Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Journal of Thermal Biology 13 (1988), S. 143-147 
    ISSN: 0306-4565
    Schlagwort(e): BAT ; Exercise ; NA ; cold-acclimation ; cytochrome oxidase ; mitochondria ; oxygen consumption ; succinic dehydrogenase
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Histopathology 44 (2004), S. 0 
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Aims : To investigate the immunohistochemical expression of the catalytic and regulatory subunits of γ-glutamyl cysteine synthetase, i.e. glutamate-L-cysteine ligase (GLCL) in 274 invasive and in-situ breast carcinomas. GLCL is the rate-limiting enzyme in glutathione synthesis, which is one of the most important intracellular antioxidants participating in the detoxification reactions of several cytotoxic drugs.Methods and results : In the tumour cells GLCL reactivity was observed in 50% and 44% of the cases for the catalytic and the regulatory subunits, respectively. There was a statistically significant association between their expression (P = 0.002). Lobular invasive carcinomas expressed the catalytic and regulatory subunits more often than other tumours (P = 0.050 and P = 0.046, respectively). Also in-situ carcinomas expressed the catalytic subunit more often (P = 0.005). Tumours showing no immunoreactivity for the catalytic subunit had axillary metastases significantly more often (P = 0.013). Patients with tumours showing positivity for either subunit or both had a better survival (P = 0.037). No difference in survival could be observed between GCLC-positive or -negative cases in the subgroup receiving chemotherapy.Conclusions : Expression of the catalytic and regulatory subunits of GLCL is found in a substantial number of breast carcinomas and their expression is more pronounced in lobular invasive and in-situ carcinomas. Even though the overall expression of GLCL was associated with improved survival, no such effect was observed separately in the group receiving chemotherapy.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Endothelial nitric oxide synthase is strongly expressed in malignant mesothelioma but does not associate with vascular density or the expression of VEGF, FLK1 or FLT1 Aims: To investigate endothelial nitric oxide synthase (eNOS) expression in malignant mesothelioma and its association with expression of vascular endothelial growth factor (VEGF), its receptors FLK1 and FLT1, and vascular density. Methods and results: eNOS, VEGF, FLK1 and FLT1 were studied in 36 histological mesothelioma samples by immunohistochemistry. Two mesothelioma (M14K, M38K) and one non-neoplastic mesothelial cell line (MET-5A) were studied for eNOS mRNA expression by reverse transcriptase-polymerase chain reaction (RT-PCR). Vascular density was determined by staining the samples with an antibody to factor VIII. RT-PCR showed that mesothelioma cells synthesize eNOS in vitro. eNOS immunoreactivity was found in 32/36 (89%) tumours. VEGF, FLK1 and FLT1 expression was found in 17 (45%), 24 (69%) and 25 (71%) cases, respectively. FLK1 or FLT1 immunoreactivity was more often seen in epithelioid and biphasic mesotheliomas than in sarcomatoid ones (P=0.007 and P=0.011, respectively). There was a significant association between FLK1 and FLT1 immunoreactivity (P=0.032). No significant association was found between FLK1, FLT1, VEGF and eNOS immunoreactivity and vascular density. Conclusions: eNOS is strongly expressed in malignant mesothelioma. Since eNOS did not associate with VEGF, FLK1 or FLT1, its synthesis seems not to be regulated through VEGF in malignant mesothelioma as has been shown in non-neoplastic endothelial cells.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Histopathology 42 (2003), S. 0 
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Aims:  Tenascin-C is an extracellular matrix glycoprotein known to have anti-adhesive characteristics and to be expressed in various human malignant neoplasms. We hypothesized that the expression of tenascin-C would be increased in human malignant pleural mesothelioma, and its accumulation associated with the prognosis of the patients with this disease.Methods and results:  Thirty-seven cases of mesothelioma were studied by immunohistochemically using a monoclonal antibody against tenascin-C, and with a semiquantitative scoring system for tenascin-C in different areas of the tumours. In 10 selected cases tenascin-C mRNA in-situ hybridization was also analysed. Since transforming growth factor-beta (TGF-β) is known to induce both the synthesis of tenascin-C and the growth of mesotheliomas, an immunohistochemical analysis of TGF-β1, -β2 and -β3 was also performed. Normal pleura (n = 7) and metastatic pleural adenocarcinomas (n = 7) were used as controls. Tenascin-C protein was expressed in every histological subtype of malignant mesothelioma, being most prominent in the fibrotic stroma of a tumour, around tumour cells and at the invasive border, whereas tenascin-C mRNA was scarce in tumour cells. The patients with less immunohistochemical expression for tenascin-C tended to live longer (P = 0.028 by Fishers' exact probability test). All mesotheliomas showed positivity for at least one isoform of TGF-β.Conclusions:  In conclusion, high expression of tenascin-C protein in malignant pleural mesotheliomas may play a role in its invasive growth, and might serve as a prognostic marker of the disease.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Free Radical Biology and Medicine 9 (1990), S. 132 
    ISSN: 0891-5849
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie , Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    ISSN: 1569-8041
    Schlagwort(e): AML ; apoptosis ; etoposide ; γ-GCS ; glutathione ; oxidative stress
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background: Etoposide mediates its cytotoxicity by inducing apoptosis. Thus, mechanisms which regulate apoptosis should also affect drug resistance. Oxidants and antioxidants have been shown to participate in the regulation of apoptosis. We were interested in studying whether responsiveness of acute myeloblastic leukemia (AML) cells to etoposide is mediated by oxidative stress and glutathione levels. Patients and methods: Two subclones of the OCI/AML-2 cell line which are etoposide-sensitive (ES), and etoposide-resistant (ER), were established by the authors at the University of Oulu, and used as models. Assays for apoptosis included externalization of phosphatidylserine (as evidenced by annexin V binding), and caspase activation as indicated by cleavage of poly(ADP-ribose)polymerase (Western blotting). Peroxide formation was analyzed by flow cytometry. Glutathione and gamma-glutamylcysteine synthetase (γ-GCS) levels were determined spectrophotometrically and by Western blotting, respectively. Results: Etoposide-induced apoptosis was evident 12 hours after treatment in the ES subclone, but was apparent in the ER subclone only after 24 hours. The basal glutathione and γ-GCS levels were higher in the ER than the ES subclone. Etoposide increased peroxide formation in both subclones after 12-hour exposure. Significant depletion of glutathione was observed in the ES subclone during etoposide exposure, while glutathione levels were maintained in the ER subclone. In neither of the subclones was induction of γ-GCS observed during 24-hour exposure to etoposide. Furthermore, the catalytic subunit of γ-GCS was cleaved during apoptosis, concurrent with depletion of intracellular glutathione. When glutathione was depleted by treatment with buthionine sulfoximine, a direct inhibitor of γ-GCS, the sensitivity to etoposide was increased, particularly in the ER subclone. Conclusions: The results underline the significance of glutathione biosynthesis in the responsiveness of AML cells to etoposide. The molecular mechanisms mediating glutathione depletion during etoposide exposure might include the cleavage of the catalytic subunit of γ-GCS.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    International journal of legal medicine 94 (1985), S. 31-39 
    ISSN: 1437-1596
    Schlagwort(e): Alcohol and immersion hypothermia ; Skeletal muscle activity in alcohol-treated rabbits ; Hypothermie, Erhöhung der Skelettmuskelaktivität unter Alkoholeinfluß ; Alkoholeffekte, bei Unterkühlung
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Rechtswissenschaft
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es wurden die Effekte von Alkoholinjektionen (0.5 g·kg−1i.v.) auf die Geschwindigkeit der Unterkühlung und Wiedererwärmung des Körperkerns, die Konzentration der Adeninnukleotide und den Phosphorylierungszustand des Adenylatsystems (ATP/ADP×P) im Skelettmuskel von anästhesierten Kaninchen, die im eiskalten Wasser gehalten wurden, studiert. Kaninchen, die NaCl-Injektionen erhielten und in eiskaltem Wasser gehalten wurden, dienten als Kältekontrollen, alkoholbehandelte Tiere, die bei Raumtemperaturen (20°C) gehalten wurden, dienten als Wärmekontrollen unter Alkohol und Tiere, die NaCl-Injektionen erhielten und bei Raumtemperatur gehalten wurden, dienten als Anästhesiekontrollen. Der Abfall der Kerntemperatur auf 32°C nahm bei den alkoholbehandelten Kaninchen und den Kältekontrollen ca. 40 min in Anspruch. Während dieser Zeit fiel die Temperatur bei den alkoholwarmen und anästhesierten Kontrollen nur um ungefähr 1°C. Es wurden keine Unterschiede der Wiedererwärmungsgeschwindigkeit zwischen den alkoholbenhandelten Kaninchen und den Kältekontrollen beobachtet. Die Serumglukosekonzentration war bei den kalten Kontrolltieren gestiegen (von 5.9 auf 8.3 mmol/l), jedoch nicht bei den alkoholbehandelten Kaninchen. Die Kälteexposition reduzierte den Phosphorylierungszustand im Skelettmuskel der alkoholbehandelten Kaninchen um 32% (p〈0.005), bei den kalten Kontrolltieren jedoch war die Senkung (6%) nicht signifikant. Nach Wiedererwärmung fiel der Phosphorylierungszustand in den oben genannten Gruppen um 71 bzw. 15% verglichen mit den Ausgangswerten. Bei den Wärmekontrollen wurden nur nicht signifikante Veränderungen des Phosphorylierungszustandes gefunden. Die Laktat: Pyruvatratio veränderte sich weder im Skelettmuskel noch in der Leber. Es waren auch keine Veränderungen in den pO2- oder pCO2-Konzentrationen im arteriellen Blut zu beobachten. Daraus wird gefolgert, daß bei alkoholbehandelten Kaninchen eine Erhöhung der Skelettmuskelaktivität während der Immersionshypothermie eintritt, jedoch nicht bei den Kontrolltieren.
    Notizen: Summary The effects of alcohol injection (0.5 g·kg−1i.v.) on the core cooling and rewarming rates, concentration of the adenine nucleotides, and the phosphorylation state of the adenylate system (ATP/ADP×P) were studied in the skeletal muscle of anesthetized rabbits immersed in ice-cold water. NaCl-injected rabbits immersed in ice-cold water were used as cold controls, alcohol-treated animals at room temperature (20°C) as alcohol warm controls, and NaCl-injected animals at room temperature as anesthesia controls, respectively. The fall of core temperature to 32°C in the alcohol-treated rabbits and the cold controls took about 40 min. During this time the temperature of the alcohol warm and anesthesia controls fell by about 1°C. No difference in the rewarming rate was observed between the alcohol-treated and cold control rabbits. Serum glucose concentration was elevated in the cold controls (from 5.9 to 8.3 mmol/l) but not in the alcohol-treated rabbits. Cold exposure reduced the phosphorylation state in the skeletal muscle of the alcohol-treated rabbits by 32% (P〈0.05), but the decrease (6%) was not significant in the cold controls. After rewarming the phosphorylation state decreased in the above groups by 71% and 15%, respectively, as compared with the initial values. No significant changes in the phosphorylation state were found in the warm control animals. The redox state of the cytosol in the skeletal muscle or liver did not change, nor was there any change observed in the arterial pO2 or pCO2 concentrations. In conclusion, the results suggest an increased skeletal muscle activity during immersion hypothermia in alcohol-treated rabbits, but not in the controls.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Springer
    European journal of applied physiology 51 (1983), S. 237-245 
    ISSN: 1439-6327
    Schlagwort(e): Cold-exposure ; Muscle mitochondria ; Cytochromes ; Succinate dehydrogenase ; Cytochrome oxidase ; Respiration rate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effects of cold adaptation of 1, 2, 3, and 4 weeks at 4
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Springer
    European journal of applied physiology 46 (1981), S. 339-345 
    ISSN: 1439-6327
    Schlagwort(e): Cold-exposure ; Mitochondrial enzymes of adipose tissue ; Human adults
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Histochemical reactions and activities of mitochondrial enzymes in adipose tissue around the neck arteries and in pericardium were studied in men who had been outdoor workers in northern Finland. The purpose was to study the occurrence of brown fat in workers having been exposed to cool or cold ambient temperature. Indoor workers of the same age were used as controls. Histochemically, no mitochondrial enzyme reactions were seen in the adipose tissues taken from the indoor workers, whereas some outdoor workers had some multilocular adipose tissue, mostly around the neck arteries. Biochemical parameters also showed increased enzyme activities of aerobic energy metabolism in the adipose tissue of these people. The present results suggest that working in the cold can retain brown adipose tissue in “strategic” places in human adults.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    ISSN: 1573-6822
    Schlagwort(e): amosite ; asbestos ; cytotoxicity ; mesothelial cells ; radicals ; superoxide dismutase ; tumor necrosis factor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract We compared induction of manganese superoxide dismutase (MnSOD) by asbestos fibers and tumor necrosis factor α (TNF) using cultures human mesothelial cells. Transformed pleural mesothelial cells (MET 5A) were exposed for 48 h to amosite asbestos fibers (2 μg/cm2), to TNF (10 Ng/ml), and to the combination of these two. TNF and amosite+TNF caused significant MnSOD mRNA upregulation. Similarly MnSOD specific activity was increased by TNF (290% increase) and the amosite+TNF combination (313% increase) but not by amosite alone. In cell injury experiments, amosite and amosite+TNF exposures caused significant cell membrane injury when assessed by lactate dehydrogenase release, which was 31% and 57% higher than in the unexposed cells. However, only the amosite+TNF combination caused significant depletion of cellular high-energy nucleotide when expressed as percentage of [14C]denine labeling in cellular high-energy nucleotides. The nucleotide levels were 91.5 ± 2.0% in the unexposed cells, 89.9 ± 3.9% in amosite-exposed cells, 90.1 ± 2.2% in TNF-exposed cells, and 79.8 ± 9.4% in amosite+TNF-exposed Amosite+TNF-exposed cells were also most sensitive to menadione (20 μmol/L, 2 h), a compound which generates superoxide radicals intracellularly. In conclusion, our data suggests that in human mesothelial cells inflammatory cytokines but not asbestos fibers alone can cause MnSOD induction. In this study, however amosite asbestos+TNF treatment rendered these cells more vulnerable to oxidant-induced cell damage despite elevated MnSOD activity.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...