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941.
Hesam Sarvghad-Moghaddam Mehdi Salimi Jazi Asghar Rezaei Mariusz Ziejewski 《Computer methods in biomechanics and biomedical engineering》2013,16(16):1846-1855
A parametric study was conducted to delineate the efficacy of personal protective equipment (PPE), such as ballistic faceshields and advanced combat helmets, in the case of a blast. The propagations of blast waves and their interactions with an unprotected head, a helmeted one, and a fully protected finite element head model (FEHM) were modeled. The biomechanical parameters of the brain were recorded when the FEHM was exposed to shockwaves from the front, back, top, and bottom. The directional dependent tissue response of the brain and the variable efficiency of PPE with respect to the blast orientation were two major results of this study. 相似文献
942.
943.
Uwe Rosenberger Mehdi Shakibaei Christoph Weise Peter Franke Klaus Buchner 《Journal of cellular biochemistry》1995,59(2):177-185
The treatment of isolated cell nuclei with citric acid was described as a method for separating inner and outer nuclear membrane. Using cell nuclei from bovine cerebral cortex, we can show that citric acid does not cause a separation of the two nuclear membranes, but extracts a specific set of proteins from the nuclei. The extraction of proteins is not just an effect of damaging the nuclear membrane or destructing the cytoskeleton, but rather a specific effect of citric acid treatment. One of the extracted proteins, chosen as a marker for the putative outer nuclear membrane fraction, has an apparent molecular weight of 145 kDa and is located in the nucleoplasm as shown by immunofluorescence microscopy. By sequencing tryptic peptides it was identified as RNA helicase A, an abundant nuclear protein assumed to participate in the processing of mRNA. © 1995 Wiley-Liss, Inc. 相似文献
944.
945.
S. Mehdi Belgnaoui Kimberly A. Fryrear Julius O. Nyalwidhe Xin Guo O. John Semmes 《The Journal of biological chemistry》2010,285(43):32897-32905
Infection with human T-cell leukemia virus induces cellular genomic instability mediated through the viral oncoprotein Tax. Here we present evidence that Tax undermines the cellular DNA damage response by sequestration of damage response factors. We show by confocal microscopy that Tax forms damage-independent nuclear foci that contain DNA-PK, BRCA1, and MDC1. Tax sequesters MDC1 to chromatin sites distinct from classic ionizing radiation-induced foci. The recruitment of MDC1 is competitive between the two foci. The N-terminal region of Tax is sufficient for foci localization, and the C-terminal half is critical for binding to MDC1 and recruitment of additional response factors. Tax expression and DNA damage response factor recruitment repressed the formation of ionizing radiation-induced Nbs1-containing foci. The Tax-induced “pseudo” DNA damage response results in phosphorylation and monoubiquitylation of H2AX, which is ablated by siRNA suppression of MDC1. These data support a model for virus-induced genomic instability in which viral oncogene-induced damage-independent foci compete with normal cellular DNA damage response. 相似文献
946.
<Emphasis Type="Italic">Gagea calcicola</Emphasis> (Liliaceae), a new species from southwestern Iran
A new species, Gagea calcicola (Liliaceae) is described and illustrated. It differs from G. reticulata (Pall.) Schult. & Schult. f. through having a compound umbelliform inflorescence and bulbils in the axil of the lower cauline
leaves. The new species is endemic to southwestern Iran. Its ecology, distribution and conservation status are discussed. 相似文献
947.
Intronic miR-211 assumes the tumor suppressive function of its host gene in melanoma 总被引:1,自引:0,他引:1
Levy C Khaled M Iliopoulos D Janas MM Schubert S Pinner S Chen PH Li S Fletcher AL Yokoyama S Scott KL Garraway LA Song JS Granter SR Turley SJ Fisher DE Novina CD 《Molecular cell》2010,40(5):841-849
When it escapes early detection, malignant melanoma becomes a highly lethal and treatment-refractory cancer. Melastatin is greatly downregulated in metastatic melanomas and is widely believed to function as a melanoma tumor suppressor. Here we report that tumor suppressive activity is not mediated by melastatin but instead by a microRNA (miR-211) hosted within an intron of melastatin. Increasing expression of miR-211 but not melastatin reduced migration and invasion of malignant and highly invasive human melanomas characterized by low levels of melastatin and miR-211. An unbiased network analysis of melanoma-expressed genes filtered for their roles in metastasis identified three central node genes: IGF2R, TGFBR2, and NFAT5. Expression of these genes was reduced by miR-211, and knockdown of each gene phenocopied the effects of increased miR-211 on melanoma invasiveness. These data implicate miR-211 as a suppressor of melanoma invasion whose expression is silenced or selected against via suppression of the entire melastatin locus during human melanoma progression. 相似文献
948.
Vahid Younesi Haleh Nikzamir Mehdi Yousefi Jalal Khoshnoodi Mohammd Arjmand Hodjatallah Rabbani Fazel Shokri 《Microbiology and immunology》2010,54(9):534-541
Viruses and other microorganisms express specific pathogen‐associated molecular patterns that are recognized by cell surface or endosome‐associated Toll‐like receptors (TLR). There are many examples of viruses that have developed strategies to modulate TLR signaling through the use of viral or cellular molecules. Epstein–Barr virus (EBV) has recently been found to display a complex interaction with TLR. The aim of this study was to asses the effect of EBV infection on proliferative capacity of TLR7/8 and 9 agonist and CD40 ligand (CD40L) in normal B lymphocytes. Our results demonstrate that EBV induces a significant inhibition in proliferative response to TLR7/8 (P < 0.004) and TLR9 (P < 0.000) agonists but not to CD40L stimulation in enriched human normal B lymphocytes. Similar inhibitory effect was also observed in B lymphocytes prestimulated with the TLR agonists, implying that the suppressive effect is not due to downregulation of TLR protein expression by EBV. EBV infection did not induce apoptosis and did not downregulate TLR7/8 mRNA expression in B lymphocytes. Our results suggest that EBV might be able to evade the immune system by modulation of the TLR signaling pathway. 相似文献
949.
Cell-type-specific roles of IGF-1R and EGFR in mediating Zn2+-induced ERK1/2 and PKB phosphorylation
Nihar R. Pandey George Vardatsikos Mohamad Z. Mehdi Ashok K. Srivastava 《Journal of biological inorganic chemistry》2010,15(3):399-407
Zn2+ exerts insulin-mimetic and antidiabetic effects in rodent models of insulin resistance, and activates extracellular-signal-regulated
kinases 1 and 2 (ERK1/2) and protein kinase B (PKB), key components of the insulin signaling pathway. Zn2+-induced signaling has been shown to be associated with an increase in the tyrosine phosphorylation of insulin receptor (IR),
as well as of insulin-like growth factor 1 receptor (IGF-1R) and epidermal growth factor receptor (EGFR) in several cell types.
However, the specific contribution of these receptor protein tyrosine kinases (R-PTKs) in mediating Zn2+-induced responses in a cell-specific fashion remains to be established. Therefore, using a series of pharmacological inhibitors
and genetically engineered cells, we have investigated the roles of various R-PTKs in Zn2+-induced ERK1/2 and PKB phosphorylation. Pretreatment of Chinese hamster ovary (CHO) cells overexpressing a human IR (CHO-HIR
cells) with AG1024, an inhibitor for IR protein tyrosine kinase (PTK) and IGF-1R-PTK, blocked Zn2+-induced ERK1/2 and PKB phosphorylation, but AG1478, an inhibitor for EGFR, was without effect in CHO cells. On the other
hand, both of these inhibitors were able to attenuate Zn2+-induced phosphorylation of ERK1/2 and PKB in A10 vascular smooth muscle cells. In addition, in CHO cells overexpressing tyrosine
kinase deficient IR, Zn2+ was still able to induce the phosphorylation of these two signaling molecules, whereas the insulin effect was significantly
attenuated. Furthermore, both Zn2+ and insulin-like growth factor 1 failed to stimulate ERK1/2 and PKB phosphorylation in IGF-1R knockout cells. Also, Zn2+-induced responses in CHO-HIR cells were not associated with an increase in the tyrosine phosphorylation of the IR β-subunit
and insulin receptor substrate 1 in CHO-HIR cells. Taken together, these data suggest that distinct R-PTKs mediate Zn2+-evoked ERK1/2 and PKB phosphorylation in a cell-specific manner. 相似文献
950.
Youfen Li Hong-Zhi Li Peiqing Hu Janice Deng Mohammad Mehdi Banoei Lokendra Kumar Sharma Yidong Bai 《Nucleic acids research》2010,38(6):1913-1921
Mitochondrial respiratory chain defects have been associated with various diseases and normal aging, particularly in tissues with high energy demands including skeletal muscle. Muscle-specific mitochondrial DNA (mtDNA) mutations have also been reported to accumulate with aging. Our understanding of the molecular processes mediating altered mitochondrial gene expression to dysfunction associated with mtDNA mutations in muscle would be greatly enhanced by our ability to transfer muscle mtDNA to established cell lines. Here, we report the successful generation of mouse cybrids carrying skeletal muscle mtDNA. Using this novel approach, we performed bioenergetic analysis of cells bearing mtDNA derived from young and old mouse skeletal muscles. A significant decrease in oxidative phosphorylation coupling and regulation capacity has been observed with cybrids carrying mtDNA from skeletal muscle of old mice. Our results also revealed decrease growth capacity and cell viability associated with the mtDNA derived from muscle of old mice. These findings indicate that a decline in mitochondrial function associated with compromised mtDNA quality during aging leads to a decrease in both the capacity and regulation of oxidative phosphorylation. 相似文献