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 dorsal surface of the rabbit ear was found to be a suitable place for the production of long-lasting lymphoedema. Its major tissues (skin and sub cutaneous) are those to which secondary lymphoedema is confined in clinical situations. After 32 weeks of partial lymphatic blockade total tissue activity levels of neutral proteinase and beta-glucuronidase were depressed while alkaline phosphatase was elevated. Subsequent complete lymphatic blockade for a further 5 weeks resulted in severe fibrosis of the s.c. tissues. The total tissue activity levels of 3 characteristic lysosomal macrophage hydrolases--acid protease, beta-glucuronidase and acid phosphatase--were significantly increased. There were strong correlations between the activity levels of these enzymes and the extent of fibrosis, increased fibrosis being characterized by higher activity levels. This, together with other evidence, suggested--as fibrosis became more severe--the total number of macrophages increased, but a high proportion of these were non-stimulated. Since these cells (when stimulated) are normally responsible for the lysis of collagen and removal of fibrotic tissue the impairment of their function as occurs in chronic lymphoedema results in further fibrosis and the continuation of the vicious circle.
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PMID:Lymphoedema of the rabbit ear following partial and complete lymphatic blockade; its effects on fibrotic development, enzyme types and their activity levels. 67 48

The effects of a mild zinc-deficient state in humans were studied. Four male volunteers received restricted zinc intake for several weeks under strict metabolic conditions. As a result of dietary zinc restriction, a decrease in zinc concentration of plasma, erythrocytes, leukocytes, and urine was observed. Changes in the activities of zinc-dependent enzymes in the plasma such as alkaline phosphatase and ribonuclease were also related to the dietary zinc status. An adverse effect of zinc restriction on total protein, total collagen, ribonucleic acid, and the activity of deoxythymidine kinase (a zinc-dependent enzyme) in the sponge connective tissue of the two volunteers in whom this test was done was noted. During the zinc restriction period, the ammonia level in the plasma was elevated. Weight loss occurred in all subjects as a result of dietary zinc restriction. Inasmuch as the zinc-deficient state was mild, this study provides a basis for developing diagnostic criteria for zinc deficiency in humans.
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PMID:Experimental zinc deficiency in humans. 69 27

Tooth germs of killifish were examined by both ultrastructural and cytochemical methods. The ultrastructure of the dentin in the early calcification stage of its development resembled that of mammals. Numerous extracellular membrane-bounded vesicles, matrix vesicles, were seen in the predentinal space, especially abundantly in the basal portion of the tooth germ. They were more numerous and more uniform in appearance than in any other higher vertebrates. Where calcification was going to start, slightly identifiable needles of apatite crystals were found in the vesicular structures. Crystals increase in number filling up the vesicles and then ther surroundings, finally to form many calcified spherules. Where calcification was more extensive, the matrix vesicles were no longer visible having been buried calcified among spherules. Contrary, to popular belief, there was no relationship seen between collagen fibrils and the initial deposits of minerals, that is, collagen fibrils did not seem to work as the initial site of calcification. Instead, matrix vesicles and plasma membranes of odontoblasts likely were involved in calcification as they both showed alkaline phosphatase activity. The ultrastructural and cytochemical findings from this study thus indicated that calcification of the killifish tooth germs was initiated not in the enamel, but in their dentin by the matrix vesicles which were liberated into the dentin matrix from odontoblasts mainly by way of fragmentation of cell processes.
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PMID:Ultrastructural and cytochemical studies on the matrix vesicle calcification in the teeth of the killifish, Oryzias latipes. 71 85

Two siblings displaying macrocrania and multiple skeletal deformities, as well as cardiomegaly, had high levels of serum alkaline phosphatase and markedly increased urinary hydroxyproline excretion. The radiological findings of chronic familial hyperphosphatasemia, which are typical of a rare bone-remodeling disease, are presented. Scintigraphy disclosed intense uptake of the radionuclide by the skeletons of both patients. This finding, considered to be related to abnormal collagen metabolism, can be used in the diagnosis and assessment of skeletal involvement in such patients.
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PMID:Chronic familial hyperphosphatasemia. 72 42

Changes of alkaline phosphatase activity in the process of healing liver injuries of rats on which partial hepatectomy was performed were the subject of our researches. Reaction on alkaline phosphatase was performed on cryostat sections according to the method of Gomori-Takamatsu. It has been found that granulated precipitate of cobalt sulphide was localized in the cytoplasm of granulocytes, macrophages and fibroblasts. A diffusive reaction comprized clusters of newly created collagen fibres. In early stages in the centres of necrosis, the activity of alkaline phosphatase increased, in later periods a lack of the activity was observed. Steatosis of liver tissue does not correlate with the intensity of the reaction. Lack of alkaline phosphatase activity is characteristic for old cicatrices. The authors discuss the effects of the histogenetical process during healing of liver injury on the results of the histoenzymatic reactions. The authors suggest that alkaline phosphatase is involved in the mechanism of re-building collagen fibres. It is stressed in the conclusion that the localization and intensity of alkaline phosphatase in the area of healing liver lesions are variable depending on the period of healing wound of the liver and the influence of other complications.
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PMID:Activity of alkaline phosphatase in the healing rat liver after hepatectomy. 74 40

The activity of proline imino-peptidase (EC 3.4.1.4) may provide a measure of collagen degradation, and a method for its estimation in human serum is described. The mean value of this enzyme activity in 48 normal adults of 4.7 mU/l (S.D. 0.9) did not change with sex, age or dietary collagen. In 8 patients with liver disease associated with elevated levels of plasma alkaline phosphatase activity the mean value was normal (4.5 mU/l, S.D. 1.5). However, in 25 patients with untreated Paget's disease of bone, values were significantly increased (mean 7.4 mU/l; S.D. 2.8; p less than 0.001) and were positively correlated with plasma alkaline phosphatase activity (r = 0.75; p less than 0.001) and with urine total hydroxyproline excretion (r = 0.68; p less than 0.001). In patients given disodium ethane-1-hydroxy-1,1-diphosphonate for 3--6 months, serum proline imino-peptidase activity decreased to normal values.
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PMID:Serum proline imino-peptidase activity in normal adult subjects and in patients with Paget's disease of bone. 82 68

Fibronectin, a plasma protein immunologically identical with a major surface protein of normal fibroblasts, was found to bind to collagen and gelatin. A solid phase enzyme immunoassay was used for the binding tests. Collagen, gelatin or various control proteins were adsorbed to a plastic surface. Binding of fibronectin was detected using purified fibronectin antibodies conjugated to alkaline phosphatase. Circulating fibronectin and fibronectin obtained from fibroblast cultures both showed specific binding to collagen and gelatin. Preparative affinity chromatography of plasma on gelatin coupled to Sepharose gave electrophoretically and immunologically pure fibronectin in high yields. Malignantly transformed fibroblasts lack surface fibronectin. Our findings suggest the possibility that this results in a lack of anchorage to the surrounding intercellular matrix, which could contribute to the malignant growth behavior.
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PMID:Binding of soluble form of fibroblast surface protein, fibronectin, to collagen. 90 79

Ultrastructural and cytochemical studies on the remodelling of the rat tracheal cartilage have been carried out. The thickness of the tracheal cartilage was constant, during the observation periods (1 to 54 days after birth). The external perichondrium of the tracheal cartilage consisted of active fibroblasts and intercellular fibrils. The inner part of this perichondrium was a chondrogenic layer, where appositional growth was taking place. On the other hand, the internal perichondrium contained fibroblast-like cells, which were nearly twice as large as the external perichondrial fibroblasts in size and were arranged in three or four layers. The cells had well developed organella and large vacuoles which contained numerous fragments of fibrils and/or glycosaminoglycan. Many cytoplasmic processes protruded to the cartilage matrix, where the intercellular fibrils were particularly irregular in arrangement. Some vacuoles included collagen fibrils. Based on an intense acid phosphatase activity in these vacuoles and other findings, the fibrils were thought to be phagocytosed collagen of the cartilage matrix. An extensive alkaline phosphatase activity was demonstrated on the plasma membrane of fibroblasts and chondroblasts in the external perichondrium. The present investigation revealed distinct functional difference between the external and internal perichondrium of the tracheal cartilage. It is resorbed at the internal perichondrium, while it appositionally grows at the external perichondrium. The fibroblast-like cells of the internal perichondrium play an essential role in resorption of the matrix in cartilage remodelling.
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PMID:Ultrastructural and cytochemical studies on the remodelling of the tracheal cartilage. 96 11

In 8 patients with lymphadenosis benigna cutis (LABC) cytochemical and in 2 of them immunocytological studies have been performed. 1) In patients with LABC we find ectopic organoid proliferations of "lymphfollicle"-like structures within the dermis which predominately consist of small lymphocytes and large reticulum cells. Immunocytological differentiation of the lymphocytes leads to the characterization of B- and T-lymphocytes in a ration 2:1. 2) Large reticulum cells represent a peculiarly remarkable cell class in infiltrates of LABC. Because of their typical arrangement disseminated within the lymphocytic infiltrate they have been designated as "starry sky" cells. Cytochemically they are characterized by an unusual high content of nonspecific esterases and acid phosphatase, most of them show phagocytized basophilic bodies. Because of their shape, arrangement and enzymcytochemical behaviour these cells can be referred to as typical for the LABC disease. 3) Monocytes cannot be found within the "lymphfollicles". Mast cells and connective tissue cells are rarely observed. Polymorphonuclear granulocytes can be demonstrated in great numbers in any part of the involved cutis when there is an insect bite in history. 4) As a reaction of the ectopic proliferation of lymphoreticular tissue within the dermis there is an activation of the surrounding connective tissue with an increase of the alkaline phosphatase activity within these cells, new formation of collagen fibres and strong proliferation of alkaline phosphatase positive capillaries. 5) Etiopathologically it is stressed, that in LABC for example an insect bite induces stimulation of hematopoietic potentialities of undifferentiated mesenchymal germ centres within the cutis takes place, leading to the development of ectopic of "lymphfollicle" like structures.
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PMID:[Lymphoreticular proliferations in the skin. Cytochemical and immunocytological studies in lymphadenosis benigna cutis]. 107 8

The case history, clinical course and laboratory findings in a 66-year-old woman with fibrogenesis imperfecta ossium are reported, the sixth case in the literature. The condition is characterized clinically by intractable skeletal pain and progressive immobility. Though serum alkaline phosphatase has been raised in all patients, there are no specific haematological or biochemical findings. The radiological features of coarse and dense trabecular pattern with symmetrical and diffuse involvement of all bones without expansion or change of shape, together with periosteal reactions and soft tissue calcification are characteristic. The macroscopic appearance of bone shows large areas of opaque white and brittle trabeculae. The histological findings mimic those of osteomalacia unless examined under polarized light which shows the loss of normal birefringence. On electron microscopy the normal lamellar pattern made up of orientated collagen fibrils all about 80 nm diameter is replaced by a random tangled pattern of much thinner irregularly curved fibrils, some as thin as 5nm. The condition appears to be acquired, leading to erosion of the normal skeleton and replacement with an abnormal fibre deficient matrix. There is no definitive therapy at present.
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PMID:Fibrogenesis imperfecta ossium. 108 5


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