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Rademacher J, de Roux A, Pletz MW, Bange FC, Suhling H, Welte T, Ringshausen FC. Prädiktoren eines Lungenfunktionsverlustes bei klinisch stabilen erwachsenen Patienten mit Non-CF-Bronchiektasen. Pneumologie 2015. [DOI: 10.1055/s-0035-1544616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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2
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Ringshausen FC, Apel RM, Bange FC, de Roux A, Pletz M, Rademacher J, Suhling H, Wagner D, Welte T. Mit pulmonalen Infektionen durch nicht-tuberkulöse Mykobakterien assoziierte Krankenhausaufnahmen, Deutschland, 2005 – 2011: eine Analyse aus Daten des Statistischen Bundesamts. Pneumologie 2014. [DOI: 10.1055/s-0034-1367934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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3
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Ringshausen FC, Suhling H, Bange FC, Welte T, Gottlieb J. Tuberkulose nach Lungentransplantation - Erfahrungen der Medizinischen Hochschule Hannover zwischen 1993 und 2012. Pneumologie 2013. [DOI: 10.1055/s-0033-1334516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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4
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Bode-Jänisch S, Schütz S, Schmidt A, Tschernig T, Debertin AS, Fieguth A, Hagemeier L, Teske J, Suerbaum S, Klintschar M, Bange FC. Serum procalcitonin levels in the postmortem diagnosis of sepsis. Forensic Sci Int 2013; 226:266-72. [PMID: 23434379 DOI: 10.1016/j.forsciint.2013.01.041] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 12/09/2012] [Accepted: 01/27/2013] [Indexed: 02/08/2023]
Abstract
Procalcitonin is regarded as a valuable marker for sepsis in living persons and even in post-mortem investigations. At the Institute of Legal Medicine, 25 autopsy cases with suspected bacterial infectious diseases or sepsis were examined using the semi-quantitative PCT-Q(®)-test (B.R.A.H.M.S., Germany) in 2010 and 2011. As controls, 75 cadavers were used for which there was no suspicion of a bacterial infectious disease or sepsis. Femoral blood was cultured from the cases and from controls, and samples from the brain, heart, lungs, liver, spleen and kidneys were examined histologically for findings seen in sepsis. Twelve cases in the sepsis/infectious disease group (48%) were classifiable as sepsis following synopsis of PCT levels, autopsy results, and histopathological and microbiological findings. This study shows that the semi-quantitative PCT-Q(®)-test is a useful supplementary marker in routine autopsy investigations, capable of classifying death as due to sepsis.
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Affiliation(s)
- S Bode-Jänisch
- Hanover Medical School, Institute of Legal Medicine, Carl-Neuberg-Strasse 1, 30625 Hanover, Germany.
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5
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Mohammad-Khani S, Otremba B, Klein R, Capelle HH, Logemann F, Bange FC, Schmidt RE, Stoll M. A fatal case of AIDS-defining meningoencephalitis by C. neoformans, sensitive to antifungal therapy. Eur J Med Res 2010; 15:504-6. [PMID: 21159575 PMCID: PMC3352659 DOI: 10.1186/2047-783x-15-11-504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Cryptococcus neoformans is the most common cause of life threatening meningoencephalitis in HIV-infected patients. Diagnosis is based on tests for cryptoccocal antigen in serum and cerebrospinal fluid, and on culture of the organism. We present a case of AIDS-related cryptococcal meningoencephalitis unresponsive to antifungal combination therapy, despite of evidence of fungal susceptibility in vitro. Significant decreases in cryptococcal antigen titers in serum and cerebrospinal fluid did not correlate with progress in disease and fatal outcome.
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Affiliation(s)
- S Mohammad-Khani
- Clinic for Immunology and Rheumatology, Medical University of Hanover, Carl-Neuberg Str. 1, 30625 Hanover, Germany.
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6
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Niemann S, Kubica T, Bange FC, Adjei O, Browne EN, Chinbuah MA, Diel R, Gyapong J, Horstmann RD, Joloba ML, Meyer CG, Mugerwa RD, Okwera A, Osei I, Owusu-Darbo E, Schwander SK, Rüsch-Gerdes S. The species Mycobacterium africanum in the light of new molecular markers. J Clin Microbiol 2004; 42:3958-62. [PMID: 15364975 PMCID: PMC516319 DOI: 10.1128/jcm.42.9.3958-3962.2004] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The findings of recent studies addressing the molecular characteristics of Mycobacterium tuberculosis complex isolates have initiated a discussion on the classification of M. africanum, especially of those isolates originating from East Africa (cluster F, subtype II) and displaying phenotypic and biochemical characteristics more similar to those of M. tuberculosis. To further address this question, we analyzed a representative collection of 63 M. tuberculosis complex strains comprising 30 M. africanum subtype I strains, 20 M. africanum subtype II strains, 10 randomly chosen M. tuberculosis isolates, and type strains of M. tuberculosis, M. bovis, and M. africanum for the following biochemical and molecular characteristics: single-nucleotide polymorphisms (SNPs) in gyrB and narGHJI and the presence or absence of RD1, RD9, and RD12. For all molecular markers analyzed, subtype II strains were identical to the M. tuberculosis strains tested. In contrast, the subtype I strains as well as the M. africanum type strain showed unique combinations of SNPs in gyrB and genomic deletions (the absence of RD9 and the presence of RD12), which proves their independence from M. tuberculosis and M. bovis. Accordingly, all subtype I strains displayed main biochemical characteristics included in the original species description of M. africanum. We conclude that the isolates from West Africa were proved to be M. africanum with respect to the phenotypic and genetic markers analyzed, while the isolates from East Africa must be regarded as phenotypic variants of M. tuberculosis (genotype Uganda). We propose the addition of the molecular characteristics defined here to the species description of M. africanum, which will allow clearer species differentiation in the future.
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Affiliation(s)
- S Niemann
- Forschungszentrum Borstel, National Reference Center for Mycobacteria, Parkallee 18, D-23845 Borstel, Germany.
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7
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Abstract
In this study we introduce a rapid procedure to identify Mycobacterium abscessus (types I and II) and M. chelonae using LightCycler-based analysis of the hsp65 gene. Results from 36 clinical strains were compared with hsp65 gene restriction analysis and biochemical profiles of bacilli. As all three methods yielded identical results for each isolate, this procedure offers an excellent alternative to previously established nucleic acid amplification-based techniques for the diagnosis of mycobacterial diseases.
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Affiliation(s)
- L Sedlacek
- Department of Medical Microbiology and Hospital Epidemiology, Medical School Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
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8
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Affiliation(s)
- V Grosse
- Division of Clinical Immunology, Hannover Medical School, 30625 Hannover, Germany.
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9
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Abstract
Interferon gamma induces expression of a protein termed IFP 53 according to its molecular weight of 53 kDa. IFP 53 shows significant sequence homology to rabbit peptide chain release factor as well as to bovine tryptophanyl-tRNA synthetase. IFP 53 has been shown to possess release factor activity for the UGA stop codon. We demonstrate here, by using a recombinant IFP 53 fusion protein, that IFP 53 tryptophanylates tRNA. These data indicate that IFP 53 is a protein with two activities: peptide chain termination and aminoacylation.
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Affiliation(s)
- F C Bange
- Medical School Hannover, Institute for Medical Microbiology, Germany
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10
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Göke MN, Leppert A, Flemming P, Soudah B, Bange FC, Bleck JS, Widjaja A, Högemann B, Mellmann J, Ockenga J, Schedel I, Gebel M, Manns MP. [Intestinal tuberculosis: Easier overlooked than diagnosed]. Z Gastroenterol 2001; 39:1015-22. [PMID: 11753786 DOI: 10.1055/s-2001-19021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Intestinal tuberculosis: Easier overlooked than diagnosed. The medical history of two Asian immigrants suffering from intestinal tuberculosis demonstrates the difficulties in finding the correct diagnosis. Intestinal tuberculosis resembles Crohn's disease with regard to clinical symptoms, macroscopic and microscopic intestinal findings. Sonographic, radiologic, endoscopic, and histological examinations facilitate distinguishing both entities. Diagnosis of intestinal tuberculosis is made by identification of the causative microorganism in tissue specimens. As this may be difficult and time-consuming, a therapeutic trial with anti-tuberculous agents may be warranted.
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Affiliation(s)
- M N Göke
- Abteilung Gastroenterologie und Hepatologie, Hannover, Germany.
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11
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Bange FC, Brown BA, Smaczny C, Wallace RJ, Böttger EC. Lack of transmission of mycobacterium abscessus among patients with cystic fibrosis attending a single clinic. Clin Infect Dis 2001; 32:1648-50. [PMID: 11340540 DOI: 10.1086/320525] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2000] [Revised: 11/13/2000] [Indexed: 11/03/2022] Open
Abstract
We retrospectively analyzed 1062 respiratory specimens from 214 patients with cystic fibrosis, of whom 5 patients had 36 cultures positive for M. abscessus. Results of molecular typing demonstrated that each of these 5 patients carried a single unique strain (genotype), which suggests that it may not be necessary to segregate patients with CF who are colonized or infected with M. abscessus from those who are not.
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Affiliation(s)
- F C Bange
- Department of Medical Microbiology, Medical School Hannover, Hannover, Germany.
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Bange FC, Ruttkowski S, Kist M, Bereswill S, Meyer D, Schmidt RE, Tillmann H, Schedel I, Manns MP, Gunzer F. Clinical microbiological case: a 35-year-old HIV-positive man with intermittent fever and chronic diarrhea. Clin Microbiol Infect 2000; 6:613-5. [PMID: 11168065 DOI: 10.1046/j.1469-0691.2000.00157.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- F C Bange
- Department of Medical Microbiology, Medical School of Hannover, Germany
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Weber I, Fritz C, Ruttkowski S, Kreft A, Bange FC. Anaerobic nitrate reductase (narGHJI) activity of Mycobacterium bovis BCG in vitro and its contribution to virulence in immunodeficient mice. Mol Microbiol 2000; 35:1017-25. [PMID: 10712684 DOI: 10.1046/j.1365-2958.2000.01794.x] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Mycobacterium tuberculosis and Mycobacterium bovis cause tuberculosis, which is responsible for the deaths of more people each year than any other bacterial infectious disease. Disseminated disease with Mycobacterium bovis BCG, the only currently available vaccine against tuberculosis, occurs in immunocompetent and immunodeficient individuals. Although mycobacteria are obligate aerobes, they are thought to face an anaerobic environment during infection, notably inside abscesses and granulomas. The purpose of this study was to define a metabolic pathway that could allow mycobacteria to exist under these conditions. Recently, the complete genome of M. tuberculosis has been sequenced, and genes homologous to an anaerobic nitrate reductase (narGHJI), an enzyme allowing nitrate respiration when oxygen is absent, were found. Here, we show that the narGHJI cluster of M. tuberculosis is functional as it conferred anaerobic nitrate reductase activity to Mycobacterium smegmatis. A narG mutant of M. bovis BCG was generated by targeted gene deletion. The mutant lacked the ability to reduce nitrate under anaerobic conditions. Both mutant and M. bovis BCG wild type grew equally well under aerobic conditions in vitro. Histology of immunodeficient mice (SCID) infected with M. bovis BCG wild type revealed large granulomas teeming with acid-fast bacilli; all mice showed signs of clinical disease after 50 days and succumbed after 80 days. In contrast, mice infected with the mutant had smaller granulomas containing fewer bacteria; these mice showed no signs of clinical disease after more than 200 days. Thus, it seems that nitrate respiration contributes significantly to virulence of M. bovis BCG in immunodeficient SCID mice.
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Affiliation(s)
- I Weber
- Institute of Medical Microbiology and Department of Pathology, Medical School Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
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Bange FC, Collins FM, Jacobs WR. Survival of mice infected with Mycobacterium smegmatis containing large DNA fragments from Mycobacterium tuberculosis. Tuber Lung Dis 2000; 79:171-80. [PMID: 10656115 DOI: 10.1054/tuld.1998.0201] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Mycobacterium smegmatis is typically used as a bacterial host for cloning and expressing single genes or genomic libraries of the human pathogen Mycobacterium tuberculosis. To study virulence of M. tuberculosis, we set out to ask the question, whether a genomic library derived from M. tuberculosis H37Rv confers virulence to the non-virulent M. smegmatis. A representative library from the M. tuberculosis H37Rv genome was generated and transformed into wild-type M. smegmatis. Mice were challenged with recombinant clones by intravenous, aerogenic and intranasal infection. We were unable to detect either growth or persistence of recombinant clones in tissues of infected mice; instead, the infection was cleared. Since the concern that virulent traits might be transferred, bio-safety regulations often require the handling of these experiments at bio-safety Level 3. However, we failed to find any evidence that the M. tuberculosis library confers virulence when expressed in M. smegmatis. We suggest that the results, presented here, should fundamentally alter the containment requirements for similar experiments in the future.
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Affiliation(s)
- F C Bange
- Institute of Medical Microbiology, Medical School of Hannover, Germany
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15
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Abstract
Despite decontamination, overgrowth by pseudomonads renders cultural isolation of mycobacteria from respiratory specimens of patients with cystic fibrosis (CF) difficult or impossible. We performed a prospective study by comparing levels of reduction of overgrowth and recovery of mycobacteria using either pretreatment with N-acetyl-L-cysteine (NALC)-NaOH alone or pretreatment with NALC-NaOH and then with oxalic acid. From 406 specimens of 148 CF patients, 11 specimens were positive for mycobacteria, 5 of which grew mycobacteria after decontamination by either procedure. Three specimens grew mycobacteria only after decontamination with NALC-NaOH, whereas three specimens grew mycobacteria only after treatment with NALC-NaOH followed by oxalic acid but were overgrown after decontamination with NALC-NaOH. Thus, inactivation of mycobacteria by the more aggressive oxalic acid treatment offsets its beneficial effect of reducing the proportion of cultures overgrown with microorganisms other than mycobacteria.
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Affiliation(s)
- F C Bange
- Institute of Medical Microbiology, Medical School Hannover, 30625 Hannover, Germany.
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16
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Abstract
The ability of slow-growing mycobacteria to replicate within host mononuclear phagocytes is thought to be central to the pathogenesis of mycobacterial infection. However, because of the lack of a mycobacterial mutant defective for intracellular replication, it has not been possible to test this hypothesis directly. Previously, we showed that a BCG leucine auxotroph with a transposon disruption of the leuD gene is unable to grow in mice. Here we demonstrate that this mutant is also incapable of replicating within cultured macrophages in vitro. Complementation of the leuD mutation with the leuCD genes of Escherichia coli restored wild-type levels of growth in macrophages, establishing that the defect for intracellular replication was due to leucine auxotrophy per se and not to a polar effect of the transposon insertion on an adjacent gene. These results suggest that the inability of the leucine auxotroph to grow in mice was due to its sequestration, after phagocytosis, in an intracellular compartment from which it could not obtain leucine.
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Affiliation(s)
- F C Bange
- Department of Microbiology and Immunology, Howard Hughes Medical Institute, Albert Einstein College of Medicine, Yeshiva University, Bronx, New York 10461, USA
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17
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Bonnekoh B, Huerkamp C, Wevers A, Geisel J, Sebök B, Bange FC, Greenhalgh DA, Böttger EC, Krieg T, Mahrle G. Up-regulation of keratin 17 expression in human HaCaT keratinocytes by interferon-gamma. J Invest Dermatol 1995; 104:58-61. [PMID: 7528246 DOI: 10.1111/1523-1747.ep12613492] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The immortalized human keratinocyte cell line HaCaT was used to assess the effect of interferon-gamma (IFN-gamma) on expression of keratin K17. Both IFN-gamma and K17 have been implicated in the pathophysiology of psoriasis. Western and quantitative enzyme-linked immunosorbent assay analyses demonstrated increasing induction of K17 protein by 48 h exposure to IFN-gamma at concentrations of 10, 50, and 250 U/ml. At 50 U/ml IFN-gamma, immunohistochemical analysis revealed numerous K17-positive foci, whereas in situ hybridization demonstrated K17 message in the majority of cells. In addition, at low (5 U/ml) concentrations of IFN-gamma, cell proliferation and protein synthesis decreased, as determined by 3H-thymidine labeling and 14C-amino acid uptake. These data suggest that aberrant K17 expression observed in psoriatic lesions may be a consequence of IFN-gamma overexpression, and that the HaCaT cell line may be a useful in vitro model system to elucidate the underlying mechanisms.
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Affiliation(s)
- B Bonnekoh
- Department of Dermatology, University of Cologne, Germany
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18
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Meier A, Kirschner P, Bange FC, Vogel U, Böttger EC. Genetic alterations in streptomycin-resistant Mycobacterium tuberculosis: mapping of mutations conferring resistance. Antimicrob Agents Chemother 1994; 38:228-33. [PMID: 8192448 PMCID: PMC284431 DOI: 10.1128/aac.38.2.228] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
We report on the identification of mutations associated with streptomycin resistance in Mycobacterium tuberculosis. Two isolates (3656 and 3976) showed a wild-type ribosomal protein, S12, but exhibited a single point mutation at 16S rRNA position 491 (C-->T) or 512 (C-->T), respectively. Sequence analysis of a third isolate (2438) revealed a single base change at 16S rRNA position 904 (A-->G). This position is equivalent to invariant position 913 of the Escherichia coli 16S rRNA gene, an A-->G transition of which has been shown previously to impair streptomycin binding and streptomycin-induced misreading in vivo. Surprisingly, strain 2438 harbors an additional mutation in the ribosomal protein S12 (Lys-88-->Gln).
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Affiliation(s)
- A Meier
- Institut für Medizinische Mikrobiologie, Medizinische Hochschule Hannover, Germany
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Bange FC, Vogel U, Flohr T, Kiekenbeck M, Denecke B, Böttger EC. IFP 35 is an interferon-induced leucine zipper protein that undergoes interferon-regulated cellular redistribution. J Biol Chem 1994; 269:1091-8. [PMID: 8288566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
We have isolated a new human cDNA, named IFP 35, whose expression is regulated by interferons (IFN). Induction of IFP 35 mRNA in HeLa cells by IFN is due, at least in part, to increased transcription. In response to IFN treatment, the expression of IFP 35 mRNA is seen in a wide range of different cell types, including fibroblasts, macrophages, and epithelial cells. The cDNA sequence encodes a 282-amino acid protein with a deduced molecular mass of 31,130 Da. In vitro translation of mRNA obtained by both in vitro transcription and hybrid selection resulted in the synthesis of a 35-kDa protein. Antisera raised against IFP 35 recognized a protein with an apparent molecular mass of 35 kDa in HeLa cells. Amino acid sequence analysis revealed a leucine zipper motif in an alpha-helical configuration at the extreme amino terminus of IFP 35. Notable IFP 35 is a unique novel leucine zipper protein in that it lacks a basic domain critical for DNA binding. IFP 35 can specifically form homodimers in vitro. Western blot analysis of fractionated cell extracts indicates increased nuclear localization following IFN treatment.
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Affiliation(s)
- F C Bange
- Institut für Medizinische Mikrobiologie, Medizinische Hochschule Hannover, Germany
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20
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Kirschner P, Springer B, Vogel U, Meier A, Wrede A, Kiekenbeck M, Bange FC, Böttger EC. Genotypic identification of mycobacteria by nucleic acid sequence determination: report of a 2-year experience in a clinical laboratory. J Clin Microbiol 1993; 31:2882-9. [PMID: 7505291 PMCID: PMC266149 DOI: 10.1128/jcm.31.11.2882-2889.1993] [Citation(s) in RCA: 348] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Clinical isolates of Mycobacterium spp. were identified by direct sequence determination of 16S rRNA gene fragments amplified by polymerase chain reaction. Identification was based on a hypervariable region within the 16S rRNA gene in which mycobacterial species are characterized by species-specific nucleotide sequences. A manually aligned data base including the signature sequences of 52 species of mycobacteria easily allowed rapid and correct identification. The results of this study demonstrate that polymerase chain reaction-mediated direct sequence determination can be used as a rapid and reliable method for the identification of mycobacteria in the clinical laboratory. In addition, the prompt recognition of previously undescribed species is now feasible.
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Affiliation(s)
- P Kirschner
- Institut für Medizinische Mikrobiologie, Medizinische Hochschule Hannover, Germany
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21
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Strehlow I, Seegert D, Frick C, Bange FC, Schindler C, Böttger EC, Decker T. The gene encoding IFP 53/tryptophanyl-tRNA synthetase is regulated by the gamma-interferon activation factor. J Biol Chem 1993; 268:16590-5. [PMID: 8344940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We have obtained genomic DNA encoding the interferon-gamma (IFN-gamma)-inducible IFP 53/tryptophanyl-tRNA synthetase. Comparison with several different IFP 53 cDNA clones revealed a complex pattern of alternatively spliced 5'-untranslated regions. The interferon-responsive region within the IFP 53 promoter was found to contain a gamma-interferon activation site (GAS) but not the interferon-stimulated response element and to bind the gamma-interferon activation factor (GAF). GAF.GAS complexes contained the IFN-regulated 91-kDa protein. Competition experiments defined the GAS boundaries and showed that GAF binding to the IFP 53 GAS could be prevented by an excess of the IFN-gamma response regions of several other IFN-gamma-inducible genes. We thus provide evidence for a central role of GAS.GAF in gene transcription mediated by IFN-gamma and suggest a consensus sequence defining more precisely the requirements for GAF binding to DNA.
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Affiliation(s)
- I Strehlow
- Fraunhofer Institute for Toxicology and Molecular Biology, Hannover, Germany
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22
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Flohr T, Bange FC, von Euch A, Kiekenbeck M, Böttger EC. Depletion of tryptophan is not involved in expression of tryptophanyl-tRNA synthetase mediated by interferon. Infect Immun 1992; 60:4418-21. [PMID: 1398953 PMCID: PMC257482 DOI: 10.1128/iai.60.10.4418-4421.1992] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Gamma interferon (IFN-gamma) affects tryptophan metabolism by mediating the expression of indoleamine 2,3-dioxygenase and tryptophanyl-tRNA synthetase. In the present study, we investigated the role of indoleamine 2,3-dioxygenase-mediated tryptophan depletion in the induction of tryptophanyl-tRNA synthetase by IFN-gamma. The addition of excess tryptophan to the culture medium did not affect the induction of tryptophanyl-tRNA synthetase by IFN-gamma, indicating that tryptophan degradation is not directly involved in the IFN-gamma-mediated expression of tryptophanyl-tRNA synthetase.
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Affiliation(s)
- T Flohr
- Institute for Medical Microbiology, Medical School Hannover, Germany
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23
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Abstract
In previous investigations, it was demonstrated that interferons (IFN) have antiproliferative effects in human urothelial carcinomas. However, appreciable differences were found in the sensitivity of the individual tumors investigated. We therefore examined whether this might be due to a different receptor status of the cells. The IFN-sensitive cell lines RT4 and SD as well as the IFN-resistant cell line 639V were investigated with regard to their IFN receptor status. It was demonstrated that IFN receptors were present on the cell surface in all three urothelial carcinomas investigated. The number of IFN receptors calculated for the IFN-resistant cell line 639V was 4.661 per cell, whereas the IFN-sensitive cell line SD had 4.391 receptors and RT4 had 3.307 receptors. The IFN affinity of the three cell lines tested differed only slightly. Therefore IFN affinity is unlikely to account for their marked differences in IFN sensitivity.
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Affiliation(s)
- J W Grups
- Department of Urology, University of Würzburg Medical School, FRG
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