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Query: UMLS:C0019158 (hepatitis)
 30,205 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The development of hepatitis, induced in 48 rats by the administration of galactosamine (GalN) in varying doses, was studied with the use of substrate and enzyme histochemical techniques. The so-called atypical glycogen, which is at first highly resistant to diastase, was shown to be digestible after deamination. The increasing accumulation of atypical glycogen during the course of GalN-hepatitis conceals the loss of normal glycogen when the PAS-reaction is used. Nevertheless glycogenolysis could also be demonstrated by the increasing activity of phosphorylase. The acid phosphatase activity was progressively diminished, which was interpreted as signifying early lysosomal damage. G6Pase activity remained nearly constant but SDH showed a decrease in activity after 12 h. These histochemical results are considered to provide deeper insight into the pathological mechanism of GalN-hepatitis.
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PMID:Histochemical studies on carbohydrate metabolism in rat liver after galactosamine administration. 3 60

Role of lipid peroxidation on lysosomal instability in liver tissue was investiaged in an experimental model of D-galactosamine hepatitis in rats fed on vitamin E (V.E) deficient diet. Administration of D-galactisamine to V.E deficient rats resulted in a sudden increase of serum glutamic oxaloacetic transaminase (sGOT), glutamic pyruvic transaminase (sGPT), lipid peroxide value, as well as beta-glucuronidase and acid phosphatase activity examined as markers of lysosomal enzymes, when compared with control rats fed on V.E supplemented diet. Lipid peroxide in the liver tissue also showed significant increase in V.E deficient rats. In contrast, beta-glucuronidase and acid phosphatase in the liver tissue were found to decrease in V.E deficient rats by the administration of D-galactosamine, indicating that the enzymes in the lysosome were entirely released outside the liver cells as a result of cell destruction. It is concluded that the increase of lipid peroxide causes the instability of lysosomal membranes and releases various kinds of hydrolytic enzymes to lead further to cell damage. V.E might act on inhibiting lipid peroxidation to stabilize lysosomal membranes.
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PMID:Lipid peroxidation and lysosomal enzymes in D-galactosamine hepatitis and its protection by vitamin E. 44 84

Stokke has described a lysosomal cholesterol ester hydrolase (CEH) in human liver. To clarify the significance of this enzyme, we first modified Stokke's assay to enable CEH determination in hepatic needle biopsies. Studies established optimal pH of 4.6--5.2 and linearity of hydrolysis for at least 12 hours, using homogenates containing about 2 mg liver and radiolabeled cholesterol oleate as substrate. The assay was then applied to patients undergoing percutaneous needle biopsy. Hepatic CEH activity in alcoholic liver disease, obstructive jaundice and a variety of other hepatic disorders was not significantly different from that in histologically normal livers. In patients with acute hepatitis, however, mean CEH activity was more than 3-fold increased (P less than 0.01). Values paralleled SGOT levels, returned to normal as hepatitis resolved, and were unrelated to serum cholesterol levels or to lecithin:cholesterol acyltransferase activity. In contrast to CEH, activity of acid phosphatase, a standard lysosomal marker enzyme, was the same in hepatitic as in normal livers. We conclude that CEH can be assayed in needle biopsies of human liver, that its activity increases in acute hepatitis, and that this is probably not simply due to a nonspecific general increase in lysosmal enzymes.
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PMID:Studies on human hepatic cholesterol ester hydrolase in liver disease. 74 52

In 24 hours after a single administration of melleril (30 mg/kg) an elevated injuriousness of "heavy" and "light" liver lysosomes of rats subjected to "in vitro" treatment with a pH 5.0 solution at 37 degrees was recorded. Introduction of melleril to rats with toxic CCl4-induced hepatitis (CCl4 dosage of 0.15 ml per 100 g body weight) depresses free activity of acid phosphatase, this fall, however, failing to reach the corresponding values in intact animals. An elevated injuriousness of "heavy" and "light" lysosomas undergoing treatment at pH 5.0 and 37degrees, revealed in all variants of the tests, is related to activation of lysosomal phospholipases with subsequent liberation of surfactant lipids and volumetric changes of the particles.
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PMID:[Effect of mellaril on the liver lysosomes of rats with acute toxic hepatitis]. 102 73

Two groups of experimental animals, each consisting of 12 rabbits, were subjected to local fractional irradiation with cobalt 60. Group I received the total dose of 2580 R during 13 days, group II - 5100 R during 24 days. The effects of irradiation were estimated on the strength of histological examination of the liver immediately and after 7, 15, 30, 60 and 90 days after the last exposition. The histological sections were stained with haematoxylin and eosin, and colour reactions were performed for argentaffine and collagen fibres and for glycogen, neutral fats, alkaline and acid phosphatase, ATP-ase, glycose-6-phosphatase, non-specific esterase and succinic acid dehydrogenase. It was found that the dose of 2580 R is safe for the liver. The effects of irradiation were slight and limited to weak catabolic disturbances in the form of mild steatosis of the liver and of a transient and short-lived fall of glycogen and rise of hydrolytic enzymes. More pronounced and intense changes were observed in the other group of animals. During the early period, the changes were of a retrograde character and were typical of the acute post-irradiation effect. There was necrosis of the walls of the blood vessels, of the epithelium of the bile ducts and of the liver cells, accompanied by a rise in the hydrolytic enzymes and by a considerable fall of the level of glycogen and succinic acid dehydrogenase. During the late period (30-90 days), changes typical of the so-called post-irradiation hepatitis were found histologically.
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PMID:[Pathomorphological and histochemical changes in the liver of rabbits following fractional irradiation with Co-60]. 118 53

Changes occurring in the lysosome population were assessed by the results of studies of intracellular distribution of the marker lysosome enzymes--acid phosphatase and acid RNAase. An acute (pure CCl4-0.15 ml per 100 g of weight into the stomach) and chronic (inhalation poisoning after Rabinovici and Wiener) toxic hepatitis was accompanied by an increase in the specific activity of the enzymes in the fraction of heavy mitochondria, this pointing to the change in the sedimentation properties of the lysosomes. An increase in "nonprecipitable" activity of the acid RNA-ase in chronic toxic hepatitis served as the sign of injury of the lysosome membranes.
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PMID:[Subcellular distribution of acid hydrolases in rat liver during toxic hepatitis]. 122 45

A total of 102 children aged 5 to 14 years with virus hepatitis B were examined for the status of the mononuclear phagocytic system in accordance with the absolute monocyte count in the circulating blood, esterase and acid phosphatase activity in the monocytes, for function of organ macrophages of the liver and spleen using dynamic scintigraphy with TC-colloid and for macrophages of the skin by the "skin window" method. The rise of the absolute count and lowering of the functional and metabolic activity of blood monocytes were directly proportional to the gravity of virus hepatitis B. The changes persisted for a long time, namely up to 1.5 to 3 months since the disease onset. There was a progressive drop of the functional activity of Kupffer cells in the liver with a maximum decrease seen within 4 to 6 weeks since the disease onset, followed by returning to normal in cyclic disease and preservation of the changes in lingering and chronic virus hepatitis B. Spleen macrophages play an active compensatory role, maintaining normal "purifying" function of the mononuclear phagocytic system. That compensatory response tension appeared high in lingering and especially in chronic virus hepatitis and may serve as a criterion for process chronicity. The changes in the mononuclear phagocytic system observed in cyclic course of mild and medium-gravity virus hepatitis B may be regarded as normal adaptive reaction and do not require any drug correction. The latter one may only be indicated in patients with grave, lingering or chronic disease patterns associated with break down or depletion of the adaptive mechanisms of the system in question.
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PMID:[Functional-metabolic activity of the mononuclear phagocyte system of the blood, liver, spleen and skin in children with hepatitis B]. 225 75

The zonal distribution of enzyme activities was measured by quantitative cytochemistry in cryosections of liver from three normal children and five infants with idiopathic hepatitis of infancy. Optimal conditions for cytochemical reactions were first validated in rat liver and subsequently used in human livers to quantify zonal activities of acid phosphatase (AP), succinate dehydrogenase (SDH), glutamate dehydrogenase (GDH), glucose-6-phosphatase (G6P) and NADPH-dehydrogenase (ND). In normal rat and human livers, activities were greater for SDH and G6P in periportal and for GDH and ND in perivenular hepatocytes, while AP was evenly distributed along the sinusoids. In five infants with idiopathic hepatitis of infancy (IHI), a similar trend of distribution was observed for the two mitochondrial (SDH and GDH) and the two microsomal (G6P and ND) enzymes, although the distribution gradient was less pronounced than, in normal livers. AP showed a mildly greater periportal than perivenular activity. This preliminary study shows that a similar metabolic zonation exists for these enzymes in human livers as is observed in rats.
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PMID:The application of quantitative cytochemistry to study the acinar distribution of enzymatic activities in human liver biopsy sections. 254 21

Suramin that accumulates in rat liver Kupffer cell lysosomes and inhibits the intralysosomal proteolysis was used to suppress the functional activity of these particles during liver damage (acute CCl4 hepatitis). Polyvinylpyrrolidone that does not disturb protein catabolism in liver lysosomes was employed for reference. According to the characteristic changes in lysosomes induced by suramin (inhibition of acid phosphatase, decrease of the rate of the intralysosomal proteolysis in the liver) and PVP the damaged liver was able to accumulate the lysosomotropic substances under study. Suramin aggravated liver damage and increased the lysosomal labilization, whereas PVP exhibited the protective action. The unfavourable effect of suramin may be linked with the suppression of catabolism of Kupffer cell lysosomes. The data obtained suggest the lack of safety of using the inhibitors of intralysosomal proteolysis in patients with acute hepatitis.
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PMID:[Facilitation of the structural and functional disorders of liver lysosomes in toxic hepatitis due to the suppression of intralysosomal proteolysis]. 389 40

Although a recent Cavalieri d'Oro et al. article correctly concludes that while barrier methods reduce the risk of gonorrhea and HIV, they may be less consistent for other diseases, the review does not include the female condom, the newest method of barrier contraception. Laboratory tests have shown polyurethane, the material of which the new condom is manufactured, to be impermeable to HIV and cytomegalovirus. Similar permeability studies using bacteriophages smaller than hepatitis and HIV show the membrane to be a complete barrier. As such, one may expect polyurethane to be the raw material from which male condoms will be made in the future. One clinical study assessed the prevention of reinfection with Trichomonas vaginalis among 104 women who had sexual intercourse with infected male partners. No woman who used the female condom during every act of sexual intercourse became infected. 14% of nonusers and 14% of inconsistent users were, however, reinfected. A study by Soper et al. found use of the female condom to not be associated with genital trauma. Leeper and Conrardy subjected the female condom and the male condom to the standard ASTM water leak test to find a 0.6% incidence of leakage from pinholes and tears for the female condom compared to 3.5% with the male condom. The risk of semen leakage during actual use as identified by acid phosphatase was 2.7% with the female condom and 8.1% with the male condom. Perfect users of the female condom may expect a 2.6% probability of failure over six months' use. Perfect use, however, reduces the annual risk of acquiring HIV by more than 90% among women who have sexual intercourse twice weekly with an infected male.
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PMID:Barrier methods of contraception. 770 60


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