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E Gutjahr

Publications and source records attributed to E Gutjahr.

9 recordsLinked to original sources
PubMed2001

Defining alcohol-related fatal medical conditions for social-cost studies in western societies: an update of the epidemiological evidence.

OBJECTIVES: To elaborate a state-of-the-art list of alcohol-related fatal medical conditions for future social-cost studies in Western societies. METHODS: Three major social-cost studies were compared with regard to their respective section on fatal health effects attributable to long-term as well as short-term use of alcohol. On discordant conditions, a systematic literature search was conducted in the Medline and ETOH databases. RESULTS: There is no consensus between social-cost studies with respect to alcohol-related causes of mortality. Based on the recent epidemiological evidence on alcohol and health, this paper suggests an up-to-date list of fatal medical conditions for which the causal relationship has been established with sufficient scientific evidence. A further investigation is needed, however, to reestimate relative risks by meta-analysis. CONCLUSIONS: Evaluating new epidemiological evidence regularly is necessary for the purpose of up-to-date social-cost studies.

Alcohol-Related Disorders↗
PubMed2001

[Method determines results: indirect economic costs of alcohol abuse and alcoholism in Switzerland].

OBJECTIVE: The present contribution aims at illustrating the methodological problems that may arise from investigating the indirect social costs of alcohol consumption. METHODS: In order to estimate the alcohol-related productivity losses through excessive morbidity, regression analysis was performed, using data from the 2(nd) Swiss Health Survey (1997). For the purpose of sensitivity analysis two approaches were used (a) Rice and b) Harwood), and all models were calculated with and without smearing-adjustment as well as with and without adjustment for confounding variables. RESULTS: The present study shows that small changes in method may result in major variations in the estimated total costs. In monetary terms, the indirect costs for alcohol consumption in Switzerland through excess-morbidity were estimated at between 0.119 billion Francs (model Harwood, smearing-adjusted) and 2.175 billions Francs (model Rice, adjusted for confounding variables). CONCLUSION: Since many methodological problems in estimating the indirect costs of alcohol consumption have not been adequately resolved yet, results of those studies have to be interpreted with caution.

Alcohol-Related Disorders↗
PubMed2001

Relation between average alcohol consumption and disease: an overview.

OBJECTIVE: To conduct an overview of alcohol-related health consequences and to estimate relative risk for chronic consequences and attributable fractions for acute consequences. METHODS: Identification of alcohol-related consequences was performed by means of reviewing and evaluating large-scale epidemiological studies and reviews on alcohol and health, including epidemiological contributions to major social cost studies. Relative risks and alcohol-attributable fractions were drawn from the international literature and risk estimates were updated, whenever possible, by means of meta-analytical techniques. RESULTS: More than 60 health consequences were identified for which a causal link between alcohol consumption and outcome can be assumed. CONCLUSIONS: Future research on alcohol-related health consequences should focus on standardization of exposure measures and take into consideration both average volume of consumption and patterns of drinking.

Alcohol Drinking↗
PubMed1993

Effect of low-molecular-weight dextran on proteolytic and nonproteolytic lysosomal enzymes in isolated segments of rat proximal tubule.

Dextrans undergo glomerular filtration and are taken up by endocytosis into lysosomes of proximal tubule cells. We measured the activities of the intralysosomal proteolytic enzymes cathepsin B and L and the nonproteolytic acid phosphatase in microdissected segments of rat proximal tubules by means of fluorescent ultramicroassays. Cathepsin activities were increased following dextran injection in a dose-dependent manner. Cathepsin stimulation was not dextran-specific since enhanced proximal albumin uptake also increased cathepsin activities. Acid phosphatase remained almost unchanged. We conclude that increased proximal tubule uptake of macromolecules is accompanied by a rather specific stimulation of proteolytic enzymes in the lysosomes. For proteins this constitutes an adequate response to increased protein uptake to maintain the steady state between uptake and catabolism of proteins in lysosomes. For the nondigestible dextran the cathepsin induction is an inadequate response. Since lysosomal cathepsins are involved in breakdown of intracellular proteins, it is conceivable that the increased activities reflect increased cellular autophagy leading to proximal tubule damage.

Acid Phosphatase↗
PubMed1991

Alterations in lysosomal enzymes of the proximal tubule in gentamicin nephrotoxicity.

Gentamicin accumulates in proximal tubule lysosomes, increases their number, and changes their structure. An important lysosomal function is degradation of intracellular proteins. To evaluate the effect of gentamicin on this lysosomal function, we measured the activity of the key lysosomal proteinases, cathepsin B and L, in microdissected S1, S2, and S3 segments of rat proximal tubules by means of a fluorometric microassay. The cathepsin activities were decreased in S1 and S2 following one and four gentamicin injections of 100 mg/kg body weight. The lysosomal enzyme, acid phosphatase, was also measured and was not decreased by gentamicin. The urine excretion of cathepsins B and L was decreased after gentamicin. This excludes an increase in urinary loss of cathepsins as the cause of decreased tubule activity. Structural changes of the lysosomes per se were excluded as the factor responsible for the reduced cathepsin activity by demonstrating increased cathepsin B and L activity in proximal tubule segments from rats injected with dextran, since dextran induces an increase in number and size of proximal tubule lysosomes. In vitro incubation of urine and tubule segments with gentamicin demonstrated a concentration-dependent reversible inhibition of cathepsin B and L. We conclude that gentamicin per se decreased cathepsin B and L activities in proximal tubule segments as early as 24 hours following one injection due to either enzyme inhibition or reduced generation of active intralysosomal cathepsin B and L. Gentamicin may, therefore, reduce renal protein catabolism by decreasing the activity of the key proteolytic enzymes, cathepsin B and L. Since cathepsin B and L are proteolytic activators of other lysosomal enzymes, their reduced activity may also decrease the activities of other lysosomal enzymes.

Acid Phosphatase↗
PubMed1990

Effect of low molecular weight proteins and dextran on renal cathepsin B and L activity.

Renal extraction of low molecular weight proteins (LMWP) accounts for 30% to 80% of their total metabolic clearance. Extraction includes glomerular filtration, proximal tubular uptake, and intralysosomal proteolysis. To characterize the anatomic sites and enzymes involved in digestion of reabsorbed LMWP, the lysosomal proteases, cathepsin B and L, were measured by ultramicroassay in isolated S1, S2 and S3 segments of the proximal tubule of proteinuric rats. Increased glomerular filtration and tubular uptake of LMWP were induced by i.v. and i.p. injections of myoglobin and cationic and anionic lysozyme. Both cationic lysozyme and myoglobin increased cathepsin B and L activities in the proximal tubule, while anionic lysozyme had no effect. Morphologic examination of kidney tissue suggested that proximal tubular uptake of anionic lysozyme was negligible in comparison with the cationic form. Hence, only LMWP absorbed by the proximal tubule cells stimulated cathepsin B and L activities. Proximal tubular uptake of cationic lysozyme was determined by measurement of lysozyme activities in S1, S2, and S3. S1 segments contained the highest lysozyme activity, while S2 and S3 had much lower activities, and cathepsin B and L activity following cationic lysozyme injection was stimulated only in S1 segments. These results suggest that cathepsin B and L participate in lysosomal digestion of certain LMWP. Furthermore, the activities of cathepsin B and L adapt to increased uptake of LMWP. To gain additional insight into the mechanism of cathepsin adaptation, the cathepsin B and L activities were measured following injection of dextran with a similar low molecular weight.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1990

Alterations in proteolytic enzymes of the proximal tubule in a rat model of cyclosporine nephrotoxicity.

The presence of autophagolysosomes in proximal tubule cells and the increased urine excretion of the lysosomal enzyme N-acetyl-glucosaminidase following administration of cyclosporine suggests involvement of the lysosomes in tubular toxicity of CsA. To evaluate the effect of CsA on lysosomal function, the activity of the lysosomal proteinases cathepsin B and L was measured in microdissected segments of the proximal tubule by means of a fluorometric microassay. Rats received oral doses of 30 mg/kg CsA for eight weeks. Controls received olive oil. CsA reduced renal blood flow, glomerular filtration rate, and kidney weight. Hence, a second control group was included where the left renal artery was clipped to reduce RBF and GFR. CsA administration was accompanied by a 130% increase in cathepsin activities in the S1 segments of the proximal convoluted tubule. The activity remained unchanged in the pars recta. Enzyme activities in convoluted proximal tubules and pars recta from the control groups were not increased irrespective of reduced RBF, decreased GFR, and decreased KW. Hence, cathepsin B and L stimulation was induced by CsA per se. Since lysosomes are involved in cellular protein catabolism, the increased cathepsin activities may reflect an increased rate of protein breakdown. The tubular atrophy induced by CsA may be related to increased intracellular protein degradation.

Animals↗