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Institut
- Medizinische Klinik und Poliklinik I (342) (entfernen)
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- Johns Hopkins University School of Medicine (1)
- Klinische Studienzentrale (Universitätsklinikum) (1)
Unique functions of DNA topoisomerase IIalpha and IIbeta have been suggested. A human cell line which carries a homozygeous mutation of the nuclear localization sequence of the topoisomerase IIalpha gene expresses the isoform outside the nucleus at the onset of mitosis. At mitosis topoisomerase IIbeta diffused away from the chromatin despite the nuclear lack of the IIalpha-form. Chromosome condensation and disjunction was performed with the aid of cytosolic topoisomerase IIalpha which bound to the mitotic chromatin with low affinity. Consequently an increased rate of nondisjunction is observed in these cells. It is concluded that high affinity chromatin binding of topoisomerase IIalpha is essential for chromosome condensation/disjunction and that topoisomerase IIbeta does not adopt these functions. A centrosomal protein was recognized by topoisomerase IIalpha. This topoisomerase IIalpha-like protein resembles a modified form of topoisomerase IIalpha with an apparent size of 205 kDa compared to 170 kDa. The expression of the protein is constant in all stages of the cell cycle and it appears in proliferating as well as in resting cells. If there is not sufficient topoisomerase IIalpha present at mitosis the centrosomal proteins might adopt the function and a mitotic catastrophe in the cells could therefore be prevented.
The first goal of this study was to develop cell lines with a stable expression of bio-fluorescent topo II and topo I. This was successfully achieved using a bicistronic vector system. Control experiments showed that proteins of expected size were expressed, and that GFP-tagged topos I, IIa, and IIb were active in the cells and fully integrated in the endogenous pools of the enzymes. These cell-lines provided a novel tool for investigating the cell biology of human DNA topoisomerases. Our most important finding was, that both types of mammalian topoisomerases are entirely mobile proteins that are in continuous and rapid flux between all compartments of the nucleus and between the cytososl and the chromosomes of mitotic cells. This was particularly surprising with regard to topo II, which is considered to be a structural component of the nuclear matrix and the chromosome scaffold. We must conclude that if this was the case, then these architectural structures appear to be much more dynamic than believed until now. In this context it should also be mentioned, that the alignment of topo II with the central axes of the chromosome arms, which has until now been considered a hall-mark of the enzyme’s association with the chromosomal scaffold, is not seen in vivo and can be demonstrated to be to some extent an artefact of immunohistochemistry. Furthermore, we show that the two isoforms of topo II (a and b) have a different localisation during mitotic cell division, supporting the general concept that topo II functions at mitosis are exclusively assigned to the a-form, whereas at interphase the two isoenzymes work in concert. Despite unrestricted mobility within the entire nuclear space, topoisomerases I and II impose as mostly nucleolar proteins. We show that this is due to the fact that in the nucleoli they are moving slower than in the nucleoplasm. The decreased nucleolar mobility cannot be due to DNA-interactions, because compounds that fix topoisomerases to the DNA deplete them from the nucleoli. Interestingly, the subnucleolar distribution of topoisomerases I and II was complementary. The type II enzyme filled the entire nucleolar space, but excluded the fibrial centers, whereas topo I accumulated at the fibrial centers, an allocation directed by the enzyme’s N-terminus. During mitosis, it also mediates association with the nucleolar organising regions of the acrocentric chromosomes. Thus, topo I stays associated with the rDNA during the entire cell-cycle and consistently colocalizes there with RNA-polymerase I. Finally, we show that certain cancer drugs believed to act by stabilising covalent catalytic DNA-intermediates of topoisomerases, do indeed immobilize the enzymes in living cells. Interestingly, these drugs do not target topoisomerases in the nucleoli but only in the nucleoplasm.
Two isoforms of human CD23 (CD23a and CD23b) have been described. They differ by only 6-7 residues in the N-terminal cytoplasmic tail. CD23a is restrictively expressed on B-cells while CD23b is inducible on B-cells, as well as monocytes, eosinophils, macrophages and a variety of other cell types, after IL-4 stimulation. The two isoforms seems to have different functions. CD23a appears to be the isoform associated with endocytosis of IgE immune complexes and mediating antigen presentation on B-cells. CD23b has a phagocytosis motif and seems to be involved in the phagocytosis of IgE-coated particles, cytokine release and the generation of superoxides. Previous studies indicate that the two isoforms connect to different signal transduction pathways. Comparing the cells that express only one or both CD23 isoforms suggests that CD23b is involved in upregulating cAMP and iNOS, whereas CD23a mediates an increase in intracellular calcium. In the main part of the study we investigated how the CD23a B-cell specific expression is regulated. Pax-5 is a B-cell restricted transcription factor with an essential role in early and late B-cell development. Putative Pax-5 binding sites have been predicted in the CD23a proximal promoter. Analyses of the CD23a promoter revealed three putative Pax-5 binding sites with more than 50% homology to the consensus sequence. One of these sites, named CD23-1 can compete a high affinity Pax-5 binding site or can directly bind Pax-5 protein in electrophoretic mobility shift assays. Introducing mutations into this site abrogates the binding. A different approach, in which overlapping peptides covering the length of the CD23a promoter were tested in competition assays against a high affinity binding site, also revealed CD23-1 as the only site that directly binds Pax-5 protein. Expression of Pax-5 in 293 cells resulted in a 7-fold activation of a CD23a core promoter construct. Co-transfection together with STAT6 showed that Pax-5 cooperates with this transcription factor in enhancing the level of transcription of a CD23a extended promoter construct. Most importantly, ectopic expression of Pax-5 in the monocytic cell line U-937 that regularly expresses only the CD23b isoform enabled a significant CD23a expression after stimulation with IL-4 and PMA. Our results suggest that Pax-5 is a key regulator of the B-cell restricted expression of the CD23a isoform. In the second part of the project, we used a yeast two-hybrid system (CytoTrapTM from Stratagene) in order to look for cytoplasmic interaction partners for the CD23 receptor. The system was established in order to reach a high efficiency of transformation and different bait vector constructs were made. The screening was performed using a human spleen library cloned in the target vector of the system. The first bait constructs used (pSosCD23a and pSosCD23b) expressed the very short (22 amino acids) cytoplasmic tails of the isoforms at the C-terminal end of the fusion protein (human SOS). Improved bait constructs, (pSosCD23a+Linker and pSos CD23b+Linker) expressed the cytoplasmic tail of CD23a/b at the N-terminal side of the human SOS and had in consequence the N-terminal part free as a bait, as it occurs in vivo. A flexible linker region separated the fusion proteins in order to make the small amino acid bait chain more obvious. Approximately three million library clones were screened with these various constructs. No “true positive” interaction was detected. A relatively high number of “false positive” clones were obtained and checked in another two-hybrid system. A new bait construct, in which the tyrosine residue in the cytoplasmic tail of CD23a was replaced by a glutamic acid residue will be used for future screening. The system was also used in order to test the interaction between CD23 and p59fyn, a member of the Src family of protein kinases that was mentioned to associate with CD23a. No interaction was detected by using the CytoTrap two-hybrid system. In conclusion, the key result of the study demonstrates that Pax-5 is a main regulator of the B-cell specific expression of the CD23a isoform. In addition, a two-hybrid system was established and employed in order to look for cytoplasmic interaction partners for CD23.
Inhibition of Nuclear Import of Calcineurin Prevents the Development of Myocardial Hypertrophy
(2007)
The Calcineurin/NFAT signaling cascade is a crucial transducer of cellular function. It has recently been emerged that in addition to the transcription factor NFAT, the phosphatase Calcineurin is also translocated to the nucleus. Our traditional understanding of Calcineurin activation via sustained high Ca2+-levels was also advanced by recent findings from this working group (AG Ritter), which showed that Calcineurin is activated by proteolysis of the C-terminal autoinhibitory domain. This leads to the constitutive activation and nuclear translocation of Calcineurin. Therefore, Calcineurin is not only responsible for dephosphorylating of NFAT in the cytosol thus enabling its nuclear import, its presence in the nucleus is also significant in ensuring the full transcriptional activity of NFAT. Formation of complexes between transcription factors and DNA regulates the transcriptional process. Therefore, the time that transcription factors remain nuclear is a major determinant of transcriptional activity. The movement of proteins over ~40 kDa into and out of the nucleus is governed by the nuclear pore complex (NPC). Transcription factors and enzymes that regulate the activity of these proteins are shuttled across the nuclear envelope by proteins that recognize nuclear localization signals (NLS) and nuclear export signals (NES) within the amino acid sequence of these transcription factors. In this study, the precise mechanisms of Calcineurin nuclear import and export were identified. Additionally to the nuclear localization sequence (NLS) and the nuclear export sequence (NES) within the sequence of Calcineurin, the respective nuclear cargo proteins, responsible for nuclear import, Importinβ1, and for nuclear export, CRM1, were identified. Inhibition of the Calcineurin/importin interaction by a competitive peptide, called Import Blocking Peptide (IBP), which mimicked the Calcineurin NLS, prevented nuclear entry of Calcineurin. A non-inhibitory control peptide showed no effect. Using this approach, it was able to prevent the development of myocardial hypertrophy. In Angiotensin II stimulated cardiomyocytes, both the transcriptional and the translational level was suppressed. Additionally, cell size and expression of Brain natriuretic peptide (as molecular marker for hypertrophy) were significantly reduced compared untreated controls. IBP worked dose-dependent, but did not affect the Calcineurin phosphatase activity. In conclusion, Calcineurin is not only capable of dephosphorylating NFAT, thus enabling its nuclear import, its presence in the nucleus is also important for full NFAT transcriptional activity. Using IBP to prevent the nuclear import of Calcineurin is a completely new approach to prevent the development of myocardial hypertrophy.
Insight into oxidative stress mediated by nitric oxide synthase (NOS) isoforms in atherosclerosis
(2008)
The principle product of each NOS is nitric oxide. However, under conditions of substrate and cofactor deficiency the enzymes directly catalyze superoxide formation. Considering this alternative chemistry of each NOS, the effects of each single enzyme on key events of atherosclerosis are difficult to predict. Here, we evaluate nitric oxide and superoxide production by all three NOS isoforms in atherosclerosis. ESR measurements of circulating and vascular wall nitric oxide production showed significantly reduced nitric oxide levels in apoE/eNOS double knockout (dko) and apoE/iNOS dko animals but not in apoE/nNOS dko animals suggesting that eNOS and iNOS majorly contribute to vascular nitric oxide production in atherosclerosis. Pharmacological inhibition and genetic deletion of eNOS and iNOS reduced vascular superoxide production suggesting that eNOS and iNOS are uncoupled in atherosclerotic vessels. Though genetic deletion of nNOS did not alter superoxide production, acute inhibition of nNOS showed that nNOS contributes significantly to superoxide production. In conclusion, uncoupling of eNOS occurs in apoE ko atherosclerosis but eNOS mediated superoxide production does not outweigh the protective effects of eNOS mediated nitric oxide production. We show that although nNOS is not a major contributor of the vascular nitric oxide formation, it prevents atherosclerosis development. Acute inhibition of nNOS showed a significant reduction of superoxide formation suggesting that nNOS is uncoupled. The exact mechanism of action of nNOS in atheroprotection is yet to be elucidated. Genetic deletion of iNOS reduced NADPH oxidase activity. Thus, iNOS has both direct and indirect proatherosclerotic effects, as it directly generates both nitric oxide and superoxide simultaneously resulting in peroxynitrite formation and indirectly modulates NADPH oxidase activity. We hypothesize that eNOS is coupled in the disease free regions of the vessel and contributes to nitric oxide generation whereas in the diseased region of the vessel it is uncoupled to produce superoxide (Figure 16). nNOS expressed in the smooth muscle cells of the plaque contributes to the local superoxide generation. iNOS expressed in smooth muscle cells and leukocytes of the plaque generates superoxide and nitric oxide simultaneously to produce the strong oxidant peroxynitrite.
The incidence of cardiovascular diseases including cardiac hypertrophy and failure in pre-menopausal women is lower compared to age-matched men but the risk of heart disease increases substantially after the onset of menopause. It has been postulated that female sex hormones play an important role in cardiovascular health in pre-menopausal women. In animal studies including spontaneously hypertensive (SHR) rats, the development of cardiac hypertrophy is attenuated by 17β-estradiol treatment. Cardiac energy metabolism is crucial for normal function of the heart. In cardiac hypertrophy and heart failure, the myocardium undergoes a metabolic shift from fatty acid as primary cardiac energy source to glucose, which re-introduces the fetal type of metabolism that representing the glucose as a major source of energy. Many studies have reported that the disruption of the balance between glucose and fatty acid metabolism plays an important role in cardiac pathologies including hypertrophy, heart failure, diabetes, dilative cardiomyopathy and myocardial infarction. Glucose enters cardiomyocytes via GLUT1 and GLUT4 glucose transporters and GLUT4 is the major glucose transporter which is insulin-dependent. Cardiac-selective GLUT4 deficiency leads to cardiac hypertrophy. This shows that the decrease in cardiac glucose uptake may play a direct role in the pathogenesis of cardiac hypertrophy. Estrogens modulate glucose homeostasis in the liver and the skeletal muscle. But it is not known whether estrogens affect also cardiac glucose uptake which could provide another mechanism to explain the prevention of cardiac hypertrophy by female sex hormones. In the present study, SHR Rats were ovariectomized (OVX), not ovariectomized (sham) or ovariectomized and treated with subcutaneous 17β-estradiol. After 6 weeks of treatment, body weight, the serum levels of estrogen, insulin, intra-peritoneal glucose tolerance test (IP-GTT), myocardial glucose uptake by FDG-PET (2-(18F)-fluoro-deoxyglucose (18FDG) and Positron Emission Tomography), cardiac glucose transporter expression and localization and cardiac hexokinase activity were analyzed. As results of this study, PET analysis of female SHR revealed decreased cardiac glucose uptake in OVX animals compared to intact that was normalized by estrogen supplementation. Interestingly, there was no change in global glucose tolerance among the treatment groups. Serum insulin levels and cardiac hexokinase activity were elevated by E2 substitution. The protein content of cardiac glucose transporters GLUT-4 and GLUT-1, and their translocation as determined by fractionation studies and immuno-staining did not show any significant change by ovariectomy and estrogen replacement. Also levels of insulin receptor substrate-1 (IRS-1) and its tyrosine phosphorylation, which is required for activation and translocation of GLUT4, was un-affected in all groups of SHR. Cardiac gene expression analysis in SHR heart showed that ei4Ebp1 and Frap1 genes which are involved in the mTOR signaling pathway, were differentially expressed upon estrogen treatment. These genes are known to be activated in presence of glucose in the heart. As a conclusion of this study, reduced myocardial FDG uptake in ovariectomized spontaneously hypertensive rat is normalized by 17β-estradiol treatment. Increased myocardial hexokinase appears as a potential mechanism to explain increased myocardial glucose uptake by 17β-estradiol. Increased cardiac glucose uptake in response to 17β-estradiol in ovariectomized SHR may provide a novel mechanism to explain the reduction of cardiac hypertrophy in E2 treated SHR. Therefore, 17β-estradiol improves cardiac glucose utilization in ovariectomized SHR which may give rise to possible mechanism for its protective effects against cardiac hypertrophy.
Cardiovascular disease is the most common mortality risk in the industrialized world. Myocardial infarction (MI) results in the irreversible loss of cardiac muscle, triggering pathophysiological remodelling of the ventricle and development of heart failure. Insufficient myocardial capillary density within the surviving myocardium after MI has been identified as a critical event in this process, although the underlying molecular signalling pathways of cardiac angiogenesis are mechanistically not well understood. The discovery of microRNAs (miRNAs, miRs), small non-coding RNAs with 19-25 nucleotides in length, has introduced a new level of the regulation of cardiac signalling pathways. MiRNAs regulate gene expression post-transcriptionally by binding to their complementary target messenger RNAs (mRNAs) and represent promising therapeutic targets for gene therapy. Here, it is shown that cardiac miR-24 is primarily expressed in cardiac endothelial cells and upregulated following MI in mice and hypoxic conditions in vitro. Enhanced miR-24 expression induces endothelial cell apoptosis and impairs endothelial capillary network formation. These effects on endothelial cell biology are at least in part mediated through targeting of transcription factor GATA2, histone deacetylase H2A.X, p21-activated kinase PAK4 and Ras p21 protein activator RASA1. Mechanistically, target repression abolishes respective and secondary downstream signalling cascades. Here it is shown that endothelial GATA2 is an important mediator of cell cycle, apoptosis and angiogenesis at least in part by regulation of cytoprotective heme oxygenase 1 (HMOX1). Moreover, additional control of endothelial apoptosis is achieved by the direct miR-24 target PAK4. Its kinase function is essential for anti-apoptotic Bad phosphorylation in endothelial cells. In a mouse model of MI, blocking of endothelial miR-24 by systemic administration of a specific antagonist (antagomir) enhances capillary density in the infarcted heart and preserves cardiac function. The current findings indicate miR-24 to act as a critical regulator of endothelial cell apoptosis and angiogenesis. Modulation of miR-24 may be potentially a suitable strategy for therapeutic intervention in the setting of ischemic heart diseases.
Thermodynamics of Competitive Molecular Channel Transport: Application to Artificial Nuclear Pores
(2010)
In an analytical model channel transport is analyzed as a function of key parameters, determining efficiency and selectivity of particle transport in a competitive molecular environment. These key parameters are the concentration of particles, solvent-channel exchange dynamics, as well as particle-in-channel- and interparticle interaction. These parameters are explicitly related to translocation dynamics and channel occupation probability. Slowing down the exchange dynamics at the channel ends, or elevating the particle concentration reduces the in-channel binding strength necessary to maintain maximum transport. Optimized in-channel interaction may even shift from binding to repulsion. A simple equation gives the interrelation of access dynamics and concentration at this transition point. The model is readily transferred to competitive transport of different species, each of them having their individual in-channel affinity. Combinations of channel affinities are determined which differentially favor selectivity of certain species on the cost of others. Selectivity for a species increases if its in-channel binding enhances the species’ translocation probablity when compared to that of the other species. Selectivity increases particularly for a wide binding site, long channels, and fast access dynamics. Recent experiments on competitive transport of in-channel binding and inert molecules through artificial nuclear pores serve as a paradigm for our model. It explains qualitatively and quantitatively how binding molecules are favored for transport at the cost of the transport of inert molecules.
Summary: I previously demonstrated that conditional overexpression of the neuronal nitric oxide synthase (nNOS) inhibited L-type Ca2+-channels and decreased myocardial contractility1 (Burkard N. et al. (2007). Circ Res 100, 32-44). However, nNOS has multiple targets within the cardiac myocyte and it is possible that interesting biological functions of this protein remain to be elucidated. In this study, I showed that nNOS overexpression has a cardioprotective effect after ischemia-reperfusion injury by inhibiting mitochondrial function and reducing the generation of reactive oxygen species (ROS). The effect of conditional nNOS overexpression in cardiac myocytes in ischemiareperfusion injury was assessed. Ischemia-reperfusion injury in WT mice resulted in nNOS accumulation in the mitochondria. Similary, transgenic nNOS overexpression caused nNOS abundance in mitochondria. Electron microscopy of mouse myocardium from nNOS overexpressing mice showed that after induction of its expression, nNOS is additionally localised in mitochondria. nNOS translocation into mitochondria was dependent on HSP90. Ischemia-reperfusion experiments in isolated hearts showed a cardioprotective effect of nNOS overexpression (30min post-ischemia, LVDP 27.0±2.5mmHg in non-induced animals vs. 45.2±1.9mmHg in nNOS overexpressing mice, n=12, p<0.05). Consistently with this finding, in vivo the infarct size within the area at risk was significantly decreased in nNOS overexpressing mice compared to non-induced animals (36.6±8.4 relative % vs. 61.1±2.9 relative %, n=12, p<0.05). nNOS overexpression also caused a significant increase in mitochondrial nitrite levels accompanied by a decrease of cytochrome c oxidase activity (72.0±8.9units/ml in nNOS overexpressing mice vs. 113.2±17.1units/ml in non-induced mice, n=12, p<0.01) resulting in an inhibition of mitochondrial function. Accordingly, O2-consumption (MVO2) in isolated heart muscle stripes was decreased in nNOS overexpressing mice, already under resting conditions (0.016±0.0015 vs. 0.024±0.006ml[O2] x mm-3 x min-1, n=13, p<0.05). Additionally, this study showed that the ROS concentration was significantlydecreased in hearts of nNOS overexpressing mice compared to non-induced animals (6.14±0.685 vs. 14.53±1.7μM, n=8, p<0.01). Application of different inhibitors, Western Blot analysis and activity assays showed that the lower ROS concentration in nNOS overexpressing mice was caused by inhibition of the xanthine oxidoreductase (XOR) activity by the increased abundance of nNOS expression. In summary, this study demonstrated that the conditional transgenic overexpression of nNOS resulted in myocardial protection after ischemia-reperfusion injury. Besides reduction of myocardial Ca2+-overload after reperfusion this might be caused by inhibition of mitochondrial function through nNOS, which reduced myocardial oxygen consumption already under baseline conditions (Burkard N. conditionally accepted by
Background: Adrenocortical carcinoma (ACC) is a rare tumor with a poor prognosis. Often, the physicians who first treat patients with ACC have no prior experience with the disease. The aim of our study was to evaluate the quality of medical care for patients with ACC in Germany.
Methods: Data from the German ACC registry were analyzed with regard to the patients’ preoperative diagnostic evaluation, histopathological reporting, and clinical followup. The findings were compared with the recommendations of the European Network for the Study of Adrenal Tumors (ENSAT).
Results: Data were analyzed from 387 patients who had been given an initial diagnosis of ACC in the years 1998 to 2009. 21% of them underwent no hormonal evaluation before surgery, and 59% underwent an inadequate hormonal evaluation. This exposed the patients to unnecessary perioperative risks and impaired their follow-up. 48% did not undergo CT scanning of the chest, even though the lungs are the most frequent site of metastases of ACC. For 13% of the patients, the diagnosis of ACC was later revised by a reference pathologist. For 11% of the patients, the histopathology report contained no information about resection status, even though this is an important determinant of further treatment and prognosis. Optimal management requires re-staging at three-month intervals, yet some patients underwent re-staging only after a longer delay, or not at all.
Conclusion: We have identified significant deficits in the care of patients with ACC in Germany. We suspect that the situation is similar for other rare diseases. The prerequisite to better care is close and early cooperation of the treating physicians with specialized centers.