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
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Aims : To investigate the monoclonal antibody M30 for the assessment of apoptosis in colorectal tissues. Although Terminal deoxyribonucleotidyl transferase mediated nick end labelling (TUNEL) and in-situ end labelling (ISEL) are the methods most often used to demonstrate and quantify apoptosis in histological tissue sections, the interpretation and specificity of these techniques have been controversial. Immunohistochemistry using the monoclonal antibody M30 that recognizes caspase-cleaved cytokeratin 18 is considered to be a promising alternative but has yet to be validated against a generally accepted standard.Methods and results : Paraffin sections of normal colonic mucosa (n = 30), normal mucosa obtained from resection margins from carcinomas (n = 30), colorectal adenomas (n = 84) and carcinomas (n = 40) were studied. Apoptosis of epithelial cells was assessed by M30 immunoreactivity and morphological criteria and expressed as a proportion of the total number of cells counted (apoptotic index). Mean apoptotic indices using M30 were 0.18 ± 0.04% in normal mucosa, 0.42 ± 0.04% in adenomas and 1.97 ± 0.24% in carcinomas. Using morphological criteria, these indices were 0.23 ± 0.03%, 0.62 ± 0.06% and 1.78 ± 0.19%, respectively. Apoptotic counts were higher in normal mucosa obtained from resection margins than in genuinely normal mucosa using the M30 antibody. Apoptotic indices obtained by M30 immunoreactivity and morphological criteria were positively correlated (r = 0.71, P 〈 0.01).Conclusion : Assessment of apoptotic cells by M30 immunoreactivity correlates well with morphological criteria. Apoptotic indices increase in the course of the adenoma–carcinoma sequence. Apoptosis in normal mucosa obtained from resection margins differs from genuinely normal mucosa necessitating caution when interpreting studies of apoptosis in normal colonic mucosa. Our findings support the use of the M30 method in the study of apoptosis in colorectal tissues.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Non-steroidal anti-inflammatory drugs are chemopreventive agents in colorectal cancer. Non-steroidal anti-inflammatory drugs do not, however, offer complete protection against adenoma and carcinoma development. There is increasing interest in combining non-steroidal anti-inflammatory drugs with agents that target specific cell signalling pathways in malignant and premalignant cells.This review aims to describe the current knowledge regarding the efficacy of peroxisome proliferator-activated receptor-γ ligands, cholesterol synthesis inhibitors (statins), epidermal growth factor signalling inhibitors and tumour necrosis factor-related apoptosis-inducing ligand against colorectal neoplasms and the rationale for combining these drugs with non-steroidal anti-inflammatory drugs to improve efficacy in the chemoprevention of colorectal cancer, a PUBMED computer search of the English language literature was conducted to identify relevant papers published before July 2004.Peroxisome proliferator-activated receptor-γ ligands and statins, both in clinical use, reduce the growth rate of human colon cancer cells in vitro and in rodents models. In vitro, preclinical in vivo and clinical studies have shown efficacy of epidermal growth factor signalling inhibition in colorectal cancer. In vitro, tumour necrosis factor-related apoptosis-inducing ligand induces apoptosis in human colon cancer cells, but not in normal cells. These drugs have all been shown to interact with non-steroidal anti-inflammatory drugs in colorectal cancer cells and/or in rodent models.Combinational regimen are a promising strategy for the chemoprevention of colorectal cancer and should be further explored.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 18 (2003), S. 0 
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background : Seemingly conflicting results have been reported on the prevalence and severity of inflammatory bowel disease after liver transplantation. Regimens with different combinations of drugs can be used for immunosuppression after transplantation.Aim : To study retrospectively the prevalence of inflammatory bowel disease after liver transplantation, and the possible relationship with maintenance immunosuppressive regimens.Methods : All 78 patients with end-stage primary sclerosing cholangitis (48 patients) or autoimmune cirrhosis (30 patients), transplanted between 1979 and July 2001, and with a follow-up of at least 1 year, were eligible for this study. In addition to patient and transplant characteristics, data on inflammatory bowel disease and immunosuppression before and after transplantation were collected. The Kaplan–Meier method was used for survival analysis. Possible risk factors for inflammatory bowel disease after transplantation were analysed by Cox univariate and multivariate regression.Results : The median follow-up after transplantation was 7.2 years (range, 1.1–22.3 years). Nine of 25 patients with pre-transplant inflammatory bowel disease experienced flare-ups after transplantation. Six of 53 patients without pre-transplant inflammatory bowel disease developed de novo inflammatory bowel disease after transplantation. The cumulative risks (standard errors in parentheses) for inflammatory bowel disease were 6% (3%), 12% (4%) and 20% (5%) at 1, 3 and 5 years after transplantation, respectively. The inflammatory bowel disease-free survival was significantly higher in patients not receiving tacrolimus vs. those receiving tacrolimus, in patients receiving azathioprine vs. those not receiving azathioprine and in patients taking the regimen prednisolone–azathioprine–ciclosporin A vs. those taking tacrolimus–prednisolone. Pre-transplant inflammatory bowel disease and the use of tacrolimus were found to be independent predictors for inflammatory bowel disease after transplantation.Conclusions : The prevalence of inflammatory bowel disease after liver transplantation is affected by the immunosuppression used. Azathioprine seems to have a protective effect and tacrolimus a promoting effect.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    ISSN: 0165-4608
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    ISSN: 1432-2277
    Schlagwort(e): CMV, renal transplantation, intestinal permeability kwRenal transplantation, CMV, intestinal permeability ; Permeability, intestinal, CMV ; Intestinal permeability, renal transplantation, CMV
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Cytomegalovirus (CMV) infections in renal transplant recipients can affect the gastrointestinal tract, but significant clinical manifestations are seldom seen. We hypothesize that subclinical involvement of the gastrointestinal tract may be quite frequent during CMV infection. In order to study this, we measured intestinal permeability by calculating the urinary lactulose mannitol (LM) excretion ratio after oral administration of lactulose and mannitol (normal〈0.030) in patients with symptomatic and asymptomatic CMV infection. A total of 111 patients were enrolled in the study, 104 of whom were tested on postoperative day (POD) 10. Twenty-nine patients developed CMV infection, 12 of whom could be studied with the permeability test (median POD 40). Another nine patients without CMV infection were also studied at day 40 and served as controls. The LM ratio increased significantly during CMV infection compared to measurements before active infection (median 0.060 vs. 0.030, P〈0.01) and was significantly higher during the infection than in the control group (median 0.007, P〈0.01). No correlation could be found between the LM ratio and viral load, humoral response to the virus, or symptomatology of infection. We conclude that an increased intestinal permeability is found in a substantial number of patients with an active, albeit asymptomatic, CMV infection after renal transplantation. Pathophysiological mechanisms and clinical implications remain speculative but will be subject to further study.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 33 (1987), S. 319-321 
    ISSN: 1432-1041
    Schlagwort(e): pirenzepine ; gastrin release ; gastric acid secretion ; atropine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary We have studied the effects of the selective muscarinic M1-receptor antagonist pirenzepine and the non-selective muscarinic antagonist atropine on bombesin- and peptone-stimulated gastrin release in healthy subjects. Pirenzepine (i. v. bolus 0.6 mg/kg) and atropine (i. v. bolus 15 µg/kg, followed by an infusion of 5 µg·kg−1·h−1) were given in doses equipotent in terms of reduction of gastric acid secretion. Neither affected bombesin- or peptone-stimulated gastrin release. These findings do not support the involvement of M1-receptors in the cholinergic regulation of gastrin release and suggest that the reduction in acid secretion caused by pirenzepine is not mediated by inhibition of gastrin release.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Digestive diseases and sciences 31 (1986), S. 1095-1099 
    ISSN: 1573-2568
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract This study was undertaken to determine whether histamine H2-receptors are involved in the regulation of gastrin secretion in man. Since previous studies on the effect of histamine H2-receptor blockade on gastrin release are conflicting, we have studied the effect of histamine infusion (130 nmol/kg/hr) with simultaneous H1-receptor blockade on gastrin release in healthy male subjects. Intragastric pH was maintained at 4.5 by continuous intragastric titration during all studies. Histamine did not affect gastrin release stimulated by infusion of bombesin (90 pmol/kg/hr) or by a peptone meal. Integrated gastrin secretion during bombesin plus histamine was 767±151 pmol·min/liter (±SEM), compared to 757±144 pmol·min/liter during bombesin plus saline (not significant), whereas integrated meal-stimulated gastrin release was 1666±456 pmol·min/liter during histamine and 1856±492 pmol·min/liter during saline. It is concluded that histamine H2-receptors do not seem to be involved in the regulation of gastrin secretion in man.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Digestive diseases and sciences 29 (1984), S. 321-326 
    ISSN: 1573-2568
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A comparison was made between use of isotonic 0.15 M sodium chloride and 5.8 g/100 ml glucose solutions for measurement of gastric acid secretion by intragastric titration in normal and ulcer subjects. Glucose distention did not cause significantly different acid secretion than saline distention in either group. The total amounts of glucose entering the duodenum over the 3.5-hr study period were 99 g in normal subjects and 122 g in ulcer subjects. In normal subjects, circulating gastrin-related acid secretion curves were not significantly different during endogenous peptone and exogenous G-17 stimulation using either the glucose or the saline meals. This finding provides evidence that glucose meals of this size do not alter sensitivity to gastrin. With glucose meals, inhibition of gastric emptying caused retention of a sufficient volume in the stomach to permit accurate continuous intragastric titration. Saline meals caused pronounced diarrhea which was not seen after glucose meals. Glucose distention intragastric titration allows reliable comparisons of endogenously and exogenously stimulated gastric acid secretion without serious side effects and is especially suitable for studying acid secretion in duodenal ulcer subjects.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    ISSN: 1573-2568
    Schlagwort(e): BARRETT'S ESOPHAGUS ; DYSPLASIA ; PROLIFERATION ; 5-BROMODEOXYURIDINE LABELING
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Barrett's esophagus (BE) is a premalignantcondition, due to chronic gastroesophageal reflux.Effective antireflux therapy may diminish cancer risk.To evaluate this option an intermediate marker isneeded. We developed a methodology for measurement ofepithelial cell proliferative activity of Barrett'smucosa as an intermediate marker and correlated theactivity with traditional cancer risk markers and other parameters. Fifty-six patients (21-74 years ofage) with Barrett's esophagus and established acidgastroesophageal reflux were included. Biopsies weretaken from Barrett's mucosa at 3-cm intervals. Reflux was measured by 24-hr pH-metry. Proliferativeactivity was determined using in vitro labeling with5-bromodeoxyuridine and immunohistochemistry and wasexpressed as labeling index (LI). The length of BE correlated with erect acid reflux (P = 0.002).LI in specialized columnar metaplasia was higher than ingastric metaplasia, especially in crypt epithelium (P〈 0.05). Multiple regression analysis revealed independent positive correlations for surfaceLI with dysplasia (P = 0.011), distance from theincisors (P = 0.041), and crypt LI (P = 0.000). Crypt LIshowed an independent positive correlation with the length of BE (P = 0.033) and type ofmetaplasia (P = 0.007). In conclusion, epithelial cellproliferative activity of BE correlates with severalknown risk factors for cancer. Proliferative activity is an attractive intermediate marker toevaluate the effects of interventional measures todecrease cancer risk in Barrett's esophagus.
    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...