Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:1.6.5.2 (NQO1)
 6,196 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Of a total of 1,420 odontogenic cysts, 52 (3.3%) were diagnosed as odontogenic keratocysts. Clinical and histological findings in these 52 cysts are reported. Frozen sections of 26 of the keratocysts were incubated to show the following enzyme activities: NADH2- and NADPH2-diaphorase, glucose-6-phosphate dehydrogenase, glutamate dehydrogenase, acid phosphatase, leucine aminopeptidase and ATPase. Furthermore, keratinization was studied with the rhodamine B method and lipids with the oil red O, the OTAN and the acid hematein methods. Sections from epidermis, oral mucosa, radicular cysts, residual cysts and follicular cysts served as reference material. The oxidative enzymes showed strong activity in the keratocyst epithelium which contrasted with weak activity in the reference cysts. Acid phosphatase activity was weak in all epithelia except that in keratocysts, which displayed a marked activity. In the fibrous capsule of the keratocyst a high activity of leucine aminopeptidase was recorded. This high activity contrasted with a weak activity in the reference material. The significance of the histochemical results in relation to the aggressive behavior of the keratocyst is discussed.
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PMID:Odontogenic keratocysts: a clinical and histological study with special reference to enzyme histochemistry. 14 97

A histological and histochemical study of ingested food material, energy stores and enzymes in the monogenean Pseudodactylogyrus anguillae, parasitizing the gills of the European eel (Anguilla anguilla) is presented. It was found that mucus, epithelial cells and blood from the gills were ingested. Glycogen deposits were small and primarily located in the parenchyma and to a minor extent in the vitellariae. Numerous globules of neutral lipids were found in the vitellariae. A marked esterase activity was found in the gut and a less marked activity in the vitellariae. Acid phosphatase activity was found throughout the body whereas alkaline phosphatase and leucine-amino-peptidase were not detected. Marked activity of succinate dehydrogenase and NADH-diaphorase was found in all cells, indicating a predominantly aerobic metabolism in this monogenean.
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PMID:The nutrition of the gill parasitic monogenean Pseudodactylogyrus anguillae. 342 77

The effects of irradiation on various tissues have been studied extensively. Nonetheless, the metabolism in growing bones has not been evaluated in a systematic way after moderate doses of irradiation. It was found that scattered radiation, that reaches the oral region during radiotherapy of malignancies outside the oral region, causes absorbed doses within the range of 0.2-20 Gy, while absorbed doses from radiography in orthodontics were only 30-40 mGy. Bone formation in the metaphyseal area of rat tibia in vivo after irradiation with 0.5-8 Gy was determined by a tetracycline labelling method. Five and 8 Gy induced a significant growth retardation. This was detectable already after 36 hours and was maximal 7-14 days after irradiation. Between 14 and 30 days following irradiation growth was normalized. Alkaline phosphatase (ALP) activity in bone was evaluated biochemically and decreased one day after irradiation with 0.5-8 Gy. This was followed by a gradual increase in ALP activity and a return to normal values 30 days after irradiation. Histochemical studies of the rat tibias included evaluation of ALP, acid phosphatase, NADH2-diaphorase and Glucose-6 phosphate dehydrogenase. A decrease in ALP activity one day after irradiation was observed with 5, 8, and 10 Gy. Acid phosphatase and the two oxidative enzymes were increased in activity during the entire 7-day experimental period, reflecting an altered metabolism. Normal activities of all the studied enzymes were observed 30 days after irradiation. Results from suture area and synchondrosis area as evaluated by histochemistry and a cephalometric radiographic method showed that early transient metabolic changes occurred in the craniofacial growth sites after irradiation with 5 and 8 Gy. The morphological changes observed in anatomical regions within the irradiated field (neurocranium) persisted in contrast to the changes in the viscerocranium that were normalized at the end of the experimental period. An in vitro system was used to examine the effects of irradiation on certain aspects of bone growth. Mice calvaria were irradiated in vitro with 2 or 10 Gy. A different response in suture and bone was found 3 hours to 4 days after irradiation. Bone was affected by 2 Gy, but not the suture. Thus, the suture seems to be an area with more radioresistant fibroblast-like cells than the cortical bone, which indicates a difference in radiosensitivity of the cells in these two growth sites. The conclusions from the present thesis are that irradiation with 2-10 Gy of bone both in organ culture and in experimental animals induces metabolic and morphologic changes which were detected early and were transient.
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PMID:Effects of irradiation on growing bones. 346 72

Ultrastructural, morphometric and metabolic characteristics were studied in thyrocytes of 96 mice treated with immunosuppressing and cytostatic drug cyclophosphamide (CY), injected intraperitoneally every other day either for a short time (up to 6 days) in high doses (400 mg/kg) or for a long time (up to 70 days) in moderate doses (40 mg/kg). High doses of CY caused the reduction in thyrocyte height, NADH-diaphorase activity in their cytoplasm and protein content in the follicular colloid as compared to these parameters in a control group. The cisterns of rough endoplasmic reticulum (RER) underwent swelling and deformation with the loss of electron density of their contents. This was accompanied by mitochondrial swelling with matrix clarification and disorganization of cristae and an increase in the amount of cytoplasmic lipid droplets. Following long-term administration of CY in moderate doses the thyrocyte height exceeded that one in control group, while the NADH-diaphorase activity changed insignificantly and protein concentration in colloid increased. In the majority of thyrocytes the nucleus and major organelles retained their normal structure, while in some cells the cisterns of RER appeared dilated. Acid phosphatase activity was unchanged in both experimental groups. Thus, despite the approximately equivalent total CY dose in experimental groups, its damaging effect on thyrocytes was expressed much less in animals receiving the moderate doses of CY, that, probably, could be explained by the lack of CY cumulative effect and high rate of its metabolic degradation and clearance.
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PMID:[Ultrastructural and metabolic characteristics of the thyrocytes exposed to cyclophosphane]. 1508 84