Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: 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)

The effect of mercury on alkaline phosphatase, lipase, aminotripeptidase and glycylglycine dipeptidase in the liver and digestive tract of Channa punctatus is investigated in vitro. Mercury inhibits the activities of all these enzymes and the degree of inhibition increases with the increase in the concentration of the metal. Addition of EDTA, a chelating agent, restored the mercury inhibited enzyme activity and the degree of restoration was related to the concentration of the chelating agent.
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PMID:In vitro inhibition of digestive enzymes by heavy metals and their reversal by chelating agent: Part I. Mercuric chloride intoxication. 10 87

The effect of lead on alkaline phosphatase, lipase, aminotripeptidase and glycylglycine dipeptidase in the liver and digestive tract of Channa punctatus is investigated in vitro. Mercury inhibits the activities of all these enzymes and the degree of inhibition increased with the increase in the concentration of the metal. Addition of EDTA, a chelating agent, restored the mercury inhibited enzyme activity and the degree of restoration was related to the concentration of the chelating agent.
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PMID:In vitro inhibition of digestive enzymes by heavy metals and their reversal by chelating agent: Part II. Lead nitrate intoxication. 10 88

Alterations in the activities of alkaline phosphatase, acid phosphatase, glucose-6-phosphatase amylase, trypsin, pepsin, aminotripeptidase, glycylglycine dipeptidase and carnosinase due to exposure of Channa punctatus to a sublethal concentration (0.30 mg/L) of mercuric chloride by bath for 20 days have been studied in the different parts of the digestive system. Afall in the activities of the three phosphatases was recorded except for alkaline phosphatase which showed a slight elevation in activity in intestine and pyloric caeca. An increase in the activity of amylase and the two proteases was observed in all the portions of the digestive system. The three peptidases revealed a decrease in activity.
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PMID:The in vivo effect of mercuric chloride on some digestive enzymes of a fresh water teleost fish, Channa punctatus. 22 1

The effect of lead nitrate on the digestive system of a teleost fish, Channa punctatus has been studied after 125 days of exposure to a sublethal concentration (6.8 mg/liter). The results show that considerable degenerative changes are produced in the histological structure of liver, intestine, and pyloric caeca. In the liver, the damage is in the form of liver cord disarray, necrosis, inflammation of portal areas, hardening of connective tissue, shrinkage of nuclei, and septa formation around blood vessels. No fatty infiltration or glycogen depletion has been observed. Lipofuscin granules accumulated in the cytoplasm of hepatocytes. In the intestine and pyloric caeca flattening of villi at a number of places, inflammation, and necrosis are the most conspicuous changes. The activities of alkaline phosphatase and aminotripeptidase are inhibited in the liver. In stomach, alkaline phosphatase is inhibited but an elevation in amylase activity was noted. Acid phosphatase showed an increase in the intestine and pyloric caeca while aminotripeptidase and glycylglycine dipeptidase were inhibited.
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PMID:Histopathological and enzymological studies on the effects of chronic lead nitrate intoxication in the digestive system of a freshwater teleost, Channa punctatus. 40 Sep 74

Bone scintigraphy with 99mTc-MDP was performed on 8 patients with Paget's disease of bone. The radionuclide uptake by all the involved lesions was markedly increased, even in subclinical lesions without pain. Bone scintigraphy with 99mTc-phosphorous compounds were thought to be the most simple and sensitive technique to define the precise extent of the lesions, and to detect asymptomatic occult cases with Paget's disease. Possible A-V shunt was estimated in 3 cases by measuring the radioactivity over the lungs after the injection of 99mTc-MAA through a catheter into an artery which supplied the lesion. A-V shunt was calculated as 14.5%, 10.0% and 12.0%, respectively. An uptake study of 99mTc-MDP was attempted to quantify the effect of calcitonin treatment using a gamma camera combined with a computer. An "uptake ratio" was obtained for each lesion by dividing the count rate over the bone lesion by that over the control bone. Three cases of Paget's disease were treated with synthetic eel calcitonin analogue ([Asu1,7] E-CT) in a dose of 40 MRC unit per day. The effectiveness of CT therapy was evaluated by the X-ray film, the serum alkaline phosphatase activity (S-Al-P), the serum phosphate level, the serum calcium level and the "uptake ratio". No remarkable changes were obtained on bone X-ray films at one year after the initiation of the CT treatment in all cases. The S-Al-P levels did not show significant difference in the 2 cases, in which the S-Al-P levels were within the normal range before the treatment. In all cases, however, the "uptake ratio" of the diseased bone fell remarkably within the first three months and the rate of the fall was parallel to the decrease in the bone pain. It was considered that the "uptake ratio" on bone scintigraphy offered the most sensitive and reliable information in evaluating the CT treatment for Paget's disease.
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PMID:[Clinical feature and calcitonin therapy on Paget's disease of bone (author's transl)]. 57 27

1. The hydrolysis of glycyl-L-leucine, glycyl-L-tyrosine, tributyrin, sucrose, maltose, soluble starch and alpha- and beta-glycerophosphates by everted segments of rat intestine was estimated separately or in combination. 2. A comparative study showed significant interaction between different substrates which affected their digestion. 3. Two types of interaction were identified: products of hydrolysis (1) affected the hydrolysis of homologous substances, e.g. methionine and alanine inhibited glycyl-L-leucine hydrolysis, maltose reduced glucoamylase (alpha-1,4-glucan glucohydrolase; EC 3-2-1-3) activity (intracatenary interactions); (2) interfered with the hydrolysis of a different group of substances, e.g. tributyrin inhibited dipeptidase (glycyl-L-leucine hydrolase; EC 3-4-3-2) and alkaline phosphatase (EC 3-1-3-1), glycyl-L-leucine interfered with the activity of the latter enzyme (intercatenary interactions). 4. Mechanisms of interactions were suggested by the results of a comparison of the extent of inhibition or activation of two enzymes (glycyl-L-leucine hydrolase and alkaline phosphatase) in situ in everted intestinal segments or after solubilization with papain or Triton X-100, and different treatments known to affect allosteric sites of these enzymes. 5. Tributyrin and dipeptides were found to act on alkaline phosphatase as allosteric regulators. A discontinuity of the Arrhenius plot suggested the existence of different enzyme conformations which were re-arranged by tributyrin. 6. Substrate interactions in digestion were found in adult rat, cat, rabbit and hen. Substantial differences were found between classes (Aves and Mammalia), orders (rodents, lagomorphs and carnivores) and between age-groups within an animal strain (in this instance, for the rat). 7. These interactions are thought to be involved in the co-ordination of digestion with intestinal absorption and to regulate the time and site of subsequent hydrolysis.
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PMID:Substrate interactions on the intestinal mucosa: a concept for the regulation of intestinal digestion. 117 95

It was revealed in acute experiments that exposure to high temperature changed the invertase, dipeptidase, lipolytic and alkaline phosphatase activity of the small intestinal mucosa in rats. The direction of these changes and their degree differed in the thyroidectomized and sham-operated animals. It is suggested that the thyroid hormones took part in the reaction of the fermentative systems of the small intestine to the action of the thermal factor.
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PMID:[Influence of high temperature on the enzyme activity of the small intestine in thyroidectomized rats]. 122 73

The expression of cell-surface peptidases was examined in two human colon carcinoma cell lines, Caco-2 and HT-29. Enzymic assays revealed the presence of eight cell-surface peptidases on a Caco-2 cell line (passage number 82-88), namely aminopeptidase N, dipeptidyl peptidase IV, peptidyl dipeptidase A (angiotension-converting enzyme), aminopeptidase P, aminopeptidase W, endopeptidase-24.11, gamma-glutamyl transpeptidase and membrane dipeptidase. The presence of dipeptidyl peptidase IV and endopeptidase-24.11 was also confirmed immunochemically. After 15 days culture, the activities of aminopeptidase P, peptidyl dipeptidase A and alkaline phosphatase activities on Caco-2 cells reached a plateau, and that of membrane dipeptidase began to decline. In contrast, aminopeptidase N, dipeptidyl peptidase IV and endopeptidase-24.11 activities were still rising after 26 days in culture. Caco-2 cells of passage number 181-183 were found to lack endopeptidase-24.11, but maintained dipeptidyl peptidase IV expression. Two populations of HT-29 cells were surveyed. Both the standard, undifferentiated population and a differentiated population expressed only three peptidases: dipeptidyl peptidase IV, aminopeptidase W and carboxypeptidase M. In the differentiated HT-29 cells the activity of dipeptidyl peptidase IV after 14-21 days was beginning to plateau whereas aminopeptidase W activity was still rising and that of carboxypeptidase M had begun to decline. These differences in activity profiles observed among this group of cell-surface peptidases indicate that these cell lines, especially Caco-2, are useful models to study the regulation of their expression.
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PMID:A survey of membrane peptidases in two human colonic cell lines, Caco-2 and HT-29. 131 37

A series of enzymatic rate assays are described. The assays are based on coumarin derivatives that are fluorogenic substrates for the enzymes dipeptidase IV, aminopeptidase N, alkaline phosphatase, and gamma-glutamyltransferase. These simple assays are rapid and offer improved sensitivity over established colorimetric methods. The substrates have apparent affinities for the enzymes of 5-250 microM. L-Glutamic acid gamma-(7-amido-4-methylcoumarin) is characterized as a substrate of gamma-glutamyltransferase on the basis of inhibition of enzymatic cleavage when the glycylglycine acceptor molecule is omitted and inhibition of the enzymatic reaction by addition of glycine. Assay conditions for the four enzymes are established such that less than 0.6% of the substrate is consumed, fluorescence is proportional to enzymatic product, and results may be directly compared to established colorimetric assays. Intestinal epithelial cells are used both to establish appropriate assay conditions and to demonstrate the utility of the assays.
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PMID:Assay of apical membrane enzymes based on fluorogenic substrates. 135 46

A case of adult onset hypophosphatemic vitamin D resistant osteomalacia is described. A 40-year-old female who complained of thorax and lumbar pain and gait disturbance was admitted to our hospital on 7 November, 1988. The patient had hypophosphatemia with normal plasma calcium, parathyroid hormone and 25-hydroxy vitamin D3 concentrations, but had decreased tubular reabsorption of phosphate and decreased plasma 1, 25-dihydroxy vitamin D3 concentrations. The iliac crest bone biopsy showed osteomalacic changes. The 99mTc-MDP bone scintigram showed evidence of increased bone turnover with raised plasma alkaline phosphatase concentrations. After treatment with oral 1 alpha-hydroxy vitamin D3 (3-6 micrograms/day) and intravenous or oral phosphate supplement (0.47-1.74g/day), the subjective and clinical findings improved.
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PMID:[A case of adult onset hypophosphatemic vitamin D resistant osteomalacia]. 144 82


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