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Morimoto N, Takeuchi H, Nishida Y, Morisawa M, Yoshikawa T, Morita T, Morimoto M, Sugimoto C, Matsumura Y, Sugiura T. Clinical Application of the DiversiLab Microbial Typing System Using Repetitive Sequence-Based PCR for Characterization of Helicobacter pylori in Japan. J Clin Lab Anal 2014; 29:250-3. [PMID: 24796534 DOI: 10.1002/jcla.21758] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2013] [Accepted: 03/03/2014] [Indexed: 12/15/2022] Open
Abstract
We evaluated the DiversiLab (DL) system with universal primers, a semiautomated repetitive extragenic palindromic sequence-based polymerase chain reaction (PCR) (rep-PCR) system, for the characterization of Helicobacter pylori in Japan. All 135 isolates from Japanese patients with gastric cancer (GC, n = 55) or non-GC (n = 80) were used and subjected to the drug susceptibility examinations (amoxicillin, AMPC; metronidazole, MNZ; and clarithromycin, CAM) by E-test. There were 28 MNZ-resistant (20.7%), 35 CAM-resistant (25.9%), and 16 MNZ/CAM-resistant (11.9%) isolates. DL rep-PCR fingerprinting analysis at the level of 95% similarity revealed five major groups (A-E) and the other including 45 isolates. The occupation rates of GC-derived isolates in groups B (54.2%) and E (58.8%) were higher than in the other groups: A (26.7%), C (28.6%), D (30.0%), and the other (40.0%). Relative higher occupation rates of drug resistants, such as MNZ-, CAM- and double MNZ/CAM-resistant isolates, were observed in groups B (45.8%), C (42.6%), and D (40%). Five of eight GC-derived isolates with MNZ/CAM resistance were significantly assigned to group B (P = 0.0312, χ(2) -test). These results suggest that the isolates classified in group B have a potential to contribute to the development of severe gastric disorders. The DL system, rapid and high sensitive technology, would be widely available in clinical laboratory for pathological and epidemiological analyses even in H. pylori.
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Affiliation(s)
- Norihito Morimoto
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan
| | - Hiroaki Takeuchi
- Clinical Laboratory Medicine, Kochi University School of Medicine, Kochi, Japan
| | - Yoshie Nishida
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan.,Clinical Laboratory Medicine, Kochi University School of Medicine, Kochi, Japan
| | - Mie Morisawa
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan
| | - Tomoe Yoshikawa
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan
| | - Tamae Morita
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan
| | - Miyuki Morimoto
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan
| | - Chizuko Sugimoto
- Clinical Laboratory Medicine, Kochi University School of Medicine, Kochi, Japan
| | - Yoshihisa Matsumura
- Clinical Laboratory Medicine, Kochi University School of Medicine, Kochi, Japan
| | - Tetsuro Sugiura
- Department of Clinical Laboratory, Kochi Medical School Hospital, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, Japan.,Clinical Laboratory Medicine, Kochi University School of Medicine, Kochi, Japan
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Lai CH, Kuo CH, Chen PY, Poon SK, Chang CS, Wang WC. Association of antibiotic resistance and higher internalization activity in resistant Helicobacter pylori isolates. J Antimicrob Chemother 2006; 57:466-71. [PMID: 16396916 DOI: 10.1093/jac/dki479] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVES Helicobacter pylori resistance to antibiotics is the main factor for therapy failure, while other features remain largely unknown. The aims of this study are to investigate the relationship of antibiotic resistance and in vitro internalization activity between cure and failure isolates and to determine whether failures are associated with persistence of the same predominant strain. METHODS Fifty-three isolates from forty-seven patients (cure group, n = 31; failure group, n = 16) receiving one of two lansoprazole-based therapies before and/or after therapy were investigated. Antibiotic susceptibility was determined by Etest. Genotyping was determined by cagA, babA, vacA and RAPD analyses. Target cells of internalization assay were AGS cells. RESULTS Five of six paired pre- and post-treatment isolates had the same predominant genetic profiles and exhibited similarly high internalization activities. The A2143G point mutation of the 23S rRNA gene conferred clarithromycin resistance. Moreover, increased antibiotic resistance after therapy was found for these five cases. Pre-treatment isolates from the failure group (n = 11) had higher level of internalization activity than those from the cure group (n = 31) (P = 0.00005). Antibiotic-resistant strains were significantly associated with higher internalization activity than were susceptible strains (metronidazole, P < 0.005; clarithromycin, P < 0.005). CONCLUSIONS Our results suggest that resistant H. pylori strains are associated with antibiotic resistance and superior internalization activity, protecting them against antibiotic treatment.
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Affiliation(s)
- Chih-Ho Lai
- Institute of Molecular and Cellular Biology & Department of Life Sciences, National Tsing Hua University, Hsinchu, Taiwan
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