porphyrias/kukurica siata

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Development of an experimental model for the study of hexachlorobenzene-induced hepatic porphyria in the rat.

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Hexachlorobenzene (HCB) induces hepatic porphyria in rats. Various protocols of repeated cumulative and daily doses of HCB administered for several weeks until porphyria develops have been traditionally used. In order to undertake studies on early biochemical events occurring in HCB-induced

Dose-response relationships in hexachlorobenzene-induced porphyria.

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The rate of development of hexachlorobenzene (HCB)-induced porphyria in female Wistar rats was determined using HCB dosage and porphyrin analysis protocols designed to determine factors which contribute to the delay commonly observed between initial exposure to HCB and the detection of porphyria.

The delay in polyhalogenated aromatic hydrocarbon-induced porphyria: the effect of diet preparation.

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Porphyria development in female Wistar rats has been followed by dosing the animals with hexachlorobenzene (HCB) either dissolved in corn oil or as a solid mixed with the diet. It was found that the corn oil preparation resulted in much faster uptake of HCB into the liver, and much faster

Effect of estradiol on the induction of porphyria by hexachlorobenzene in the rat.

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Hexachlorobenzene (HCB) is porphyrinogenic in adult female but not in male rats. This study aimed to assess the role of 17beta-estradiol in the induction of porphyria by HCB in both sexes by adding or removing the hormone. Groups of intact females, ovariectomized females (Ova), castrated males

Modulation of hexachlorobenzene-induced hepatic porphyria by methyl isobutyl ketone in the rat.

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Potential toxic interaction between hexachlorobenzene (HCB) and methyl isobutyl ketone (MiBK) was investigated using two different schedules of toxicant administration. The first schedule involved simultaneous administration of HCB (50 mg/kg/d, p.o. in 10 ml/kg corn oil at 10.00 a.m. for 5 d/wk) and

Glycogen metabolism and glucose transport in experimental porphyria.

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Hexachlorobenzene (HCB) is a fungicide of well-known porphyrinogenic ability, which induces an experimental porphyria that resembles human porphyria cutanea tarda (PCT) in several animal species. It has been demonstrated that high glucose ingestion prevents porphyria development, and

Enhanced regional expression of glutathione S-transferase P1-1 with colocalized AP-1 and CYP 1A2 induction in chlorobenzene-induced porphyria.

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A distinct, nonfocal expression pattern was observed for glutathione S-transferase P1-1 (rGSTP1-1) in rats exposed to either hexachloro-(HCB) or pentachlorobenzene (PeCB). The nonfocal expression was localized to the centrilobular region with the most intense staining nearest the central vein. A

Response of glucose metabolism enzymes in an acute porphyria model. Role of reactive oxygen species.

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Acute hepatic porphyrias are human metabolic diseases characterized by the accumulation of heme precursors, such as 5-aminolevulinic acid (ALA). The administration of glucose can prevent the symptomatology of these diseases. The aim of this work was to study the relationship between glucose

NTP Toxicology and Carcinogenesis Studies of 1,4-Dichlorobenzene (CAS No. 106-46-7) in F344/N Rats and B6C3F1 Mice (Gavage Studies).

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1,4-Dichlorobenzene is commonly used as a space deodorant in toilets and for moth control. Because of its extensive production and use and the absence of carcinogenicity data, carcinogenesis studies were conducted by administering 1,4-dichlorobenzene (greater than 99% pure) in corn oil by gavage (5

Sex-related difference in hepatic glutathione conjugation of hexachlorobenzene in the rat.

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Hexachlorobenzene (HCB) induces hepatic porphyria and liver cancer in female rats, whereas toxicity is minimal in male rats. HCB is biotransformed to sulfur-containing metabolites originating from conjugation to glutathione (GSH). This study aimed to assess differences in GSH conjugation of HCB

Protoporphyrinogen oxidase as a molecular target for diphenyl ether herbicides.

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Diphenyl ether herbicides induce an accumulation of protoporphyrin IX in plant tissues. By analogy to human porphyria, the accumulation could be attributed to decreased (Mg or Fe)-chelatase or protoporphyrinogen oxidase activities. Possible effects of acifluorfen-methyl on these enzymes were

Persistent liver lesions in rats after a single oral dose of polybrominated biphenyls (firemaster FF-1) and concomitant PBB tissue levels.

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In a preliminary study, 12 male and 12 female weanling Sherman strain rats were given a single dose of 1000 mg polybrominated biphenyls (PBBs) FireMaster FF1 Lot 7042 kg/body weight as a 5% solution in corn oil. Three male and three female weanling rats were given corn oil. One day after dosing PBB

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