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Aliment Pharmacol Ther. 2019 Feb 7. doi: 10.1111/apt.15159. [Epub ahead of print]

Circulating microRNA146b-5p is superior to C-reactive protein as a novel biomarker for monitoring inflammatory bowel disease.

Author information

1
Division of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, P.R. China.
2
Division of Gastroenterology, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, P.R. China.
3
Division of Gastroenterology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, P.R. China.

Abstract

BACKGROUND:

Owing to the importance of early treatment, simple and reliable methods for monitoring inflammatory bowel disease (IBD) are needed.

AIMS:

To determine whether circulating microRNAs are reliable biomarkers for IBD monitoring.

METHODS:

Serum levels of 17 candidate microRNAs were measured by quantitative real-time polymerase chain reaction in a discovery cohort (n = 120). Differentially expressed serum microRNAs were further investigated in an independent training cohort (n = 341). Correlations between relative microRNA levels and disease activity were evaluated. A disease control group was included to investigate the specificity of microRNA. Logistical regression was used to construct a microRNA classifier to identify endoscopic activity. Its predictive value was explored in the validation cohort (n = 66) using the area under the receiver operating characteristic curve (AUC).

RESULTS:

Serum microRNA146b-5p (miR-146b-5p) expression was 2.87- and 2.72-fold higher in patients with Crohn's disease and ulcerative colitis, respectively, than in healthy controls. Serum miR-146b-5p was significantly correlated with disease activity and was more specific than C-reactive protein (CRP). A classifier was built for Crohn's disease, ie P [Endoscopically active] = 1 1 + e 2.937 - 0.737 ( m i R - 146 b - 5 p ) - 0.008 P L T , with a greater AUC of 0.869 [0.764-0.940] than that for CRP (0.680 [0.554-0.790]) (P = 0.0043).

CONCLUSIONS:

MiR-146b-5p may better reflect mucosal inflammation in IBD than CRP. The Crohn's disease classifier developed in this study may be valuable for identifying endoscopic activity in patients with Crohn's disease.

KEYWORDS:

circulating biomarker; inflammatory bowel disease; microRNA classifier; microRNA-146b-5p

PMID:
30734320
DOI:
10.1111/apt.15159

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