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Lee S, Kim TW, Lee YH, Kang DM, Ryoo R, Ko YJ, Ahn MJ, Kim KH. Two New Fatty Acid Derivatives, Omphalotols A and B and Anti-Helicobacterpylori Fatty Acid Derivatives from Poisonous Mushroom Omphalotus japonicus. Pharmaceuticals (Basel) 2022; 15:ph15020139. [PMID: 35215253 PMCID: PMC8874359 DOI: 10.3390/ph15020139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 01/22/2023] Open
Abstract
As part of ongoing systematic research into the discovery of bioactive secondary metabolites with novel structures from Korean wild mushrooms, we investigated secondary metabolites from a poisonous mushroom, Omphalotus japonicus (Kawam.) Kirchm. & O. K. Mill. belonging to the family Marasmiaceae, which causes nausea and vomiting after consumption. The methanolic extract of O. japonicus fruiting bodies was subjected to the fractionation by solvent partition, and the CH2Cl2 fraction was analyzed for the isolation of bioactive compounds, aided by an untargeted liquid chromatography mass spectrometry (LC–MS)-based analysis. Through chemical analysis, five fatty acid derivatives (1–5), including two new fatty acid derivatives, omphalotols A and B (1 and 2), were isolated from the CH2Cl2 fraction, and the chemical structures of the new compounds were determined using 1D and 2D nuclear magnetic resonance (NMR) spectroscopy and high resolution electrospray ionization mass spectrometry (HR-ESIMS), as well as fragmentation patterns in MS/MS data and chemical reactions followed by the application of Snatzke’s method and competing enantioselective acylation (CEA). In the anti-Helicobacter pylori activity test, compound 1 showed moderate antibacterial activity against H. pylori strain 51 with 27.4% inhibition, comparable to that of quercetin as a positive control. Specifically, compound 3 exhibited the most significant antibacterial activity against H. pylori strain 51, with MIC50 and MIC90 values of 9 and 20 μM, respectively, which is stronger inhibitory activity than that of another positive control, metronidazole (MIC50 = 17 μM and MIC90 = 46 μM). These findings suggested the experimental evidence that the compound 3, an α,β-unsaturated ketone derivative, could be used as a moiety in the development of novel antibiotics against H. pylori.
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Affiliation(s)
- Seulah Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
- Division of Life Sciences, Korea Polar Research Institute, KIOST, Incheon 21990, Korea
| | - Tae Wan Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
| | - Yong Hoon Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
| | - Dong-Min Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, Korea; (D.-M.K.); (M.-J.A.)
| | - Rhim Ryoo
- Special Forest Products Division, Forest Bioresources Department, National Institute of Forest Science, Suwon 16631, Korea;
| | - Yoon-Joo Ko
- Laboratory of Nuclear Magnetic Resonance, National Center for Inter-University Research Facilities (NCIRF), Seoul National University, Gwanak-gu, Seoul 08826, Korea;
| | - Mi-Jeong Ahn
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, Korea; (D.-M.K.); (M.-J.A.)
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
- Correspondence: ; Tel.: +82-31-290-7700
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APRIL-producing eosinophils are involved in gastric MALT lymphomagenesis induced by Helicobacter sp infection. Sci Rep 2020; 10:14858. [PMID: 32908188 PMCID: PMC7481773 DOI: 10.1038/s41598-020-71792-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 08/03/2020] [Indexed: 12/17/2022] Open
Abstract
The roles of the inflammatory response and production of a proliferation-inducing ligand (APRIL) cytokine in gastric mucosa-associated lymphoid tissue (MALT) lymphomagenesis induced by Helicobacter species infection are not clearly understood. We characterized the gastric mucosal inflammatory response associated with gastric MALT lymphoma (GML) and identified APRIL-producing cells in two model systems: an APRIL transgenic mouse model of GML induced by Helicobacter infection (Tg-hAPRIL) and human gastric biopsy samples from Helicobacter pylori-infected GML patients. In the mouse model, polarization of T helper 1 (tbet), T helper 2 (gata3), and regulatory T cell (foxp3) responses was evaluated by quantitative PCR. In humans, a significant increase in april gene expression was observed in GML compared to gastritis. APRIL-producing cells were eosinophilic polynuclear cells located within lymphoid infiltrates, and tumoral B lymphocytes were targeted by APRIL. Together, the results of this study demonstrate that the Treg-balanced inflammatory environment is important for gastric lymphomagenesis induced by Helicobacter species, and suggest the pro-tumorigenic potential of APRIL-producing eosinophils.
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Blosse A, Levy M, Robe C, Staedel C, Copie-Bergman C, Lehours P. Deregulation of miRNA in Helicobacter pylori-Induced Gastric MALT Lymphoma: From Mice to Human. J Clin Med 2019; 8:jcm8060845. [PMID: 31200531 PMCID: PMC6616415 DOI: 10.3390/jcm8060845] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 06/05/2019] [Accepted: 06/06/2019] [Indexed: 12/12/2022] Open
Abstract
Gastric MALT lymphoma (GML) is directly caused by Helicobacter pylori infection but occurs only in a small number of infected subjects. Mechanisms underlying the initiation and progression of GML remain unclear. MicroRNAs (miRNAs) are small non-coding RNAs that are now considered as major players in inflammation and carcinogenesis, acting as oncogenes or tumor suppressors. Previous laboratory studies have shown in a GML mouse model that overexpression of a distinct set of five miRNAs (miR-21a, miR-135b, miR-142a, miR-150, miR-155) could play a critical role in the pathogenesis of GML. Our goal was to compare the miRNA expression profile obtained in the GML mouse model to that in human GML (11 cases of GML compared to 17 cases of gastritis control population). RTqPCR on the five dysregulated miRNAs in the GML mouse model and PCR array followed by RTqPCR confirmation showed that four miRNAs were up-regulated (miR-150, miR-155, miR-196a, miR-138) and two miRNAs down-regulated (miR-153, miR-7) in the stomachs of GML patients vs. gastritis control population. The analysis of their validated targets allowed us to postulate that these miRNAs (except miR-138) could act synergistically in a common signaling cascade promoting lymphomagenesis and could be involved in the pathogenesis of GML.
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Affiliation(s)
- Alice Blosse
- INSERM, Université Bordeaux, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, 33000 Bordeaux, France.
| | - Michael Levy
- EC2M3: Department of Academic Research (EA7375), Université Paris Est Créteil (UPEC), Val de Marne, 94000 Créteil, France.
- Department of Gastroenterology, Henri Mondor Hospital, APHP, 94000 Créteil, France.
| | | | - Cathy Staedel
- INSERM U1212, ARNA Laboratory, Université de Bordeaux, 33000 Bordeaux, France.
| | - Christiane Copie-Bergman
- Department of Pathology, Henri Mondor Hospital, APHP, INSERM U955, Equipe 9, Université Paris-Est, 94000 Créteil, France.
| | - Philippe Lehours
- INSERM, Université Bordeaux, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, 33000 Bordeaux, France.
- French National Reference Center for Campylobacters & Helicobacters, 33000 Bordeaux, France.
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Khalil AAK, Park WS, Lee J, Kim HJ, Akter KM, Goo YM, Bae JY, Chun MS, Kim JH, Ahn MJ. A new anti-Helicobacter pylori juglone from Reynoutria japonica. Arch Pharm Res 2019; 42:505-511. [PMID: 31073878 DOI: 10.1007/s12272-019-01160-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 04/25/2019] [Indexed: 12/11/2022]
Abstract
A 70% ethanol extract from the root portion of Reynoutria japonica afforded one new and three known juglone derivatives, namely, 2-methoxy-6-acetyl-7-methyljuglone (1), 2-ethoxy-6-acetyl-7-methyljuglone (2), 2-methoxy-7-acetonyljuglone (3), and 3-acetyl-7-methoxy-2-methyljuglone (4) together with two phenolics (5 and 6), an anthraquinone (7), a stilbene (8) and a phthalide (9). Their structures were elucidated on the basis of comprehensive spectroscopic studies including IR, MS, and 1H, 13C, 2D NMR spectra. Compound 3 is a new compound in nature, and compounds 4-6 have been isolated for the first time from R. japonica. The isolates were evaluated for their antibacterial activity against three strains (43504, 51, and 26695) of Helicobacter pylori. The four isolated juglone derivatives (1-4) showed potent growth inhibitory activity. Among them, compounds 1-3 exhibited stronger inhibitory activity than those of the positive controls, juglone and metronidazole, for the three strains and that of another reference, clarithromycin, for the 43504 and 51 strains. Specifically, the new juglone compound 3 displayed the most potent antibacterial activity against all three strains, 43504, 51, and 26695, with MIC values of 0.06, 0.06 and 0.13 μM, respectively, and MIC50 values of 0.14, 0.11 and 0.15 μM, respectively.
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Affiliation(s)
- Atif Ali Khan Khalil
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea
| | - Woo Sung Park
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea
| | - Jeehoon Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea
| | - Hye-Jin Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea
| | - Kazi-Marjahan Akter
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea
| | - Young-Min Goo
- Gyeongnam Oriental Anti-aging Institute, Sancheong, Gyeongnam, 52215, South Korea
| | - Ji-Yeong Bae
- National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, Oxford, MS, 38677, USA
| | - Man-Seog Chun
- Korea Science Academy of KAIST, Busan, 47162, South Korea
| | - Jung-Hwan Kim
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52727, South Korea
| | - Mi-Jeong Ahn
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea.
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Rentien AL, Lévy M, Copie-Bergman C, Gagniere C, Dupuis J, Le Baleur Y, Belhadj K, Sobhani I, Haioun C, Delchier JC, Amiot A. Long-term course of precancerous lesions arising in patients with gastric MALT lymphoma. Dig Liver Dis 2018; 50:181-188. [PMID: 29102522 DOI: 10.1016/j.dld.2017.10.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/11/2017] [Accepted: 10/13/2017] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIMS To evaluate the prevalence and the long-term course of gastric precancerous lesions in patients with GML. PATIENTS AND METHODS In this retrospective single-centre study, we included 179 patients with GML, 70 with gastric diffuse large B-cell lymphoma (GDLBCL) and 152 with Helicobacter pylori-associated gastritis (HpG), from January 1995 to January 2014. The presence of atrophic gastritis, intestinal metaplasia and neoplastic lesion has been assessed at baseline and during follow-up. RESULTS Atrophic gastritis was more frequent in the GML group whereas there was also a trend for intestinal metaplasia and gastric dysplasia. In patients with GML, atrophic gastritis, intestinal metaplasia and gastric dysplasia were more frequent in the GML area than in other part of the stomach. During follow-up, the prevalence of atrophic gastritis remained stable overtime whereas intestinal metaplasia and dysplasia tend to increase overtime. In multivariate analysis, the occurrence of dysplasia or carcinoma was associated with the presence of intestinal metaplasia at baseline and male gender. CONCLUSION GML is associated with gastric precancerous lesion to a higher extent than GDLBCL and HpG. Those precancerous lesions do not regress despite achievement of complete remission of GML and tend to increase overtime.
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Affiliation(s)
- Anne-Laure Rentien
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France; Paris Est-Creteil University (UPEC), Creteil F-94010, France; EC2M3-EA7375 Unit, Creteil, France
| | - Michaël Lévy
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France
| | - Christiane Copie-Bergman
- Paris Est-Creteil University (UPEC), Creteil F-94010, France; Department of Pathology, Henri Mondor University Hospital, APHP, Creteil F-94010, France; Unit UMR-S 955, INSERM, Creteil F-94010, France
| | - Charlotte Gagniere
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France; Paris Est-Creteil University (UPEC), Creteil F-94010, France; EC2M3-EA7375 Unit, Creteil, France
| | - Jehan Dupuis
- Lymphoid Malignancies Unit, Henri Mondor University Hospital, APHP, Creteil F-94010, France
| | - Yann Le Baleur
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France
| | - Karim Belhadj
- Lymphoid Malignancies Unit, Henri Mondor University Hospital, APHP, Creteil F-94010, France
| | - Iradj Sobhani
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France
| | - Corinne Haioun
- Paris Est-Creteil University (UPEC), Creteil F-94010, France; Unit UMR-S 955, INSERM, Creteil F-94010, France; Lymphoid Malignancies Unit, Henri Mondor University Hospital, APHP, Creteil F-94010, France
| | - Jean-Charles Delchier
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France; Paris Est-Creteil University (UPEC), Creteil F-94010, France
| | - Aurelien Amiot
- Department of Gastroenterology, Henri Mondor University Hospital, APHP, Creteil F-94010, France; Paris Est-Creteil University (UPEC), Creteil F-94010, France; EC2M3-EA7375 Unit, Creteil, France.
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Helicobacter pylori from Peptic Ulcer Patients in Uganda Is Highly Resistant to Clarithromycin and Fluoroquinolones: Results of the GenoType HelicoDR Test Directly Applied on Stool. BIOMED RESEARCH INTERNATIONAL 2017; 2017:5430723. [PMID: 28555193 PMCID: PMC5438841 DOI: 10.1155/2017/5430723] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 01/13/2017] [Accepted: 02/13/2017] [Indexed: 02/06/2023]
Abstract
Background Around 70–90% of peptic ulcer disease (PUD) is due to Helicobacter pylori and requires treatment with antimicrobials to which these bacteria are susceptible. Common H. pylori diagnostic tests do not provide drug susceptibility data. Using the GenoType HelicoDR PCR test designed for gastric biopsies for simultaneous detection of H. pylori and its resistance to clarithromycin (CLA)/fluoroquinolones (FLQ), we present evidence for stool as an optional test specimen and also provide data on prevalence of H. pylori resistance to CLA and FLQ in Uganda. Methods Stool from 142 symptomatic PUD patients at three hospitals in Kampala was screened for H. pylori using a rapid antigen test. The GenoType HelicoDR test was run on all H. pylori antigen positives to determine PCR positivity and resistance to CLA/FLQ. Results Thirty-one samples (22%) were H. pylori antigen positive, and 21 (68%) of these were H. pylori PCR positive. Six of the 21 (29%) were resistant to CLA and eight to FLQ (42%), while two gave invalid FLQ resistance results. Conclusion Stool is a possible specimen for the GenoType HelicoDR test for rapid detection of H. pylori and drug resistance. In Uganda, Helicobacter pylori is highly resistant to CLA and FLQ.
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Amiot A, Jooste V, Gagniere C, Lévy M, Copie-Bergman C, Dupuis J, Le Baleur Y, Belhadj K, Sobhani I, Haioun C, Bouvier AM, Delchier JC. Second primary malignancies in patients treated for gastric mucosa-associated lymphoid tissue lymphoma. Leuk Lymphoma 2017; 58:1-11. [DOI: 10.1080/10428194.2017.1283033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Aurelien Amiot
- Department of Gastroenterology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
- Faculté de Médecine, Université Paris Est-Creteil (UPEC), Creteil, France
- EC2M3-EA7375 unit, Creteil, France
| | - Valerie Jooste
- Digestive Cancer Registry of Burgundy, University Hospital of Dijon, University of Burgundy, INSERM, U866, Dijon, France
| | - Charlotte Gagniere
- Department of Gastroenterology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
- Faculté de Médecine, Université Paris Est-Creteil (UPEC), Creteil, France
- EC2M3-EA7375 unit, Creteil, France
| | - Michaël Lévy
- Department of Gastroenterology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
| | - Christiane Copie-Bergman
- Faculté de Médecine, Université Paris Est-Creteil (UPEC), Creteil, France
- Department of Pathology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
- Unit UMR-S 955, INSERM, Creteil, France
| | - Jehan Dupuis
- Lymphoid Malignancies Unit, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
| | - Yann Le Baleur
- Department of Gastroenterology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
| | - Karim Belhadj
- Lymphoid Malignancies Unit, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
| | - Iradj Sobhani
- Department of Gastroenterology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
| | - Corinne Haioun
- Faculté de Médecine, Université Paris Est-Creteil (UPEC), Creteil, France
- Unit UMR-S 955, INSERM, Creteil, France
- Lymphoid Malignancies Unit, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
| | - Anne-Marie Bouvier
- Digestive Cancer Registry of Burgundy, University Hospital of Dijon, University of Burgundy, INSERM, U866, Dijon, France
| | - Jean-Charles Delchier
- Department of Gastroenterology, Groupe Hospitalier Henri Mondor-Albert Chennevier, APHP, Creteil, France
- Faculté de Médecine, Université Paris Est-Creteil (UPEC), Creteil, France
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Amiot A, Lévy M, Copie-Bergman C, Dupuis J, Szablewski V, Le Baleur Y, Baia M, Belhadj K, Sobhani I, Leroy K, Haioun C, Delchier JC. Rituximab, alkylating agents or combination therapy for gastric mucosa-associated lymphoid tissue lymphoma: a monocentric non-randomised observational study. Aliment Pharmacol Ther 2014; 39:619-28. [PMID: 24467480 DOI: 10.1111/apt.12635] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 12/14/2013] [Accepted: 01/06/2014] [Indexed: 12/18/2022]
Abstract
BACKGROUND There is no consensus on the standard treatment of gastric mucosa-associated lymphoid tissue (MALT) lymphoma for Helicobacter pylori-negative patients and for patients with persistent disease despite H. pylori eradication. AIM To evaluate the comparative efficacy and safety of alkylating agents and rituximab alone or in combination. METHODS In this monocentric retrospective study, which included 106 patients who had not been previously treated with anti-cancer agents, we evaluated the efficacy and safety of oral alkylating agents monotherapy (n = 48), rituximab monotherapy (n = 28) and the therapy combining both drugs (n = 30). Evaluations were performed at weeks 6 (W6), 25 (W25), and 52 (W52) and after 2 years (W104). RESULTS After a median follow-up period of 4.9 years (range 0.4-17.2 years), complete remission and overall response were significantly higher in patients in the combination therapy group at W104 (92% and 100% respectively) compared with patients treated with alkylating agents alone (66% and 68%) and rituximab alone (64% and 73%). The 5-year progression-free survival probabilities were 68%, 70% and 89% in patients treated with alkylating agents alone, rituximab alone and combination therapy respectively. Haematological adverse events were reported in 32 (30%) patients (mostly grade 1) and were more frequent in the two groups receiving alkylating agents (P = 0.05 and P < 0.001). No toxicity-related death was reported. CONCLUSIONS The use of anti-cancer systemic therapy is safe and efficient in gastric MALT lymphoma. In this retrospective study, the combination of rituximab plus chlorambucil seems more efficient than rituximab or alkylating agents alone. Rituximab has a better safety profile than regimens containing alkylating agents.
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Affiliation(s)
- A Amiot
- Department of Gastroenterology, Albert Chenevier-Henri Mondor Hospital, Créteil, France; Department of Pathology, Albert Chenevier-Henri Mondor Hospital, Créteil, France; Lymphoid Malignancies Unit, Albert Chenevier-Henri Mondor Hospital, Créteil, France
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Abdollahi H, Savari M, Zahedi MJ, Moghadam SD, Hayatbakhsh Abasi M. Detection of A2142C, A2142G, and A2143G Mutations in 23s rRNA Gene Conferring Resistance to Clarithromycin among Helicobacter pylori Isolates in Kerman, Iran. IRANIAN JOURNAL OF MEDICAL SCIENCES 2013; 2:430-5. [PMID: 23359224 DOI: 10.1002/dta.162] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Clarithromycin resistance in Helicbacter pylori has been found to be associated with point mutations in 23s rRNA gene leads to reduced affinity of the antibiotic to its ribosomal target or changing the site of methylation. The aim of this study was to determine the most important point mutations in 23s rRNA gene in H. pylori that are closely related to clarithromycin resistance among such isolates. METHODS Sixty three H. pylori isolates, obtained from gastric biopsy speciemens in Kerman, Iran, were used to evaluate their susceptibility to clarithromycin by disk diffusion test, and to detect the most common point mutations in 23s rRNA gene associated with clarithromycin resistance by Polymerase chain reaction-amplification and restriction fragment length polymorphism (PCR-RFLP) and 3'-mismatch PCR. RESULTS 31.7% of the H. pylori isolates were resistant to clarithromycin, and each of the resistant isolate had at least one of the most common point mutations in 23s rRNA gene associated with calrithromycin resistance. CONCLUSION According to our results three common point mutation in 23s rRNA gene in H. pylori are closely related to clarithromycin resistance. There was an absolute relation between 23s rRNA gene point mutations and clarithromycin resistance in this study. Helicbacter pylori resistance to clarithromycin can cause failure in the eradications of the bacteria. The resistance of the bacteria is expanding in most parts of the world including Iran.
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Affiliation(s)
- Hamid Abdollahi
- Department of Medical Microbiology, Virology & Immunology, Kerman University of Medical Sciences, Kerman, Iran
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Chang CS, Liu JF, Lin HJ, Lin CD, Tang CH, Lu DY, Sing YT, Chen LY, Kao MC, Kuo SC, Lai CH. Synthesis and bioevaluation of novel 3,4,5-trimethoxybenzylbenzimidazole derivatives that inhibit Helicobacter pylori-induced pathogenesis in human gastric epithelial cells. Eur J Med Chem 2012; 48:244-54. [DOI: 10.1016/j.ejmech.2011.12.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 11/16/2011] [Accepted: 12/13/2011] [Indexed: 01/25/2023]
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Clarithromycin resistance and efficacy of clarithromycin-containing triple eradication therapy for Helicobacter pylori infection in type 2 diabetes mellitus patients. South Med J 2009; 102:1116-20. [PMID: 19864973 DOI: 10.1097/smj.0b013e3181bca538] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Antimicrobial resistance in Helicobacter pylori infection is an important factor leading to failure of therapy. The aim of this study was to determine the eradication rate of H pylori in type 2 diabetes mellitus and to assess the effect of clarithromycin resistance on H pylori eradication. METHOD Fifty-six consecutive patients with type 2 diabetes mellitus and 58 age- and sex-matched control patients were included in the study. H pylori infection was assessed by a rapid urease test and histopathological examination of biopsy specimens. Biopsies were also taken for antibiotic susceptibility testing. All enrolled patients were treated with triple therapy consisting of clarithromycin, amoxicillin, and pantoprazole for 14 days. C-13 urea breath test was performed 6 weeks after completing the triple therapy to assess eradication and associated point mutations using real-time polymerase chain reaction (PCR). RESULTS H pylori was eradicated in 42.9% of diabetic patients and 79.3% of control patients, (P < 0.05). In type 2 diabetes mellitus patients, clarithromycin resistance was 64.3% (36/56), while in the control group, clarithromycin resistance was 35.7% (20/58) (P < 0.05). H pylori was eradicated in 14 (70%) of the 20 clarithromycin-susceptible diabetic patients and in only 10 (27.8%) of the 36 clarithromycin-resistant diabetic patients. CONCLUSION The H pylori eradication rate was significantly lower and clarithromycin resistance was significantly higher in type 2 diabetics. Alternative and new treatment protocols and antibiotic susceptibility testing are needed to achieve successful eradication rates.
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Akyildiz M, Akay S, Musoglu A, Tuncyurek M, Aydin A. The efficacy of ranitidine bismuth citrate, amoxicillin and doxycycline or tetracycline regimens as a first line treatment for Helicobacter pylori eradication. Eur J Intern Med 2009; 20:53-7. [PMID: 19237093 DOI: 10.1016/j.ejim.2008.04.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2007] [Revised: 03/14/2008] [Accepted: 04/27/2008] [Indexed: 12/16/2022]
Abstract
BACKGROUND The eradication rates of Helicobacter pylori (H. pylori) clearly decreased with standard PPI-based triple therapies. AIM To assess the efficacy of two different triple therapies consisting of ranitidine bismuth citrate-amoxicillin-doxycycline and ranitidine bismuth citrate-amoxicillin-tetracycline combinations as a first line treatment option. METHODS One hundred and fifteen consecutive dyspeptic patients in whom H. pylori infection was diagnosed for the first time were enrolled in this study. The patients were randomized into two groups. Group 1 (n=57) was assigned to receive a 14-day triple therapy consisting of ranitidine bismuth citrate 400 mg (b.i.d.), amoxicillin 1 g (b.i.d) and doxycycline 100 mg (b.i.d.). Group 2 (n=58) was assigned to receive a 14-day triple therapy consisting of ranitidine bismuth citrate 400 mg (b.i.d.), amoxicillin 1 g (b.i.d.) and tetracycline 500 mg (q.i.d.). RESULTS The eradication was achieved in 45.7% (21/46) and 40.8% (20/49) of the patients in group 1 and group 2, according to per protocol analysis. The intention-to-treat eradication rates were 36.8% (21/57) and 34.5% (20/58) in group 1 and group 2, respectively. CONCLUSIONS Two-week therapy with neither ranitidine bismuth citrate-amoxicillin-doxycycline nor ranitidine bismuth citrate-amoxicillin-tetracycline is adequately effective for H. pylori eradication as a first line therapy.
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Affiliation(s)
- Murat Akyildiz
- Ege University Medical School, Department of Gastroenterology, Bornova, Izmir, Turkey.
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Furuta T, Soya Y, Sugimoto M, Shirai N, Nakamura A, Kodaira C, Nishino M, Okuda M, Okimoto T, Murakami K, Fujioka T, Hishida A. Modified allele-specific primer-polymerase chain reaction method for analysis of susceptibility of Helicobacter pylori strains to clarithromycin. J Gastroenterol Hepatol 2007; 22:1810-5. [PMID: 17914955 DOI: 10.1111/j.1440-1746.2007.04919.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND AND AIM Most clarithromycin-resistant strains of Helicobacter pylori have a mutation from adenine (A) to guanine (G) at position 2142 or 2143 of the 23S rRNA gene. Our aim in this study was to develop a polymerase chain reaction (PCR)-based assay that could determine these mutations in a single reaction tube. METHODS We designed the forward primer FP2143G and the reverse primer RP2142G, which specifically anneal with the 2143G- and 2142G-mutated sequences, respectively, of the 23S rRNA gene of H. pylori. We also designed the forward primer FP-1 and reverse primer RP-1 upstream and downstream from the positions 2142 and 2143, respectively, to distinguish the wild-type A2142G and A2143G mutations from each other by amplicon sizes. DNA was extracted from 292 gastric tissue samples positive for rapid urease test, and the DNA underwent the PCR reaction. The results were compared with minimum inhibitory concentrations (MIC) for clarithromycin. RESULTS Helicobacter pylori strains with A2142G, A2143G and wild type could be distinguished by amplicon sizes by a single PCR reaction. The genotyping results were correlated well with the MIC values for clarithromycin. The median MIC for clarithromycin of the wild-type strains was <0.015 microg/mL. Those of strains with 2142G or 2143G were > or =1.0 microg/mL. CONCLUSION Our new PCR-based assay for 23S rRNA mutations of H. pylori is a useful method for detecting clarithromycin-resistant strains of H. pylori easily.
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Affiliation(s)
- Takahisa Furuta
- Center for Clinical Research, Hamamatsu University School of Medicine, Hamamatsu, Japan.
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14
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Aydin A, Onder G, Akarca U, Tekin F, Tuncyurek M, Ilter T. Comparison of 1- and 2-week pantoprazole-based triple therapies in clarithromycin-sensitive and resistant cases. Eur J Intern Med 2007; 18:496-500. [PMID: 17822662 DOI: 10.1016/j.ejim.2007.02.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2006] [Revised: 11/25/2006] [Accepted: 02/09/2007] [Indexed: 12/15/2022]
Abstract
BACKGROUND The objectives of this prospective study were: (i) to compare the efficacy of 1-week with 2-week pantoprazole-based triple therapy and (ii) to evaluate the impact of clarithromycin resistance on Helicobacter pylori (H. pylori) eradication rates. METHODS Eighty dyspeptic patients were randomly allocated to two groups. The first group (PAC-1, n=40) received pantoprazole 40 mg, amoxicillin 1000 mg, and clarithromycin 500 mg twice a day for one week, and the second group (PAC-2, n=40) received the same regimen for two weeks. Endoscopy was repeated one month after the end of the treatment. RESULTS DNA extraction for clarithromycin resistance could not be performed in seven cases. Five cases were lost to follow-up. Clarithromycin resistance was found to be 44.1% (15/34) in the PAC-1 group and 58.8% (20/34) in the PAC-2 group (p>0.05). Eradication was achieved in 16 (PP: 47.1%, ITT: 44.4%) and 25 (PP:73.5%, ITT: 67.6%) patients in the PAC-1 and PAC-2 groups, respectively (p>0.05). H. pylori was eradicated in 4 of 15 (PP: 26.7%, ITT: 26.7%) clarithromycin-resistant patients in the PAC-1 group and in 12 of 20 (PP: 60%, ITT: 60%) clarithromycin-resistant patients in the PAC-2 group (p>0.05). Among the clarithromycin-sensitive ones, eradication was achieved in 12 of 19 (PP: 63.2%, ITT: 57.1%) patients in the PAC-1 group and in 13 of 14 (PP: 92.8%, ITT: 76.5%) patients in the PAC-2 group (p>0.05). CONCLUSION Although the 2-week regimen of pantoprazole-based triple therapy was effective for H. pylori eradication in clarithromycin-sensitive cases, highly effective H. pylori eradication protocols are needed for clarithromycin-resistant ones.
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Affiliation(s)
- Ahmet Aydin
- Ege University Medical School, Department of Gastroenterology, Izmir, Turkey
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15
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Onder G, Aydin A, Akarca U, Tekin F, Ozutemiz O, Ilter T. High Helicobacter pylori resistance rate to clarithromycin in Turkey. J Clin Gastroenterol 2007; 41:747-50. [PMID: 17700422 DOI: 10.1097/mcg.0b013e31802e7ee7] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
GOALS To assess the resistance of Helicobacter pylori to clarithromycin in Turkey. BACKGROUND Recent studies have emphasized the remarkable reduction in H. pylori eradication rates. Resistance to clarithromycin is the most important factor affecting the success of H. pylori eradication therapies. STUDY The study involved 110 consecutive adult dyspeptic patients infected with H. pylori. Resistance to clarithromycin was studied by real-time polymerase chain reaction method on gastric biopsy specimens. RESULTS Of the 110 patients, 56 (50.9%) were male and mean age (+/-SD) was 45.1+/-13.1 years. Overall, 53 (48.2%) patients were found to be resistant to clarithromycin. Resistance to clarithromycin was not statistically associated with age, sex, previous macrolide use, residence (urban/rural), education status, and presence of peptic ulcer. CONCLUSIONS The rate of resistance to clarithromycin was found to be markedly high. This result may explain the recently reported low success rates of H. pylori eradication therapies with clarithromycin.
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Affiliation(s)
- Goktug Onder
- Department of Gastroenterology, Ege University Medical School, Izmir, Turkey
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16
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Fischbach L, Evans EL. Meta-analysis: the effect of antibiotic resistance status on the efficacy of triple and quadruple first-line therapies for Helicobacter pylori. Aliment Pharmacol Ther 2007; 26:343-57. [PMID: 17635369 DOI: 10.1111/j.1365-2036.2007.03386.x] [Citation(s) in RCA: 268] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Information regarding the effects of drug resistance on therapies for Helicobacter pylori is limited. AIMS To determine the effect of drug resistance on the efficacy of first-line treatment regimens for H. pylori and identify the most efficacious treatments in the presence of drug resistance. METHODS We searched for studies using the keywords: 'Helicobacter pylori','resistance' and 'treatment' or 'therapy'. Multilevel meta-regression models were used to determine the effect of drug resistance on treatment efficacy. RESULTS We analysed data from 93 studies with 10,178 participants. For triple therapies, clarithromycin resistance had a greater effect on treatment efficacy than nitroimidazole resistance. Metronidazole resistance reduced efficacy by 26% in triple therapies containing a nitroimidazole, tetracycline and bismuth, while efficacy was reduced by only 14% when a gastric acid inhibitor was added to the regimen. Quadruple therapies containing both clarithromycin and metronidazole were the most efficacious; >80% of H. pylori infections were consistently eradicated with these regimens. CONCLUSIONS Drug resistance was a strong predictor of efficacy across triple therapies for the eradication of H. pylori in adults. Resistance to either clarithromycin or metronidazole, but not both simultaneously, may be overcome by using quadruple therapies, especially those containing both clarithromycin and metronidazole.
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Affiliation(s)
- L Fischbach
- University of North Texas Health Science Center, School of Public Health, Fort Worth, TX 76107, USA.
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Abstract
The standard treatment recommended for eradication of Helicobacter pylori is a combination of three drugs for seven days: one proton pump inhibitor at a double dose and two antibiotics. The high risk of failure - on the order of 30% - justifies routine testing to verify eradication after this first treatment. Verification is most often conducted with a urea breath test, more rarely by endoscopy when endoscopy or gastric histology is otherwise necessary. When eradication fails, longer multidrug treatment with different antibiotics is proposed. The failure rate after second-line treatment is 9-10%. If a third treatment is necessary, bacterial culture is recommended to select antibiotics on the basis of the antibiotic susceptibility testing.
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Affiliation(s)
- Anne Courillon-Mallet
- Service d'Hépato-Gastroentérologie, Centre Hospitalier Intercommunal, Villeneuve-Saint-Georges.
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Best LM, Haldane DJM, Keelan M, Taylor DE, Thomson ABR, Loo V, Fallone CA, Lyn P, Smaill FM, Hunt R, Gaudreau C, Kennedy J, Alfa M, Pelletier R, Veldhuyzen Van Zanten SJO. Multilaboratory comparison of proficiencies in susceptibility testing of Helicobacter pylori and correlation between agar dilution and E test methods. Antimicrob Agents Chemother 2004; 47:3138-44. [PMID: 14506021 PMCID: PMC201128 DOI: 10.1128/aac.47.10.3138-3144.2003] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Susceptibility testing was performed at seven Canadian microbiology laboratories and the Helicobacter Reference Laboratory, Halifax, Nova Scotia, Canada, to assess susceptibility testing proficiency and the reproducibility of the results for clarithromycin and metronidazole and to compare the Epsilometer test (E test) method to the agar dilution reference method. Control strain Helicobacter pylori ATCC 43504 (American Type Culture Collection) and 13 clinical isolates (plus duplicates of four of these strains including ATCC 43504) were tested blindly. The National Committee for Clinical Laboratory Standards (NCCLS) guidelines for agar dilution testing were followed, and the same suspension of organisms was used for agar dilution and E test. Antimicrobials and E test strips were provided to the investigators. Methods were provided on a website (www.Helicobactercanada.org). Each center reported MICs within the stated range for strain ATCC 43504. Compared to the average MICs, interlaboratory agreements within 2 log(2) dilutions were 90% (range, 69 to 100%) for clarithromycin by agar dilution, with seven very major errors [VMEs], and 85% (range, 65 to 100%) by E test, with three VMEs. Interlaboratory agreements within 2 log(2) dilutions were 83% (range, 50 to 100%) for metronidazole by agar dilution, with six VMEs and eight major errors (MEs), and 75% (range, 50 to 94%) by E test, with four VMEs and four MEs. At lower and higher concentrations of antibiotic, E test MICs were slightly different from agar dilution MICs, but these differences did not result in errors. When a standardized protocol based on NCCLS guidelines was used, most participants in this study correctly identified clarithromycin- and metronidazole-susceptible and -resistant strains of H. pylori 93% of the time by either the agar dilution or E test method, and the numbers of errors were relatively equivalent by both methods.
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Affiliation(s)
- L M Best
- Queen Elizabeth II Center for Clinical Research, Halifax, Canada.
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Feydt-Schmidt A, Rüssmann H, Lehn N, Fischer A, Antoni I, Störk D, Koletzko S. Fluorescence in situ hybridization vs. epsilometer test for detection of clarithromycin-susceptible and clarithromycin-resistant Helicobacter pylori strains in gastric biopsies from children. Aliment Pharmacol Ther 2002; 16:2073-9. [PMID: 12452940 DOI: 10.1046/j.1365-2036.2002.01382.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
AIM To compare the results of culture and epsilometer test with fluorescence in situ hybridization for the detection of Helicobacter pylori and the presence of clarithromycin-susceptible and clarithromycin-resistant strains in antral biopsies from children. METHODS Antral biopsies from 149 unselected children were investigated prospectively; 15 had previously received anti-H. pylori therapy. H. pylori status was defined by histology, rapid urease test and 13C-urea breath test. Fluorescence in situ hybridization was applied on fresh tissue with probes specific for the clarithromycin-susceptible wild type and three clarithromycin-resistant mutants. Susceptibility to clarithromycin was tested by epsilometer test in two laboratories. RESULTS Culture and fluorescence in situ hybridization gave negative results in all 66 H. pylori-negative children (specificity, 100%). Of 83 infected children, cultures were successful in 75 (90%), epsilometer test in 71 (86%) and fluorescence in situ hybridization in 77 (93%). Eleven children (13%) showed discrepant results between the applied methods, indicating mixed infection. Clarithromycin-resistant isolates were identified in 16 of 73 previously untreated children. CONCLUSIONS Primary resistance to clarithromycin is common (22%) in H. pylori isolates from children living in Germany. Fluorescence in situ hybridization is an excellent, fast method for the detection of H. pylori and clarithromycin-resistant mutants in gastric biopsies. Multiple biopsies identify mixed infections, indicating that clarithromycin-resistant and clarithromycin- susceptible strains are not evenly distributed within the stomach.
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Affiliation(s)
- A Feydt-Schmidt
- Dr v Haunerches Kinderspital, Ludwig-Maximilians University, Munich, Germany
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