11.7782pt" id="M26" style="vertical-align:-3.42938pt" version="1.1" viewbox="-0.0498162 -8.34882 44.5261 11.7782" width="44.5261pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M570 304C570 398 525 448 414 448C385 448 343 445 312 434L329 511L321 518C297 504 262 482 244 460L233 411C195 397 159 381 128 358L135 332C160 347 189 360 224 373L111 -147C97 -210 84 -218 17 -231L13 -257L254 -247L259 -218L233 -216C183 -212 177 -202 189 -142L218 -1C238 -10 266 -12 283 -12C351 3 429 48 483 105C543 168 570 242 570 304ZM482 289C482 161 380 33 304 33C278 33 248 51 233 69L303 396C326 400 352 403 369 403C428 403 482 380 482 289Z" id="g113-113"></path></g><g transform="matrix(.013,0,0,-0.013,11.342,0)"><path d="M512 -3V55L134 254V256L512 456V514L75 281V230L512 -3Z" id="g117-91"></path></g><g transform="matrix(.013,0,0,-0.013,22.605,0)"><path d="M241 635C89 635 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id="g113-50"></path></g></svg> compared to the DSS-treated plus DCA enema mice. Error bars indicate s.e.m. The data shown are from 3 individual experiments.</div>

Journal of Immunology Research

fig4

Figure 4

Figure 4: Deoxycholic Acid-Mediated Sphingosine-1-Phosphate Receptor 2 Signaling Exacerbates DSS-Induced Colitis through Promoting Cathepsin B Release 

Figure 4 | Deoxycholic Acid-Mediated Sphingosine-1-Phosphate Receptor 2 Signaling Exacerbates DSS-Induced Colitis through Promoting Cathepsin B Release 