HAK HOTTA
Center for Infectious Diseases, Kobe University Graduate School of Medicine, Hyogo 650-0017, Japan

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Analyses of Precore and Core Promoter Mutations of Hepatitis B Virus in Patients with Chronic Hepatitis B in Surabaya, Indonesia JUNIASTUTI, .; AKSONO, EDUARDUS BIMO; UTSUMI, TAKAKO; YANO, YOSHIHIKO; SOETJIPTO, .; HAYASHI, YOSHITAKE; HOTTA, HAK; RANTAM, FEDIK ABDUL; KUSUMOBROTO, HERNOMO ONTOSENO; LUSIDA, MARIA INGE
Microbiology Indonesia Vol 4, No 3 (2010): December 2010
Publisher : Indonesian Society for microbiology

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Abstract

Mutations of precore (A1896) and core promoter (T1762/A1764) of hepatitis B virus can reduce HBeAg production. These mutations are frequently found in the late HBeAg seroconversion. However, it has been a controversy about the role played by precore and core promoter mutations in determining outcome of chronic hepatitis B. In the present study, the variability of precore and core promoter of hepatitis B virus were analyzed using PCR amplification and sequencing, according to the outcome (viral load and HBeAg/anti-HBe) in chronic hepatitis B patients in Surabaya. The study groups included 5 patients with uncomplicated chronic hepatitis B and 10 patients with chronic hepatitis B and liver cirrhosis in Dr. Soetomo Hospital, Surabaya. The control group included 6 blood donors obtained from Indonesia Red Cross, Surabaya. All groups were HBsAg positive. Precore mutation A1896 was predominant in all groups (60%-67% of each), together with precore variant T1858. As reported, precore variant T1858 is a prerequisite for precore A1896 and characteristic for viral genotype. Nevertheless, core promoter mutations T1762/A1764 were predominant only in LC patients (60%). All of these mutations were found mostly after HBeAg seroconversion (anti-HBe+). Of most samples with anti-HBe+, precore mutation was related with low viral load (<105 copies/mL), but core promoter mutations with high viral load (>105 copies/mL). Precore mutation A1896 was predominant in all groups, but core promoter mutations T1762/A1764 were only predominant in LC patients. The precore mutation alone is possible not critical to indicate a poor outcome, the core promoter mutations must be considered also.
Evaluating the use of loop-mediated isothermal amplification (LAMP) method for detection of Mycobacterium tuberculosis in Indonesian clinical isolates Lisdawati, Vivi; Oshibe, Tomohiro; Tsuji, Hidetaka; Sudiro, Tjahjani M.; Adianti, Myrna; Sukarso, Triyani; Arief, Holy; Hotta, Hak; Sudarmono, Pratiwi
Medical Journal of Indonesia Vol 21, No 4 (2012): November
Publisher : Faculty of Medicine Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (526.167 KB) | DOI: 10.13181/mji.v21i4.502

Abstract

Background: Loop-mediated isothermal amplification (LAMP) is a method already claimed as a simple technique to amplify DNA/ RNA using four to six primers as “a set” from conserved sequence of target gene. In this study we optimize the use of LAMP for detection of Mycobacterium tuberculosis in clinical isolates from Indonesia.Methods: Procedures to perform LAMP were optimized, then the method was applied to 122 archieved samples of DNA’s Mtb from clinical TB patients with Acid Fast Bacilli (AFB) smears positive. The samples were obtained in 2008 from 13 provinces in Indonesia for genotyping study, which then become collections of Center for Biomedical and Basic Technology of Health (CBBTH), NIHRD Indonesia. The optimization tests include sensitivity and specificity tests of several sets primers, which were evaluated using 10-fold serially diluted DNA of Mtb H37Rv and 12 species of Mycobacteria. Three equipments consisted of LAMP turbidimeter, heating block and water bath were compared for its ability in DNA amplification. Detection of M. tuberculosis from clinical isolates used set primers specific for gyrB gene, amplicon was detected with UV fluorescence system.Results: The results showed that the highest sensitivity was obtained using the set primers specific for 16S rRNA and gyrB which could detect 10.0 fg to 1.0 pg genomic DNA of Mtb H37Rv. The set primers specific for gyrB gene was the most specific primers. Application of LAMP using gyrB set primers on Indonesian clinical isolates showed 94.2% (114/121) positivity rate.Conclusion: LAMP method is potentially used in TB diagnosis in Indonesia. (Med J Indones. 2012;21:188-95)Keywords: Loop-mediated isothermal amplification, rim gene, 16S rRNA gene, gyrB gene, Mycobacterium tuberculosis
Antiviral effect of Archidendron pauciflorum leaves extract to hepatitis C virus: An in vitro study in JFH-1 strain Hartati, Sri; Aoki, Chie; Hanafi, Muhammad; Angelina, Marissa; Soedarmono, Pratiwi; Hotta, Hak
Medical Journal of Indonesia Vol 27, No 1 (2018): March
Publisher : Faculty of Medicine Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.399 KB) | DOI: 10.13181/mji.v27i1.2189

Abstract

Background: Hepatitis C virus (HCV) is a leading cause of chronic liver diseases. Drug resistance to the regimen is also increasing. Hence, there is a need for new anti-HCV agents that are less toxic and more efficacious. The aim of this study is to evaluate the  possibility of A. pauciflorum extracts can be a antiviral drug.Methods: Huh-7it cells were infected with the HCV genotype 2a strain JFH-I in the presence of methanol extracts of Archidenron pauciflorum. The methanol extract further partition used n-hexane, ethyl acetate, n-butanol, and water showed in which butanol extracts exerted the strongest IC50 (6.3 g/ml). Further, the butanol fraction was fractionated and yielded into 13 fractions.Results: The methanol extract of the leaves of A. pauciflorum exhibited concentration dependent inhibition against the JFH1 strain of HCV genotype 2a with an IC50 is 72.5 μg/ml. The butanol fraction exhibited the highest anti-HCV activity with an IC50 is 6.3 μg/ml. The butanol fraction was fractionated which yielded 13 fractions. Fractions 5 and 13 exhibited high anti-HCV activities with IC50 is 5.0 μg/ml and 8.5 μg/ml and a time-of-addition study demonstrated that fraction 5 inhibited viral infection at the post-entry step, whereas fraction 13 primarily inhibited the viral entry step.Conclusion: The extract A. pauciflorum can be used as a herbal-based antiviral drug.