Genetic association between common beta-2 adrenoreceptor polymorphism and asthma severity in school-age children

Recent studies have suggested that polymorphism of the beta-2 adrenergic receptor (β2AR) gene at codon 16 affect an individual’s airway responsiveness. This study aimed to evaluate the association between beta-2 adrenoreceptor genotypes at position 16 and asthma severity among 59 school-aged children. They were divided into two groups: control group including 19 healthy children and 40 asthmatic children as the study group. The study group was also divided into 20 mild asthmatic children and the remaining 20 patients suffered from severe asthma. Blood samples were collected from Chest Department, Pediatrics Hospital, Ain Shams University, from February 2008 to March 2009. Molecular analysis was performed at Science Faculty, Ain Shams University, Cairo, Egypt. Venous blood sample were collected and genotyping of β2AR gene polymorphism at position 16 was identified by polymerase chain reaction– restriction fragment length polymorphism analysis, using the NcoI restriction enzyme. We found a highly statistically significant difference of polymorphisms’ distribution of β2AR gene at codon 16 among asthmatic patients and control subjects (χ2= 11.904; P = 0.0026), also among severe asthmatics and mild/moderate asthmatics(χ2 =10.108;P=0.0064). There was a strong association of heterozygous Arg16Gly of b2AR with severe asthmatics rather than that in control subjects (70% vs. 5.3%, P < 0.001), with odd ratio (OR) 42 (95% confidence interval (CI): 4.520–390.297), the highest OR in heterozygous Arg16Gly (42) suggests a dominant mode of action of the heterozygous Arg16Gly in development of asthma severity. So, we concluded that heterozygous Arg16Gly of b2AR gene appeared to be an important genetic factor in the expression of asthma severity. Keywords: Asthma; Beta-2 adrenoceptor gene polymorphisms; Arginine 16/Glycin

Optimization of industrial production of rifamycin B by Amycolatopsis mediterranei. IV. Production in the fermentor

Optimization of the physical and physiological parameters of the fermentation process using the gene amplified variant of Amycolatopsis mediterranei (NCH) was carried out. Optimization of the physical parameters by controlling the pH at 6.5 for 3 days then at 7 thereafter and by adjustment of aeration at 1 vvm for 3 days then controlling the dissolved oxygen (DO) at 30% saturation increased the yield from 9.77 to 11.96 (22%) and 13.39 g/l (37%), respectively. Replacing 12% glucose in the fermentation medium (F2m1) with 5% glucose syrup (F2m3 medium) resulted in a drop of the yield from 9.77 to 7.5 g/l, while further addition of another 5% glucose syrup at day 4 increased the yield from 7.5 to 13.81 g/l (84%); with a further increase in the yield to 14.25 g/l (90%) upon controlling DO. Whereas, the combined addition of 0.1% yeast extract at day 2 to F2m3 medium along with the addition 5% glucose syrup at day 4 increased the yield from 7.5 to 15.35 g/l (105%); with a further increase in the yield to 16.3 g/l (117%) upon controlling DO. The fed-batch addition of both 3% soytone at day 3 and 5% of glucose syrup at day 4 to F2m3 medium increased the yield from 7.5 to 16.2 g/l (116%) and by extending the fermentation period to 10 days the yield reached 17.9 g/l (139%). Upon applying all optimum physical and physiological conditions in the fermentor the yield increased from 7.5 to 17.43 g/l in 8 days (132%) and by extending the fermentation period to 10 days the yield reached 19.4 g/l (159%). Further process optimization by examination and analysis of the kinetics of the process would most certainly further increase the yield and quantitatively define the process to a level that could be tested on a pilot scale. Key Words: Rifamycin B, fermentor, biotechnology, Amycolatopsis mediterranei, optimization, fed-batch and process development African Journal of Biotechnology Vol.3(9) 2004: 432-44

Optimization of industrial production of rifamycin B by Amycolatopsis mediterranei. II. The role of gene amplification and physiological factors in productivity in shake flasks

Amplification of gene expression of the most productive colony type of Amycolatopsis mediterranei strain N1 under stress of chloramphenicol, resulted in isolation of a variant NCH with productivity of 2.56 g/l compared to 1.15 g/l by the parent strain N1 (2.2 fold increase). This amplified variant has a further advantage of reduced variation in colony morphology with predominance of the most productive colony type. Using variant NCH, modification of the fermentation medium F1 by the addition of 0.1% yeast extract or the use of 1.8% KNO3 resulted in 3.8 and 5.8-fold increase in productivity, respectively, compared to strain N1. When the F1 medium was replaced by a new medium F2 containing soytone, instead of the particulate constituents (peanut meal and soybean meal) the yield by variant NCH reached 7.85 g/l (6.8-fold increase). Modification of the F2 medium by addition of glycerol or the replacement of glucose by glucose syrup decreased rifamycin B production. Changing the concentration of soytone increased the yield only slightly while replacing it with peptone or tryptone or the addition of 1 % corn steep liquor failed to increase the yield. On the other hand, the addition of 0.1 % yeast extract, or the replacement of 0.6% (NH4)2SO4 by 1.2% KNO3 or 0.4% NH4NO3, to F2 medium led to 8.2, 10.2 and 10.4-fold increase in productivity, respectively, compared to productivity of strain N1 in F1 medium. The change in the concentrations of either MgSO4 or CaCO3, the use of different types of antifoams and the use of higher concentrations of sodium diethyl barbiturate did not significantly influence the yield. These collective optimization attempts thus resulted in a 10.4-fold increase in productivity, from 1.15 to 11.99 g/l. Key words: Rifamycin B, fermentation, biotechnology, Amycolatopsis mediterranei, optimization, gene amplification, physiological factors. African Journal of Biotechnology Vol.3(5) 2004: 273-28

Optimization of industrial production of rifamycin B by Amycolatopsis mediterranei. III. Production in fed-batch mode in shake flasks

Optimization of the fermentation process using the gene amplified variant of Amycolatopsis mediterranei, NCH, in the fermentation medium F2 was carried out by the application of fed-batch regime. The addition of 12% glucose alone at day 4 or simultaneously with 0.1% yeast extract at day 2 led to an increase in the yield of rifamycin B by 46% and 57%, respectively. The application of fed-batch regime together with replacing (NH4)2SO4 with the better yielding inorganic nitrogen sources NH4NO3 or KNO3 (F2m1 and F2m2 media, respectively) increased the production of rifamycin B. The use of F2m1 medium alone or with an additional 12% glucose added at day 4 increased the yield by 53% and 120%, respectively. However, further addition of 0.1% yeast extract led to an increase in the yield by only 63%. The addition of 3% soytone or 0.05% NH4NO3 to F2m1 at day 3 increased the yield by 72% and 61%, respectively, compared to productivity in F2 medium. The use of F2m2 medium increased the yield by 50%. The addition of 12% glucose at day 4 or of 0.1% yeast extract at day 2 to F2m2 medium led to an increase in the yield by 119 and 55%, respectively, compared to F2 medium. However, when both 12% glucose and 0.1% yeast extract were added at similar scheduled times only 64% increase in the yield occurred. By applying the three most effective optimization regimes determined using variant NCH with F2m2 medium on a standard rifamycin B producing strain, Nocardia mediterranei ATCC 21789, a similar pattern of increase in the antibiotic yield was observed. Thus, the use of F2m2 instead of F2 medium either alone or with an additional 12% glucose added at day 4 increased the yield by 36 and 75%, respectively, whereas the addition of 0.1% yeast extract to F2 medium increased the yield by 15%. In conclusion, the application of fed-batch technique with the optimum modifications of the medium constituents increased rifamycin B production by variant NCH to a maximum of 17.17 g/l compared to a yield of 5.3 g/l by the tested standard strain under the same conditions. The increase in rifamycin B production using the standard strain confirms the usefulness of the tested medium modifications in the improvement of rifamycin B production and its possible application in fermentations using other rifamycin B producer strains and also shows the superiority of variant NCH as a producer, when compared to the standard strain. Key words: Rifamycin B, fermentation, biotechnology, Amycolatopsis mediterranei, optimization, fed-batch and physiological factors. African Journal of Biotechnology Vol.3(8) 2004: 387-39

Optimization of industrial production of rifamycin B by Amycolatopsis mediterranei. I. The role of colony morphology and nitrogen sources in productivity

A systematic approach to process optimization for production of rifamycin B was applied to a strain of Amycolatopsis mediterranei. Examination of the growth revealed 6 different morphologically distinct colonies on Bennett's agar medium. Rifamycin B production in shake flasks by the six different colony types ranged between 0.5 and 1.2 g/l. There was a clear correlation between the colony morphology and rifamycin B productivity. The highest yield of rifamycin B (1.03-1.2 g/l) was obtained by using the orange-red colored colonies, rosette shaped, devoid of hollow center and 2-3 mm in diameter. Variability in colony morphology, however, remained and the appropriate colonies had to be picked up for preparing the inoculum of each experiment. Addition of yeast extract to the fermentation medium at different times increased rifamycin B production. The highest antibiotic production was obtained upon the addition of 0.1% yeast extract after 2 days of incubation, where the yield increased from 1.15 to 1.95 g/l (70%). The use of 1.8% KNO3 in the fermentation medium, instead of 0.96% (NH4)2SO4, markedly increased rifamycin B production from 1.15 to 2.92 g/l (154%). It was also observed, upon microscopical examination, that KNO3 decreased branching and fragmentation of the mycelia in the fermentation medium. Keywords: Rifamycin B; fermentation; biotechnology; Amycolatopsis mediterranei; strain selection. African Journal of Biotechnology Vol.3(5) 2004: 266-27

Tissue p53-induced glycolysis and apoptosis regulator (TIGAR) is associated with oxidative stress in benign and malignant colorectal lesions

Background: Colorectal cancer (CRC) is the fourth leading cause of cancer-mortality worldwide. Tissue p53-induced glycolysis and apoptosis regulator gene (TIGAR) has an important role in cellular glycolysis and acts as an oncogene.Objectives: We aimed to investigate the diagnostic utility of TIGAR in both CRC and benign bowel deceases.Methods: One-hundred-eighty tissue samples were recruited and classified into 3 groups: group (1) 60 CRC samples from the tumor mass of colorectal cancer patients, group (2), 60 non-neoplastic colorectal tissue samples and group (3), 60 benign bowel lesions samples (ulcerative-colitis, Chron’s disease, adenoma, and familial adenomatous polyposis). The expressions of tissue mRNA and protein levels of TIGAR were determined. Levels of malondialdehyde and reduced glutathione were also measured.Results: Our results showed upregulated expressions of TIGAR gene and protein levels in CRC tissues and benign colonic lesions compared to non-tumor tissues (p < 0.0001). Their levels were higher in inflammatory bowel diseases compared to non-inflammatory benign lesions. There were significant relations among TIGAR expression, protein levels, TNM staging, and the presence of metastasis (p<0.0001). ROC curve analysis showed that TIGAR mRNA expression and its protein can discriminate between CRC and benign lesions and between benign bowel disease and controls.Conclusions: To the best of our knowledge this is the first study to assess the level of TIGAR in different benign bowel diseases. TIGAR might be involved in the pathogenesis of benign and malignant bowel diseases and could be a potential biomarker for diagnosis

Molecular Profiling Reveals Biologically Discrete Subsets and Pathways of Progression in Diffuse Glioma

Therapy development for adult diffuse glioma is hindered by incomplete knowledge of somatic glioma driving alterations and suboptimal disease classification. We defined the complete set of genes associated with 1,122 diffuse grade II-III-IV gliomas from The Cancer Genome Atlas and used molecular profiles to improve disease classification, identify molecular correlations, and provide insights into the progression from low- to high-grade disease. Whole-genome sequencing data analysis determined that ATRX but not TERT promoter mutations are associated with increased telomere length. Recent advances in glioma classification based on IDH mutation and 1p/19q co-deletion status were recapitulated through analysis of DNA methylation profiles, which identified clinically relevant molecular subsets. A subtype of IDH mutant glioma was associated with DNA demethylation and poor outcome; a group of IDH-wild-type diffuse glioma showed molecular similarity to pilocytic astrocytoma and relatively favorable survival. Understanding of cohesive disease groups may aid improved clinical outcomes

CD8+ lymphocytes/ tumour-budding index: an independent prognostic factor representing a ‘pro-/anti-tumour' approach to tumour host interaction in colorectal cancer

BACKGROUND: The tumour-host interaction at the invasive front of colorectal cancer, including the epithelial-mesenchymal transition and its hallmark 'tumour budding', is an important area of investigation in terms of prognosis. The aim of this study was to determine the prognostic impact of a 'pro-/anti-tumour' approach defined by an established 'pro-tumour' (tumour budding) and host-related 'anti-tumour' factor of the adaptive immunological microenvironment (CD8+ lymphocytes). METHODS: Double immunostaining for CK22/CD8 on whole tissue sections (n=279; Cohort 1) and immunohistochemistry for CD8+ using tissue microarrays (n=191; Cohort 2) was carried out. Tumour buds, CD8+ and CD8+ T-lymphocytes : tumour buds indices were evaluated per high-power field. RESULTS: In Cohort 1, a low-CD8+/ buds index was associated with lymph node metastasis (P>0.001), vascular invasion (P=0.009), worse survival in univariate (P>0.001) and multivariable (P>0.001) analysis, and furthermore in lymph node-negative patients (P=0.002). In Cohort 2, the CD8+/ buds index was associated with T stage (P>0.001), N stage (P=0.041), vascular invasion (P=0.005) and survival in patients with TNM stage II (P=0.019), stage III (P=0.004), and adjuvantly untreated (P=0.009) and treated patients (P>0.001). CONCLUSION: The CD8+ lymphocyte : tumour-budding index is an independent prognostic factor in colorectal cancer and a promising approach for a future prognostic score for patients with this disease

Reirradiation of head and neck cancer focusing on hypofractionated stereotactic body radiation therapy

Reirradiation is a feasible option for patients who do not otherwise have treatment options available. Depending on the location and extent of the tumor, reirradiation may be accomplished with external beam radiotherapy, brachytherapy, radiosurgery, or intensity modulated radiation therapy (IMRT). Although there has been limited experience with hypofractionated stereotactic radiotherapy (hSRT), it may have the potential for curative or palliative treatment due to its advanced precision technology, particularly for limited small lesion. On the other hand, severe late adverse reactions are anticipated with reirradiation than with initial radiation therapy. The risk of severe late complications has been reported to be 20- 40% and is related to prior radiotherapy dose, primary site, retreatment radiotherapy dose, treatment volume, and technique. Early researchers have observed lethal bleeding in such patients up to a rate of 14%. Recently, similar rate of 10-15% was observed for fatal bleeding with use of modern hSRT like in case of carotid blowout syndrome. To determine the feasibility and efficacy of reirradiation using modern technology, we reviewed the pertinent literature. The potentially lethal side effects should be kept in mind when reirradiation by hSRT is considered for treatment, and efforts should be made to minimize the risk in any future investigations