Water imbibition in the rat prostate during castration-induced regression

The present study was conducted to examine changes in water concentration in the ventral prostate of adult rats at different intervals following castration. The prostatic dry weight was obtained by drying the fresh prostate at 70 degrees C for at least 110 hr and the prostatic water content was calculated from its wet and dry weight. Under normal conditions, the prostatic water concentration ranges from 81.9 to 82.7% in uncastrated rats. The prostatic water concentration started to increase at 8 hr postcastration (83.1%) but this increase was not statistically significant. By 16 hr postcastration, the prostatic water concentration (83.8%) became significantly higher than that of the uncastrated animals. In rats of day 1 to day 10 postcastration, the prostate contained significantly more water (84.4%-84.7%) than those in uncastrated animals. By day 21 postcastration, the prostatic water concentration (81.5%) was not significantly different from that of uncastrated rats. Unlike the prostate, the skeletal muscle did not significantly change the water concentration following castration. The 51Cr-EDTA space in the prostate was not significantly different in rats before and after castration. These results indicate that water imbibition in the rat prostate is associated with an active period of prostatic regression and that the change in the 51Cr-EDTA space during prostatic regression is not the major cause of water imbibition in the tissue. Therefore, the present findings suggest that castration-induced water imbibition in the rat prostate is caused by an increase in the intracellular water space.     

Angiographischer Nachweis und Embolisation einer hämodynamisch wirksamen Blutung aus der rechten Arteria dorsalis penis bei Symphysenruptur

Pelvic fractures are frequently complicated by concomitant vascular lacerations involving, particularly, branches originating from the internal iliac arteries. Massive hemorrhage may be difficult to be treated surgically. In such cases interventional radiology can be helpful and able to treat definitely extensive hemorrhage caused by pelvic trauma.     

Epidemiologie, Diagnostik und Prävention

Hepatocellular carcinoma (HCC) is one of the most common cancers worldwide. Its diagnosis is based on clinical examination, including ultrasound, laboratory analyses, as well as determination of the tumour marker alpha-fetoprotein (AFP). If evidence for HCC is present, further imaging techniques (CT, MRI), and, if required, histopathological examination are necessary. The most important risk factors are chronic hepatitis B, C, and D, metabolic liver diseases, especially hereditary hemochromatosis, toxins (alcohol, aflatoxin) and states of insulin resistance. This knowledge provides us with strategies for HCC prevention that are of great clinical significance, in particular because, in spite of recent advances, the current therapeutic options for most patients remain very limited.     

Leberzirrhose: Prävention

Risk factors for the development of liver cirrhosis include toxins, chronic hepatitides and metabolic liver diseases. This knowledge has led to prevention strategies: avoiding exposure, vaccination against hepatitis B, and the early determination of hereditary liver diseases (e.g. hemochromatosis). The early use of effective treatment for chronic liver disease (e.g. immunosuppression, bloodletting, elimination of copper) allow, in part, the avoidance of later, irreversible sequelae such as the development of hepatocellular carcinoma. The therapy for chronic hepatitis B and C is becoming increasingly efficient and individualized. Nevertheless, it leads to complete virus suppression/elimination only in some patients; additional antiviral substances are being examined in clinical studies. In cases of acute HCV infection, contact with a hepatology clinic should be made due to possible involvement in a clinical study. In cases of chronic hepatitis D, the indications for antiviral therapy should only be made in cooperation with such a clinic.     

Virulence determinants of Escherichia coli O6 extraintestinal isolates analysed by Southern hybridizations and DNA long range mapping techniques.

A total of 16 Escherichia coli O6 strains isolated from cases of extraintestinal infections were analysed for the genetic presence and phenotypic expression of fimbrial adhesins (P, S/FIC, type 1), aerobactin and hemolysin. In addition restriction fragment length polymorphisms (RFLPs) of Xbal-cleaved genomic DNA of seven selected strains, separated by orthogonal field alternation gel electrophoresis (OFAGE) were determined and virulence-associated DNA probes were used for Southern hybridization studies of the Xbal-cleaved genomic DNAs. The virulence characteristics and hybridization patterns obtained differed between the various isolates. In three isolates hemolysin genes and P fimbrial determinants were located on the same Xbal fragments. Furthermore, multiple copies of FIC determinants (foc) could be detected in two strains. Our data show that the new technique of pulse field electrophoresis together with Southern hybridization represents a powerful tool for the genetic analysis of pathogenic bacteria.     

The role of the human acetylation polymorphism in the metabolic activation of the food carcinogen 2-amino-3-methylimidazo[4,5-f]quinoline (IQ).

The metabolic activation of the heterocyclic food carcinogen 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) by two human cytochrome P450 monoxygenases (P4501A1 and P4501A2) and two human N-acetyltransferases (NAT1 and NAT2) was investigated. Various combinations of these enzymes were functionally expressed in COS-1 cells. DNA adducts resulting from the activation of IQ were assayed quantitatively by the 32P-postlabeling procedure. The highest adduct frequency was observed in cells expressing both CYP1A2 and NAT2. CYP1A2 in combination with NAT1 was 3-6 times less active. When expressed alone these enzymes gave rise to low adduct frequencies. Experiments with N-acetyl-IQ as substrate suggest that NAT1 and NAT2 in addition to their known role in N-acetylation display arylhydroxamic acid N, O-acetyltransferase (AHAT) activity. Quantitative differences in adduct formation between IQ and N-acetyl-IQ indicated that metabolic activation of these arylamines preferentially occurs by P4501A2-catalyzed N-hydroxylation followed by O-acetylation mediated through NAT1 and/or NAT2. These data, in combination with the known genetic polymorphism of NAT2, may explain the clinical observation that the acetylation polymorphism constitutes a risk factor in the carcinogenic activation of environmental mutagens.     

Demographic and risk factors associated with chronic dieting in adolescents

A comprehensive, school-based survey was administered to 36,320 Minnesota public school students in grades 7 through 12 during the 1987-1988 school year. Self-reported chronic dieting was much higher in girls than in boys (12.1% of all girls vs 2.1% of boys). For girls, the percentage of chronic dieters was significantly less in grades 7 and 8 (7.8%) than in grades 9 and 10 (13.5%) or grades 11 and 12 (14.3%). There were no differences among urban, suburban, or rural youth. Black girls were less likely to diet compared with white girls. Chronic dieters were more likely than other students to report maladaptive weight-loss techniques, such as self-induced vomiting (relative risk, 9.92 for girls and 9.40 for boys), laxative use (relative risk, 7.18 for girls and 11.00 for boys), ipecac use (relative risk, 8.33 for girls and 11.00 for boys), and diuretic use (relative risk, 7.30 for girls and 13.5 for boys). It is suggested that chronic dieting may serve as a screening marker for more severe eating and weight-loss behaviors.