Search results for "TRANSFORMATION"
showing 10 items of 1634 documents
Metabolism of 3-hydroxychrysene by rat liver microsomal preparations
1990
3-Hydroxychrysene, a metabolite of the polycyclic aromatic hydrocarbon (PAH) chrysene, was metabolised by rat liver microsomal preparations obtained from Arochlor 1254-pretreated rats. Eight major metabolites were isolated by high performance liquid chromatography and characterised by u.v. spectroscopy and a variety of mass spectrometric techniques. The metabolites were unambiguously identified as 9-hydroxy-trans-1,2-dihydroxy-1,2-dihydrochrysene and 9-hydroxy-r-1,t-2,t-3,c-4-tetrahydroxy-1,2,3,4-tetrahydrochrysene and tentatively identified as 3-hydroxy-trans-5,6-dihydroxy-5,6-dihydrochrysene (since chrysene is a symmetrical molecule the 3- and 9-positions are equivalent), 9-hydroxy-trans-…
The inhibition by flavonoids of 2-amino-3-methylimidazo[4,5-f]quinoline metabolic activation to a mutagen: a structure-activity relationship study.
1997
The mutagenicity of 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) in Salmonella typhimurium TA98 is inhibited by flavonoids with distinct structure-antimutagenicity relationships (Edenharder, R., I. von Petersdorff I. and R. Rauscher (1993). Antimutagenic effects of flavonoids, chalcones and structurally related compounds on the activity of 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) and other heterocyclic amine mutagens from cooked food, Mutation Res., 287, 261-274). With respect to the mechanism(s) of antimutagenicity, the following results were obtained here. (1) 7-Methoxy- and 7-ethoxyresorufin-O-dealkylase activities in rat liver microsomes, linked to cytochrome P-450-dependent 1A1 and…
Molecular Pathways Involved in Prostate Carcinogenesis: Insights from Public Microarray Datasets
2012
PLoS one 7(11), e49831 (2012). doi:10.1371/journal.pone.0049831
Emotional labour and work engagement among nurses: examining perceived compassion, leadership and work ethic as stress buffers
2015
Aim The study examined whether three resources, that is, compassion, transformational leadership and work ethic feasibility, buffer against the negative effects of emotional labour on work engagement. Background Emotional labour is a common job stressor among nurses, but little is known about whether certain personal and work resources buffer against it in relation to work engagement. Revealing buffers of emotional labour would help organizations to design tailored interventions. Design Cross-sectional online survey conducted in 2014. Methods Participants were 3466 Finnish nurses. Hypotheses were tested via hierarchical moderated regression analyses. Results Higher emotional labour related …
Metabolism of apigenin by rat liver phase I and phase II enzymes and by isolated perfused rat liver
2004
The metabolism of apigenin, a low estrogenic flavonoid phytochemical, was investigated in rat using liver models both in vitro (subcellular fractions) and ex vivo (isolated perfused liver). In vitro, phase I metabolism led to the formation of three monohydroxylated derivatives: luteolin which was the major metabolite (K(m) = 22.5 +/- 1.5 microM; V(max) = 5.605 +/- 0.090 nmol/min/mg protein, means +/- S.E.M.), scutellarein, and iso-scutellarein. These oxidative pathways were mediated by cytochrome P450 monooxygenases (P450s). The use of P450 inhibitors and inducers showed that CYP1A1, CYP2B, and CYP2E1 are involved. In vitro studies of phase II metabolism indicated that apigenin underwent co…
Similar level of metabolic activation of benzo(a)pyrene in perfused rat lung and liver and protection of lung by liver in a combined perfusion system
1982
Abstract Irreversible binding of metabolically activated benzo(a)pyrene to DNA, RNA and protein proceeds by a different time course in perfused liver and lung of 5,6-benzoflavone-treated rats. Peak binding in liver is obtained after 15 min while binding in lung continuously increases over 120 min. Total irreversible binding per mg DNA or RNA is in the same order of magnitude in both organs. While binding in lung is lower at 15 min it exceeds binding in liver at 120 min. Binding per mg protein is higher in lung than in liver over the whole perfusion period. Introduction of a liver into the lung perfusion circuit decreases binding in lung. This protection effect is more pronounced when the li…
Oncogene transformation can induce tolerogenicity in murine macrophages after down-regulation of immunogenicity without altering major histocompatibi…
1993
In vitro studies on cell lines may allow analyses of the mechanisms of immunogenicity and tolerogenicity in cells. We used a model of oncogenic transformation of an established murine macrophage cell line and report here that one v-mos-transformed clone expressing unaltered high amounts of MHC class I and II antigens does not induce proliferation of unprimed T cells in primary mixed lymphocyte reactions, in sharp contrast to its non-transformed parental cells. Interestingly, this clone induces specific unresponsiveness, as revealed by the lack of responsiveness of MHC-specific T cells when subsequently exposed to the pertinent MHC alloantigens in immunogenic form but unaltered MHC-third par…
Multi-step metabolic activation of benzene. Effect of superoxide dismutase on covalent binding to microsomal macromolecules, and identification of gl…
1980
Abstract Incubation of [ 14 C]benzene or [ 14 C]phenol with liver microsomes from untreated rats, in the presence of a NADPH-generating system, gave rise to irreversible binding of metabolites to microsomal macromolecules. For both substrates this binding was inhibited by more than 50% by addition of superoxide dismutase to the incubation mixtures. The decrease in binding was compensated for by accumulation of [ 14 C]hydroquinone, indicating superoxide-mediated oxidation of hydroquinone as one step in the activation of benzene to metabolites binding to microsomal macromolecules. Since our previous work had shown that binding occurred mainly with protein rather than ribonucleic acid and was …
Constitutive activation of JAK2 in mammary epithelium elevates Stat5 signalling, promotes alveologenesis and resistance to cell death, and contribute…
2011
Signalling through the janus kinase (JAK)/signal transducer and activator of transcription (Stat) pathway is required at different stages of mammary gland development, and this pathway is frequently hyper-activated in cancer, including tumours of the breast. Stats 3, 5 and 6 have important roles in the differentiation and survival of mammary alveolar cells, but somewhat paradoxically, both Stat3 and 5 can have oncogenic activity in the mammary gland. Constitutive activation of JAK2 could be anticipated to result in hyper-activation of Stats 1, 3, 5 and 6 with concomitant cell transformation, although the outcome is difficult to envisage, particularly since Stats 3 and 5 play opposing roles …
Transformational Leadership, Task-Involving Climate, and Their Implications in Male Junior Soccer Players: A Multilevel Approach
2019
Despite the well-known positive consequences of transformational coaches in sport, there is still little research exploring the mechanisms through which coaches&rsquo