Abstract
Background
Serotonin (5-HT) release and serotonin reuptake transporter (5-HTT) expression have been reported to be decreased in experimental colitis, in interleukin-10 knockout-associated colitis, and in patients with ulcerative colitis. Serotonin is known to play an important role in the pathogenesis of colitis, but individual genetic variants of 5-HTT gene in microscopic colitis and ulcerative colitis are not known.
Aim
This study aimed to evaluate the association between the serotonin transporter gene promoter polymorphism (5-HTTLPR) and 5-HT concentration in microscopic colitis (MC) and ulcerative colitis (UC) patients.
Method
This prospective case–control study included 41 patients with microscopic colitis (age 19–82 years, mean 35 ± 13.6), 75 patients with ulcerative colitis (age 16–65 years, mean 38.5 ± 11.6), and 100 controls (age 20–64 years, mean 38 ± 11). 5-HTTLPR gene polymorphism was studied by polymerase chain reaction-based assay. 5-HT levels were measured by ELISA.
Results
The frequency of the 5-HTTLPR (SS) genotype was significantly lower in MC (12 %) patients compared to controls (30 %) (p < 0.05). When the L/L and L/S genotypes were combined into one group, the frequencies of the non-S genotype were significantly higher than those of S/S genotype between the MC patients and the controls (p < 0.05). 5-HT levels were significantly higher in UC and MC patients compared to healthy controls (p < 0.01).
Conclusions
A significant association was observed between LL genotype of 5-HTTLPR polymorphism and microscopic colitis, suggesting that 5-HTTLPR is a potential candidate gene involved in the pathogenesis of microscopic colitis. Serotonin levels were significantly higher in microscopic colitis and ulcerative colitis patients compared to healthy controls.


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Sikander, A., Sinha, S.K., Prasad, K.K. et al. Association of Serotonin Transporter Promoter Polymorphism (5-HTTLPR) with Microscopic Colitis and Ulcerative Colitis. Dig Dis Sci 60, 887–894 (2015). https://doi.org/10.1007/s10620-014-3482-y
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DOI: https://doi.org/10.1007/s10620-014-3482-y