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Latest Paper:
J Röther,
U Laufs,
M Böhm,
S Willems,
B Scheller,
M Borggrefe,
H Darius,
M Endres,
U Zeymer,
H-C Diener,
M Grond,
W Hacke,
M Forsting,
M Schumacher,
M Hennerici
Neurologische Klinik, Johannes-Wesling-Klinikum Minden, 32429 Minden. joachim.roether@klinikum-minden.de
Stroke is a serious complication of percutaneous coronary intervention and atrial fibrillation ablation procedures and patients have a high likelihood of persistent neurological deficits. Although formal criteria speak against intravenous or intra-arterial thrombolysis due to pre-existing antithrombotic and anticoagulation therapy, the conditions for recanalizing therapy are optimal due to the occurrence of vessel occlusion in the catheter suite or the chest pain unit. Brain imaging and an interdisciplinary approach are mandatory. In cases of intracerebral vessel occlusion intra-arterial thrombolysis possibly in combination with mechanical clot fragmentation is the first choice therapy. The management of the patient is always an individual therapeutic decision based on stroke severity, the pretreatment with antithrombotic and anticoagulation drugs, the availability of a neuro-interventionalist and the qualification of the local team.
Klinik für Innere Medizin III, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitätsklinikum des Saarlandes, D-66421 Homburg/Saar, Germany.
Reverse cholesterol transport, although not well understood, is an important mechanism in the pathophysiology of atherosclerosis. Macrophages can eliminate some cholesterol from atherosclerotic lesions by an oxidative mechanism involving sterol 27-hydroxylase. Patients with inherited "cerebrotendinous xanthomatosis" lack sterol 27-hydroxylase (CYP27A1) and develop severe premature atherosclerosis despite normal serum cholesterol concentrations. Thus, it has been speculated that sterol 27-hydroxylase is an anti-atherosclerotic enzyme. Here, we report the case of a 25-year-old patient who presented to our emergency room with an acute non-ST elevation myocardial infarction due to severe coronary heart disease. Lipid analysis revealed dramatically increased 27-hydroxycholesterol and low high-density lipoprotein (HDL)-cholesterol levels. Previous reports suggest that 27-hydroxylase is upregulated to protect peripheral cells from severe cholesterol accumulation, especially in cases of ineffective reverse cholesterol transport due to low HDL-cholesterol levels. Our findings indicate that oxysterols could play an important and so far underestimated role in reverse cholesterol transport.
Oliver Weingärtner,
Nadja Weingärtner,
Bruno Scheller,
Dieter Lütjohann,
Stefan Gräber,
Hans-Joachim Schäfers,
Michael Böhm,
Ulrich Laufs
aKlinik für Innere Medizin III, Kardiologie, Angiologie und Internistische Intensivmedizin bInstitut für Medizinische Biometrie, Epidemiologie und Informatik cKlinik für Thorax- und Herz-Gefässchirurgie, Universitätsklinikum des Saarlandes, Homburg/Saar dAbteilung für Klinische Pharmakologie, Universitätsklinikum Bonn, Bonn, Germany.
OBJECTIVE: Hypercholesterolemia is a risk factor for aortic stenosis (AS) and for coronary artery disease (CAD). Serum cholesterol concentrations are determined by intestinal cholesterol absorption and endogenous cholesterol synthesis. Vascular effects of differences in cholesterol metabolism in patients with AS are so far unknown. Therefore, the aim of this study was to investigate differences in cholesterol metabolism in relation to vascular diseases in this subset of patients. METHODS: In addition to identifying conventional coronary risk factors, we determined plant sterols (indicators of cholesterol absorption) and lathosterol (indicator of cholesterol synthesis) levels in 40 consecutive men and women with AS. Coronary angiograms before the aortic valve replacement determined the extent of CAD. RESULTS: Patients with a positive history of cardiovascular disease exhibited an increased campesterol-to-lathosterol ratio in plasma (P< .005) and in aortic valve cusps (P< .05). The plasma campesterol-to-lathosterol ratio increased with CAD severity (zero, single, two, three-vessel disease; P< .05). Coronary vessel score strongly correlated with the campesterol-to-lathosterol ratio in plasma (r = .52; P< .001) and in aortic valve cusps (r = .33; P< .03). Logistic regression analysis revealed that the ratio of campesterol-to-lathosterol was the sole predictor of CAD among coronary risk factors tested (P< .01). CONCLUSION: Enhanced absorption and reduced synthesis of cholesterol is related to a positive family history of cardiovascular diseases and the development of concomitant CAD in patients with AS.
Keywords:
Klinik für Innere Medizin III, Kardiologie, Angiologie und Internistische Intensivmedizin; Universitätsklinikum des Saarlandes, Homburg/Saar, D-66421 Homburg/Saar, Germany.
Recruitment of circulating monocytes into the vasculature and release of reactive oxygen species (ROS) promote atherogenesis. Rac1-GTPase is an essential component of the superoxide-producing NADPH-oxidase complex. Estrogens inhibit production of vascular reactive oxygen species. Angiotensin II as well as overexpression of the constitutively active mutant RacL61 increased ROS production in monocytes. AngII-mediated ROS release was completely inhibited by overexpression of the dominant negative mutant RacN17 or treatment with 17beta-estradiol. 17beta-estradiol reduced Rac1-expression concentration- and time-dependently and decreased basal, as well as AngII-induced Rac1 activity. The effects of 17beta-estradiol were receptor-mediated. In vivo, down-regulation of Rac1 by 17beta-estradiol was observed in human mononuclear cells of women with elevated 17beta-estradiol levels after controlled ovarian hyperstimulation. In summary, the data show that down-regulation of Rac1-GTPase contributes to the inhibition of angiotensin II- mediated superoxide release by 17beta-estradiol in monocytes.
Klinik für Innere Medizin III, Universitätsklinikum des Saarlandes, Homburg, Germany. ulrich@laufs.com
Current guidelines from large randomised trials recommend that all patients with diabetes type 2 or coronary artery disease after myocardial infarction should be treated with statin drugs. However, the recent 4D and CORONA trials show no improvement in mortality in elderly patients with ischaemic heart failure and patients with diabetes and end-stage renal disease receiving haemodialysis with the onset of statin treatment. The survival benefit from statin treatment appears to stem primarily from the prevention of progression of coronary artery disease. In clinical conditions where coronary artery disease does not significantly contribute to the cause of death statins seem to be less effective. In patients at risk for organ damage, statin treatment, therefore, has to be started early in the course of the disease. The effect of statin withdrawal in ischaemic heart failure or in patients with advanced renal disease is not known. On the basis of the available evidence, current statin treatment should not be stopped in these patients.
Klinik für Innere Medizin III, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitätsklinikum des Saarlandes, Homburg/Saar, Germany.
Aims: Inhibition of the angiotensin converting enzyme (ACE) prevents maladaptive cardiac remodelling. Endothelial progenitor cells (EPC) from the bone marrow contribute to endothelial repair and neovascularization, effects that are potentially important during cardiac remodelling. We hypothesized that ACE inhibitors may exert beneficial effects during pressure-induced myocardial hypertrophy by regulating progenitor cell function. Methods & Results: In C57/Bl6 mice, development of cardiac hypertrophy induced by transaortic constriction (TAC) for 5 weeks was reduced by ramipril, 5 mg/kg p.o., independent of blood pressure lowering. Ramipril prevented TAC-induced apoptosis of cardiac myocytes and endothelial cells. On day one after TAC, upregulation of Sca-1(pos)/KDR(pos) EPC was observed which was further increased by ramipril. EPC were persistently elevated in the TAC mice receiving vehicle treatment but not in the ramipril group after 5 weeks. These effects were independent of Hif-1alpha mRNA and protein expression. The ACE inhibitor, but not TAC improved the migratory capacity of DiLDL(pos) EPC. Increased cardiac afterload induced upregulation of extracardiac neoangiogenesis. This effect was enhanced by ACE inhibition. Ramipril, but not TAC, markedly increased cardiac capillary density determined by the ratio of CD31(pos) cells to cardiomyocytes. Bone marrow transplantation studies revealed that TAC increased the percentage of bone marrow-derived GFP(pos) endothelial cells in the myocardium, and ramipril made this effect more pronounced. Conclusions: ACE inhibition prevents pressure-induced maladaptive cardiac hypertrophy and increases intra- and extracardiac neoangiogenesis associated with upregulation of endothelial progenitor cells and amelioration of EPC migration. The regulation of progenitor cells from the bone marrow identifies a novel effect of ACE inhibitors during cardiac remodelling.
Klinik für Innere Medizin III (Kardiologie, Angiologie und Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar.
The stimulation of collateral artery growth (arteriogenesis) is a promising alternative approach to non-invasively treat arterial obstructive disease, such as coronary, peripheral or cerebral artery disease. Patients unable to undergo conventional revascularization strategies may benefit from adaptive arteriogenesis. Underlying mechanisms are experimentally validated and include an increase in shear stress after obstruction or occlusion of a major artery; monocyte adhesion, transmigration and perivascular accumulation, secretion of growth factors; and smooth muscle and endothelial cell proliferation and growth of pre-existent collateral arteries. Therapeutic stimulation of arteriogenesis with cytokines has been successfully performed in experimental models. Translation into clinical practice, however, has hitherto been problematic. Reasons for this include differences between the healthy laboratory animal and an often severely diseased patient, possible harmful effects of pro-arteriogenic therapies and unsuitable clinical endpoints for the detection of collateral artery growth. Recent investigations of human arteriogenesis demonstrate significant inter-individual differences and point towards the importance of anti-arteriogenic mechanisms in patients with impaired adaptive arteriogenesis and high cardiovascular risk factors.
Mesh-terms: Angiogenesis Inducing Agents :: therapeutic use; Animals; Arterial Occlusive Diseases :: therapy; Collateral Circulation :: drug effects; Collateral Circulation :: physiology; Cytokines :: physiology; Disease Models, Animal; Humans; Intercellular Signaling Peptides and Proteins :: therapeutic use; Mice; Monocytes :: cytology; Monocytes :: drug effects; Monocytes :: physiology; Neovascularization, Physiologic :: drug effects; Rabbits; Signal Transduction :: drug effects; Signal Transduction :: physiology; Swine;
Klinik für Innere Medizin III, Abteilung für Kardiologie, Angiologie und internistische Intensivmedizin, Universitätsklinikum des Saarlandes, Kirrberger Strasse, Gebäude 40, 66421 Homburg/Saar, Germany.
Keywords:
Klinik für Innere Medizin III, Universitätsklinikum des Saarlandes, Homburg/Saar, Germany. Janine.poess@gmx.de
On the basis of large randomized trials, current guidelines recommend to treat all patients with type 2 diabetes or coronary artery disease after myocardial infarction with statin drugs. However, the recent 4D, CORONA and GISSI-HF trials show that old patients with ischemic heart failure and patients with diabetes and end-stage renal disease on hemodialysis do not benefit from new onset of statin therapy with regard to mortality. The survival benefit from statin therapy appears to stem primarily from the prevention of progression of coronary artery disease. In clinical conditions where coronary artery disease does not significantly contribute to the cause of death, statins seem to be less effective. In patients at risk of organ damage, statin therapy therefore has to be initiated early in the course of the disease. The effect of statin withdrawal in ischemic heart failure or in patients with advanced renal disease is not known and potentially harmful and therefore, on the basis of the available evidence, ongoing statin treatment should not be stopped in these patients.
