Control of tuberculosis is threatened by widespread emergence of drug resistance in Mycobacterium tuberculosis. Understanding the molecular basis of resistance might lead to development of novel rapid methods for diagnosing drug resistance. Rifampin is a key component among therapeutic regimens for the tuberculosis; therefore, patients who have drug resistance do not convalesce satisfactorily. The molecular mechanism of resistance to rifampin in M. tuberulosis has been elucidated. Substitutions of a limited number of highly conserved amino acids encoded by the rpoB gene are responsible for the ""single-step"" high-level resistance of M. tuberculosis to rifampin. Currently, two genotype-based protocols allow drug test from minimally grown cultured materials: (i)mutation identification by direct sequencing of PCR-amplified material. and (ii)mutation screening by PCR-SSCP. The purpose of this study is to evaluate the usefulness of the both methods. A sample of 75 isolates of M. tuberculosis was studied, and it inculded 36 rifampin-resistant strains and 39 rifampin-sensitive strains by conventional methods. Mutaions were identified in 36 rifampin-resistant isolates but in none of 39 sensitive isolates. All mutations were clustered within a region of 23 amino acids. Both methods allow detection of rifampin resistance in 2 to 3 days and will thus help in the early management of infection by M. tuberculosis.
Amino Acids ; Drug Resistance ; Humans ; Mass Screening ; Mycobacterium tuberculosis* ; Mycobacterium* ; Rifampin ; Tuberculosis

Control of tuberculosis is threatened by widesread emergence of drug resistant Mycobacterium tuberculosis. Rifampin is a key component among therapeutic regimens for the tuberculosis; therefore patients in whom resistance to this drug develop have a poor outlook, particularly if rifampin resistance is associated with resistance to other tuberculosis drugs. The purpose of this study was to detect the mutation in rpoB gene of rifampin resistant M. tuberculosis in Korea and to evaluate the usefulness of the method in clinical aspects. A sample of 80 M. tuberculosis was studied, and it included 40 rifampin resistance isolates and 40 rifampin sensitive isolates by conventional methods. The detection method involved the amplification by polymerase chain reaction (PCR) of the Rif' region and the identification of mutations by single-strand DNA conformation polymorphism analysis (SSCP) of the amplification products (157 bp). Mutation were identified in 39 of 40 rifampin resistant isolates, and in 1 of 40 rifampin sensitive isolates.
Humans ; Korea ; Mycobacterium tuberculosis* ; Mycobacterium* ; Nucleic Acid Conformation ; Polymerase Chain Reaction* ; Rifampin ; Tuberculosis

No abstract available.
Blood Platelets* ; Leukocytes* ; Plateletpheresis*

No abstract available.
Hepacivirus* ; Hepatitis C* ; Hepatitis* ; Liver Diseases* ; Liver* ; Prevalence*

No abstract available.
Antigens, Surface* ; Leukemia*

BACKGROUND: Telomerase has a leading role as a potential enzyme responsible for tumorigenesis and longevity. Telomerase is a ribonucleoprotein that synthesizes a specific repeating nucleotide sequence onto the ends of telomeres. This enzyme is normally present in immortalized cell lines, germ-line tissues, and tumor tissues. We intended to compare the telomerase activity among various types of leukemia to determine the association of telomerase activity and patients status and responsiveness of chemotherapy. METHODS: Specimens were collected from Jan. 1999 to Oct. 1999 and included the leukemic bone marrow (ALL, AML and CML) and the peripheral blood or bone marrow of normal persons or patients with iron deficiency anemia and immune thrombocytopenic purpura. Telomerase activity was measured by TRAP assay using Telomerase PCR ELISA kit. RESULTS: Telomerase activities were increased in acute leukemias and relapsed acute leukemia cases, whereas in the cases of complete remission state of acute leukemia, the activity was decreased. Telomerase activity was increased in leukemias which had high percentage of immature cells, especially more than 70% of blast. Also the activity was decreased in post-chemotherapeutic group, whereas increased in untreated group. There was no significant difference between prognosis of chromosomal abnormalities and telomerase activity. CONCLUSION: These results showed that telomerase activity was increased in acute phase of leukemia, high percentage of immature cells, and chemoresistant group of leukemia.
Anemia, Iron-Deficiency ; Base Sequence ; Bone Marrow ; Carcinogenesis ; Cell Line ; Chromosome Aberrations ; Drug Therapy ; Enzyme-Linked Immunosorbent Assay ; Humans ; Leukemia* ; Leukemia, Myelogenous, Chronic, BCR-ABL Positive* ; Longevity ; Polymerase Chain Reaction ; Prognosis ; Purpura, Thrombocytopenic, Idiopathic ; Ribonucleoproteins ; Telomerase* ; Telomere

OBJECTIVES: The purpose of this study was to suggest a proper method for the detection of heaptitis B surface antibody(anti-HBs) in a screening program for hepatitis B vaccination. METHODS: Sensivitity, specificity and predictive values were compared between Immunochromatographic assay (ICA) and passive hemagglutination(PHA) in 978 subjects(565 males, 413 females, 19-78 years ranging in age, mean 46.5 years old). EIA was used as a standard method for the detection of HBsAb. RESULTS: Sensitivity in the detection of anti-HBs of PHA and ICA was 88.7% and 94.9%, specificity was 94.3% and 96.6%, negative predictive value was 96.5% and 98.0%, and positive predictive value was 82.3% and 91.3%, respectively. False negative rate(11.3%) of PHA was higher than that(5.1%) of ICA. The higher the titer of anti-HBs in EIA was, the lower the false negative rate was. There was no false negative result in the cases with 101mIU/ml or more in EIA. CONCLUSION: We suggest that ICA should be the choice of screening method in the detection of anti-HBs in Hepatitis B vaccination program.
Female ; Hepatitis B* ; Hepatitis* ; Humans ; Immunochromatography ; Korea* ; Male ; Mass Screening ; Sensitivity and Specificity ; Vaccination*

BACKGROUND: P-glycoprotein (PGP) is capable of expelling cytotoxic drugs from cytosol and the overexpression mediates drug resistance. However not all resistant leukemic cells express PGP. High expression of glutathione S-transferasepie (GSTpie) is related to clinical outcome following chemotherapy. Topoisomerase IIalpha (topo IIalpha) is a major target of anthracyclines for the treatment of leukemia. METHODS: To evaluate the relation of PGP, GSTpie and topo IIalpha expression to treatment outcome, PGP, GSTpie and topo IIalpha expression were analysed by flow cytometry using mono clonal antibodies (anti-JSB1, anti-GSTpie and anti-topo IIalpha) in 33 cases of de novo acute myelogenous leukemia. RESULTS: In patients with AML, the frequency of patients with high expression of PGP was 57.6% (19/33). The complete remission (CR) rate and mean survival duration were significantly different between patients with high expression and those with low expression of PGP (31.6 vs 92.9%, P=0.001; 83 vs 341 days, P=0.011). The frequency of patients with high expression of GST pie was 60.6% (20/33). The CR rate and mean survival duration were significantly different between patients with high expression and those with low expression of GSTpie (40.0 vs 84.6%, P=0.011; 115 vs 343 days, P=0.021). The frequency of patients with high expression of topo IIalpha is 78.8% (26/33) and treatment outcome was not related to topo IIalpha expression. In multivariate analysis with age, WBC count, PGP and GSTpie, PGP expression was an independent prognostic factor for treatment outcome. CONCLUSION: The flow cytometric measurement of PGP and GSTpie expression can be useful for the prediction of treament outcome following chemotherapy and PGP can be used as aprognostic factor in AML.
Adult* ; Anthracyclines ; Antibodies ; Cytosol ; DNA Topoisomerases, Type II* ; Drug Resistance ; Drug Resistance, Multiple ; Drug Therapy ; Flow Cytometry ; Glutathione S-Transferase pi* ; Glutathione Transferase* ; Glutathione* ; Humans ; Leukemia ; Leukemia, Myeloid, Acute* ; Multivariate Analysis ; P-Glycoprotein* ; Treatment Outcome

PURPOSE: To investigate the effect of growth hormone(GH) secretion on serum concentration of leptin, we evaluated the differences in serum concentration of leptin between patients with growth hormone deficiency(GHD) and GH normal short stature in prepubertal male children, and the relationship between GH and serum leptin level. Also, we analyzed the correlation between serum concentrations of leptin and insulin-like growth factor-I(IGF-I), insulin-like growth factor binding protein-3(IGFBP-3), total cholesterol(TC), free fatty acid(FFA) and body mass index(BMI). METHODS: Eight cases with GHD and 10 cases with GH normal short stature were included in this study. Patients were all male, prepubertal children with mean age 10.6 years. Blood samples were collected in these patients by L-dopa GH provocation test. Statistical analysis of the comparisons of serum leptin level and correlation of multiple variables were performed using PC-SAS program. Significance was defined as P<0.05. RESULTS: The mean serum concentration of leptin in GHD(12.27+/-10.63ng/mL) was significantly higher than in GH normal short stature(5.39+/-3.21ng/mL)(P=0.0344). Serum concentration of leptin was negatively correlated to GH(y=-7.7x+43.3, r=-0.23, P=0.0109). Serum concentration of leptin was positively correlated to BMI(y=2.5x-33.3, r=0.75, P=0.0003). Serum concentration of leptin was not correlated to IGF-I, IGFBP-3, TC and FFA. CONCLUSION: Serum concentration of leptin was siginificantly increased in patients with GHD compared to GH normal short stature and was negatively correlated to GH.
Child ; Growth Hormone* ; Humans ; Insulin-Like Growth Factor Binding Protein 3 ; Insulin-Like Growth Factor I ; Leptin* ; Levodopa ; Male

PURPOSE: This study aimed to determine the best cutoff line for insulin-like growth factor (IGF)-I and insulin-like growth factor binding protein (IGFBP)-3 to discriminate between growth hormone deficiency (GHD) patients and the control group. METHODS: Two hundred thirty subjects with normal controls (129 boys and 101 girls, aged 7-15 years), 14 patients with complete GHD (12 boys and 2 girls), and 17 patients with partial GHD (9 boys and 8 girls) were studied. IGF-I serum concentrations were measured by radioimmunoassay (RI), and IGFBP-3 concentrations were measured by immunoradiometric assay (IRMA). RESULTS: The receiver operating characteristic (ROC) plot analysis showed that the best IGF-I and IGFBP-3 cutoff line was at -1 standard deviation (SD). By comparing IGF-I serum levels of GHD children within 1 SD of normal control, we determined the sensitivity (S) (87.5-100%) and specificity (Sp) (80-84.6%) according to the age group. For IGFBP-3 , we determined the following values: S (58.7-85.7%) and Sp (79.2-85.5%). Eleven of 1 4 patients with complete GHD (78.5%) and 16 of 17 patients with partial GHD (94.1%) had IGF-I concentrations equal to or below -1 SD of the control group mean. Ten of 12 complete GHD children (83.3%) and 13 of 17 partial GHD children (76.5%) had IGFBP-3 concentrations equal or below -1 SD of the control group mean. CONCLUSION: We conclude that the measurement of IGF-I and IGFBP-3 concentrations might provide essential supplementary data in the diagnostic evaluation of patients with GHD. Our results support the need to use cutoff lines based on below -1 SD of the control.
Aged ; Carrier Proteins ; Child ; Growth Hormone ; Humans ; Immunoradiometric Assay ; Insulin-Like Growth Factor Binding Protein 3 ; Insulin-Like Growth Factor I ; Radioimmunoassay ; ROC Curve ; Sensitivity and Specificity