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:3.1.3.9 (glucose-6-phosphatase)
3,081 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effect of Fusarium sporotrichiella v. sporotrichioides mycotoxin (sporofusarin) on the total and non-sedimentary supernatant activity of 13 marker-enzymes of subcellular particles (2 mitochondrial enzymes-cytochrome oxidase and malate dehydrogenase; 8 lysosomal enzymes -- acid phosphatase, acid RNAase, acid DNAase, arylsulphatases A and B, beta-N-acetylglucosaminidase, beta-glucuronidase, beta-galactosidase and beta-glucosidase; 2 microsomal enzymes -- glucose-6-phosphatase and acetylesterase; plasma membrane enzyme -- alkaline phosphatase) of the rat liver, kidney, spleen and bone-marrow was studied in in vivo experiments. The latter demonstrated that sporofusarin effects were characterized by a significant organ and organella specificity, viz. the toxin caused a sharply increased activity, mainly of lysosomes enzymes and labilization of the lysosomal membranes, primarily in the spleen and the bone-marrow. A conclusion is drawn that the discovered selective destructive action of sporofusarin on the lysosomes may be regarded as a new phenomenon that, possibly is directly related to the characterization of the mechanism responsible for a specific effect produced by sporofusarin.
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PMID:[Lysosomal component in the mechanism of the toxic effect of sporofusarin]. 94 27

The protein content and activity of enzymatic markers of cell organelles: succinate dehydrogenase, glucose-6-phosphatase, uricase, acid phosphatase, 5'-nucleotidase and alkaline phosphatase were assayed in the homogenate and the supernatant (after two-hour centrifugation at 140,000 X g) of the liver and intestinal epithelium in rabbits irradiated with a single dose of 550 rads of gamma rays. The determinations were carried out on 1,3,6,9,15 and 30 days after irradiation for experimental and control animals. After gamma irradiation the following alterations were found: 1) increase in protein content (marked between 3-6 days), 2) remarkable rise of alkaline phosphatase activity (during the entire period of study), 3) elevation of 5'-nucleotidase activity (only in the intestinal epithelium), 4) marked reduction of succinate dehydrogenase and uricase activity (on the first day of study), 5) moderate decrease of glucose-6-phosphatase activity (mainly on the third day). Apart from a slight decline in the activity of acid phosphatase in the homogenate of intestinal epithelium, on the third day there practically were no changes in the activity of this enzyme either in the supernatant of intestinal epithelium or in the liver tissue.
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PMID:Effect of gamma radiation on the enzymatic activity of cell organelles of liver and epithelium of small intestine in rabbits. 123 88

Ultrastructural changes and enzyme activities in the cell organelles of rabbits were studied within 1, 3, 6, 9, 15 and 30 days of the irradiation with 550 rads of gamma-radiation. Between the 1st and 3rd day after irradiation there was a fall in the succinate dehydrogenase activity in the swollen and frequently tigroidal mitochondria whose number distinctly diminished. By the 15th day these changes disappeared. In the hyaloplasm there was weakening of the reaction for lactate dehydrogenase after 1 day, and an increase in number of polysomes, glycogen granules and smooth vesicles after 3-9 days after irradiation. The glucose-6-phosphatase activity was unchanged and so was the shape of the Golgi apparatus. The activity of lysosomal enzymes and the number of lysosomes in the experimental groups was approximately normal. By the 6th day the activity of alkaline phosphatase in the striated border was lowered, subsequently normal. On the whole, the intensity of postradiation changes in the intestinal mucosal epithelium is correlated with the rhythm of proliferation and shedding of epithelial cells, although some signs of injury persist for longer time periods.
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PMID:Radiation-induced histochemical and ultrastructural changes in the enterocytes in the rabbit. 127 27

Male outbred Sprague-Dawley rats were fed a choline-deficient diet containing 0.10% DL-ethionine (CDE) for 4, 6, 10, 14 or 22 weeks followed by a standard diet for up to 59 weeks. Liver sections were histochemically analyzed for the following parameters: basophilia, glycogen content and the activities of glycogen synthase (SYN), glycogen phosphorylase (PHO), glucose-6-phosphatase (G6PASE), glucose-6-phosphate dehydrogenase (G6PDH), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), glycerin-3-phosphate dehydrogenase (G3PDH), 'malic enzyme' (MDH), alkaline phosphatase (ALKPASE) and gamma-glutamyltranspeptidase (GGT). The stop experiments revealed that many of the oval cells proliferating during the first 4-6 weeks may undergo necrotic changes and disappear with time, whereas cholangiofibroses appearing in animals fed CDE for at least 10 weeks are persistent lesions. The sequence of lesions seen in this study, leading from persistent oval cells through cholangiofibroses to cholangiofibromas, strongly suggests that the oval cells are the precursor cells of cholangiocellular tumors. The proliferating oval cells and the hepatic foci consisting of clear and acidophilic or mixed cell populations were always spatially separated and no transitions between oval and parenchymal cells were observed. These results argue against a precursor-product relationship between oval and parenchymal cells. Both proliferating and persistent oval cells, cholangiofibroses and cholangiofibromas showed a strong staining for G6PDH, GAPDH, G3PDH, MDH, ALKPASE and GGT; low PHO, SYN and G6PASE activities were also detected in these lesions. Persistent glycogen-storage foci, which developed in all rats fed CDE for 4-14 weeks followed by a normal lab chow for over a year, had increased PHO, G6PDH, MDH, ALKPASE and GGT activities, while SYN, GAPDH and G3PDH activities remained unaltered and G6PASE activity decreased. Mixed cell foci appearing in animals fed CDE for 22 weeks followed by a normal lab chow for 59 weeks had strongly increased G6PDH, GAPDH, G3PDH, MDH, ALKPASE and GGT activities as well as decreased G6PASE activity. These results indicate that the characteristic metabolic pattern of preneoplastic hepatic foci is independent of the further administration of the carcinogenic diet. The shift from glycogen metabolism to glycolysis and the pentose phosphate pathway occurring during the later stages of CDE-induced hepatocarcinogenesis is an autogenous process apparently directing the disturbed carbohydrate metabolism towards alternative metabolic pathways. A similar metabolic shift also seems to take place during cholangiocarcinogenesis.
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PMID:Persistence of the cholangiocellular and hepatocellular lesions observed in rats fed a choline-deficient/DL-ethionine-supplemented diet. 131 Sep 7

Twenty-four pigs from four litters weaned at 21 d of age (6.6 kg of BW) were used to evaluate the influence of 250 ppm of dietary Cu on intestinal mucosa glucose-6-phosphatase (GP), alkaline phosphatase (AP), and adenosine triphosphatase (ATPase) activity; mucosal morphology; and the turnover rate of the intestinal mucosa throughout the gastrointestinal tract. Pigs were allotted into four pens of six pigs each based on sex, litter, and weight. Pens were then assigned to one of two treatments: 1) corn-soybean meal-whey diet with no antimicrobials (CO), or 2) CO + 250 ppm of Cu. Pigs were fed twice daily an amount approximately equal to ad libitum intake for 14 d. On d 14, pigs were injected i.p. with [3H]thymidine (50 microCi/kg of BW) 10 h after the morning meal. One pig from each pen was euthanatized at 1, 6, 12, 20, 32, and 44 h postinjection, and intestinal tissue was collected from the duodenum, two jejunum sites (upper and lower), ileum, cecum, and colon. The activity of GP and AP in the lower jejunum tended to decrease in pigs fed Cu (P less than .11, P less than .08, respectively). The ATPase activity was not affected by treatment (P greater than .10). Crypt death, villus height, or epithelial cell size (P greater than .10) were not affected by feeding Cu. Migration rate of epithelial cells up the villus was also not affected by treatment (P greater than .10).(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Effect of dietary copper on intestinal mucosa enzyme activity, morphology, and turnover rates in weanling pigs. 132 10

The correlation of 5-fluorouracil (5-FU) distribution and its toxicity had been investigated in Albino rats. H3-5-FU was administrated either by intraperitoneal (I.P.) or anal submucosal (A.sm.) route. 5-FU was promptly distributed in different organs with marked accumulation in the pelvic area after A.sm. and in liver and kidney after I.P. administration. Acute toxicity (L.D. 50) was stronger after I.P. (63 mg/kg compared with 80 mg/kg after A.sm.). Side effects expressed in elevation of transaminase and alkaline phosphatase and increase in liver tissue glucose-6-phosphatase and total white blood count were much pronounced after I.P. administration. The results suggest the possibility of using A.sm. route for administration.
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PMID:Distribution and toxicity of 5-fluorouracil after intraperitoneal and anal submucosal administration. 132 94

D-Galactosamine (800 mg/kg, intraperitoneally) caused significant decrease in the activities of 5'-nucleotidase, glucose-6-phosphatase and cytochrome P450 and increase in activities of gamma-glutamyl transpeptidase, succinate dehydrogenase, acid phosphatase and acid ribonuclease in liver after 24 hr. The levels of RNA, protein and glycogen decreased while total lipids, phospholipids, cholesterol and lipid peroxides increased. It also increased the serum levels of transaminases, alkaline phosphatase and bilirubin while protein concentration decreased significantly. Oral administration of Picroliv (12 mg/kg/day for 7 days), a standardised iridoid glycoside fraction of Picrorhiza kurroa, significantly prevented the biochemical changes in liver and serum of galactosamine-toxicated rats. Kutkoside (12 mg/kg/day for 7 days) also protected against changes in most of the hepatic and serum constituents studied. Another iridoid glycoside from Picroliv, Picroside I, at the same dose level could only prevent toxicant-induced changes in acid phosphatase, phospholipids and lipid peroxides in liver and alkaline phosphatase in serum. Mixture of Picroside I and Kutkoside in the ratio of 1:1.5 at 12 mg/kg dose elicited lesser response than Picroliv.
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PMID:Picroliv and its components kutkoside and picroside I protect liver against galactosamine-induced damage in rats. 133 78

In vitro addition of the drugs tetramisole (TMS) and levamisole (LMS) caused an inhibition of the specific activities of acid phosphatase and Mg(++)-dependent adenosine triphosphatase. The inhibition was non-competitive in nature. No significant inhibition was caused by TMS in the activity of glucose-6-phosphatase, but LMS inhibited the enzyme in a non-competitive manner. The activity of alkaline phosphatase was, however, increased in the presence of both TMS and LMS.
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PMID:Effect of anthelmintics on phosphatases in Ascaridia galli. 133 58

Renal clear cell tubules and clear/acidophilic cell tumors were induced in male Sprague-Dawley rats by 7 weeks oral administration (stop model) of N-nitrosomorpholine (NNM) at a concentration of 12 mg/100 ml in the drinking water. Twelve, 23 and 34 weeks after withdrawal of NNM serial cryostat sections of the kidneys were histochemically analyzed for the following parameters: glucose transporter proteins (GLUT1, GLUT2), glycogen content and the activities of glycogen synthase (SYN), glycogen phosphorylase (PHO), glucose-6-phosphatase (G6Pase), glucose-6-phosphate dehydrogenase (G6PDH), hexokinase (HK), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), pyruvate kinase (PK), succinate dehydrogenase (SDH), malate dehydrogenase (MDH), alkaline phosphatase (ALP), acid phosphatase (ACP) and gamma-glutamyltransferase (GGT). Clear cell (glycogenotic) tubules first appeared at 23 weeks, and clear/acidophilic cell tumors at 34 weeks after withdrawal of the carcinogen. G6Pase, ALP, GGT and GLUT2 were absent in clear cell tubules, clear/acidophilic cell tubules, and clear/acidophilic cell tumors indicating a sequential origin of all these types of lesions from the collecting duct system, in line with previous morphological findings. In comparison to the collecting duct epithelium, glycogenotic tubules demonstrated an increased activity of PHO and reduced activities of glycolytic and mitochondrial enzymes, which were accompanied by a strongly reduced expression of GLUT1. Moderately increased activities of glycolytic and mitochondrial enzymes were observed in the clear cells of clear/acidophilic cell tubules and tumors compared with those in glycogenotic tubules. They had slightly increased activities of the glycolytic enzymes GAPDH and PK compared with normal collecting duct epithelium, while most of them were nearly lacking in GLUT1. Our findings suggest that glycogen storage is not due to an increased uptake of glucose from the blood, but results from a disturbance in intracellular flux of metabolites. The development of clear cell tubules from the normal collecting duct epithelium is accompanied by a markedly decreased expression of GLUT1 along with a reduction in glycolytic and mitochondrial enzymes. This reduction of enzyme activities is replaced by an increase in enzyme activities in clear/acidophilic cell tumors indicating a fundamental shift in carbohydrate metabolism during progression from preneoplastic to neoplastic lesions.
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PMID:Sequential changes in glycogen content, expression of glucose transporters and enzymic patterns during development of clear/acidophilic cell tumors in rat kidney. 147 41

S-allyl cysteine sulphoxide (SACS), a sulphur containing amino acid of garlic which is the precursor of allicin and garlic oil, has been found to show significant antidiabetic effects in alloxan diabetic rats. Administration of it at a dose of 200 mg/kg body weight decreased significantly the concentration of serum lipids, blood glucose and activities of serum enzymes like alkaline phosphatase, acid phosphatase and lactate dehydrogenase and liver glucose-6-phosphatase. It increased significantly liver and intestinal HMG CoA reductase activity and liver hexokinase activity.
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PMID:Antidiabetic effects of S-allyl cysteine sulphoxide isolated from garlic Allium sativum Linn. 150 36


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