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21.
The leaves of necrotic hybrid of wheat ( Triticum aestivum L.) exhibited high superoxide content associated with increased lipid peroxidation and membrane damage in earlier studies (Khanna-Chopra et al. 1998, Biochem Biophys Res Commun 248: 712–715; Dalal and Khanna-Chopra 1999, Biochem Biophys Res Commun 262: 109–112). In the present study, we investigated the activities of the antioxidant enzymes in the leaves of necrotic wheat hybrids, Kalyansona×C306 (K×C) and WL711×C306 (WL×C) and their parents at different developmental stages. The K×C hybrid exhibited more severe necrosis than WL×C. In K×C, superoxide dismutase (SOD) activity showed no increase over the parents, while WL×C showed an early increase, but it was possibly insufficient to scavenge increased superoxide. Activities of guaiacol peroxidase, ascorbate peroxidase and glutathione reductase were enhanced, while catalase exhibited a decrease in activity, with the appearance of visible necrosis in both the hybrids. The isozyme profile of the antioxidant enzymes was similar in the hybrids and their parents. One existing isoform of guaiacol peroxidase showed an early appearance in the hybrid and increased in intensity with the progression of necrosis. The results reveal a differential response of antioxidant enzymes in necrotic wheat hybrids as compared to their parents. The response differed in magnitude at developmental stages of the leaves, which might be related to the intensity of necrosis expressed by the hybrids. 相似文献
22.
Nocardia asteroides is an important opportunistic pathogen in immunocompromised hosts. The primary infection is usually in the lungs and is followed
by dissemination to other parts of the body. Primary subcutaneous infection with Nocardia asteroides has been reported rarely (three reports) and no such case has been reported in a renal transplant recipient. We describe
here a case of renal transplant recipient who developed primary subcutaneous infection with Nocardia asteroides within one and half years of the transplantation.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
23.
Using the model of glutathione (GSH) depletion, possible role of GSH in the maintenance of blood-brain barrier (BBB) integrity was evaluated in rats. Administration (ip) of GSH depletors, diethyl maleate (DEM, 1–4 mmol/kg), phorone (2–3 mmol/kg) and 2-cyclohexene-1-one (CHX, 1 mmol/kg), to male adults was found to deplete brain and liver GSH and increase the BBB permeability to micromolecular tracers (sodium fluorescein and [14C]sucrose) in a dose-dependent manner at 2h. However, BBB permeability to macromolecular tracers such as horseradish peroxidase and Evan's blue remained unaltered. It was also shown that observed BBB permeability dysfunction was associated with brain GSH depletion. A lower magnitude of BBB increase in rat neonates, as compared to adults, indicated a possible bigger role of GSH in the BBB function of mature brain. The treatment with N-acetylcysteine, methionine and GSH provided a partial to full protection against DEM-induced brain (microvessel) GSH depletion and BBB dysfunction; however, the treatment with -tocopherol, ascorbic acid and turmeric were not effective. Our studies showed that cerebral GSH plays an important role in maintaining the functional BBB integrity. 相似文献
24.
Kamal A Ramu R Khanna GB Saxena AK Shanmugavel M Pandita RM 《Bioorganic & medicinal chemistry letters》2004,14(19):4907-4909
New pyrrolobenzodiazepine-anthraquinone hybrids have been designed and synthesized, found to effectively bind to DNA and also exhibit cytotoxicity against many cancer cell lines 相似文献
25.
Maternal and perinatal morbidity and mortality rates are significantly higher in pregnancies complicated by preterm labor, pre-eclampsia and fetal growth restriction. Decades of research have not translated into a clear understanding of the underlying pathophysiologies or effective identification of women who are at high risk of developing these complications. Often the severity of these diseases does not correlate with the clinical symptoms, and current diagnostic methods are unable to accurately predict the conditions prior to clinical presentation. Though several potential markers have been proposed for each of these disorders, to date none have proven clinical utility. Emerging proteomic technology is only beginning to be employed in pregnancy research. A comprehensive analysis of gestational tissues can be expected to contribute to the elucidation of the complex molecular mechanisms of pregnancy and related complications. Comparison of the expression profiles of normal and pathogenic tissues and biofluids may also highlight novel candidate marker proteins that have so far remained undetected. More interestingly, rapidly evolving technologies using sophisticated bioinformatic tools are demonstrating their potential in disease diagnostics by using overall protein profiles to detect diseases. The clinical significance of these methodological advances is enormous. Early diagnosis together with improved understanding of underlying molecular mechanisms can enhance outcomes and increase effective management and therapeutic options. 相似文献
26.
Dudani R Chapdelaine Y Faassen Hv Hv Smith DK Shen H Krishnan L Sad S 《Journal of immunology (Baltimore, Md. : 1950)》2002,168(11):5737-5745
We evaluated CD8(+) T cell responses against the dominant CTL epitope, OVA(257-264), expressed by an acute (Listeria monocytogenes (LM) OVA) vs a chronic pathogen (Mycobacterium bovis bacillus Calmette-Guérin (BCG) OVA) to reveal the influence on CD8(+) T cell memory and consequent protection against a challenge with OVA-expressing tumor cells. Infection with lower doses of both pathogens resulted in stronger bacterial growth but weaker T cell memory indicating that memory correlates with pathogen dose but not with bacterial expansion. The CD8(+) T cell response induced by LM-OVA was helper T cell-independent and was characterized by a rapid effector response followed by a rapid, but massive, attrition. In contrast, BCG-OVA induced a delayed and weak response that was compensated for by a longer effector phase and reduced attrition. This response was partly dependent on CD4(+) T cells. CD8(+) T cell response induced by BCG-OVA, but not LM-OVA, was highly dependent on pathogen persistence to compensate for the weak initial CD8(+) T cell priming. Despite a stronger initial T cell response with LM-OVA, BCG-OVA provided more effective tumor (B16OVA) control at both local and distal sites due to the induction of a persistently activated acquired, and a more potent innate, immunity. 相似文献
27.
Hsp70 family member, mot-2/mthsp70/GRP75, binds to the cytoplasmic sequestration domain of the p53 protein 总被引:12,自引:0,他引:12
Wadhwa R Yaguchi T Hasan MK Mitsui Y Reddel RR Kaul SC 《Experimental cell research》2002,274(2):246-253
Hsp70 family member mot-2/mthsp70/GRP75/PBP74 was shown to bind to the tumor suppressor protein p53. In this study, by in vivo coimmunoprecipitation of mot-2 with p53 and its deletion mutants, the mot-2 binding site of p53 was mapped to its C-terminal amino acid residues 312-352, a region of p53 that includes its cytoplasmic sequestration domain. These data demonstrate that cytoplasmic sequestration and inactivation of p53 by mot-2 occurs by its binding to the cytoplasmic sequestration domain. Therefore, perturbation of mot-p53 interactions can be employed to abrogate cytoplasmic retention of wild-type p53 in tumors. 相似文献
28.
An Hsp70 family chaperone,mortalin/mthsp70/PBP74/Grp75: what,when, and where? 总被引:11,自引:0,他引:11
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Mortalin/mthsp70/PBP74/Grp75 (called mortalin hereafter), a member of the Hsp70 family of chaperones, was shown to have different subcellular localizations in normal and immortal cells. It has been assigned to multiple subcellular sites and implicated in multiple functions ranging from stress response, intracellular trafficking, antigen processing, control of cell proliferation, differentiation, and tumorigenesis. The present article compiles and reviews information on the multiple sites and functions of mortalin in different organisms. The relevance of its differential distributions and functions in normal and immortal cell phenotypes is discussed. 相似文献
29.
The gibberellins are one of the major groups of growth promoting hormones and are secondary metabolites of the fungus Fusarium moniliforme (Perfect stage: Gibberella fujikuroi). Sixteen strains of Fusarium from different geographical regions and different hosts were analysed for their ability to produce gibberellins (GA) and
for genetic relatedness by random amplified polymorphic DNA (RAPD). Range of gibberellin production varied between 28.9 to
600.0 mg g-1 dry weight of mycelium in different strains of Fusarium. RAPD analysis showed completely different pattern between high, moderate and low producing strains. High producers formed
nearly identical RAPD patterns, whereas the low and moderate producers gave heterologous amplification patterns. Since Fusarium pallidoroseum was in another group, it was possible to distinguish between different species of the genus Fusarium by RAPD. These investigations may find an application in the diagnosis of unknown Fusarium species and in distinguishing isolates of Gibberella fujikuroi within the section of Liseola.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
30.
Multiple sclerosis (MS) is an autoimmune disease affecting central nervous system white matter. The cause is unknown. It is thought that environmental factors trigger an immune response against myelin antigens in a genetically susceptible individual. The characteristic lesion of MS seen in the brain is a plaque, an area of inflammation, demyelination and glial reaction or ‘sclerosis’. Several recent studies have examined gene expression in MS plaques on a large scale using microarray technology. The involvement of immune-related genes has been confirmed, and many new genes not previously associated with MS lesions have been identified. Microarray studies are significant in identifying potential new targets for therapy. 相似文献