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111.
Ebrahimi B Valojerdi MR Eftekhari-Yazdi P Baharvand H 《Zygote (Cambridge, England)》2012,20(2):103-115
To determine the ultrastructural changes of sheep cumulus-oocyte complexes (COCs) following different methods of vitrification, good quality isolated COCs (GV stage) were randomly divided into the non-vitrified control, conventional straw, cryotop and solid surface vitrification groups. In both conventional and cryotop methods, vitrified COCs were respectively loaded by conventional straws and cryotops, and then plunged directly into liquid nitrogen (LN2); whereas in the solid surface group, vitrified COCs were first loaded by cryotops and then cooled before plunging into LN2. Post-warming survivability and ultrastructural changes of healthy COCs in the cryotop group especially in comparison with the conventional group revealed better viability rate and good preservation of the ooplasm organization. However in all vitrification groups except the cryotop group, mitochondria were clumped. Solely in the conventional straw group, the mitochondria showed different densities and were extremely distended. Moreover in the latter group, plenty of large irregular connected vesicles in the ooplasm were observed and in some parts their membrane ruptured. Also, in the conventional and solid surface vitrification groups, cumulus cells projections became retracted from the zona pellucida in some parts. In conclusion, the cryotop vitrification method as compared with other methods seems to have a good post-warming survivability and shows less deleterious effects on the ultrastructure of healthy vitrified-warmed sheep COCs. 相似文献
112.
Lithium preparations are commonly used drug in treating mental disorders and bipolar diseases, but metal's cytotoxic mechanisms have not yet been completely understood. In this study, we investigated the cytotoxic mechanisms of lithium in freshly isolated rat hepatocytes. Lithium cytotoxicity were associated with reactive oxygen species (ROS) formation and collapse of mitochondrial membrane potential and cytochrome c release into the hepatocyte cytosol. All of the mentioned lithium-induced cytotoxicity markers were significantly (P?0.05) prevented by ROS scavengers, antioxidants, mitochondrial permeability transition pore sealing agents and adenosine triphosphate generators. Hepatocyte glutathione (GSH) was also rapidly oxidized and GSH-depleted hepatocytes were more resistant to lithium-induced oxidative stress markers. This suggests that lithium is activated by GSH. Our results also showed that CYP2E1 is involved in lithium oxidative stress mechanism. Lithium cytotoxicity was also associated with mitochondrial injuries initiated by increased ROS formation resulted from metal-CYP2E1 destructive interaction or metal-induced disruption of mitochondrial electron transfer chain. Methyl donors such as betaine, methionine, or folic acid prevented lithium cytotoxicity, and this suggests that this metal is detoxified by phase II metabolic methylation. In conclusion lithium-induced cytotoxicity could be attributed to oxidative stress and mitochondrial dysfunction. 相似文献
113.
114.
A C-terminal sequence in the guanine nucleotide exchange factor Sec7 mediates Golgi association and interaction with the Rsp5 ubiquitin ligase 总被引:1,自引:0,他引:1
Dehring DA Adler AS Hosseini A Hicke L 《The Journal of biological chemistry》2008,283(49):34188-34196
Arf GTPases control vesicle formation from different intracellular membranes and are regulated by Arf guanine nucleotide exchange factors (GEFs). Outside of their conserved catalytic domains, known as Sec7 domains, little is known about Arf GEFs. Rsp5 is a yeast ubiquitin ligase that regulates numerous membrane trafficking events and carries a C2 domain that is specifically required for trans-Golgi network to vacuole transport. In a screen for proteins that interact with the Rsp5 C2 domain we identified Sec7, the GEF that acts on Golgi-associated Arfs. The Rsp5-Sec7 interaction is direct, occurs in vivo, and is conserved among mammalian Rsp5 and Sec7 homologues. A 50-amino acid region near the Sec7 C terminus is required for Rsp5 binding and for normal Sec7 localization. Binding of Sec7 to Rsp5 is dependent on the presence of the phosphoinositide 3-kinase Vps34, suggesting that phosphatidylinositol 3-phosphate (PI(3)P) plays a role in regulating this interaction. Overexpression of Sec7 significantly suppresses the growth and sorting defects of an rsp5 C2 domain point mutant. These observations identify a new functional region within the Sec7/BIG family of Arf GEFs that is required for trans-Golgi network localization. 相似文献
115.
Inter-comparison of models to estimate radionuclide activity concentrations in non-human biota 总被引:1,自引:0,他引:1
Beresford NA Barnett CL Brown JE Cheng JJ Copplestone D Filistovic V Hosseini A Howard BJ Jones SR Kamboj S Kryshev A Nedveckaite T Olyslaegers G Saxén R Sazykina T Vives I Batlle J Vives-Lynch S Yankovich T Yu C 《Radiation and environmental biophysics》2008,47(4):491-514
A number of models have recently been, or are currently being, developed to enable the assessment of radiation doses from ionising radiation to non-human species. A key component of these models is the ability to predict whole-organism activity concentrations in a wide range of wildlife. In this paper, we compare the whole-organism activity concentrations predicted by eight models participating within the IAEA Environmental Modelling for Radiation Safety programme for a range of radionuclides to terrestrial and freshwater organisms. In many instances, there was considerable variation, ranging over orders of magnitude, between the predictions of the different models. Reasons for this variability (including methodology, data source and data availability) are identified and discussed. The active participation of groups responsible for the development of key models within this exercise is a useful step forward in providing the transparency in methodology and data provenance required for models which are either currently being used for regulatory purposes or which may be used in the future. The work reported in this paper, and supported by other findings, demonstrates that the largest contribution to variability between model predictions is the parameterisation of their transfer components. There is a clear need to focus efforts and provide authoritative compilations of those data which are available. 相似文献
116.
Mojtaba Tabatabaei Yazdi Younes Ghasemi Abdollah Ghasemian Shadman Shokravi Hossein Niknahad Mohsen Amini Ali Dehshahri Mohammad Ali Faramarzi 《World journal of microbiology & biotechnology》2005,21(6-7):811-814
Summary The bioconversion of hydrocortisone by a locally isolated strain of cyanobacterium Fischerella ambigua PTCC 1635 was investigated. Fischerella ambigua had not been previously examined for this potential. The fermentation led to production of 11β,17α, 20β, 21-tetrahydroxypregn-4-en-3-one and 11β-hydroxyandrost-4-en-3,17-dione. The metabolites were isolated and purified by chromatographic methods and identified using
instrumental analyses. 相似文献
117.
In this paper, the problem of identifying differentially expressed genes under different conditions using gene expression microarray data, in the presence of outliers, is discussed. For this purpose, the robust modeling of gene expression data using some powerful distributions known as normal/independent distributions is considered. These distributions include the Student’s t and normal distributions which have been used previously, but also include extensions such as the slash, the contaminated normal and the Laplace distributions. The purpose of this paper is to identify differentially expressed genes by considering these distributional assumptions instead of the normal distribution. A Bayesian approach using the Markov Chain Monte Carlo method is adopted for parameter estimation. Two publicly available gene expression data sets are analyzed using the proposed approach. The use of the robust models for detecting differentially expressed genes is investigated. This investigation shows that the choice of model for differentiating gene expression data is very important. This is due to the small number of replicates for each gene and the existence of outlying data. Comparison of the performance of these models is made using different statistical criteria and the ROC curve. The method is illustrated using some simulation studies. We demonstrate the flexibility of these robust models in identifying differentially expressed genes. 相似文献
118.
119.
Khashayar Afshari Nazgol-Sadat Haddadi Arvin Haj-Mirzaian Mohammad Hosein Farzaei Mohammad Mojtaba Rohani Freshteh Akramian Rozita Naseri Antoni Sureda Negar Ghanaatian Amir Hossein Abdolghaffari 《Journal of cellular physiology》2019,234(12):21519-21546
Flavonoids comprise a group of natural polyphenols consisting of more than 5,000 subtypes mostly existing in fruits and vegetables. Flavonoids consumption could potentially attenuate the incidence and recurrence risk of colorectal cancers through their antiperoxidative, antioxidant, and anti-inflammatory effects. In addition, these compounds regulate the mitochondrial function, balance the bacterial flora and promote the apoptosis process in cancerous cells. However, some previous data failed to show the effectiveness of flavonoids in reducing the risk of colorectal cancer. In this study, we have reviewed the efficacy of different flavonoids subtypes on the risk of colon cancer and molecular mechanisms involved in this process in both clinical and animal studies. In addition, we tried to elucidate the potential synergy between these compounds and current colorectal cancer treatments. 相似文献
120.
Shereen Hasan Ghamartaj Hosseini Marc Princivalle Ji-Cui Dong Daniela Birsan Cristina Cagide Ariane I de Agostini 《Biology of reproduction》2002,66(1):144-158
During the reproductive cycle, ovarian follicles undergo major tissue-remodeling involving vascular changes and proteolysis. Anticoagulant heparan sulfate proteoglycans (aHSPGs) are expressed by granulosa cells during the development of the ovarian follicle. The function of aHSPGs in the ovary is unknown, but they might be involved in proteolysis control through binding and activation of serine protease inhibitors. To identify functional interactions between aHSPGs and heparin-binding protease inhibitors in the follicle, we have coordinately localized aHSPGs, antithrombin III, protease nexin-1, and plasminogen activator inhibitor-1 in the rat ovary during natural and gonadotropin-stimulated cycles. Anticoagulant HSPGs were visualized by autoradiography of cryosections incubated with 125I-antithrombin III, and protease inhibitors were assessed by immunohistochemistry and Northern blot hybridization. Anticoagulant HSPGs were expressed in follicles before ovulation, were transiently decreased in postovulatory follicles, and were abundant in the corpus luteum, mainly on capillaries. Anticoagulant HSPGs were colocalized with protease nexin-1 in follicles from the early antral stage until ovulation, with antithrombin III in the preovulatory stage and after ovulation, and with plasminogen activator inhibitor-1 in the corpus luteum. These data demonstrate that aHSPGs are critically expressed in the ovary to interact sequentially with protease nexin-1, antithrombin III, and plasminogen activator inhibitor-1 during the cycle. The specificity of these inhibitors is shifted toward thrombin inhibition in the presence of heparin, suggesting that aHSPGs direct their action to control fibrin deposition in the follicle. The occupation of aHSPGs antithrombin-binding sites by mutant R393C antithrombin III, injected in the ovarian bursa, decreased ovulation efficiency, further supporting the involvement of aHSPGs in the ovulation process. 相似文献