Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.2.1.23 (beta-galactosidase)
 14,648 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Antibodies bound to the surface of Escherichia coli cells stimulate the rate of growth of these bacteria in proportion to their quantity. This "cytostimulation" of the bacteria is confirmed by (1) the increase in optical density, (2) colony counts and (3) increase in the beta-galactosidase activity of a constitutive strain. This action can be amplified by overlaying the antibodies bound to the bacteria, with anti-antibodies. The cytostimulation is accompanied by an increase of the ratio in phosphatidylglycerol to diphosphatidyl-glycerol in the bacteria.
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PMID:[Bacterial cytostimulation by specific antibodies (author's transl)]. 5 Jul 58

Activities of acid phosphatase, beta-glucuronidase, N-acethyl-beta-D-glucosaminidase and acid beta-galactosidase were investigated histochemically in rabbit corneas. Frozen sections after block fixation in cold 4% formaldehyde with 1% CaCl2 followed by washing in cold physiological saline as well as cold microtome sections of corneas quenched in petroleter chilled with acetone-dry ice mixture, transferred to nonprecooled slides or semipermeable membranes were used. Standard aqueous media were employed in the case of free-floating frozen sections of fixed corneas as well as of cold mictrotome sections (postfixed in cold 4% formaldehyde). Agar media were used in connection with the technic of semipermeable membranes. Gomori method (in the case of acid phosphatase), simultaneous azocoupling methods (substrates derivated of naphthol-AS-BI with hexazonium-p-rosanilin) in the case of acid phosphatase, beta-glucuronidase and N-acetyl-beta-D-glucosaminidase and the indigogenic method in the case of acid beta-galactosidase were applied. Enzyme activities in sections of fixed corneas were minimal in comparison with those in cold microtome sections of unfixed material revealed particularly with the technic of semipermeable membranes which is to be preferred. This technic is recommended in studies concerned with lysosomal enzymes in the cornea, particularly in keratocytes. All enzymes investigated were present in corneal epithelium, keratocytes and endothelium. Acid phosphatase displayed the highest activity followed by beta-glucuronidase and acetyl-beta-D-glucosaminidase. The activity of beta-galactosidase was the lowest. For the demonstration of activities in keratocytes sections parallel to the surface are very suitable. In these sections enzyme activities were demonstrated in small granules (apparently lysosomes) present in the central part of their cytoplasm as well as in projections. Diffuse staining was also seen, being the highest in the case of acid phosphatase.
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PMID:Distribution of acid phosphatase, beta-glucuronidase, n-acetyl-beta-d-glucosaminidase and beta-galactosidase in cornea of albino rabbit. 5 44

The distributions of acid alpha1-glycoprotein, alpha1-fetoprotein, beta-galactosidase and gastrin in gastric carcinoma and gastric ulcer as well as in the neighbourhood of these lesions were studied by means of immunohistochemical methods on imprint preparation. We could not find significant differences between gastric carcinoma and the nonneoplastic lesions, except for the acid alpha1-glycoprotein. The results of this first study indicate that the immunochemical and immunohistological assay of acid alpha1-glycoprotein might be of practical value in diagnosing malignant changes of gastric mucosa.
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PMID:[Immunohistochemical studies on non neoplastic and neoplastic gastric mucosa. Determination of embryonic and specific antigens (author's transl)]. 5 51

In alkali burned rabbit cornea the stainability of glycosaminoglycans in cold microtome setions was investigated. Staining by Alcian blue in 3% acetic acid, Alcian blue in various MgCl2 concentration and toluidine blue (pH 4.5) was employed. From the 1st to the 4th experimental day the intensity of reactions was decreased. This is most probably due to an increased hydration of the corneal stroma. On the 7th day hydration was markedly suppressed and reached nearly the normal level. In this time interval a decreased stainability of glycosaminoglycans was seen accompanied by a complete loss of staining in the marginal zone. On the 14th day the stainability in the traumatized area began to restore and in the marginal zone appeared. On the 32nd day the staining intensity of both areas was normalised, however when lower concentrations of MgCl2 were used; in the presence of higher concentrations of MgCl2 the decreased staining intensity persisted and points to a lower sulfatation of glycosaminoglycans. This was particularly remarkable in the area bordering the injured zone. This decrease runs parallel to the increased activities of acid glycosidases (especially of acid beta-galactosidase) which were reported previously.
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PMID:Alkali burns of the rabbit cornea. II. A histochemical study of glycosaminoglycans. 5 22

Provision of beta-galactosidase (GZ) under defined conditions of dose and time can either help or suppress a subsequent response to trinitrophenyl (TNP)-GZ in CBA/J mice. The optimal helper effect occurs when 10(7) spleen cells from mice primed 9 or more days previously with 10 mug GZ are adoptively transferred to irradiated recipients which are than challenged with 10 mug TNP50GZ. Optimum suppression results from the transfer of spleen cells from mice primed 3 days previously with 100 mug GZ and challenge of recipients with TMP150GZ. Both help and suppression are carrier-specific and mediated by T cells. In experiments where helper or suppressor cells were mixed with normal cells, the anti-TNP response was proportional to the number of primed cells transferred. The results point to a wave of suppression as the initial event after immunization, which is succeeded by period in which the helper effect dominates.
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PMID:Modulation of help and suppression in a hapten-carrier system. 5 97

The results reported in this paper demonstrate that the enumeration of cells binding beta-galactosidase (Z) as an antigen, revealed by subsequent substrate hydrolysis, is an excellent method for the detection and study of antigen-binding cells (ZBC). The binding found is specific and is restricted to a small number of lymphocytes that bind a large number of Z molecules via surface receptors. Such ZBC were found at mean frequencies of 150 per 10(6) in the thymus and 200 to 300 per 10(6) in the spleen. The binding cells of both organs were heterogenous with individual ZBC binding from 10(5) to 10(6) molecules of enzyme as determined by substrate hydrolysis, although this might well be an overestimate of the number of actual receptors. The profiles for the frequency of ZBC binding different numbers of molecules were nearly identical for thymus and spleen, in contrast to descriptions of the binding of many other antigens. Receptors responsible for Z binding appear to be superficially located on the cell since they are trypsin-sensitive to a large extent and are not increased by fixation.
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PMID:Characterization of T and B antigen-binding cells for beta-galactosidase. I. beta-galactosidase-binding cells in the thymus and spleen of normal mice. 5 4

Spleen cells from mice immunized with E. coli beta-galactosidase were incubated with the enzyme and with 5-bromo-4-chloroindolyl-beta-galactosidase as a histochemical substrate. Some cells are stainable in this reaction, however, not all of them carry specific receptors for beta-galactosidases. Some spleen cells can take up dye and thereby become unspecifically stained. This system is therefore not suitable for the detection of antigen binding to cells.
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PMID:Histochemical staining in lymphocyte suspensions complexed with beta-galactosidase as an antigen. Unspecific staining of spleen cells by indigo. 5 38

Rotaviruses are now regarded as important causes of diarrhoea in man, cattle, pigs, mice, and possibly other animals. Characteristically, disease occurs in newborn and young animals, and infection seems limited to the differentiated gut epithelial cells. The major surface polypeptide of the calf scours rotavirus is glycosylated, and highly purified beta-galactosidase (lactase) interacts with the virus in vitro causing removal of the outer shell of the capsid (uncoating). It is suggested that lactase present in the brush border of the intestinal epithelial cell performs a similar function in vivo by acting as a combined receptor and uncoating enzyme for the rotavirus. This hypothesis is consistent with the observations that rotaviruses seem to infect only gut epithelial cells, and that infant animals, whose lactase concentrations are generally higher than those of adult animals, seem more susceptible to rotavirus infections. Implications of the hypothesis include possible new approaches to laboratory cultivation of rotaviruses, which should be more successful in cells selected for surface lactase activity, and the suggestion that the epidemiology of human rotavirus infections may be influenced by the fact that different ethnic groups have different lactase levels (and hence lactose intolerance) in adulthood.
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PMID:Is lactase the receptor and uncoating enzyme for infantile enteritis (rota) viruses? 5 21

This report concerns a 3-month-old girl with rapidly progressive psychomotor retardation, hepatomegaly, vacuolated lymphocytes, minimal bone dysplasia and normal excretion of acid mucopolysaccharides. A deficiency of acid beta-galactosidase was demonstrated in isolated leucocytes and in a liver biopsy. The diagnosis of generalized gangliosidosis due to deficiency of beta-galactosidase was also based on the absence of the enzyme activity from cultured fibroblasts. The diagnosis was confirmed on autopsy at 16 months by typical histology, electron microscopy and biochemistry of the organs. beta-galactosidase deficiency has been demonstrated in various clinical conditions ranging from generalized gangliosidosis with severe mental retardation to clinical pictures resembling Morquio's disease and normal intelligence. The heterogeneity of the clinical manifestations in beta-galactosidase deficiency could be explained by different residual activities of a structurally mutated enzyme towards its various substrates.
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PMID:Generalized gangliosidosis: acid beta-galactosidase deficiency with early onset, rapid mental deterioration and minimal bone dysplasia. 6 26

A total of 834 bacterial strains isolated from urine were subjected to rapid biochemical and serological identification and rapid antimicrobial sensitivity testing using Autobac 1. For enterobacteria (742 strains) six tests (acetoin-, beta-galactosidase-, hydrogensulphide-, indole-, ornithin-decarboxylase-and urease-production) correctly identified to genus or species level more than 99% of the strains within four hours. Staphylococci and streptococci (92 strains) were identified with full accuracy within two hours using a rapid deoxyribonuclease assay and immunoelectroosmophoresis and coagglutination. The overall accuracy for the automated antibiotic susceptibility testing using Autobac was 93% as compared to the standard plate diffusion method. In terms of rapidity for 91% of the bacterial strains the susceptibility testing was completed within four hours. After five hours 99% of the strains were analysed. Our data indicate that rapid and automated assays can be accurate and furnish the physician with adequate data within 24 hours after receipt of a urinary specimen.
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PMID:Rapid identification and antibiotic sensitivity testing of bacteria isolated from clinical infections. 6 55


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