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Petruccelli BP, Goldenbaum M, Scott B, Lachiver R, Kanjarpane D, Elliott E, Francis M, McDiarmid MA, Deeter D. Health effects of the 1991 Kuwait oil fires: a survey of US army troops. J Occup Environ Med 1999; 41:433-9. [PMID: 10390693 DOI: 10.1097/00043764-199906000-00008] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The burning of oil wells in Kuwait in 1991 discharged a high volume of potentially toxic pollutants into the air. To determine whether there were health-related complaints associated with having lived and worked there, questionnaires were administered to 1599 soldiers after their return from a 3-month mission in Kuwait. Symptoms occurring before, during, and after the mission were queried. Compared with baseline, symptoms reported more frequently for the Kuwait period were eye and upper respiratory tract irritation, shortness of breath, cough, rashes, and fatigue. Symptoms were associated with reported proximity to oil fires, and their incidence generally decreased after the soldiers left Kuwait. Oil-fire smoke is one of several possible factors that may have contributed to the reporting of symptoms.
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102
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Bhatt R, Scott B, Whitney S, Bryan RN, Cloney L, Lebedev A. Detection of nucleic acids by cycling probe technology on magnetic particles: high sensitivity and ease of separation. NUCLEOSIDES & NUCLEOTIDES 1999; 18:1297-9. [PMID: 10474219 DOI: 10.1080/07328319908044696] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Cycling Probe Technology (CPT) is a signal amplification system that allows detection of nucleic acid target sequences without target amplification. CPT employs a sequence specific chimeric probe, typically DNA-RNA-DNA, which hybridizes to a complementary target DNA sequence and becomes a substrate for RNase H. Cleavage occurs at the RNA internucleotide linkages and results in dissociation of the probe from the target, thereby making it available for the next probe molecule. This communication describes the use of oligonucleotides attached to solid supports for target capture and release followed by solution and solid phase cycling. Through the attachment of chimeric probes to Sera-Mag magnetic particles (SMP) a simple and effective method of separating the cleaved probe from non-cycled probe has been developed. By capturing the target DNA on particles and separating it from the extraneous non-specific DNA we are able to dramatically reduce background and thus discriminate between samples of Methicillin Resistant (MRSA) and Methicillin Sensitive (MSSA) Staphylococcus Aureus. We conjugated oligonucleotide probes to SMPs (approximately 1 um) and Nylon beads (NB) which were coated with ID Biomedical's proprietary coating materials (R, patent pending). The general structure of the constructs is shown below: [table: see text]
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103
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Marzo AL, Lake RA, Lo D, Sherman L, McWilliam A, Nelson D, Robinson BW, Scott B. Tumor antigens are constitutively presented in the draining lymph nodes. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1999; 162:5838-45. [PMID: 10229818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Tumor growth is rarely associated with a strong specific CTL response, suggesting that the immune system is ignorant of the presence of tumor because the Ags are not readily available to or are sequestered from potential effector cells. We studied the in vivo activation of naive TCR transgenic hemagglutinin (HA)-specific CD8+ T cells adoptively transferred into mice bearing HA-expressing tumor using 5,6-carboxy-succinimidyl-fluorescein-ester labeling, which allows the identification of proliferating HA-specific T cells. We demonstrate that tumor Ags are constitutively presented in the lymph nodes draining tumors and are powerfully mitogenic for responding T cells despite the absence of anti-tumor CTL responses. Importantly, this proliferative signal occurs throughout tumor growth and is still detectable 6 mo after tumor inoculation when tumor is not palpable. These results provide the first evidence that there is constitutive presentation of tumor Ags in draining lymph nodes.
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104
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Gibbins JR, Manthey A, Tazawa YM, Scott B, Bloch-Zupan A, Hunter N. Midline fusion in the formation of the secondary palate anticipated by upregulation of keratin K5/6 and localized expression of vimentin mRNA in medial edge epithelium. THE INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY 1999; 43:237-44. [PMID: 10410903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Secondary palatal fusion is dependent on targeted removal of the epithelium between the palatal shelves. Aseptically delivered rat embryos 15 through 18 days post coitum (dpc) were probed with DIG-labeled antisense and sense ssDNA probes for spliced exon sequences flanking intron E of cytokeratins K5/6 and spliced exon sequences flanking intron F of vimentin. Cytokeratin K5/6 expression was upregulated in the medial edge epithelium (MEE) prior to rotation of the palatal shelves and in the vomerine epithelium in the region of fusion with the palate. K5/6 expression continued in the medial epithelial seam (MES) and in epithelial islands during breakdown of the MES. Vimentin expression was not detected in the MEE prior to rotation but was specifically upregulated in the MEE following rotation and prior to midline contact and continued in the MES and in epithelial cells identifiable during the breakdown of the MES. Initiation of vimentin upregulation in the MEE prior to contact of the palatal shelves was tested by serum-free organ culture of palates from embryos at 15.5 dpc with the shelves separated by a biocompatible membrane. Vimentin upregulation occurred in the epithelium specifically in the region of anticipated contact. These results are interpreted as indicating that i) cytokeratin K5/6 expression may play a critical role in the integration of the epithelial layers of the MES to ensure subsequent merging of the mesenchyme and ii) epithelial cells in the MEE are specifically 'primed' to upregulate expression of mesenchymal genes prior to integration into and breakdown of the MES.
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105
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Ghaderi A, Scott B. Prevalence and psychological correlates of eating disorders among females aged 18-30 years in the general population. Acta Psychiatr Scand 1999; 99:261-6. [PMID: 10223428 DOI: 10.1111/j.1600-0447.1999.tb07223.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The prevalence of eating disorders (ED) according to DSM-IV, and also correlates of ED, were examined. METHOD This study represented the first phase of a questionnaire-based prospective study. The subjects consisted of 1157 women randomly selected from the general population of females aged 18-30 years in Sweden. RESULTS Lifetime and point prevalences of 7.8% and 2.6%, respectively, were reported for ED. Subjects with ED reported lower self-esteem, less perceived social support from the family and higher concern about body shape than controls. CONCLUSION Establishing the prevalence and correlates of ED simultaneously and longitudinally among females in the general population may promote our understanding of the development, course and maintenance of ED.
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106
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Moon CD, Tapper BA, Scott B. Identification of Epichloë endophytes in planta by a microsatellite-based PCR fingerprinting assay with automated analysis. Appl Environ Microbiol 1999; 65:1268-79. [PMID: 10049893 PMCID: PMC91174 DOI: 10.1128/aem.65.3.1268-1279.1999] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/1998] [Accepted: 10/06/1998] [Indexed: 11/20/2022] Open
Abstract
Epichloë endophytes are a group of filamentous fungi that include both sexual (Epichloë) and asexual (Neotyphodium) species. As a group they are genetically diverse and form both antagonistic and mutualistic associations with temperate grasses. We report here on the development of a microsatellite-based PCR system for fingerprinting this group of fungi with template isolated from either culture or infected plant material. M13mp19 partial genomic libraries were constructed for size-fractionated genomic DNA from two endophyte strains. These libraries were screened with a mixture of DIG-labeled dinucleotide and trinucleotide repeat probes. Positive clones were sequenced, and nine unique microsatellite loci were identified. An additional microsatellite was serendipitously identified in the 3' untranscribed region of the 3-hydroxy-3-methylglutaryl coenzyme A (HMG CoA) reductase gene from N. lolii Lp19. Primers were designed for each locus and a panel of endophytes, from different taxonomic groupings, was screened to determine the degree of polymorphism. On the basis of these results a multiplex assay was developed for strain identification with fluorescently labeled primers for five of these loci. Using this system the size of the products amplified can be precisely determined by automated analysis, and an allele profile for each strain can be readily generated. The assay was shown to resolve endophyte groupings to the level of known isozyme phenotype groupings. In a blind test the assay was used successfully to identify a set of endophytes in planta. A reference database of allele sizes has been established for the panel of endophytes examined, and this will be expanded as new strains are analyzed.
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107
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Marzo AL, Lake RA, Robinson BW, Scott B. T-cell receptor transgenic analysis of tumor-specific CD8 and CD4 responses in the eradication of solid tumors. Cancer Res 1999; 59:1071-9. [PMID: 10070965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
The role of tumor-specific CD8 and CD4 lymphocytes in rejecting solid tumors has been difficult to determine because of the lack of models in which tumor antigen, specific CD8 cells, and specific CD4 cells can be monitored and controlled. To investigate the minimal components required for the induction and maintenance of CTL activity sufficient to reject a solid tumor in vivo, we transfected the influenza hemagglutinin (HA) gene into a nonimmunogenic class I+/class II- murine malignant mesothelioma (MM) tumor line to generate an endogenous tumor antigen and used TCR transgenic mice with class I- or class II-restricted specificities for HA as sources of naive, tumor-specific T cells. The data show that the presence of a strong tumor antigen is not in itself sufficient to induce an effective CTL response, nor does the presence of a high frequency of precursor cells guarantee tumor rejection. We also show that tumor-specific CD4 cells, when CTL numbers are suboptimal, greatly enhance the eradication of tumor, confirming the importance of antigen-presenting cell presentation of tumor antigens to class II-restricted cells. These data confirm that T-cell receptor transgenic cells, combined with nominal tumor antigen transfection, represent powerful tools to analyze tumor-specific T-cell responses.
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MESH Headings
- Animals
- Antigens, Neoplasm/genetics
- Antigens, Neoplasm/immunology
- CD4-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/immunology
- Cell Division
- Clone Cells
- Female
- Gene Expression Regulation, Neoplastic/immunology
- Genes, MHC Class I
- Hemagglutinin Glycoproteins, Influenza Virus/genetics
- Histocompatibility Antigens Class I/immunology
- Histocompatibility Antigens Class II/genetics
- Histocompatibility Antigens Class II/immunology
- Lymphocyte Activation
- Lymphocyte Depletion
- Mesothelioma/genetics
- Mesothelioma/immunology
- Mesothelioma/pathology
- Mesothelioma/therapy
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Mice, Transgenic
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/physiology
- T-Lymphocytes, Cytotoxic/immunology
- Transfection
- Tumor Cells, Cultured
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108
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Ganley AR, Scott B. Extraordinary ribosomal spacer length heterogeneity in a neotyphodium endophyte hybrid: implications for concerted evolution. Genetics 1998; 150:1625-37. [PMID: 9832538 PMCID: PMC1460432 DOI: 10.1093/genetics/150.4.1625] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
An extraordinary level of length heterogeneity was found in the ribosomal DNA (rDNA) of an asexual hybrid Neotyphodium grass endophyte, isolate Lp1. This hybrid Neotyphodium endophyte is an interspecific hybrid between two grass endophytes, Neotyphodium lolii, and a sexual form, Epichlöe typhina, and the length heterogeneity was not found in either of these progenitor species. The length heterogeneity in the hybrid is localized to the intergenic spacer (IGS) and is the result of copy-number variation of a tandemly repeated subrepeat class within the IGS, the 111-/119-bp subrepeats. Copy number variation of this subrepeat class appears to be a consequence of mitotic unequal crossing over that occurs between these subrepeats. This implies that unequal crossing over plays a role in the concerted evolution of the whole rDNA. Changes in the pattern of IGS length variants occurred in just two rounds of single-spore purification. Analysis of the IGS length heterogeneity revealed features that are unexpected in a simple model of unequal crossing over. Potential refinements of the molecular details of unequal crossing over are presented, and we also discuss evidence for a combination of homogenization mechanisms that drive the concerted evolution of the Lp1 rDNA.
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109
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Caminschi I, Venetsanakos E, Leong CC, Garlepp MJ, Scott B, Robinson BW. Interleukin-12 induces an effective antitumor response in malignant mesothelioma. Am J Respir Cell Mol Biol 1998; 19:738-46. [PMID: 9806738 DOI: 10.1165/ajrcmb.19.5.3257m] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Malignant mesothelioma (MM) is a fatal solid tumor of the mesothelium for which there is currently no ameliorating treatment. Using our murine model of this malignancy, which closely resembles the human disease, we have shown that immunotherapy may be of value in the treatment of MM. Because recombinant interleukin-12 (rIL-12) has strong immunomodulatory effects in vivo, we studied the effects of rIL-12 on murine antitumor immune responses, using a nonimmunogenic murine MM tumor cell line (AB1) in vivo. Systemic administration of rIL-12 at the time of tumor inoculation prevented AB1 tumor growth in up to 70% of treated mice, 50% of which were still resistant to AB1 upon rechallenge, indicating that long-term immunologic antitumor effects had been established. This rIL-12-induced effect was dependent on the involvement of both CD4(+) and CD8(+) but not natural killer (NK) cells. Importantly, treatment of established tumors with intralesional injections of rIL-12 resulted in temporary tumor regression or growth inhibition. This effect was dependent on the continuous presence of rIL-12 and correlated with increased numbers of CD4(+) and CD8(+) cells infiltrating the remaining tumor mass. Effective inhibition of tumor growth also occurred when IL-12 was released within MM tumors by coadministration of MM cells that had been stably transfected with the gene for IL-12. These data indicate that IL-12 has potential in the immunotherapy of MM, through gene transfer or local cytokine administration, provided that significant intratumor levels of IL-12 can be achieved for prolonged periods.
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110
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111
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Cambell T, Sieve A, Scott B, Kecmanovic J, Meagher M, Welsh C. The effect of stress on the neuropathogenesis of Theiler's virus-induced demyelination (TVID) as a model for multiple sclerosis. J Neuroimmunol 1998. [DOI: 10.1016/s0165-5728(98)91410-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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112
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Summit M, Scott B, Nielson K, Mathur E, Baross J. Pressure enhances thermal stability of DNA polymerase from three thermophilic organisms. Extremophiles 1998; 2:339-45. [PMID: 9783182 DOI: 10.1007/s007920050077] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
DNA polymerases derived from three thermophilic microorganisms, Pyrococcus strain ES4, Pyrococcus furiosus, and Thermus aquaticus, were stabilized in vitro by hydrostatic pressure at denaturing temperatures of 111 degrees C, 107.5 degrees C, and 100 degrees C (respectively). Inactivation rates, as determined by enzyme activity measurements, were measured at 3, 45, and 89 MPa. Half-lives of P. strain ES4, P. furiosus, and T. aquaticus DNA polymerases increased from 5.0, 6.9, and 5.2 minutes (respectively) at 3 MPa to 12, 36, and 13 minutes (respectively) at 45 MPa. A pressure of 89 MPa further increased the half-lives of P. strain ES4 and T. aquaticus DNA polymerases to 26 and 39 minutes, while the half-life of P. furiosus DNA polymerase did not increase significantly from that at 45 MPa. The decay constant for P. strain ES4 and T. aquaticus polymerases decreased exponentially with increasing pressure, reflecting an observed change in volume for enzyme inactivation of 61 and 73 cm3/mol, respectively. Stabilization by pressure may result from pressure effects on thermal unfolding or pressure retardation of unimolecular inactivation of the unfolded state. Regardless of the mechanism, pressure stabilization of proteins could explain the previously observed extension of the maximum temperature for survival of P. strain ES4 and increase the survival of thermophiles in thermally variable deep-sea environments such as hydrothermal vents.
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113
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Katz DL, Brunner RL, St Jeor ST, Scott B, Jekel JF, Brownell KD. Dietary fat consumption in a cohort of American adults, 1985-1991: covariates, secular trends, and compliance with guidelines. Am J Health Promot 1998; 12:382-90. [PMID: 10182090 DOI: 10.4278/0890-1171-12.6.382] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE To examine compliance with the guideline for dietary fat (i.e., 30% of total daily colonies) and covariates of fat intake in a cohort of adults using both 24-hour recall and food frequency questionnaire (FFQ). DESIGN Prospective, observational cohort study over 5 years. SETTING Community-based sample in Reno, Nevada. SUBJECTS Equal numbers of male and female, lean and overweight adults (n = 508), recruited from 1985 to 1986, of whom 348 completed all relevant surveys. MEASURES Subjects underwent repeated anthropometric measures and completed extensive surveys on diet, weight cycling, lifestyle, and physical activity. RESULTS Mean fat intake by 24-hour recall declined from 36.9% to 33.6% of calories between years 1 and 5 (p < .001), while calorie intake increased (p = .2). As measured by FFQ at year 2, mean fat intake was 39.1% of calories, and only 11.8% of subjects were in compliance with the guideline for dietary fat intake. Fat intake by FFQ at year 2 was statistically higher than by 24-hour recall in year 1 for lean women (p = .02) and lean men (p = .02), but not for the overweight of either gender, and was significantly higher than the year 5 24-hour recall for all categories of gender and weight (p < .001). Calorie intake, gender, and body mass index were significant in regression models that explained less than 10% of total variability in fat intake (r2 = .08; p < .01). CONCLUSIONS Compliance with the nationally recommended level of dietary fat intake was poor in this cohort, especially as measured by FFQ. Variability in fat intake was largely unexplained by host characteristics, including education. Further study is required to corroborate secular trends in population fat intake, elucidate the determinants of such intake, and identify cost-effective strategies for reducing the consumption of dietary fat.
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114
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Young C, Itoh Y, Johnson R, Garthwaite I, Miles CO, Munday-Finch SC, Scott B. Paxilline-negative mutants of Penicillium paxilli generated by heterologous and homologous plasmid integration. Curr Genet 1998; 33:368-77. [PMID: 9618588 DOI: 10.1007/s002940050349] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Using a monoclonal antibody based ELISA, 600 pAN7-1 plasmid-tagged mutants of Penicillium paxilli were screened for paxilline accumulation and one paxilline-negative mutant, YI-20, was identified. A molecular analysis of this mutant showed that pAN7-1 was inserted at a single site but was present as 4-6 copies arranged in a head-to-tail tandem array. Rescue of flanking sequences and analysis of the corresponding genomic region revealed that YI-20 has an extensive deletion at the site of pAN7-1 integration. Probing of a CHEF gel with the same sequences showed that associated with the deletion is a rearrangement of chromosome Va. Targeted gene disruption of wild-type sequences adjacent to the site where pAN7-1 inserted, resulted in the generation of two additional paxilline-negative mutants; both were single crossovers with deletions extending outside the region mapped. Neither of these new mutants had a rearrangement of chromosome Va, suggesting that deletion of genes on this chromosome is responsible for the paxilline-negative phenotype. Telomeric fingerprinting of genomic digests of P. paxilli, combined with pulsed-field gel electrophoresis of chromosomal DNA, established that there are a minimum of eight chromosomes in this fungus.
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115
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Robinson BW, Mukherjee SA, Davidson A, Morey S, Musk AW, Ramshaw I, Smith D, Lake R, Haenel T, Garlepp M, Marley J, Leong C, Caminschi I, Scott B. Cytokine gene therapy or infusion as treatment for solid human cancer. J Immunother 1998; 21:211-7. [PMID: 9610913 DOI: 10.1097/00002371-199805000-00007] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the induction of tissue-directed immune responses, cytokines tend to be released within the affected tissues. We used two strategies to expose tumor tissues to continuous high levels of cytokines: First, a vaccinia interleukin (IL)2 recombinant was injected directly intratumorally 3-weekly at 10(7) pfus/dose in six patients with the solid tumor malignant mesothelioma (MM). No virus excretion was detectable. At each cycle vaccinia-IL-2 mRNA (SQ [semi-quantitative] reverse transcription polymerase chain reaction) was maximal 24-72 h following injection reduced at 8 days and faded by 21 days. No tumor regression occurred. Second, based on the success of granulocyte macrophage colony-stimulating factor (GM-CSF) in gene transfer experiments, we conducted a study using continuous intratumoral GM-CSF infusion in eight patients with MM using a portable pump at doses of 10 micro/cg/24 h over 8 weeks. Systemic neutrophil agglutination and local catheter-related difficulties occurred. Two patients demonstrated tumor necrosis, one of whom had a marked progressive mononuclear cell infiltration of the tumor associated with a partial response (>50% reduction in tumor area). Murine studies using our MM model in CBA and BALB/C mice have demonstrated that B7-1 and allo-class I transfections induce strong tumor-specific cytotoxic T lymphocyte responses: GM-CSF, IL-12, and IL-2 induced mixed nonspecific plus specific responses, whereas B7-2 and class II transfections were not effective. We conclude that increased intratumoral cytokine concentrations can be generated using both gene transfer and cytokine infusion approaches; however, both have their limitations and, at this stage, have not produced dramatic antitumor effects in humans.
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116
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Wu AY, Schulman SJ, Marconi LA, Reilly CR, Scott B, Lo D. Protection against diabetes by MHC heterozygosity and reversal by cyclophosphamide. Cell Immunol 1998; 184:112-20. [PMID: 9630837 DOI: 10.1006/cimm.1998.1269] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In type I diabetes in both rodents and humans, genetic susceptibility to disease is strongly linked to MHC class II alleles. In some cases, however, certain class II alleles provide resistance to disease. To examine this effect in a well-defined system, we studied double transgenic mice expressing influenza hemagglutinin (HA) on pancreatic islet beta cells and an HA-specific TCR on CD4 T cells. On a susceptible B10.D2 background, 70% of double transgenic mice develop an early-onset spontaneous autoimmune diabetes. MHC heterozygosity induced variable protection from diabetes, depending on the specific nonpermissive allele, but insulitis was invariably present. Autoreactive T cells retained the ability to induce diabetes because cyclophosphamide treatment induced diabetes in 81% of young MHC(d/b) transgenic mice, although the effect was diminished in older mice. Most importantly, treatment induced higher IFN-gamma/IL-4 ratios among CD4 T cells, suggesting a strong shift toward Th1 development, perhaps through direct effects on patterns of gene expression in CD4 T cells.
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MESH Headings
- Animals
- Autoimmune Diseases/genetics
- Autoimmune Diseases/immunology
- Autoimmune Diseases/prevention & control
- Base Sequence
- CD4-Positive T-Lymphocytes/drug effects
- CD4-Positive T-Lymphocytes/immunology
- Cyclophosphamide/pharmacology
- DNA Primers/genetics
- Diabetes Mellitus, Type 1/genetics
- Diabetes Mellitus, Type 1/immunology
- Diabetes Mellitus, Type 1/prevention & control
- Genes, MHC Class II
- Hemagglutinin Glycoproteins, Influenza Virus/genetics
- Heterozygote
- Humans
- Interferon-gamma/genetics
- Interleukin-4/genetics
- Mice
- Mice, Inbred BALB C
- Mice, Inbred NOD
- Mice, Transgenic
- Polymerase Chain Reaction
- Receptors, Antigen, T-Cell/genetics
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117
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Mathison R, Lo P, Moore G, Scott B, Davison JS. Attenuation of intestinal and cardiovascular anaphylaxis by the salivary gland tripeptide FEG and its D-isomeric analog feG. Peptides 1998; 19:1037-42. [PMID: 9700752 DOI: 10.1016/s0196-9781(98)00048-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The effects of the submandibular gland peptide-T (SGP-T; Thr-Asp-Ile-Phe-Gly-Gly; TDIFEGG), its carboxy-terminal fragment (the tripeptide FEG; Phe-Glu-Gly), and the D-isomeric analog (feG) on intestinal and cardiovascular anaphylactic reactions were studied. The tripeptides, FEG and feG, when administered intravenously or orally to egg albumin-sensitized Hooded Lister or Sprague-Dawley rats 30 min prior to challenge with the antigen, totally prevented the disruption of intestinal motility and the development of anaphylaxis provoked diarrhea and inhibited anaphylactic hypotension by 66%. Submandibular gland peptides participate in the regulation of systemic inflammatory reactions, and the D-amino acid tripeptide, feG, is a potent, orally active anti-anaphylactic agent.
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118
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Mathison R, Tan D, Oliver M, Befus D, Scott B, Davison JS. Submandibular gland peptide-T (SGP-T) inhibits intestinal anaphylaxis. Dig Dis Sci 1997; 42:2378-83. [PMID: 9398820 DOI: 10.1023/a:1018847608184] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A novel peptide, submandibular gland peptide-T (SGP-T), which reduces allergen-induced hypotension, was examined for effects on intestinal anaphylaxis. Hooded-Lister rats were sensitized to egg albumin and prepared for the measurement of in vivo myoelectric activity of the jejunum. The disruption of migrating myoelectric complexes (MMCs) that occurs upon intraluminal, duodenal challenge with antigen of sensitized rats was inhibited by 75% upon intravenous treatment with 100 micrograms/kg of SGP-T. In addition, SGP-T reduced the number of rats experiencing anaphylactic diarrhea and disrupted MMCs, but the peptide did not alter antigen-provoked release of rat mast cell protease II. The mechanism of action of SGP-T remains to be determined, but it apparently does not act directly on mast cells to exert its antianaphylactic action. These results emphasize that modulation of immediate hypersensitivity reactions is only one of several gastrointestinal activities that are affected by growth factors and peptides released from salivary glands.
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119
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Scott B. Impact of managed care in pharmacy. Pharmacotherapy 1997; 17:155S-158S. [PMID: 9322883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Implementation of managed care results in decreased reimbursement, decreased use of specialty services, and consolidation of providers. With these changes, pharmacy services have been affected in all settings. However, pharmacists do have opportunities to implement change in this new health care environment. Employee compensation usually represents over half of hospital expenses and is therefore often the target of efforts to decrease costs. For pharmacy, this translates to increased automation and expanded technician responsibilities. In response to these changes, pharmacists have broadened their scope of responsibility to improve drug use, with the goal of decreasing drug-related hospitalizations and providing quality care at a reasonable cost.
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120
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Itoh Y, Scott B. Effect of de-phosphorylation of linearized pAN7-1 and of addition of restriction enzyme on plasmid integration in Penicillium paxilli. Curr Genet 1997; 32:147-51. [PMID: 9294263 DOI: 10.1007/s002940050259] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
As part of a study to investigate the pathways of plasmid pAN7-1 integration in Penicillium paxilli, a molecular analysis of 90 different integration events was carried out. Twenty out of forty five integration events analyzed from transformants obtained without the addition of restriction enzyme to the transformation reaction mixture were single-copy integrations, whereas the remaining 25 were tandem-repeat integrations. The addition of restriction enzyme resulted in a shift in this ratio in favour of single-copy integration events. Analysis of the 33 tandem-repeat integration events showed that the orientation of the plasmid copies was not random, with 88% organized as tandem head-to-tail arrays. De-phosphorylation of linearized pAN7-1 did not affect the frequency with which multiple copies were integrated. This suggests that the predominant mechanism for the generation of tandem repeats in P. paxilli is by homologous recombination rather than in vivo ligation of linearized plasmids.
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Marzo AL, Fitzpatrick DR, Robinson BW, Scott B. Antisense oligonucleotides specific for transforming growth factor beta2 inhibit the growth of malignant mesothelioma both in vitro and in vivo. Cancer Res 1997; 57:3200-7. [PMID: 9242450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Transforming growth factor beta (TGF-beta) is a potent growth-regulatory and immunomodulatory cytokine that exerts a diverse range of effects on many types of cells. High levels of TGF-beta are produced by several human and mouse malignant mesothelioma (MM) cell lines, and it is known to act as a growth factor for these cells. Antisense oligonucleotides (ODNs), targeted against specific TGF-beta mRNA, were used to block TGF-beta production from MM cells in vitro and in vivo. TGF-beta antisense ODNs were encapsulated in liposomes and transfected into MM cells or delivered intratumorally. TGF-beta2 mRNA levels, assessed by semiquantitative PCR, and TGF-beta2 protein secretion were reduced after TGF-beta2 antisense ODN transfection. MM cell proliferation, assessed by tritiated thymidine uptake, was specifically inhibited by both TGF-beta1- and TGF-beta2-specific antisense ODNs. In vivo administration of TGF-beta2 antisense ODNs, delivered locally, reduced tumor growth. These data show that the blockade of TGF-beta2 within this tumor reduces tumor growth and raises the possibility that TGF-beta2 antisense ODNs may be useful as a therapy for this disease.
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Scott B. Iron deficiency anaemia. Limit investigations if iron deficiency has no obvious cause. BMJ (CLINICAL RESEARCH ED.) 1997; 314:1759. [PMID: 9202512 PMCID: PMC2126877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Goddard WP, Murray I, Long RG, Scott B, Barton R, Salman M, Frewin R, Provan D, Henson A. Iron deficiency anaemia. BMJ : BRITISH MEDICAL JOURNAL 1997. [DOI: 10.1136/bmj.314.7096.1759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Harris NJ, Scott B, Smith TW. A further modification to the McBride procedure for hallux valgus using the Acufex tag system to reattach the adductor hallucis. Foot Ankle Int 1997; 18:57-8. [PMID: 9013118 DOI: 10.1177/107110079701800113] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Hägnebo C, Melin L, Larsen HC, Lindberg P, Lyttkens L, Scott B. The influence of vertigo, hearing impairment and tinnitus on the daily life of Menière patients. SCANDINAVIAN AUDIOLOGY 1997; 26:69-76. [PMID: 9186999 DOI: 10.3109/01050399709074978] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The aim of this questionnaire study was to investigate the impact of the symptoms in Meniere's disease on the daily life of patients and to analyse the relationships between the cardinal symptoms and environmental, emotional and activity factors. The study comprised 514 patients, recruited from two different sources. The results showed that vertigo, hearing impairment and tinnitus had a strong negative influence on the daily life of patients. Seventy-five percent of the subjects avoided certain everyday activities or situations because of the disease. However, the correlation between discomfort and reported satisfaction with life was moderate. Most of the subjects experienced premonitory symptoms of the attacks and 80% reported relations between external factors and vertigo attacks.
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