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BioMed Research International
Volume 2013 (2013), Article ID 845032, 7 pages
Clinical Study

Expression of Melatonin Synthesizing Enzymes in Helicobacter pylori Infected Gastric Mucosa

1Department of Gastroenterology, Medical University of Lodz, 1 Haller’s Square, 90-647 Lodz, Poland
2Department of Molecular Genetics, Faculty of Biology and Environmental Protection, University of Lodz, Pomorska 141/143, 90-236 Lodz, Poland
3Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, TX 78229-3900, USA
4Department of Clinical Nutrition, Medical University of Lodz, 1 Haller’s Square, 90-647 Lodz, Poland

Received 15 April 2013; Revised 29 May 2013; Accepted 19 June 2013

Academic Editor: Toshifumi Ohkusa

Copyright © 2013 Cezary Chojnacki et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Helicobacter pylori colonization of gastric mucosa causes pain of unknown etiology in about 15–20% of infected subjects. The aim of the present work was to determine the level of expression of enzymes involved in the synthesis of melatonin in gastric mucosa of asymptomatic and symptomatic H. pylori infected patients. To diagnose H. pylori infection, histological analysis and the urea breath test (UBT C13) were performed. The levels of mRNA expression of arylalkylamine-N-acetyltransferase (AA-NAT) and acetylserotonin methyltransferase (ASMT) were estimated in gastric mucosa with RT-PCR. The level of AA-NAT expression and AMST was decreased in H. pylori infected patients and was increased after H. pylori eradication. We conclude that decreased expression of melatonin synthesizing enzymes, AA-NAT and ASMT, in patients with symptomatic H. pylori infection returns to normal level after H. pylori eradication.