Therapeutic efficiency of essential oils against Helicobacter pylori infections

Helicobacter pylori, a Gram-negative bacterium found in the stomach, is the cause of more than 90% of duodenal and 80% of gastric ulcers, and the major risk factor for gastric carcinoma and primary gastric lymphoma. Antibiotic therapy for treating H. pylori infections, the only available in current medical practice, has multiple disadvantages: lack of efficacy, development of resistance, adverse effects, and possible recurrence of the disease. Furthermore, the treatment is often associated with gastrointestinal side effects [1]. Consequently, there is a growing interest in the development of new antimicrobial therapeutic agents, more efficient against H. pylori, preferably of natural origin. Good candidates for that purpose are the volatile compounds present in essential oils. Due to the complexity of their composition, bacteria rarely develop resistance toward them [2]. Here, we reported the results of the efficacy of various essential oils, and their mixtures, against H. pylori. The highest in vitro activity was shown by Satureja hortensis, Origanum vulgare subsp. vulgare and O. vulgare subsp. hirtum essential oils. Furthermore, their binary and ternary mixtures exhibited notably higher antimicrobial activities [3]. The activity of the binary mixture of S. hortensis and O. vulgare subsp. hirtum essential oils (2MIX) was confirmed by an in vivo study in a mouse model, where changes in H. pylori colonization were detected by PCR and histological analyses of gastric samples. Furthermore, 2MIX show neither in vitro nor in vivo toxicity and do not have any immunomodulatory or allergic effect [4]