Clinical Gastroenterology H: 克罗恩病患者的血清7α-羟基-4-胆甾烯-3-酮浓度与胆汁酸腹泻有关

2019-11-28 不详 MedSci原创

患有克罗恩病(CD)的患者通常由于回肠切除(IR)后胆汁酸吸收不良而导致胆汁酸腹泻(BAD)。胆汁酸吸收不良会增加胆汁酸前体7α-羟基-4-胆甾烯-3-酮(C4)的产生。本项研究调查了CD患者血清C4和BAD浓度之间的关系。

背景与目标
患有克罗恩病(CD)的患者通常由于回肠切除(IR)后胆汁酸吸收不良而导致胆汁酸腹泻(BAD)。胆汁酸吸收不良会增加胆汁酸前体7α-羟基-4-胆甾烯-3-酮(C4)的产生。本项研究调查了CD患者血清C4和BAD浓度之间的关系。

方法
研究人员收集了26例患行IR的CD患者、21例没有IR的CD的患者以及37例溃疡性结肠炎(UC)患者的人口统计学数据,血清样本以及有关腹泻(> 3次液体排便/天)以及临床,内镜和组织学评分的信息。研究人员比较了两组之间的血清C4和成纤维细胞生长因子19(FGF19)浓度。最后进行接受者工作特征曲线(AUROC)的计算分析面积分析,以鉴定诊断胆汁酸吸收不良(BAD)引起的腹泻的最佳临界C4浓度,和FGF19 <60 pg / mL的血清浓度。

结果
UC患者的血清C4浓度中位数为11.8 ng / mL,而患有回肠炎的CD和IR患者(内窥镜检查)的中位血清浓度为100.0 ng / mL(P<0.0001)、行IR的CD患者无回肠炎的IR的中位浓度为51.6 ng / mL(P相比UC <.001)。不考虑回肠炎的患者,无IR的CD患者的C4中位数浓度没有显着高于UC患者(P= 0.71)(P= 0.34)。活动性UC患者中有较高比例的腹泻(72.0%vs.0%;P<.001),但其C4的中值浓度与无活动性UC的患者相比无显着差异(12.1 ng / mL VS 9.7 ng / mL;P=0.3)。C4的临界浓度为48.3 ng/mL或更高,可鉴定出由于胆汁酸吸收不良而引起的腹泻患者,敏感性为90.9%,特异性为84.4%,AUROC为0.94。C4浓度高于此临界值的患者中BAD(50.0%)的比例明显高于低于此临界值(1.8%)的患者的比例(P<.001)。当我们仅分析腹泻患者时,C4截断值为48.3 ng / mL,可确定那些FGF19浓度低(<60 pg / mL),敏感性为91%,特异性为95.5%(AUROC,0.99)的患者。

结论
与UC患者相比,研究人员发现行IR的CD患者的C4血清浓度显着增加。C4的临界浓度高于48.3 ng / mL,表明腹泻患者可能归因胆汁酸吸收不良(BAD)。胆汁酸前体的血清水平升高可确定腹泻和FGF19血清浓度低的患者,C4可能是鉴定胆汁酸吸收不良所致腹泻患者的生物标志物。

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    2020-09-03 许安
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    2019-11-30 zll0628
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