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- Title
Pilot study of Biomarkers for predicting effectiveness of ramosetron in diarrhea-predominant irritable bowel syndrome: expression of S100A10 and polymorphisms of TPH1.
- Authors
Shiotani, A.; Kusunoki, H.; Ishii, M.; Imamura, H.; Manabe, N.; Kamada, T.; Hata, J.; Merchant, J. L.; Haruma, K.
- Abstract
Background Serotonin type 3 receptor (5- HT3R) antagonists are potentially useful therapeutic agents for diarrhea-predominant irritable bowel syndrome ( IBS-D). To identify biomarkers predicting effectiveness of the 5- HT3R antagonist (ramosetron) in IBS-D. Methods Irritable bowel syndrome-D Japanese subjects received 2.5 or 5 μg of ramosetron once daily for 4 weeks. Colonic mucosal S100A and tryptophan hydroxylase ( TPH) mRNA expression levels were measured before treatment. Genomic DNA was extracted from blood and polymorphisms of TPH1 and TPH2 were analyzed. Key Results Forty-two patients (27 men and 15 women, mean age 42 years) with IBS-D were included for analysis. Improvement of IBS symptoms was seen in 26 (61.9%). Baseline S100A10 ( p = 0.02) and TPH1 ( p = 0.02) expression were significantly higher in the ramosetron responders than in the non-responders. The frequencies of the TPH1 rs4537731G allele in linkage disequilibrium with the TPH1 rs7130929 T allele (11.5% vs 50%, p = 0.003; OR: 12; 95% CI: 2.1-69) along with TPH1 rs211105 C allele (3.8% vs 43.8%, p = 0.0003; OR: 19; 95% CI: 2.1-181) were significantly lower in the responders than in the non-responders. The mean scores of diarrhea at baseline were significantly higher (5.2 vs 3.7, p = 0.005) in patients with TPH1 rs211105 T/T than those with the G allele. Conclusions & Inferences TPH1 gene polymorphisms and S100A10 expression, which correlate with 5- HT signaling were associated with ramosetron effectiveness in IBS-D, and may possibly lead to prospective identification of the resistance to treatment.
- Subjects
BIOMARKERS; SEROTONIN antagonists; DIARRHEA; THERAPEUTICS; IRRITABLE colon treatment; TRYPTOPHAN hydroxylase; MESSENGER RNA
- Publication
Neurogastroenterology & Motility, 2015, Vol 27, Issue 1, p82
- ISSN
1350-1925
- Publication type
Article
- DOI
10.1111/nmo.12473