Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.2.1.31 (beta-glucuronidase)
 7,680 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Praziquantel, a new anthelmintic drug with activity against all species of schistosomes pathogenic to man, and against a wide range of Cestodes, was tested for mutagenic potential. For the detection of both base substitutions and frameshift mutations, Salmonella typhimurium TA 100 and TA 98 were used as tester strains. Using the plate assay with and without added S-9, host-mediated assay and urine-mediated assay without and after incubation with beta-glucuronidase/arylsulfatase, no mutagenic activity could be detected.
Arch Toxicol 1977 Sep 28
PMID:Mutagenicity studies with praziquantel, a new anthelmintic drug: tissue-, host-, and urine-mediated mutagenicity assays. 33 17

The aglycone methylazoxymethanol of the naturally occurring carcinogenic glucoside, cycasin, has previously been shown to be mutagenic, but cycasin per se has not. In this work, cycasin was demonstrated to be mutagenic using a modification of the Ames Salmonella test in which it was preincubated with beta-glucosidase and the tester strain in liquid medium. The mutagenicity of cycasin to six histine-depedent Salmonella strains varied considerably with strain HisG46 being the most susceptible. Methylazoxymethyl-beta-D-glucosiduronic acid, which also is nonmutagenic per se, similarly became mutagenic when preincubated with beta-glucuronidase. Methylazoxymethyl acetate, which is slightly mutagenic by the Ames standard pour plate method, became highly mutagenic on preincubation. The mutagenicity of free methylazoxymethanol was confirmed, and a linear dose-response relationship was observed. The common conditions required for activation of nonmutagenic methylazoxymethanol conjugates, the glucoside cycasin and methylazoxymethyl-beta-D-glucosiduronic acid, are 90-min preincubation at 30 degrees, pH 6.5, with an appropriate hydrolase and Salmonella typhimurium HisG46.
Cancer Res 1979 Sep
PMID:Mutagenicity of the naturally occurring carcinogen cycasin and synthetic methylazoxymethanol conjugates in Salmonella typhimurium. 38 89

The growth of L 1210 leukemia in DBA/2 strain mouse, provokes in the grafted animals intraleucocytic enzymatic modifications. As increase of acid phosphatase and a decrease of beta-glucuronidase were observed in the lymphocytes, the level of polymorphonuclear non-specific esterase being decreased. The implications of these modifications in the host response toward the tumor is discussed.
C R Acad Hebd Seances Acad Sci D 1977 Sep 26
PMID:[Cytochemical study of leucocytes of DBA/2 Mice after leukemia L1210 tumor graft]. 41 May 51

The purpose of the present study was to investigate whether three different types of dietary fiber, wheat bran, carrot fiber, and citrus pectin, influenced the induction of colorectal tumors produced by 1,2-dimethylhydrazine in rats. In all groups, the tumor yield was high (87 to 97%). In the wheat bran and carrot fiber groups, the incidence of colorectal tumors was not significantly different from that of the group fed on the fiber-free basic diet. The citrus pectin group, however, had a significantly higher incidence of colorectal tumors (p less than 0.001). An increased number of auditory duct tumors was also noted in this group. In a separate experiment, dietary pectin induced a 10-fold increase in fecal beta-glucuronidase activity but did not alter this activity in the bowel wall. It has been suggested that dietary fiber protects against the induction of colorectal tumors, but this was not the case in the experiment. It is possible that the high tumor yield made the demonstration of a weak protective effect of wheat bran impossible. The reason for the increased occurrence of tumors in the citrus pectin group is obscure and will be subjected to further investigation. Fecal beta-glucuronidase activity might be one factor of importance in the activation of the carcinogen.
Cancer Res 1979 Sep
PMID:Effect of dietary fiber on the induction of colorectal tumors and fecal beta-glucuronidase activity in the rat. 47 99

Dogs were given gentamicin (10 mg/kg) intramuscularly every 8 hr for 10 days. Levels of serum creatinine rose by day 6 (0.91 +/- 0.08 vs. 0.75 +/- 0.02 mg/dl for controls, P less than 0.05) and of blood urea nitrogen by day 8 (24.3 +/- 4.80 vs. 16.1 +/- 0.90 mg/dl for controls, P less than 0.05). Gentamicin nephrotoxicity occurred earlier and was more marked when furosemide (2 mg/kg) was added: the level of serum creatinine by day 6 was 1.62 +/- 0.25 mg/dl (P less than 0.05), and the level of blood urea nitrogen by day 8 was 181 +/- 23.5 mg/dl (P less than 0.01). Elevations in the activities of the urinary enzymes beta-glucuronidase, N-acetyl-beta-glucosaminidase, and muramidase preceded rises in levels of serum creatinine and blood urea nitrogen. Examination of serial percutaneous renal biopsy specimens showed that gentamicin administration was associated with hyaline droplet degeneration, lysosomal changes, and, later, cell necrosis (primarily of the proximal tubules). Changes in renal morphology were more severe and occurred earlier when furosemide was administered concomitantly. In summary, furosemide enhanced gentamicin nephrotoxicity. Enzymuria was an early sign of gentamicin nephrotoxicity.
J Infect Dis 1979 Sep
PMID:Furosemide enhancement of experimental gentamicin nephrotoxicity: comparison of functional and morphological changes with activities of urinary enzymes. 50 Nov 48

Twenty-two cat hearts were perfused according to Langendorff technique and myocardial regional ischemia was induced by occlusion of left anterior coronary artery. Separation of particulate (bound) from soluble (free) fraction, and subsequent fractionation into plasma membranes, lysosomes, sarcoplasmic reticulum, and mitochondria were performed by sucrose density gradient ultracentrifugation. By ischemia for 60 min, particle-bound activity of cathepsin D decreased from 4.2 +/- 0.24 U/mg protein to 3.2 +/- 0.31 U/mg protein (p less than 0.01). Likewise, the particle-bound activity of beta-glucuronidase decreased from 11.9 +/- 0.92 U/mg protein to 6.2 +/- 1.28 U/mg protein (p less than 0.01). Accordingly, free/bound activity ratios of cathepsin D increased from 0.8 to 1.9 and beta-glucuronidase from 0.9 to 2.8, respectively. Conspicuous fall from 12.8 +/- 0.6 U/mg protein to 8.0 +/- 0.97 U/mg protein (p less than 0.01) in absolute specific activity of cathepsin D bound to the lysosomal fraction, presents definitive evidence of lysosomal release of the acid hydrolases during the early phase of myocardial ischemia. Electron microscopic observation of the ischemic myocytes revealed ultrastructural alterations of the lysosomes suggestive of autophagic degradation of various subcellular organelles.
Jpn Heart J 1979 Sep
PMID:Lysosomal hypothesis in evolution of myocardial infarction. Subcellular fractionation and electron microscopic cytochemical study. 50 30

Serum beta-glucuronidase (S beta G) activity was investigated as an early indicator of diabetes in pregnant women. The enzyme activity was determined in the sera of three groups: nonpregnant women (18 to 40 years old) with and without glucose intolerance, pregnant women with and without glucose intolerance, and pregnant women with a family history of diabetes. The S beta G activity values (means +/- SD) in normal pregnant women were 603 +/- 223, 872 +/- 270 and 1,336 +/- 353 Fishman units during the three trimesters, respectively. A slight increase in S beta G activity was found in the sera of healthy pregnant women with a family history of diabetes during the first and second trimesters. High values of S beta G (2,765 +/- 392 units) were found in all stages of pregnancy in diabetic women. Thus, the determination of S beta G activity may be a valuable aid in the early detection of reduced glucose tolerance in pregnancy.
Isr J Med Sci 1979 Sep
PMID:Serum beta-glucuronidase activity during pregnancy in gestational diabetes. 51 12

The influence of castration, androgen replacement therapy and cyproterone acetate on the activity of beta-glucuronidase, acid and alkaline phosphatases and glucose-6-phosphate dehydrogenase was studied in the caput, corpus and cauda epididymidis of the mouse. The results add further evidence that the epididymis is not uniform but has regional differences in activity. Thus beta-glucuronidase was found to be androgen-dependent only in the cauda epididymidis, whereas glucose-6-phosphate dehydrogenase was under androgenic control in the caput epididymidis. The response of alkaline and acid phosphatases to castration and to androgen replacement was different in different segments.
J Reprod Fertil 1979 Sep
PMID:Effects of castration, 5 alpha-dihydrotestosterone and cyproterone acetate on enzyme activity in the mouse epididymis. 51 8

1. Incubation of rabbit tracheal explants with N-[(3)H]acetyl-d-glucosamine and N-acetyl-d-[1-(14)C]glucosamine led to labelling of a number of soluble macromolecular products separable from the medium, after papain digestion, by ion-exchange chromatography. 2. With N-acetyl-d-[1-(14)C]glucosamine in the incubation medium, a neutral glycoprotein, two acidic glycoprotein fractions, hyaluronic acid and a glycosaminoglycan fraction were obtained and all were radioactively labelled. Similar labelling occurred with N-fluoroacetyl-d-[1-(14)C]glucosamine or N-fluoro[(3)H]acetylglucosamine as precursor. 3. Maximal labelling was obtained at 96h after incubation of cultures. N-Fluoroacetyl-glucosamine under these conditions was incorporated into hyaluronate less efficiently than N-acetylglucosamine. 4. With N-fluoroacetyl-d-[1-(14)C]glucosamine as precursor, a hyaluronate component was separated that on enzymic degradation by glycosidases (hyaluronidase, beta-glucuronidase and N-acetyl-beta-hexosaminidase) yielded a (14)C-labelled oligosaccharide fraction together with N-acetyl-d-[1-(14)C]glucosamine and N-fluoroacetyl-d-[1-(14)C]glucosamine, consistent with some exchange of N-acetyl groups having occurred. 5. The results on enzymic degradation of labelled macromolecules by glycosidases suggest that the presence of incorporated N-fluoroacetyl side chains may render the hyaluronate analogue more resistant to hyaluronidase.
Biochem J 1979 Sep 15
PMID:Incorporation of N-fluoroacetyl-D-glucosamine into hyaluronate by rabbit tracheal explants in organ culture. 51 60

A comparative study was made of the total lysosomal enzyme activity found in homogenates of normal ectocervical squamous epithelium and squamous carcinoma of this epithelium. The activities of acid phosphatase, beta-glucuronidase, cathepsin D and acid ribonuclease were higher in carcinoma tissue than in normal tissue. The most important observation made was with regard to the distribution of enzyme activity in homogenates. In carcinoma homogenates most of the enzyme activity was detected in the lysosomal fractions, whereas in controls the activity was predominantly found in the cytosol fractions. No histochemical and electron microscopical techniques were used in this study. Because it was possible to sediment the enzyme activity and to demonstrate latency, these can be referred to as lysosomal enzymes with certainty.
S Afr Med J 1978 Sep 23
PMID:[A comparism between lysosomal enzyme activity in normal ectocervical squamous epithelium and squamous carcinoma of the ectocervix]. 56 9


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