Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.1.3.1 (alkaline phosphatase)
 47,916 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Urinary enzyme activities (N-acetyl-beta-D-glucosaminidase [NAG], alkaline phosphatase [ALP], leucine aminopeptidase [LAP], gamma-glutamyl transpeptidase [gamma-GTP]) were investigated to determine their clinical significance in diabetic nephropathy. There were correlations among ALP, LAP, and gamma-GTP, though no correlation existed between NAG and the other three enzymes. Activities of NAG isozymes (both A and B) were higher than in normal controls. It has been reported that NAG isozyme A might be associated with glomerular diseases, and isozyme B might be associated with proximal tubular damage. The results of our study suggest that NAG reflects lysosomal dysfunction of both glomerular and proximal tubular epithelial cells, which may be caused by poor glycemic control, and that ALP, LAP, and gamma-GTP reflect brush border damage of proximal tubules, which may be caused by diabetic nephropathy.
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PMID:Clinical significance of urinary enzymes in diabetic nephropathy. 168 60

Chlordecone (CD) treatment of rat liver plasma membranes (LPM) provided in vitro evidence for mechanisms of in vivo liver dysfunction caused by CD. LPM preparations enriched 14- to 19-fold in the bile canalicular markers gamma-glutamyl transpeptidase, alkaline phosphatase, and leucine aminopeptidase were isolated from male Sprague-Dawley rats. CD inhibited the bile canalicular-specific active transport of Na(+)-stimulated L-[3H]glutamate in LPM vesicles. CD (0.08 and 0.5 mumol/mg protein) reduced both the initial velocity and the maximum level of Na(+)-stimulated L-[3H]glutamate uptake without significantly reducing Na(+)-independent uptake. In vitro treatment of LPM with CD (0.2-1.0 mumols/mg protein) also reduced the mobility of a 16-doxyl stearate spin label probe in a concentration-dependent manner. No change in mobility was apparent at CD concentrations below 0.2 mumol/mg protein. These results demonstrated that CD impaired a bile canalicular-specific transport system and induced liver plasma membrane perturbation. Na(+)-stimulated L-[3H]glutamate uptake was more sensitive to CD than was detectable immobilization of the spin label probe.
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PMID:Chlordecone impairs Na(+)-stimulated L-[3H]glutamate transport and mobility of 16-doxyl stearate in rat liver plasma membrane vesicles. 169 98

Dose- and time-related effects of Cd (II) (0.5 or 1.0 mg/kg, Cd as CdCl2.H2O, subcutaneously, daily for 48 h, 1, 3, or 6 wk) were investigated in rats. A dose-related increase in the activity of plasma alkaline phosphatase (ALP), lactate dehydrogenase (LDH), aspartate aminotransferase (GOT), and alanine aminotransferase (GPT) was evident only at 6 wk, whereas an early rise in ALP and LDH was seen at 3 wk in 1.0 mg Cd group only. The hepatic and renal metallothionein (MT) induction displayed a dose- as well as time-related increase with Cd accumulation. A significant increase in hepatic Zn and renal Cu, no change in hepatic Cu, and a slight increase in renal Zn was observed. Urinary ALP and leucine aminopeptidase (LAP) showed an initial increase at 48 h, thereafter returned to near normal. A second phase of enzymuria (ALP, LAP, GOT, GPT, gamma-glutamyl transpeptidase), proteinuria, and aminoaciduria occurred at 6 wk in a dose-related manner. The urinary excretion of specific renal enzymes appeared closely related to the MT induction and organ Cd levels.
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PMID:Biochemical response to cadmium. Dose-time effect. 171 72

Enzymatic profiles were determined by the API ZYM system for 15 strains of non 01 Vibrio cholerae, 4 strains of V. metschnikovii, 9 strains of V. anguillarum, 6 strains of Plesiomonas shigelloides and 115 strains motile Aeromonas sp. All of the tested strains produced alkaline phosphatase, leucine aminopeptidase and did not possess alpha-fucosidase and alpha-mannosidase. Some differences in enzymatic activities among the tested Vibrionaceae strains were noted. The strains of non 01 V. cholerae, V. metschnikovii, V. anguillarum and P. shigelloides did not produce trypsin, whereas all of the tested Vibrio sp. strains appeared to be positive for this enzyme. Only the strains of P. shigelloides produced BI-Phospho-hydrolase. The lack of acid phosphatase activity was observed among the strains of V. anguillarum.
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PMID:Enzymatic characterization of Vibrionaceae strains isolated from environment and cold-blooded animals. 172 94

Single intraperitoneal injections of three, seven, or 10 mg. of sodium oxalate per 100 gm. of rat body weight were administered to male Sprague-Dawley rats. At various times after the injection, urine samples were analyzed for oxalate, and urinary enzymes, alkaline phosphatase, leucine aminopeptidase, gamma-glutamyl transpeptidase, and N-acetyl-beta-glucosaminidase. The kidneys were processed for light microscopy and renal calcium and oxalate determination. Oxalate administration resulted in an increase in urinary oxalate and formation of calcium oxalate crystals in the kidneys. The amount and duration of urinary excretion of excess oxalate and retention of crystals in the kidneys correlated with the dose of sodium oxalate administered. At a low oxalate dose of three mg./100 gm., crystals moved rapidly down the nephron and cleared the kidneys. At higher doses crystals were retained in kidneys and at a dose of 10 mg./100 gm. were still there seven days post-injection. Crystal retention was associated with enhanced excretion of urinary enzymes indicating renal tubular epithelial injury.
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PMID:Acute hyperoxaluria, renal injury and calcium oxalate urolithiasis. 172 37

Paired xenografts of near-term fetal rabbit jejunum were subcutaneously implanted in the backs of athymic nude (nu/nu) mice. At 3 to 4 weeks post-implantation, the grafts had histologic, ultrastructural, and biochemical (lactase, sucrase, alkaline phosphatase, leucine aminopeptidase) parameters comparable to age-matched control rabbits. Four weeks post-transplantation the xenografts were intraluminally inoculated with various strains of lapine attaching and effacing E. coli or group A rotavirus. Infection with 2 strains of E. coli resulted in typical light microscopic and ultrastructural lesions of attachment and effacement. Immunohistochemical analysis of rotavirus-infected xenografts demonstrated rotavirus antigen within enterocytes. These lesions are comparable to those in conventional rabbits. Intestinal xenografts are a novel, highly controlled, and reproducible model which may have unique applications in the study of enteric diseases. The model provides anatomically and biochemically correct intestinal mucosal epithelium uncomplicated by variables such as enteric flora, host immune response, gastric, hepatic, and pancreatic secretions and is susceptible to infection by specific enteropathogens. Xenografts, therefore, may be a viable alternative in certain investigations where whole animals, ligated intestinal loops, organ cultures, or cell cultures might otherwise be chosen.
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PMID:Development, characterization, and utilization of an intestinal xenograft model for infectious disease research. 175 15

The biological function of zinc is governed by the composition of its tetrahedral coordination polyhedron in the metalloprotein, and each ligand group that coordinates to the metal ion does so with a well-defined stereochemical preference. Consequently, protein-zinc recognition and discrimination requires proper chemical composition and proper stereochemistry of the metal-ligand environment. However, it should be noted that the entire protein behaves as the "zinc ligand," since residues that are quite distant from the metal affect recognition and function by through-space (either solvent or the protein milieu) or through-hydrogen bond coulombic interactions. Additionally, long-range interactions across hydrogen bonds serve to orient ligands and therefore minimize the entropy loss incurred on metal binding. Since zinc is not subject to ligand field stabilization effects, it is easy for the tetrahedral protein-binding site to discriminate zinc from other first-row transition metal ions: It is only for Zn2+ that the change from an octahedral to a tetrahedral ligand field is not energetically disfavored. Structural considerations such as these must illuminate the engineering of de novo zinc-binding sites in proteins. Zinc serves chemical, structural, and regulatory roles in biological systems. In biological chemistry zinc serves as an electrophilic catalyst; that is, it stabilizes negative charges encountered during an enzyme-catalyzed reaction. The coordination polyhedron of catalytic zinc is usually dominated by histidine side chains. In biological structure zinc is typically sequestered from solvent, and its coordination polyhedron is almost exclusively dominated by cysteine thiolates. Structural or regulatory zinc is found as either a single metal ion or as part of a cluster of two or more metals. In multinuclear clusters cysteine thiolates either bridge two metal ions or serve as terminal ligands to a single metal ion. Even in complex multinuclear clusters, Zn2+ displays tetrahedral coordination. The structural biology of zinc continues to receive attention in catalytic and regulatory systems such as leucine aminopeptidase, alkaline phosphatase, transcription factors, and steroid receptors. For example, zinc-mediated hormone-receptor association has recently been demonstrated in the binding of human growth hormone to the extracellular binding domain of the human prolactin receptor (Cunningham et al., 1990). To be sure, structural studies of zinc in biology will continue to be a fruitful source of bioinorganic advances, as well as surprises, in the future.
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PMID:Structural biology of zinc. 179 7

Renal functional status in Mycobacterium leprae infected mice can be best studied by examining the enzymatic status of brush border membrane vesicles from proximal convoluted tubule. The role of vaccination in modulation of the renal status brought by the disease has been studied using this technique. The characteristic marker enzymes of renal brush border membrane--namely alkaline phosphatase, leucine aminopeptidase and gamma-glutamyl transpeptidase decreased significantly (p less than 0.01) in due course in M. leprae infection over a period of 9 months. The combined vaccine (BCG + M. leprae) may have a protective effect on renal abnormalities only in the initial stages of infection as indicated by a significant rise in enzymatic levels. However, no significant (p greater than 0.05) protective effect of vaccine was found in a more advanced disease state after 9 months in infected mice.
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PMID:Does Convit vaccine (BCG + Mycobacterium leprae) afford protection against biochemical changes in renal brush border membrane in experimental leprosy? 179 85

Oral administration of the antiulcerogenic drug, cimetidine, was studied on kidney-bound hydrolytic enzymes at three different dose levels (30 mg, 100 mg, and 2000 mg/kg body weight) and for single administration for 2 and 24 h, and daily administration for 15 days in mice. It significantly inhibited Na+, K(+)-ATPase, Mg(2+)-ATPase, and Ca2+, Mg(2+)-ATPase in the isolated basolateral membrane (BLM). Brush-border-membrane-(BBM)-associated enzymes, sucrase, lactase, maltase, leucine aminopeptidase, and alkaline phosphatase also showed a marked reduction. Substrate saturation kinetics revealed the nature of inhibition was of mixed type in the case of sucrase, lactase, maltase, and alkaline phosphatase (Km was increased, while Vmax decreased), whereas it was of non-competitive type for leucine aminopeptidase (Km was unchanged, while Vmax decreased). In vitro addition of cimetidine (5-20 mM) to the BBM also inhibited the enzyme activity. Dixon plot produced the inhibition constant (Ki) for cimetidine in the case of maltase, alkaline phosphatase, and leucine aminopeptidase in the order of 14.83, 32.83 and 11.5 mM, respectively. Analysis of lipids revealed a significant reduction in BBM-associated phospholipid and phospholipid/cholesterol molar ratio, while the neutral lipid fraction, i.e., cholesterol and triglycerides were not altered. Free fatty acid exhibited an increase after drug treatment, which was significant at higher dose after 24 h of single and 15 days of daily treatment. BLM-associated lipids did not exhibit any significant change. Cimetidine-induced depression in renal BLM- and BBM-associated disaccharidases and ATPases, at least at the higher dose level, may have serious consequences in the absorption of end-product nutrients.
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PMID:Depression of membrane-bound hydrolases by cimetidine in mouse renal basolateral and brush border. 183 34

Plasma components of 6 to 12-month-old beagles were examined using a Technicon auto-analyzer. Age-related changes were noted for 8 of the 21 components: the levels of total protein (T. Pro) and iron (Fe) gradually increased while those of alkaline phosphatase (ALP), creatine phosphokinase (CPK) and inorganic phosphorus (Pi) persistently decreased in both sexes. Triglyceride (Trigly) in female dogs, glutamic-pyruvic transaminase (GPT) and urea nitrogen (Urea-N) in male dogs tended to increase. The following thirteen components showed no significant variation during the period of observation: glucose (Glu), lactic dehydrogenase (LDH), albumin (Alb), creatinine (Crea), glutamic-oxaloacetic transaminase (GOT), leucine aminopeptidase (LAP), total bilirubin (T. Bil), amylase (Amy), total cholesterol (T. Chol), sodium (Na), potassium (K), chloride (Cl) and calcium (Ca). Our results generally agree with the reported findings on beagles from various institutions.
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PMID:Plasma biochemistry values of young beagle dogs. 188 72


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